2011 Boletn Latinoamericano y del Caribe de Plantas Medicinales y Aromticas 10 (5): 470 - 475
ISSN 0717 7917
www.blacpma.usach.ch
Artculo Original | Original Article 470
Insecticidal Effect of Schinus latifolius Essential Oil on the Housefly, Musca domestica L.
[Efecto Insecticida del Aceite Esencial de Schinus latifolius en Mosca Domstica, Musca domestica]
Alejandro URZA 1 , Dania DI COSMO 1 , Javier ECHEVERRA 1 , Roco SANTANDER 2 , Sara M. PALACIOS 3 & Yanina ROSSI 3
1 Laboratory of Chemical Ecology, Faculty of Chemistry and Biology, Universidad de Santiago de Chile, Casilla 40, Correo 33, Santiago, Chile. 2 Meat Laboratory, Technological Faculty, Universidad de Santiago de Chile, Casilla 40, Correo 33, Santiago, Chile. 3 Laboratory of Fine Chemicals and Natural Products, Faculty of Chemical Sciences. Catholic University of Crdoba, Camino a Alta Gracia Km 10, (5000) Crdoba, Argentina. Contactos | Contacts: Alejandro URZA E-mail address: alejandro.urzua@usach.cl
Abstract The composition of essential oil (EO) from Schinus latifolius obtained by hydro distillation of dry leaves was analyzed using gas chromatography (GC-FID) and gas chromatography/mass spectroscopy (GC/MS). The insecticidal effect of the oil on the house fly Musca domestica was evaluated by placing flies in a sealed glass jar containing a piece of EO-treated cotton yarn. The dose necessary to kill 50% of flies (LC50) in 0.5 and 1 h was determined at 261C. The essential oil from Schinus latifolius showed significant insecticidal properties [LC50 = 31.98 mg/dm 3 (0.5 h) and LC50 = 19.20 mg/dm 3 (1 h)]. According to GC-FID and GC/MS analysis a total of 54 compounds were identified accounting for 99.45% of the EO, with limonene (50.23%); -pinene (15.01%); - pinene (11.81%); sabinene (4.71%) and -thujene (2.18%) as the main components. The EO from Schinus latifolius appears promising as a natural insecticide against houseflies. The composition of the Schinus latifolius essential oil reported in this study is different to that reported in other publications. The most important characteristic is the high content of limonene (50.23%), which can be attributed to the time of year and the geographic location of the sampled plants.
Resumen La composicin del aceite esencial (AE), obtenido por hidrodestilacin de hojas secas de Schinus latifolius se analiz mediante cromatografa de gases (CG- FID) y cromatografa de gases / espectrometra de masas (CG/EM). La actividad insecticida del aceite contra la mosca domstica, Musca domestica se evalu colocando las moscas en un frasco de vidrio sellado con un trozo de hilo de algodn tratado con diferentes cantidades de AE. La dosis necesaria para matar el 50% de las moscas (LC50) en 0,5 y 1 hora se determin a 26 1C. El aceite esencial de Schinus latifolius mostr un buen efecto insecticida [DL50 = 31,98 mg/dm 3 (0,5 h) y DL50 = 19,20 mg/dm 3 (1 h)]. De acuerdo con los anlisis de GC-FID y CG/EM, un total de 54 compuestos fueron identificados lo que representa el 99.45% del AE, siendo limoneno (50.23%); -pineno (15.01%); -pineno (11.81%); sabineno (4.71%) y -tujeno (2.18%) los componentes principales del AE. El AE de Schinus latifolius parece prometedor como un insecticida natural contra la mosca domstica. La composicin del aceite esencial de Schinus latifolius encontrado en este trabajo es diferente al informado en otras publicaciones. La caracterstica mas importante es el alto contenido de limoneno (50.23%), que podra atribuirse a la poca del ao y la ubicacin geogrfica de las plantas recolectadas.
