Mediterranean Archaeology and Archaeometry
Vol. 22, No 1, (2022), pp. 127-154
Open Access. Online & Print.
www.maajournal.com
DOI: 10.5281/zenodo.6464952
POSSIBLE USES OF DEPAS AMPHIKYPELLON
FROM KÜLLÜOBA IN WESTERN CENTRAL ANATOLIA
THROUGH GC-MS ANALYSIS OF ORGANIC RESIDUES
Murat Türkteki1, İsmail Tarhan2, Hüseyin Kara3 and Yusuf Tuna1
1Bilecik
Şeyh Edebali University, Faculty of Science and Letters, Department of Archaeology
2Selçuk University, Faculty of Science, Department of Biochemistry
3Selçuk University, Faculty of Science, Department of Chemistry
Received: 27/02/2022
Accepted: 10/04/2022
*Corresponding author: Murat Türkteki (muratturkteki@gmail.com)
ABSTRACT
The end of the Early Bronze Age, in other words the EBA III, is one of the significant turning points in the
cultural history of the Anatolian Peninsula. Metal objects that indicate social class differences, advancements
in architecture, and finds that point to connections with distant regions all demonstrate that a political structure began to emerge in Anatolia during this period. Parallel to these developments, especially with the increase in interregional relations, the use of new vessels indicates a novelty in eating and drinking habits. Tankards, bell-shaped cups and depas amphikypellon stand out within this group and are referred to as the new
drinking vessels. In addition to these, it is note-worthy that beakers or goblets, and also container amphorae
started to become widespread. All these types are considered to be associated with new drinking habits, and
the new drink type is suggested to be wine. However, the suggestions proposed regarding the use of these
vessels are not supported by any archaeometric studies until now. In this study, we share results from total
lipid extraction analyses (TLE) performed by gas chromatography-mass spectrometry (GC-MS) on a group of
depa vessels from the archaeological site of Küllüoba located in Eskişehir, Turkey, and re-evaluate at the possible purposes of these vessels. Biomolecules such as fatty acids, salicylic acids, organic acids, hydrocarbons,
n-alkanes, and herbal steroids identified as a result of these analyzes provided the first direct evidence of the
use of fermented products such as wine and herbal analgesics in Early Bronze Age Anatolia. Additionally, we
present the first archaeological data of the period and the region regarding the use of salicylic acid.
KEYWORDS: Depa, organic residue analysis, analgesics, wine, Küllüoba, Bronze Age, feasting, salicylic acid
M. TÜRKTEKİ et al.
128
1. INTRODUCTION
A condensed review of organic residues analysis,
the archaeological/chronological background of the
Küllüoba settlement and the Depas Amphikypellon,
as well as its use, typology and dispersal, is given first
prior to the materials, methods and results.
1.1. Organic Residues
Nutrition and health quality are the basic building
blocks in the struggle for survival of human beings at
individual, biological and social levels. For this reason, the determination of these habits has a great importance in determining the cultural history of human beings. Ceramics made of clay, which are widely
found in the archaeological record, can provide important data about the economies, cultures and traditions of the societies that lived in the past. With the
appropriate analytical techniques, organic residues
(ORs) that are absorbed by ceramics can be analysed
and provide valuable information about daily life,
trade and rituals of communities in the past (BlancoZubiaguirre et al., 2019; Dunne et al., 2019; Pecci et al.,
2018; Roffet-Salque et al., 2017; Koh and Betancourt
2010; Chovanec 2022; Kruegerl et al. 2018; Mayyas
2018; Mayyas et al. 2013 ).
Visible ORs are encrusted deposits that adhere to
the inner or outer surface of a ceramic sample. These
remains can be defined by archaeologists as burn-soot
residues accumulated by heating the ceramics over
fire or as materials used for sealing and adhesive purposes (Roffet-Salque et al., 2017). However, these visible residue types are not common in ceramic samples
and the related remains tend to be contaminated or
removed during the removal and cleaning of such artifacts. Since it is very difficult to clean soil from the
visible ORs on the surface or to remove impurities
that penetrated the sample during excavation, such
residues are not preferred for analyses (Roffet-Salque
et al., 2017). Today, most analyses target absorbed
ORs, which usually derive from original food products stored or processed in unglazed ceramics and
represent an accumulation of a single use or multiple
cooking events over the lifetime of the relevant artifact.
During processes, such as cooking, transfer and
storage, the organic compounds interact with the ceramic structure and are absorbed in the pores on the
walls of the ceramics. In particular, the inorganic porous matrix of unglazed ceramic vessels can provide
a protective environment for the decomposition products and biomolecules of the absorbed organic compounds, and thus they can be preserved for thousands of years. The porous structure of unglazed ceramic vessels allows for deep penetration of the organic compounds, providing strong protection
against the microbial attacks and advanced degradation that may occur due to water seepage in the process in which they are buried (Dudd et al., 1999;
Heron et al., 1991). Lipids appear as the largest group
of ORs found in archaeological ceramics (Rosiak et al.,
2020). Edible oils in the lipid group and especially
fatty acids, which are the major compounds of these
oils, are considered the most important members of
the ORs (Evershed, 2008; Gregg and Slater, 2010; Tite,
1999). It is also possible to determine characteristic
compounds that can directly show the materials from
which they originate and are defined as biomarkers,
in ORs in unglazed ceramics. Succinic, tartaric, malic,
and syringic acid as grape-derived biomarkers; fumaric and citric acid are small molecule minor acids
that are accepted as biomarkers related to alcoholic
fermentation (Barnard et al., 2011; Garnier and
Valamoti, 2016; Jerković et al., 2011; Manzano et al.,
2016). On the other hand, tartaric (Inserra et al., 2015;
Pecci et al., 2017; Zhang et al., 2018) and syringic (Fujii
et al., 2019; Pecci et al., 2017) acids detected in unglazed ceramic artifacts is accepted as the most important biomarker showing that these vessels were
used to transport or store red wine. It should be considered that these mentioned bioactive compounds
may also be present in the soil, and care should be
taken when interpreting the results.
