Drying and Reconstitution of Cassava Foo Foo: Opara C.C, Akangbou N.M, Evbuomwan B.O, Ogbodo M.N
Drying and Reconstitution of Cassava Foo Foo: Opara C.C, Akangbou N.M, Evbuomwan B.O, Ogbodo M.N
Drying and Reconstitution of Cassava Foo Foo: Opara C.C, Akangbou N.M, Evbuomwan B.O, Ogbodo M.N
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Drying and Reconstitution of Cassava Foo Foo
and 45C respectively before fermentation took place. The IV. RESULTS AND DISCUSSION
softened tubers were mashed with the hands and washed over
a sieve placed on top a basin. The slurry obtained was allowed
to settle. The clear liquid above the pulp was removed; further
removed of liquid was accomplished by subjecting the pulp
under high press. The fleshing fermented cassava pulp was
dissolved completely in little quantity of water and poured in
a pot placed on a 1000w electric stove. The mixture was
stirred continuously for about 25 minutes, a thermometer was
inserted in the cooking pot to note the temperature and time
interval was also noted with the help of stopwatch. This
cassava foo foo was then used for experiment.
A. Drying Method:
Figure: 1 Effect of drying rate of cassava foo foowith time.
The dryer used in this experiment was solar dryer; the weight
of the weighing pan was measured and noted with a triple
beam balance. Thereafter, the cassava foo foo was prepared
for drying using the principle of thin-film drying. The cassava
foo foo was spread across each of the three the weighing pans
with the required thickness placed at the edges and rolled over
with damped rollers to give the required thickness of 1mm
each. The three drying bins were transferred into the drying
chamber of the dryer, and the whole system was mounted
under the sun facing the direction of the suns ray. An
anemometer was mounted beside the dryer and the wind
velocity was determined at one hair intervals. The wet bulb
and dry bulb temperature were determined with a minimum Figure 2: Effect of moisture content with time.
and maximum thermometer. The collector temperature and
drying air temperature were also determined at an interval of
one hour. The weights of the three samples were constantly
checked at one hour interval and recorded from which the
drying rate and the moisture content were calculated. After
solar drying of cassava foo foo was completed, perceptions
were carried out by some individuals on the changes in
physical property of the dried cassava foo foo. Changes were
observed in colour (darkening in colour, harder texture,
shrinkage, case hardenings and reduction in offensive odour
of the cassava foo foo. The experiment is stopped when there
is no more appreciable change in the weight of the sample
with time.
Figure 3: Effect of drying rate of cassava foo foo with
III. RECONSTITUTION OF DRIED CASSAVA FOO FOO: moisture content.
The bore-dry weights of the three samples were used for the
reconstitution experiment using cold and hot water. The RECONSTITUTION GRAPH FOR POWEDERED
bore-dry cassava foo foo sample was grinded into powered CASSAVA FOO FOO USING COLD WATER.
form. The grinded cassava foo foo was then sieved using a
400 mesh size sieve. In the cold water experiment, 30ml (30g)
of distilled water at 24C in temperature was poured in
calibrated test tube, 20mm diameter and 2mm thick
containing 3.7g of the sieved cassava foo foo sample.
Prior of this, the height in millitres of the calibrated test tube
was recorded. After the water was poured; the change in
height of the powered cassava as the water was being
absorbed was recorded at four minutes interval. The change in
height of the water was also recorded at same time interval.
The results were recorded until a point where water was no
longer absorbed. The water above was measured and
decanted. This was repeated, using hot water at 100C. The
experiment is stopped when there is no more appreciable Figure 4: Effect of Absorption rate of cassava foo foo with
change in the weight of the sample with time. moisture content.
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International Journal of Engineering and Technical Research (IJETR)
ISSN: 2321-0869 (O) 2454-4698 (P), Volume-3, Issue-7, July 2015
V. DISCUSSION
Figure1: Effect of drying rate of cassava foo foo with time.
From the graph it can be observed that the drying rate has a
constant period at 4.7 with increase in time from 1-3 hours
before the drying rate decreases with increase in time and
become constant again with increase in time at time (9-10)
indicating there is no further drying.
Figure 2: Effect of moisture constant with time. Drying of
Figure 6: Effect of Absorption rate of cassava foo foo with
cassava foo foo with warm up period of 54.36% to 49.60%
time.
moisture content at time (0-1) hour and decrease with increase
in time interval (0-10) hours. The moisture content
RECONSTITUTIONGRAPH FOR POWEDERED
concentration falls linearly over at time (1-6), time (5-8) show
CASSAVA FOO FOO USING HOT
nonlinear drop of moisture content. The slope of the graph
WATERRECONSTITUTION GRAPH FOR
decreases in magnitude with increasing time and drying rate
POWEDERED CASSAVA FOO FOO USING COLD
progressively diminishes. At time (5-9) represent falling rate
WATER.
periods. The slope of the curve has a discontinuity at time 9
hours. The equilibrium moisture content is reached at the time
9 hours after which the graph becomes flat indicating no
further loss of moisture.
Figure 3: Effect of drying rate of cassava foo foo with
moisture content. Increase in moisture content increases the
drying rate. At moisture content of 49.60% to 54.36%, the
rate of drying is constant at 4.7gram per hour.
Figure 4: Effect of Absorption rate of cassava foo foo with
moisture content. From the graph, it can be observed that
increase in moisture content decreases the absorption rate of
cassava foo foo. The absorption rate of cassava foo foo
reached its peak level at 1.75gram per minutes with moisture
content of 65.42% after which the curve becomes flat
Figure 7: Effect of Absorption rate of cassava foo foo with
indicating no further loss of moisture. Also the graph shows
time.
the reconstitution of dried cassava foo foo using cold water
with constant rate period of absorption rate of (0.86-1.75)and
linear increase in moisture content of 0%-65.42%.
