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Abstract
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Article Information:
Chemical Composition of Seed Oil from Roselle (Hibiscus sabdariffa L.) and the Kinetics of Degradation of the Oil During Heating
G. Bouanga-Kalou, A. Kimbonguila, J.M. Nzikou, F.B. Ganongo-Po, F.E. Moutoula, M. Tchicaillat-Landou, R.M. Bitsangou, Th. Silou and S. Desobry
Corresponding Author: Jean Mathurin Nzikou
Submitted: 2010 December, 28
Accepted: 2011 January, 27
Published: 2011 February, 20 |
Abstract:
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The aim of the study was to investigate the chemical composition and the kinetics of degradation
of roselle seed oil during heating. The seed is a good source of oil (23.27%). The physical properties of the oil
extracts showed the state to be liquid at room temperature and indicated that the oil had refractive index,
1.4652; the peroxide value, 3.15 (meq O2/kg oil); free fatty acid, 0.82%; iodine value, 97.78%; saponification
value, 198.45 and viscosity, 15.15 (mPa.s at 25ºC). Gas liquid chromatography technique has been developed
for identification and quantitative determination of total unsaturated and saturated fatty acids shows that the
crude oil had 73.4 and 26.57%, respectively. DSC indicates the presence of two components in oil extracted.
The first peak at low melting point appears at -20.53°C (Hf = +3.00 J/g) and the second peak appears to -2.17°C
(Hf = +0.49 J/g). The degradation kinetic of the oil was also investigated. The thermal oxidation of the double
bonds of the oil showed a first-order thermal oxidation kinetic and the Arrhenius plot yielded a straight
line with a slope equivalent to activation energy of 9.041 KJ/mol. There is the possibility of considering the
seed as feed supplement and its oil for industrial application.
Key words: Essential fatty acid, DSC, Hibiscus sabdariffa L. seed, kinetics, viscosity, ,
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Cite this Reference:
G. Bouanga-Kalou, A. Kimbonguila, J.M. Nzikou, F.B. Ganongo-Po, F.E. Moutoula, M. Tchicaillat-Landou, R.M. Bitsangou, Th. Silou and S. Desobry, . Chemical Composition of Seed Oil from Roselle (Hibiscus sabdariffa L.) and the Kinetics of Degradation of the Oil During Heating. Research Journal of Applied Sciences, Engineering and Technology, (02): 117-122.
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ISSN (Online): 2040-7467
ISSN (Print): 2040-7459 |
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