Different compounds for medical purposes rather
than food were also stored or transported in archaeological ceramics. The most well-known of these compounds are terpenoid acid resins (Colombini et al.,
2005; Manzano et al., 2016; Ribechini et al., 2008) and
this resin has been used not only as a waterproofing
material or sealant, but also for purposes such as
medicine, antiseptic or balm in rituals (Colombini et
al., 2005). It is known that salicylic acid has been used
for a long time as an anti-inflammatory or pain reliever. It is mostly found in the leaves and bark of the
willow, and poplar trees (Norn et al., 2009). Salicylic
acid has been known for its medicinal properties since
ancient times (around 4000 years ago), notably early
clay tablets from the Sumerians show that salicylaterich willow leaves were prescribed for rheumatic diseases (Jack, 1997). Both the ancient Egyptians and
Greeks described the use of willow leaves or myrtle
for joint pain or inflammation more than 2,000 years
ago as well as Hippocrates (460-377 BCE) suggested
chewing on willow bark for fever and pain and using
a tea brewed from willow bark for pain during childbirth (Goldberg, 2009).
Biomolecules found in ORs are usually found at
trace levels and cannot be determined and detected
by conventional analytical methods. Therefore, hyphenated chromatographic techniques with mass
spectrometers stand out with their high sensitivity
and molecular identification. Among them, especially
Mediterranean Archaeology and Archaeometry, Vol. 22, No 1, (2022), pp. 127-154
POSSIBLE USES OF DEPAS AMPHIKYPELLON THROUGH GC-MS ANALYSIS OF ORGANIC RESIDUES
gas chromatography-mass spectrometry (GC-MS) has
been successfully used in studies dealing with ORs
from archaeological ceramic samples (BlancoZubiaguirre et al., 2019; Liritzis et al., 2020 ).
The present study describes the molecular composition of ORs from seven depas samples from the site
of Küllüoba using GC-MS. Using this technique the
first physical evidence of the use of salicylic acid in
ancient times is presented in this study.
1.2. Archaeological-Chronological Background
The name early bronze age (EBA) for Western Anatolia is first used with the Troy excavations and this
period dates to the beginning of the 3rd millennium
BC, in parallel with Cilicia, Central and Eastern and
southeastern Anatolia. With the publication of the results of the Tarsus-Gözlükule excavations, we use
classical terminology to describe the EBA phases in
the region, divided into three main phases: EBA I,
EBA II and EBA III (Fidan et al., 2015). According to
Efe, the transition period to the EBA coincides with
the late Chalcolithic period according to the Mesopotamian chronology (Efe and Türkteki, 2011). The following EBA I covers a shorter period of time. EBA II
is divided in two or three sub-phases, and EBA III is
examined in two sub-phases as early and late. The
EBA III coincides with the beginning of the Troy II
settlement according to the western Anatolian chronology, and in this period, a significant change was
experienced in both architecture and pottery traditions in the settlement. The emergence of these innovations for the first time in Tarsus has been decisive
in terms of the chronological correlation of two distant regions. Research on the EBA in Western Anatolia has been going on for a long time. However, the
EBA III, in which many innovations emerged, has not
been adequately researched. In this context, Limantepe on the Aegean coast, apart from Tarsus and Troy,
provided important data in terms of both the understanding of the architectural change and the finds
showing the relations with western Anatolia in this
period (Şahoğlu, 2008; Erkanal and Şahoğlu, 2016).
The early stages of EBA III in Denizli-Beycesultan,
which is an important settlement in terms of EBA, are
not yet fully known (Lloyd and Mellaart, 1962). On
the other hand, EBA III is not represented in
Demircihüyük, which is the only settlement providing long-term information on the EBA chronology of
the inland western Anatolia (Efe, 1988). In terms of
understanding this period in Central Anatolia,
Kültepe, with its long-term chronology, offers new information about the EBA III period, (Kulakoğlu, et al.,
2020). Recently published C14 results in Kültepe not
only contribute to a better dating of the period, but
also provide new data in the context of the beginning
of the international trade network, which is the main
129
element of the period, and western Anatolian relations.
Generally, the 3rd millennium BC is an important
period of change for the Anatolian Peninsula. While
small-scale settlements with simpler social hierarchy
were seen at the beginning of the EB I in Troy I
(Blegen et al., 1950:pl. 436), settlements of largerscales with a more complex socio-economic system
appeared with them in EB II such as in Troy II and
Karataş-Semayük (Blegen et al., 1950, pl. 426; Mellink
and Angel 1966:247, fig.2). Advancements in defense
systems, constructions of monumental structures,
and the separation of residential and public areas indicate a gradually increasing social complexity. For
instance, during this period (IVC Phase), the monumental public structures at Küllüoba were separated
from the other part of the settlement (Efe and Fidan
2008:, fig.3). A similar situation is also observed in
layers IIa-c of Troy (Blegen, Caskey, and Rawson
1951, pl.453-455). During the same period, influences
from Western Anatolia began to be seen in Cilician region of Tarsus, as well. These influences, which manifest in the form of the megaron-shaped structures
(Özyar, 2017), votive pits (Türkteki and Başkurt, 2016;
Türkteki and Türkteki 2021 ) and vessel types such as
the depas-tankard in Tarsus, point to the relations between Northwestern Anatolia and the Cilicia region.
During EBA III settlements, production of goods,
social organization and hierarchical structure change
as well as the intraregional and long-distance trade of
raw metal materials increases (Massa and Palmisano,
2018). As a result, the political view of Anatolia also
changes. The trade route that ran from the Cilicia region to Northwestern Anatolia, and from there to the
islands of the east Aegean, Thrace; with depas presence being a ceramic style feature in Cycladic islands,
Minoan centers and mainland Greece; all of which
have played a significant role in the interregional relations (Efe, 2020, 2007; see also Şahoğlu, 2008;
Broodbank, 2010).