Palabras Clave: Musca domestica; Schinus latifolius; composicin del aceite esencial; insecticida natural; efecto antagnico entre monoterpenos
Recibido | Received: 20 de Agosto de 2011. Aceptado en versin corregida | Accepted in revised form: 26 de Agosto de 2011. Publicado en lnea | Published online: 30 de Septiembre de 2011. Declaracin de intereses | Declaration of interests: Financial support for this work was provided by Universidad de Santiago de Chile (USACH), DICYT, 020941UM and FONDEF D08I1102. Este artculo puede ser citado como / This article must be cited as: Alejandro Urza, Dania Di Cosmo, Javier Echeverra, Roco Santander, Sara M. Palacios, Yanina Rossi. 2011 Insecticidal Effect of Schinus latifolius Essential Oil on the Housefly, Musca domestica L. Bol Latinoam Caribe Plant Med Aromat 10(5): 470 475. Urza et al Insecticidal effect of Schinus latifolius essential oil on the housefly
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INTRODUCTION Musca domestica L. (Diptera: Muscidae) is one of the most common insects associated with man. Flies are mechanical vectors of several human and animal diseases (Malik at al., 2007). Many insecticides have been used for housefly control, however, their use can affect human health, agricultural ecosystems and the environment in general (Reed, 2002). In addition, houseflies develop resistance to insecticides and one of the major mechanisms of resistance is a change in the target site (Kozaki et al., 2009). Integrated pest management programs (IPM) appear to be a good alternative for the control of house flies. These programs combine different control methods that include the use of botanical insecticides (Tripathi et al., 1973; Malik et al., 2007). Among botanical insecticides, plant essential oils (or their components) have been evaluated as they show a broad spectrum of biological activity including toxicity, repellant, oviposition and feeding deterrence (Isman, 2001; Isman
and Machial, 2006; Batish et al., 2008; Rosell et al., 2008; Palacios et al., 2009a; Kumar et al., 2011). In our continuing interest in the potential of essential oils (EO's) from Chilean flora as insecticides against Musca domestica (Urza et al., 2010a; Urza et al., 2010b ), we present an evaluation of the insecticidal property of a widespread species endemic to Central Chile, Schinus latifolius ( Gilles ex Lindl.) Engler, (Riedeman and Aldunate, 2001). In addition to being a medicinal plant with antiseptic properties (Muoz et al., 1981), a key factor in its selection was that the citrus-scented leaves of S. latifolius are used to repel insects and that the EO extracted from leaves of the close Schinus molle L. is a well known house fly repellent (Wimalaratne et al., 1996) with proven insecticidal properties (Palacios et al., 2009a).
EXPERIMENTAL General Limonene; -pinene; -pinene; bornyl acetate; - terpineol; 4-terpineol; 1-octanol and octanoic acid were purchased from Sigma-Aldrich (St. Louis, MO, USA). Dimethyl-2,2-dichlorovinyl phosphate (DDVP) was provided as a gift by Professor H. Masuh from the Center of Investigation on Pests and Insecticides, CONICET, Argentina. The essential oil component analysis was performed using gas chromatography (GC-FID) and gas chromatography/mass spectroscopy (GC/MS). Qualitative analysis was performed using a Thermo Scientific Trace GC Ultra linked to a ISQ quadrupole mass spectrometric detector with an integrated data system (Xcalibur 2.0, Thermo Fisher Scientific Inc. USA); quantitative analysis was carried out using a Shimadzu GC-9A gas chromatograph fitted with a FID-9 detector (Shimadzu Corporation, Kyoto, Japan). The same capillary column (Rtx-5MS, film thickness 0.25 m, 60m x 0.25 mm, Restek Corporation, Bellefonte, PA. USA) was used in both instruments.
Plant material Leaves of Schinus latifolius were collected from Huaqun del Mar (V Regin, Chile, 32 18 49.57S, 71 28 16.03W) at an altitude of 35 m over the average sea level during the flowering season, November 2010. Voucher specimens were deposited in the Herbarium of the National Natural History Museum, Santiago, Chile. The leaves were dried in an oven with circulating air at 40 C for 24 h.