Figure 5: Effect of Absorption rate of cassava foo foo with
moisture content. From the graph, it can be observed that
increase in time decreases the moisture of cassava foo foo.
The moisture content of cassava foo foo reached its peak level
at 65.42% with time at 4 hours after which the curve the
becomes flat indicating no further loss of moisture. Also the
graph shows the reconstitution of dried cassava foo foo using
cold water with initial increase in moisture content of 65.42%
with falling rate period (1.75-0.25) and it decreases linearly
with increase in time (4-10) minutes.
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Drying and Reconstitution of Cassava Foo Foo
Figure 6: Effect of Absorption rate of cassva foofoo with [3] Da-Wen, S. (2007): Computational Fluid Dynamics in Food
Processing CRC Press, Taylor and Francis Group. Page 251
time. It can be observed that in the early hour there was a
[4] Federal Industrial Research (2005) cassava processing FIRO, Oshodi,
sharp rise in absorption rate of cassava foo foo and sudden Lagos, Nigeria.
later hour sloppy collapse. The increase in time decreases the
absorption rate. Also the graph shows the reconstitution of [5] Lucas E.B. and Olayanju, T.M.A., (2003): Effect of Moisture
dried cassava foo foo using cold water with initial Content on some physical properties of Beni seed Accession. Journal
of Applied Science and Technology. Volume 3, Number 1. Page 7-12.
reconstitution of 1.75 and constant rate period of (0.25-0.00) [6] Okokon, F.B (2002): Shrinkage and moisture loss of dried Melon
of absorption rate with time (12-40) minutes. Seed.
[7] Johnson PNT, Gallats, Oduro-Yeboah.C,Osei-Yaw .A and Westby .A.
Figure 7: Effect of Absorption rate of cassava foo foo with (2006):Sensory properties of Instant Fufu flour from four
high-yielding Ghanaian Cassava. Tropical Science, 46(1): 134-138.
time. It can be observed that in the early hour there was a [8] Itodo, I.N, Adewole, A.M, Edemeka, S.K. (2002): Development of
sharp rise in absorption rate of cassava foo foo and sudden Active Solar Crop Dryer: Design Analysis and performance
later hour sloppy collapse. The increase in time decreases the Evaluation. Nigerian Journal of Renewable Energy.10(1 &2).
absorption rate. Also reconstitution of dried cassava foo foo [9] Taiwo K.A. (2006): Utilization potentials of cassava in Nigeria. The
Domestic and Industrial products. Food Review International, 22-42.
using hot water with initial reconstitution of 3.8 with constant [10] Satori, E. (2000): A Critical Review on equation employed for the
falling rate period of (3.08-0.68) and it decreases with calculation of the Evaporation rate from free water surfaces. Solar
constant rate period of (0.18-0.00) of absorption rate with Energy 68 (1): pages 77-89.
time (12-28) minutes. [11] Abera, S. and Rakshit S.K. (2003):Comparison of physiochemical
and functional properties of cassava starch extracted from fresh roots
Figure 8: Effect of moisture content of cassava foo foo with and dried chips. Starch/starke, 55: 287-296
time. From the graph, it can be observed that increase in time [12] Exell, R.H.B. (2001): A Simple Solar Rice Dryer, Basic Design. Sun
decreases the moisture content of cassava foo foo. The World 4, pages 186-191.
moisture content of cassava foo foo reached its peak level at [13] McCabe, W.L, and Harriot, P. (2001): Unit Operation of Chemical
Engineering. Sixth Edition, McGraw-Hill,New York, pages
76.88% with time at 4 hours after which the curve becomes 797-800.
flat indicating no further loss of moisture. Also the graph [14] Crank, N. (2005): Mathematics of Diffusion. Oxford Press, New
shows the reconstitution of dried cassava foo foo using hot Jersey.
water with initial increase in moisture content of 76.88% with
falling rate period (3.08-0.68) and it decreases linearly with
increase in time (8-10) minutes.
Figure 9: Effect of absorption rate of cassava foo foo with
moisture content. The graph shows the reconstitution of dried
cassava foo foo using hot water. Increase in absorption rate of
cassava foo foo increases the moisture content and absorption
rate is linearly increase with moisture content at 0%-76.88%.
VI. CONCLUSION
From the plot of drying and reconstitution rate (rehydration)
against moisture content and time, results showed reduction in
moisture content of cassava foo foo from 54.36% to 13.56%
during ten hours of drying. From the drying curves obtained,
constant drying rate for cassava foo foo is 4.7grams moisture
per hour and the falling rate period commenced at critical
moisture of 36.37%. Changes were obtained in colour
(darkening in colour), harder texture, shrinkage, case
hardening, and deduction in offensive odour of cassava foo
foo after solar drying. Increase in volume of the powdered
cassava foo foo is greater in the hot water than cold water
during reconstitution process. Cassava foo foo could not be
reconstitution by either cold or hot water due to the breakage
of its polymeric bonds as a result of the drying and grinding
processes. Therefore the knowledge of the rate of drying and
rate of reconstitution in this study can be used in the design of
dryer that will minimize the deterioration in the eating quality
and nutritive value of cassava foo foo in order to extend its
shelf life.
REFERENCE
[1] .Alloys, N. and Ming Z.H. (2006): Traditional cassava food in
Burundi food Review International, 22-1-27.
[2] Chiou, D. Langrish, T.A.G, Braham, R. (2008):Partial
Crystallization Behaviour during Spray drying.
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