These relations, which intensified especially at the
end of the EBA III, manifest themselves in novelties
such as the widespread use of tin in metallurgy, the
production of metal vessels, the use of potter's wheel
in pottery production techniques (Türkteki, 2013),
and metrology (Rahmstorf, 2006). With the entry of
foreign jewelry, weapons, objects made of semi-precious stones, and vessel types such as Syrian bottles
and goblets to the region, it is possible to trace the
signs of new social classes.
While new production-related classes, such as metallurgists and potters began to emerge, the elites or
rulers who use prestige objects and control both the
region and the trade also became more prominent.
Amongst these prestige objects, a new group of drinking vessels appeared. Within the group, bell-shaped
Mediterranean Archaeology and Archaeometry, Vol. 22, No 1, (2022), pp. 127-154
M. TÜRKTEKİ et al.
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cups, tankards, depa and goblets are among the noteworthy vessel types. Although these vessels were occasionally made of metal, ceramic imitations are primarily found in archaeological record (Türkteki,
2021).
1.3. Depas Amphikypellon: Its Use, Typology,
and Dispersal
The emergence of depas, one of the most diagnostic
pottery forms, is significant in determining the beginning of the EBA III, which is the last phase of the Early
Bronze Age in Western and Central Anatolia. The appearance of this vessel, which was first discovered in
phase IIc of Troy and numbered A45 (Blegen et al.,
1950), is acknowledged as the beginning of the EBA
III in many Western Anatolian settlements. Its examples were initially found during the first excavation
season of Troy. Using Homer’s Iliad as a basis, Henrich Schliemann believed that the depas vessels might
be the two handled drinking cups mentioned in the
book. Schliemann incorrectly named this vessel type
“Depas Amphikypellon” However, though incorrect, it
entered the archaeological literature under this name
(Schliemann, 1874; Schliemann, 1881). In his published study, Spanos states that depas is a Greek word
without an etymology and kypellon could be translated as a drinking vessel.; Thus, according to him, depas amphikypellon roughly means a two handled
drinking cup (Spanos, 1972).
Roughly cylindrical in shape, the depa (plural for
depas, Betancourt 2007) have pointed or flat bottoms
and these vessels cannot stay upright on a flat surface
without support (Figure 1a-Type 1-4; Figure 1b).
However, among the comparably smaller wheelmade examples of, there are those that have flat-bottoms and pedestals (Figure 1a-Type 5,7). In some of
the examples, the body slightly narrows in its middle
section. The two handles, placed symmetrically on
opposite sides, extend from under the rim all the way
to the bottom. The fact that the depa, which have very
fragile handles in terms of static, were produced in
bright burnished and mostly red and gray tones
among the quality ware groups, shows that the ceramic samples of this vessel were produced to imitate
metal samples, at least at the beginning. A discovered
silver depas, which must be a piece of the Trojan
treasure, can be regarded as evidence of this assessment (Sazcı, 2006). For that reason, this type of vessel
is also evaluated to be a prestige object, and is proposed to belong to the elite (Şahoğlu, 2014).
Figure 1a. Typology of depa (After Şahoğlu 2014)
Figure 1b. Whole depa samples from Küllüoba
Mediterranean Archaeology and Archaeometry, Vol. 22, No 1, (2022), pp. 127-154
POSSIBLE USES OF DEPAS AMPHIKYPELLON THROUGH GC-MS ANALYSIS OF ORGANIC RESIDUES
It is stated that examples of depa were recovered
from both funerary and domestic settings (Şahoğlu,
2014), and there are various comments on its intended
use. Parallel with the emergence of this type, the increasing use of tankards, goblets and amphorae
(Türkteki, 2020) indicate that a new drinking culture
has become widespread in this period. Thus, the depa
are mostly associated with wine consumption. Based
on the fact that it is two-handled, this type of vessel,
which is thought to be used in ceremonies where especially the elite participated, is considered to be
passed from hand to hand while the drink inside is
consumed (Eslick, 2009). Also, because the depa usually have pointed bottoms and cannot possibly stay
upright by themselves, the drink inside must be completely consumed by the end of the ceremony. The
discovery of numerous examples, such as in the temple area of Kültepe, supports the theory that these ceremonies were associated with sacred areas (Şahoğlu,
2014).
Another explanation for the use and spread of depa
is that these were private items, and that the elites
who were personally involved in trade carried these
items around with them. According to this hypothesis, the exaggerated handles must be used as the vessel’s attachment points for the purpose of transportation (Şahoğlu, 2014). Therefore, we suggest that the
metal examples primarily belonged to elites while
other classes who tried to copy the elites might have
used their imitations. On the other hand, the fact that
the majority of the depa were found in votive pits
131
brings forward another possibility. This “pit ritual”
involves the intentional burial of feasting remains, intact artefacts, and other items. In EB III, the pits seem
to be connected with public spaces, as seen in Limantepe, Troy, and Kanlıgeçit. Perhaps this ritual was
therefore somehow connected with elites and feasting. Feasting was connected with the consumption of
food and alcoholic beverages by the elite or by the entire community (Kouka, 2011) and in EB III some new
types of drinking vessels such as depa begin to be
used. In order to be thrown into the pit after the rituals, the ceramic examples, which are less costly and
particularly breakable, might have been preferred.
The discovery of numerous depas examples at Troy,
Küllüoba, and Kültepe (Ezer, 2014) shows that the
depa were well-liked and accepted.
Named A45 in Troy, this type of vessel initially appears in phase IIc. The wheel-made examples, however, are first found among the gray-black coated
wares in phase IId (Blegen et al., 1950). Other than
these, red coated ware is the other ware group that
wheel-made depa belong to. Found in quite large
numbers, all examples of this group are mainly from
phase IIg. Unlike other types of depa (Blegen et al.,
1950) one fluted example recovered from phase IIg
has a low pedestal. This type, which is mostly represented by red coated ware in Troy III, as well, is more
elegant and expands relatively wider from the bottom
to the rim during this phase when compared to the
previous ones (Blegen et al., 1951).