Essential oil extraction and analysis Essential oil was extracted from 387 g of dry milled leaves for 4 h by hydro distillation (2.5 L, H 2 O) in a Clevenger-type apparatus. The EO was dried over anhydrous sodium sulfate. The EO component analysis was performed by gas chromatography (GC- FID) and gas chromatography/mass spectroscopy (GC/MS) using the instrumentation described above. The operating conditions were as follows: on-column injection; injector temperature, 250 C; detector temperature, 280 C; carrier gas, He at 1.25 ml/min; oven temperature program: 40 C for 5 min, increase to 260 C at 5 C/min, and then 260 C for 5 min. The mass detector ionization employed an electron impact of 70 eV. Recording conditions employed a scan time of 1.5 s and a mass range of 40 to 400 amu. Compounds in the chromatograms were identified by comparison of their mass spectra with those in the NIST08 library database, and by comparison of their retention index with those reported in the literature (Adams, 2007), for the same type of column or those of commercial standards, when available.
Fly collection and maintenance The colonies of M. domestica used in this study originated from adults collected in the experimental field of the Universidad Catlica of Crdoba, in Urza et al Insecticidal effect of Schinus latifolius essential oil on the housefly
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Crdoba, Argentina, using a sweep net. The flies were transferred to a small cage and then reared in entomological cages (303030 cm) at 26 1 C under a 12:12 light: dark cycle and 70% humidity. Adult flies were provided with water and fed a 1:1 (v/v; approximately) mixture of granulated sugar and powdered milk. Bran and milk were prepared at a weight ratio of 1:3 and 100 g of this mixture was placed on a plastic plate as an oviposition site.
Bioassay The bioassay was designed so the flies would have high probability of coming into contact with volatile compounds within the one hour test period; therefore, the flies were allowed access to the total space within the exposure vessel. Ten 4-5 day old adult house flies, of both sexes, were placed in a glass jar (1.2 dm 3 ) fitted with a screw cap that had a 7-cm length of cotton yarn suspended from the center of its inner face. Different dosages of pure EO (without solvent) were applied to the yarn. The control vessel had no compound on the cotton yarn. The jars were sealed tightly and maintained at temperature of 26 1 C. Each test was repeated three times. The assay was also conducted with the cotton yarn enclosed in a breathable cloth bag to prevent direct contact. Dimethyl 2,2-dichlorovinyl phosphate (DDVP), a volatile organophosphate, was used as a positive control. Mortality in each group was assessed after one hour of exposure.
Data analysis The mean mortality data of the three repeated assays per dose (4-6 doses) was used to calculate the LC 50 . Probit analysis (Harvard Programming; Hg1, 2) was used to analyze the dose-mortality response.
RESULTS AND DISCUSSION From the dry leaves of S. latifolius (387g), 1.33 g (0.34%) of EO was obtained. The composition of the EO is listed in Table 1. Limonene (50.23%)(1); - pinene (15.01%)(2); -pinene (11.81%)(3); sabinene (4.71%)(4) and -thujene (2.18%)(5) were the principal components of S. latifolius EO.
Table 1: Composition of the essential oil of leaves of Schinus latifolius.