Figure 2. Sites mentioned in text and distribution of depa drinking vessels.
Mediterranean Archaeology and Archaeometry, Vol. 22, No 1, (2022), pp. 127-154
M. TÜRKTEKİ et al.
132
The depa, which are discovered from Northern
Syria to Mainland Greece and Bulgaria, play an important role interregional communication. Despite
the fact that this vessel type is widely spread, it also
displays regional variations (Figure 2).
As understood from previous evaluations (Aykurt
& Kaya, 2005; Bittel, 1942; Blegen et al., 1950; ÇalışSazcı, 2007; Spanos, 1972; Spanos and Strommenger,
1993; Podzuweit, 1979; Huot, 1982; Mellink, 1989; Efe,
1988; Hüryılmaz, 1995; Schachner and Schachner
1995) of Anatolian depa on the basis of type and ware,
it can be said that there are five distinct main groups
in terms of geographical regions. These are represented mostly by red and a few gray/black coated
(usually with rim slip below the mouths) examples in
the Northwestern Anatolia region that have cylindrical bodies, flat or everted rims and egg-shaped bottoms; horizontally or vertically grooved examples
(Figure 1-Type 5), also called the Southwestern Anatolian type (Oğuzhanoğlu, 2019b), which are red
coated and have grey paste; and in Central Anatolia,
the examples with an S-profile that have rounded
(Figure 1-Type 4) or flat bottoms; and the depa that
have short bodies and paint decorations (Figure 1Type 6) (Ezer, 2014).
According to new studies carried out in the northern sector of Kültepe, the depa first appears in the
phase VIII in Kültepe, and this phase is dated to the
middle of the 3rd millennium BC (Kulakoğlu et al.,
2020). Along with the characteristic types seen in
Western Anatolia, the short form type unique to central anatolia (Figure 1-Type 6) and very well-known
from Kültepe, is seen together. The emergence of the
depa in Kültepe at a stage that can be considered quite
early, with its distinctive form features, simultaneously with western Anatolia indicates that there may
be different regional production centers in Anatolia
(Şahoğlu, 2014).
Lastly, found in Southwestern Anatolia, Cilicia and
Southeastern Anatolia, there are depa with pedestals
(Figure 1-Type 7). These pedestaled examples, which
were mostly discovered in the tombs of Gedikli, are
considered to be an influence of the regional pottery
on the depas form (Spanos, 1972).
1.4. Küllüoba Settlement and Depas
Amphikypellon
The settlement of Küllüoba is located at the western end of the Sakarya Basin, northeast of the
Eskişehir Province-Seyitgazi District. The geographical area where the settlement was established has
highly fertile agricultural soils throughout its history.
This geographical area is also a natural transportation
route that can provide passage between Central Anatolia and the Marmara region. Founded 930 m above
sea level on a slight elevation on the northern side of
the Kireçkuyusu Creek, which is completely dried up
today, the settlement has an area of 350 x 250 m and
is 10 m above the plain level. The mound, inhabited
uninterruptedly for 1450 years between 3300-1850
BCE, includes all phases of the Early Bronze Age (Figure 3). It is an important settlement that provides information on the city planning of the EBA II as well
as the EBA chronology of Western Anatolia. (Efe and
Türkteki, 2011) (Efe and Fidan, 2008) (Fidan et al.,
2015).
The architecture of the Early EBA III, in which depa
first appeared, is known in Küllüoba only from a few
rows of stone walls that do not yield a complete plan,
in grid-squares AD 18 - AD 19. In grid-square Z 19,
levels of Late EBA II and EBA III are layered on top of
one another. EBA III includes a Late EBA III phase
(Transitional period) with five layers at the top, and
below it an Early EBA III phase with at least three layers. The thickness of the cultural fill that contains both
phases is almost 5 m (Türkteki, 2013).
KÜLLÜOBA
Dates
Periods
Eastern
Cone
13th15th
Cent.AD.
1 st.Cent. BC.
-1 st Cent.AD.
1950 BC.
Islamic Burials
Late Hellenistic
Early Roman
IA
IB
Late EB III
Ubergangsperiod
2200 BC.
2400 BC.
Early EB III
2800 BC.
EB II
3000 BC.
EB I
3200 BC.
Transition to the
EBA
Late Chalcolithic
3300 BC
IIA
IIB
IIC
IID
IIE
IIIA
IIIIB
IIIC
IVA
IVB
IVC
IVD
IVE
IVF
IVG
VA
VB
VC
Western
Cone
1
2
3
4
5
6
Figure 3. Chronology of Küllüoba.
Besides the stratification of the Early EBA III observed in grid square Z 19, other important data come
from the votive pits (Türkteki-Başkurt 2017). Belonging to this period, approximately 200 pits were discovered in the mound. Of these, 80 were identified as
votive pits. Special-purpose vessels, metal objects,
bone idols, and grinding and crushing stones were
found in these pits. Also, we determined that, in some
pits, animals were sacrificed (Gündem 2020:84-85).
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POSSIBLE USES OF DEPAS AMPHIKYPELLON THROUGH GC-MS ANALYSIS OF ORGANIC RESIDUES
Regarding this period, it could be said that the pit tradition was also practiced here, like in all contemporary settlements (Oğuzhanoğlu, 2019a). The majority
of intact depa found in the settlement came from these
pits.
The first depa at Küllüoba are hand-made and
found in phase IIIC, which is the earliest phase of the
EBA III. Of the 9342 hand-made pottery sherds that
have been examined from Küllüoba, 130 pieces were
determined with certainty to be from depas vessels.
Along with Troy, this is the highest number of depas
sherds found in Western Anatolia. Keeping that in
mind, except for certain centers such as Troy,
133
Küllüoba, and Kültepe in Western Anatolia, this type
of vessel, which is not intended for daily use, is represented sometimes with only a single example or not
encountered at all in other settlements. Thus, the high
number of recovered depa indicates that the origin of
this vessel type is in Western Anatolia.
The depa discovered in Küllüoba are mainly produced within the red coated ware group. The application of a rim slip is highly characteristic particularly
in the said ware group. In addition to red coated
ware, it is also represented within gray, plain, and
wash ware.
Figure 4. Photo and drawing of analysed depas samples
2. MATERIAL AND METHODS
2.1. Archaeological depa samples
Seven depas samples of the eleven available artifacts (Figure 4) were selected for OR analysis from
Küllüoba, Turkey, as part of an ongoing excavation
by Bilecik Şeyh Edebali University. The information
of the seven samples collected from the excavation
site are provided in Table 1. After removing c. 0.5 mm
of each sample to avoid contamination from soil and
fingerprints, about a 4 g sample was taken from the
rim and body parts of the artifacts, which were more
likely to contain ORs (Copley et al., 2003; Olsson and
Isaksson, 2008; Charters et al., 1993). The samples
were then ground using an agate mortar and prepared for the total lipid extraction (TLE).
Table 1. Catalogue of analysed depas samples
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M. TÜRKTEKİ et al.
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2.2. Extraction procedures
2.2.1. Acid-catalyzed extraction
Lipid residues have been extracted in many studies
using
chloroform/methanol
or
dichloromethane/methanol mixtures. However, these approaches are effective for the extraction of wax esters
and triglycerides on various archaeological ceramics in
different geographical and burial conditions, but they
are ineffective for the fatty acids in the structure of very
well absorbed ceramic pores (Stern et al., 2000; CorreaAscencio and Evershed, 2014; Hammann et al., 2020) ,
and only measurable amounts of fatty acids can be
extracted from a very limited number of ceramics with
these methods (Papakosta et al., 2015b). One-step, acidcatalyzed, direct extraction-methylation method, relatively high efficiency for the extraction of low levels of
lipid residues in unglazed ceramic artifacts, especially
from Southeast Europe and the Middle East, including
Turkey (ORs could be detected in approximately 30%
of the total samples) appears as an alternative
(Papakosta et al., 2015b) and has recently been successfully applied by many researchers examining lipid residues in unglazed ceramics (Leclerc et al., 2018; Mileto
et al., 2017; Oras et al., 2017; Papakosta et al., 2015b,
2019). This method, which consists of a one-step extraction for the lipid residues, was used for the ceramics in
this study due to its advantages.
Lipid residues were extracted and methylated, following the protocol as described in (Papakosta et al.,
2019) with some modifications. According to the
method, 2 g of cleaned and crushed sample containing 50 μL of n-tetratriacontane (1000 mg/L) added as
internal standard was heated with 6 mL of a mixture
of MeOH and 98% H2SO4 (5:1, v:v) at 70 oC for 4 h and
then cooled, and lipids were extracted with n-hexane
(3 x 2 mL) and separated off after centrifugation (2500
rpm, 3 x 5 min).
2.2.2. Base-catalyzed extraction
Since the method used for the extraction of lipid
residues is not suitable for more polar molecules, such
as wine biomarkers and minor compounds, the
method proposed by Pecci et al., (2013) was used with
minor modifications. According to the method, 2 g of
cleaned and crushed sample was extracted with 1 M
KOH (2 x 4 mL) in water in a bath at 70 oC for 120 min.
After cooling and centrifugation, the supernatant was
acidified until the pH is about 2 with 1 mL of 37% HCl
and then 4 mL of ethyl acetate was added to the supernatant, and vortexed for 2 min. The mixture was
separated by centrifugation (2500 rpm, 2 x 5 min).
2.3. GC-MS Analysis
n-Hexane and ethyl acetate phases collected for residue analysis were dried down under a gentle N2 flow
and further silylated with 100 µL of bis(trimethylsilyl)trifluoroacetamide (BSTFA) with 1% trimethylchlorosilane (TMCS) at 70 oC for 1 h. With the silylation process, it was aimed to decrease the polarity of the
analyte, increase its stability and improve the chromatographic separation (Moldoveanu and David, 2019). The
extract was dissolved in 100 µL of n-hexane, and filtered
through a polytetrafluoroethylene (PTFE) filter and analysed in the GC-MS system. The Agilent (CA, USA)
7890N-5975C GC system was employed consisting of an
MS detector and thermostated column oven. The operating conditions of the GC-MS system equipped with
Agilent (CA, USA) HP-5MS capillary column (30m x
0.25mm x 0.25μm, (5%-phenyl)-methylpolysiloxane)
were as follows: The temperature program of the column oven was held at 50oC for 1 min, then increased at
5 oC/min from 50 oC to 300 oC, and held at 300 oC for 9
min. The temperature of the injection block was 300 oC;
the carrier gas was helium; the flow rate was 0.7
mL/min. The injection volume was 5.0 μL on splitless
mode; the electron ionization mode of MS was 70 eV.
The temperatures of source and quadrupole in MS block
were 230 oC and 150 oC, respectively. The MS was set to
the scan mode between m/z 40 and 650, with a scan rate
of 1.24 per second. Selected ion monitoring (SIM) mode
of the MS was used only for salicylic acid compound,
using the ratios of 45, 73, 74, 75, 91, 135, 267, and 268 m/z
belonging to bis(trimethylsilyl) derivative of salicylic
acid. The first 10 minutes each of analysis were defined
as the solvent delay time. A blank was performed for
each sample using the same protocols, taking great care
in order to detect attempts for experimental errors and
to avoid misinterpretations. Chromatographic peaks belonging to the sample and similarities to the blank were
carefully eliminated. Analyses were performed in triplicates and results were given with standard deviations
(SDs). The m/z ratios of the chromatographically separated compounds were automatically compared by the
MS library data, and the relevant compounds were
identified. Compounds identified with a 90% or greater
match with the MS library were considered. While the
compounds determined with 80-89% match were carefully evaluated, matches below 80% were not considered.