Compound RI % Identification Compound RI % Identification 2-Hexanal 860 0,05 RI, MS 5-Methyl-3-hexen-2- one 1334 0,08 RI, MS Tricyclene 929 0,20 RI, MS -Copaene 1394 0,44 RI, MS -Thujene (5) 934 2,18 RI, MS Decyl acetate 1412 0,22 RI, MS -Pinene (2) 943 15,01 RI, MS, Co-I Dodecanal 1414 0,13 RI, MS Camphene (7) 958 1,16 RI, MS (E)-Caryophyllene 1445 0,10 RI, MS Sabinene (4) 982 4,71 RI, MS trans-- Bergamotene 1452 0,05 RI, MS -Pinene (3) 986 11,81 RI, MS, Co-I 2-Dodecenal 1479 0,36 RI, MS -Myrcene 994 0,82 RI, MS Aromadendrene 1487 0,42 RI, MS -3-Carene 1018 0,13 RI, MS Germacrene D 1505 0,29 RI, MS -Terpinene 1024 0,07 RI, MS -Muurolene 1521 0,41 RI, MS -Cimene 1034 1,55 RI, MS NI 1532 0,09 Limonene (1) 1040 50,23 RI, MS, Co-I -Cadinene 1538 0,18 RI, MS -Ocimene 1054 0,09 RI, MS - Cadinene 1544 1,02 RI, MS -Terpinene 1067 0,08 RI, MS -Amorphene 1560 0,06 RI, MS 1-Octanol 1074 0,08 RI, MS, Co-I Elemol 1571 0,06 RI, MS Terpinolene 1096 0,06 RI, MS -Calacorene 1589 0,07 RI, MS NI 1333 0,12 Viridiflorol 1598 0,05 RI, MS trans-Pinocarveol 1154 0,09 RI, MS Spathulenol 1607 0,56 RI, MS Urza et al Insecticidal effect of Schinus latifolius essential oil on the housefly
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Octanoic acid 1174 0,52 RI, MS, Co-I Ledol 1615 0,08 RI, MS 4-Terpineol 1190 1,09 RI, MS, Co-I Guaiol 1623 0,28 RI, MS -Cymen-8-ol 1195 0,05 RI, MS NI 1627 0,24 Myrtenal 1212 0,13 RI, MS Cubenol 1657 0,06 RI, MS NI 1238 0,10 -Eudesmol 1661 0,07 RI, MS Carvone 1259 0,07 RI, MS -Cadinol 1668 0,79 RI, MS 1-Decanol 1276 0,55 RI, MS -Cadinol 1682 1,30 RI, MS 2,5-Dimethyl-2,5- hexanediol 1284 0,23 RI, MS Bulnesol 1695 0,11 RI, MS Bornyl acetate (6) 1299 0,59 RI, MS Guaiol acetate 1704 0,15 RI, MS
RI: Retention index; MS: Mass spectrum; Co-I: standard; NI: not identified.
As far as we can determine, the composition of only two EO samples from Schinus latifolius have been investigated. Barroso et al., 1991, reported as major compounds: -pinene (35%) (3), sabinene (24%) (4) and -pinene (21%) (2) and in the sample studied by Niemeyer and Teiller, 2007, they reported: -pinene (24.2%) (3), bornyl acetate (19.7%) (6), - pinene (16.6%) (2) and camphene (19.7%) (7). The composition of the Schinus latifolius essential oil found in this study is different to that previously reported. The most important differences are the high content of limonene (50.23%) (1) and the low content of sabinene (4), bornyl acetate (6) and camphene (7), which can be attributed to the time of year and the geographic location of the sampled plants (Shoonhoven et al., 2005).
Figure 1: Principal monoterpenoids in the essential oil of Schinus latifolius
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The fumigant effects of EO against adult M. domestica were evaluated by determining the LC 50 values, which are presented in Table 2.
Table 2: LC 50 of Schinus latifolius essential oil on Musca domestica ________________________________________________________ Time (h) Mean LC 50 in mg/dm 3 (95%CI) ________________________________________________________ 0.5 31.98 (10.3498.96) 1 19.20 (7.7147.67) ________________________________________________________ Time: 1 h; t: 26 1 C
The insecticidal properties of some monoterpenoids have been determined using the same bioassay, in which the LC 50 in a 0.5 h experiment was 12.1 mg/dm 3 for -pinene, 6.2 mg/dm 3 for limonene and 6.4 mg/dm 3 for -pinene (Palacios et al., 2009b). The insecticidal properties of an essential oil may be related in principle to its individual components. The proportion of limonene in the S. latifolius EO was 50.23%, which means the LC 50 dose of S. latifolius EO (31.98 mg/dm 3 ) contains approximately 16 mg of limonene. This amount is around 2.6 times higher than the LC 50 of pure limonene (6.4 mg/dm 3 ). These results demonstrate that the insecticidal property of limonene is affected through an antagonistic mechanism probably produced by other major monoterpenes present in the S. latifolius essential oil.
ACKNOWLEDGEMENTS Financial support for this work was provided by Universidad de Santiago de Chile (USACH), DICYT, 020941UM and FONDEF D08I1102
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