3. RESULTS
3.1. Acid-catalyzed extraction
Fatty acids are washed away from the ceramic
pores to a negligible extent thanks to their hydrophobic structure when they come into contact with water
during the burial or post-excavation processes, and
these properties make the fatty acids very durable
and resistant to environmental factors. In addition,
very low levels of fatty acids can be successfully detected with the GC-MS technique. Compared with
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POSSIBLE USES OF DEPAS AMPHIKYPELLON THROUGH GC-MS ANALYSIS OF ORGANIC RESIDUES
other groups of ORs, especially proteins and carbohydrates, fatty acids stand out for their specific stability
(Rosiak et al., 2020). It is known that long chain and
unsaturated fatty acids are the most sensitive organic
compounds to oxidation (Eerkens, 2005). In addition,
the long chain fatty acids with more than 18 carbon
numbers and short chain fatty acids with less than 14
oxidize faster than medium chain fatty acids (C14C18) (Eerkens, 2007). As a result of many studies, palmitic and stearic fatty acids are the most frequently
135
detected fatty acid types in lipid residues in unglazed
ceramics due to their stable structure. While the fatty
acid and/or related lipid building block molecule ratios in archaeological ceramics obtained by GC-MS
cannot provide precise information about the original
fatty acid composition due to unpredictable degradation rates, they allow some general interpretations between different food origins due to the varying ratios
of certain fatty acids. (Eerkens, 2007).
Table 2. The lipid concentration of seven depa obtained by GC-MS analysis
Figure 5. The chromatogram of the composition of D7 obtained as a result of acid-catalyzed extraction.
Table 2 presents the lipid concentration of the
seven depa samples obtained by the GC-MS analysis.
Lipid residues were detected in all ceramics and onestep, acid-catalyzed, direct extraction-methylation
method utilized was found to be a useful approach
for TLE of ORs from archaeological ceramics. The
amount of the extracted lipid was calculated using the
added internal standard. Lipid concentrations well
above 5 µg/g were obtained from all ceramics, sufficient to make reliable interpretations (Evershed et al.,
2008; Reber et al., 2019). This result shows that the examined ceramics have been exposed to a relatively
good preservation period in terms of ORs.
The fatty acid composition of the ceramics is given
in Table 3. The results show that palmitic and stearic
acids were predominant in the ceramics, with average
percentages of 28.34% and 53.16%. The composition
of palmitic and stearic fatty acids varied from varied
from 7.99% (D8) to 54.63% (D13) and 37.21% (D13) to
80.12 (D11) for palmitic and stearic acids. The total ratio of saturated fatty acids (SFAs) and total ratio of
monounsaturated fatty acids (MUFAs) be highest in
D12 (99.97%) and D7 (2.93%), respectively.
ORs in archaeological artifacts are exposed to severe decay conditions over long periods of time. As it
is known, the degradation process of fatty acids first
starts from double bonds because they have electron
density. On the contrary, SFA, which do not contain
double bonds, are more stable and most resistant to
degradation. When the results in Table 3 are examined, it is seen that most of the fatty acids detected in
this study are also SFA, with similar to archaeological
ceramics. Only palmitoleic and oleic acids were identified as MUFA structures in some samples. On the
other hand, 1-Nonadecene was observed as a monounsaturated hydrocarbon molecule. No fatty acids
were detected for the total ratio of polyunsaturated
fatty acids (PUFA) formation. The chromatogram of
the fatty acid composition of D7 is given in Figure 5.
The chromatograms of other ceramics are given in
Supplementary Material (at the end).
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M. TÜRKTEKİ et al.
136
Table 3. The organic residue compositions of ceramics obtained as a result of acid-catalyzed extraction
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POSSIBLE USES OF DEPAS AMPHIKYPELLON THROUGH GC-MS ANALYSIS OF ORGANIC RESIDUES
Using the fatty acid ratios, very useful interpretations can be made about the lipid residue examined.
However, it is known that fatty acids can be formed
due to bacteriological deterioration under anaerobic
conditions. For this reason, it is necessary to pay attention to other fatty acids and minor compounds,
which can impact the interpretations. Ruminant fats
can also be distinguished from non-ruminant fats
based on the proportions of certain fatty acids. If the
stearic acid of the sample is lower than the palmitic
acid and especially fatty acids such as pentadecanoic
acid, and margaric acid and also oleic acid isomers are
present, it has been proposed that the investigated
residue may be a dairy product derived from a ruminant animal (Regert, 2011). When Table 3 is examined,
it is seen that D1 contains that fatty acid distribution.
The fatty acids with odd carbon number are determined in all ceramics, excluding D11 in Table 3. The
presence of these fatty acids may also indicate a decomposition for ruminant fat (Evershed et al., 1997).
It is known that azelaic and palmitic acid can be
formed from oleic acid due to bacteriological deterioration under anaerobic conditions (Kimpe et al.,
2002). Especially azelaic acid probably indicates the
former presence of unsaturated fatty acids with a
double bond at the ninth carbon position in the original fatty acids (Hudlicky, 1990), such as oleic acid. Table 3 shows that analysed samples comply with this
interpretation and most of them contain azelaic and
oleic acid together.
On the other hand, the identification of natural
waxes (n-alkanes) provided key indications for the
presence of leafy vegetables (Eerkens, 2005) (Kimpe et
al., 2002). Tetradecane, hexadecane, heptadecane, octadecane, eicosane, docosane, tricosane, tetracosane,
and pentacosane were the waxes detected in D1, D7,
137
D8, D11, and D13 (Table 3). These saturated hydrocarbons concentrated in D7 and D11 at 11.61% and
6.94%, respectively. This result suggests that leafy
vegetables or food products containing high levels of
wax may have been processed in these examined ceramics. Another organic structure, the compound 14β-H-pregna, was detected in D7. This biomolecule is
an herbal steroid found in the essential oils and different parts of some plants, including Urginea indica
Kunth, Allium rotundum, Gundelia tournefortii L, Citrus
limon, and Cenchrus biflorus and displays antibacterial
activity (Zahra et al., 2019).
When a general evaluation is made, it can be said
that the lipid residues in the ceramics analysed according to the fatty acid composition results obtained
through GC-MS were of both animal and plant origin.
3.2. Base-catalyzed extraction
The organic acids residue composition of the seven
depa samples obtained by GC-MS analysis is given in
Table 4. Benzoic, caprylic, capric, and phthalic acids
were found as organic acids present in all samples,
varied from 0.59% (D1) to 3.98% (D8), 1.00% (D1) to
4.84% (D8), 0.37 (D13) to 3.08% (D4), and 14.71 (D1) to
3.16 (D12) respectively. Caproic, acetic, oxalic, succinic, pelargonic, glutaric, lauric, and cis-aconitic acids were residues seen in at least 50% of all samples
in Table 4. The chromatogram of the composition of
D4 is given in Figure 6. No labels were added to the
peaks of compounds with an MS match of less than
80%. Peaks that were found to be impurities by blank
tests were labeled. The chromatograms of other samples are given in Supplementary Material. Benzoic
acid is one of the grape-related or alcoholic fermentation-related product markers detected in most archaeological ceramics (Fujii et al., 2019).
Figure 6. The chromatogram of the composition of D4 obtained as a result of base-catalyzed extraction.
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M. TÜRKTEKİ et al.
138
Figure 7. The chromatograms of the organic acids obtained as a result of base-catalyzed extraction by SIM analysis
Other markers from these detected in the analysed
ceramics were pyruvic (Garnier and Valamoti, 2016),
acetic (Zhang et al., 2018), succinic (BlancoZubiaguirre et al., 2019; Fujii et al., 2019; Garnier and
Valamoti, 2016; Pecci et al., 2017; Zhang et al., 2018),
glutaric (Fujii et al., 2019), malonic (Pecci et al., 2017),
and citric acids (Blanco-Zubiaguirre et al., 2019;
Manzano et al., 2016; Zhang et al., 2018). When the results in Table 4 are examined, it is seen that especially
D1, D4, D7, and D11 contain most of the detected fermentation-related markers. Tartaric (T. Zhang et al.,
2018) and syringic acids (Fujii et al., 2019; Pecci et al.,
2017), which are accepted as biomarkers of red wine,
were not detected. Also, we detected 2-Ethylhexanol,
which is found naturally in alcoholic beverages in D1.
Therefore, these results indicate that most of these ceramics probably contained wine or different fermented products. Another alcoholic fermentation-related product in ceramics is oxalic acid, possibly derived from calcium oxalate, a byproduct of malt wine,
and this was also direct evidence of beer's earliest origins (Zhang et al., 2018). For this reason, especially
D1, D4, D8, D11, D12, and D13 may also have been
used for this purpose.
In addition, a variety of low-molecular weight aliphatic carboxylic acids such as, butyric, valeric, caproic, adipic, enanthic, pimelic, valproic, pelargonic,
azelaic, and lauric and medium-molecular weight aliphatic carboxylic acids such as myristic, palmitic,
and stearic acids are also shown in Table 4. Glycerol
was also detected as triglyceride degradation products in D1. The samples D7 and D8 contain verbenone, which is naturally found in lavender (Özel,
2019) and pine resin (Jerković et al., 2011) in Table 4,
which may be a potential biomarker for consumption
of these plants.
As a first time for the analysis of ORs in archaeological ceramics, 0.79% and 0.56% free salicylic acids
were detected in D4 and D12, respectively. As mentioned in the introduction, written archaeological
sources indicate that salicylic acid has been used since
ancient times. However, a study containing physical
data on the use of salicylic acid in the past has not
been presented to date. For this reason, the base-catalyzed extraction was performed for D4, and D12 and
the obtained extracts were analysed by GC-MS device
in SIM mode with m/z ratios selected for free salicylic
acid. The chromatograms obtained as a result of SIM
analysis are given in Figure 7.
As seen in Figure 5, free salicylic acid peak detected
in D4 and D12 intersects. The salicylic acid peak of
both samples was 100% confirmed by MS library in
the SIM mode. This result shows that the salicylic acid
detected in D4 and D12 is in free form. It is important
to determine whether the detected salicylic acid is a
product that is absorbed during use of the relevant ceramic or is a product formed during the burial process. It is known that eukaryotic and prokaryotic cells
including plants can produce salicylic acid as a secondary metabolite (Lefevere et al., 2020). In addition
to being synthesized from Phe via cinnamic acid by
plants (Dempsey et al., 2011), salicylic acid can also be
synthesized by some bacteria by isochorismate pathway (Wildermuth et al., 2001). Although salicylic acid
can be synthesized in different species, it is known
that most of the active salicylic acid molecule in plants
is free salicylic acid. (Zhang and Li, 2019). Since the
salicylic acid compounds obtained as a result of the
GC-MS analyzes are also in free form, the salicylic
acid detected in D4 and D12 is thought to be of plant
origin rather than bacteria. Since salicylic acid has the
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POSSIBLE USES OF DEPAS AMPHIKYPELLON THROUGH GC-MS ANALYSIS OF ORGANIC RESIDUES
ability to dissolve in lipids, in contrast with the α-hydroxy acids, it may have been used or stored by mixing with different fats and oils in these analysed ceramics. In the relevant region, the extracts of many
plants, which are believed to have many medicinal
properties, are mixed with lipid products such as milk
and are still consumed traditionally. However, it
139
should be noted that in order to express an assertive
ingredient such as salicylic acid, it is also necessary to
simulate the archaeological situation and to examine
whether it is likely to survive through burial/leaching experiments. For this purpose, a new project will
be started by our research group.
Table 4. The organic residue compositions of ceramics obtained as a result of base-catalyzed extraction
(Results represent peak area percentages)
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M. TÜRKTEKİ et al.
140
4. DISCUSSION
In examples D1, D2, D3 D4, D7, and D11, biomarkers for fermented products were detected. It is
possible for alcohol to be considered as a sort of medicine (McGovern 2019). The earliest example in Southwestern Asia that presents the chemical and archaeobotanical evidence of wine consumption is known
from the Southern Caucasus (McGovern et al., 2017).
Apart from these from the Early Neolithic samples,
other examples obtained from studies regarding tartaric acid analyzes are from Hajji Firuz Tepe in Iran
(McGovern, 2003), and later from level V of Godin
Tepe, dated to 3500-3100 BCE (McGovern, 2009). The
earliest data on wine in Anatolia are in written
sources recovered from the Assyrian Trade Colonies
period at Kültepe (Kanesh) (Barjamovic, 2011). According to the written sources, wine was imported
here from Mamma, Tegarama, Urshu and Unibgum,
which are known for their sweet wines (Barjamovic,
2011). They also state that there was wine production
in the region (Corti, 2017). There are also written documents on wine-making and its consumption from
the Old Hittite period (Corti, 2017). During the Hittite
period, beer consumption had an important place in
ceremonies and religious rites (Brown, 2018). Important analysed samples about ceremonies with
wine, beer and mead comes from the Phrygian capital
of Gordion (McGovern 1999). Most of the other data
on wine consumption is based on archaeobotanical
remains (Zettler, R.F; Miller, 1996). The Küllüoba
depa are the first to be chemically analysed in Anatolia and the yielded data partially supports previously
proposed uses for this vessel type.
Salicylic acid detected in examples D4 and D12 is
the first ingredient to be discovered in such vessels
until today. It is considered that herbal medicines, analgesics, narcotic substances, and various drinks may
be used in connection with ceremonies and rituals
since prehistoric times (Samorini, 2019). Although
there is very little data available from Southwestern
Asia, one of the most significant information on
plants that can be used for herbal medicine or analgesic comes from the kitchen area of the Ebla G Palace
in Northern Syria, which is contemporary with the
period in which the depa were in use. (Peyronel et al.,
2014). Wheat, barley, legumes, olives, grapes, and
some wild plant residues were found in this area, particularly in the "kitchen room" no L.2890. Euphorbia
discovered among the wild plant residues and its areas of use point to the possibility that the drink detected inside the Küllüoba depa that contained salicylic acid, in other words willow bark, could have
been used similarly in ceremonies and rituals. No
written records were found regarding the use of these
plants (Peyronel et al., 2014), but there are texts on the
preparation of medicine (Fronzaroli, 1998). There is
no example found in Anatolia that can be compared
with this example yet. However, it is known that also
afterwards, in the Hittite period, willow bark was
used in medicinal preparations (Şahinbaş, 1995).
5. CONCLUSIONS
The new vessel forms that emerged during the EBA
III period were previously associated with a new
drinking culture and feasts. We argue that depas were
used in ceremonies involving wine consumption conducted by the elite (Çalış-Sazcı, 2002). This study reveals the first archaeological evidence for the actual
use of the depas form beyond theory. Results clearly
reveal that there are fermented products in the depa.
The results of the study, together with both the context and other related data, explain the role of these
vessels in the pit ritual (Warner, 1994; Kouka, 2011;
Blegen et al., 1950; Mellink, 1989; Özdoğan and
Parzinger, 2012; Oğuzhanoğlu, 2019a; Türkteki and
Başkurt, 2016). Both at Küllüoba and in settlements
where depa have been discovered, the majority of the
examples came from these pits, which also contained
other special finds. We assert with certainty that alcoholic beverages were consumed in these ceremonies,
as was thought before. This substance can be used
mixed with alcoholic products, or it can be consumed
by mixing with other herbs. In some depa samples,
herbal steroids with antibacterial properties were also
found, indicating that leafy plants were consumed. In
addition, pythalic acid residues that are likely to belong to medicinal aromatic plants can also be evaluated in the same context. Samples of Erysimum crassipes preserved in a jar were unearthed in Küllüoba
excavations (Çizer, 2015). This data shows that different groups of Erysimum species have been used in the
field of medicine and that such plants are especially
kept in the settlements.
In the context of all these evaluations, the question
to be asked here is whether the use of these substances
was part of a ceremony for the treatment of a disease
or whether the ritual performed was a celebration. On
the other hand, the soothing effect of wine or other
alcoholic beverages should not be ignored. In this respect, it should be considered that the purpose of the
ceremony, which ends with the pit ritual, may not always be a celebration. In this context, considering that
some of the pits unearthed in Laodicea-Kandilkırı
and Karataş-Semayük may be related to the cemetery
(Oğuzhanoğlu, 2019a) (Warner, 1994), it is also possible that these substances were used in a post-mortem
ceremony to ease the sadness and pain. Although different data are needed to answer this question, it
would be appropriate to consider future studies from
this perspective.
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POSSIBLE USES OF DEPAS AMPHIKYPELLON THROUGH GC-MS ANALYSIS OF ORGANIC RESIDUES
141
AUTHOR CONTRIBUTIONS
Conceptualization and methodology: Murat Türkteki and İsmail Tarhan, formal analysis: İsmail Tarhan and
Hüseyin Kara, software: İsmail Tarhan and Hüseyin Kara, writing -original draft preparation: Murat Türkteki and
İsmail Tarhan, resources: Hüseyin Kara, data curation: İsmail Tarhan, writing-review and editing: Murat Türkteki,
visualization: Yusuf Tuna, project administration: Murat Türkteki, funding acquisition: Murat Türkteki and İsmail
Tarhan.
ACKNOWLEDGEMENTS
We thank the anonymous reviewers for their constructive comments. The authors are grateful to the Scientific
Research Projects Foundation of Selçuk University for the financial support of this work. The authors are also
grateful to Bilecik Şeyh Edebali University Research Foundation for supporting Küllüoba Excavation project
no 2021-02.BŞEÜ.04-02 and 2018-01.BŞEÜ.04-06.
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