Oxidative properties of oils extracted from four oilseeds consumed in Côte d’Ivoire : Ricinodendron heudelotii, Cyperus esculentus, Citrullus colocynthis and Irvingia gabonensis. (Published)
The many nutritional, pharmaceutical and industrial applications of oils extracted from plant seeds have in recent years generated growing scientific interest in the search for new unconventional oilseed sources. The needs of the oilseed market and the detection of new functionalities have aroused, at national level, an interest in scientific and technical research towards local plant oilseed sources, which are still under-exploited. The objective of this study was to extract the oils of Ricinodendron heudelotii, Cyperus esculentus, Citrullus colocynthis and Irvingia gabonensis and then to characterize them from a physico-chemical and nutritional point of view in order to evaluate their potential for use in the food, pharmaceutical and cosmetic industries. To do so, we evaluated their ability to resist oxidation through the measurement of oxidation indices. The results of this work showed a progressive increase in acidity and p-anisidine index, and a progressive decrease in peroxide value during storage at room temperature for 180 days. It appears that Ricinodendron heudelotii, Citrullus colocynthis, Cyperus esculentus and Irvingia gabonensis oils have chemical and biochemical potentials that could be exploited in the food, cosmetic and pharmaceutical fields.
Effect of Mycodeteriorative Fungi on the Vegetable Oil from Kernels of Irvingia Gabonensis Sold In Parts of Nigeria (Published)
Sanitary survey was conducted on the kernels of Irvingia gabonensis sold within the four ecological zones of Nigeria. The aim was to ascertain the effect of mycodeteriorative fungi on the dietary quality of vegetable oil from kernels of Irvingia gabonensis. The study screened for presence of lipid degrading saprotrophs as well as ascertained the quantity of vegetable oil and free fatty acid components using Microbiological and Biochemical methods. Results showed presence of saprotrophs at varying frequencies; Aspergillus flavus, from 17.61±0.25% (Abuja) to 28.33±0.02% (Kebbi); Aspergillus niger, from 14.38±5.07% (Imo) to 23.33±1.05% (Lagos). Fusarium moniliforme, from 13.01±2.89% (Bauchi) to 22.00±2.14% (Lagos). Lasiodiplodia theobromae, from 9.64±1.34% (Bauchi) to 24.00±2.36% (Imo). Penicillium italicum, from 5.00±8.31% (Benue) to 13.21±6.01% (Kebbi). Rhizopus stolonifer, from 11.00±7.32% (Lagos) to 28.35±2.37% (Abuja). These isolates were confirmed to be associated with the lipid degradation of the kernel of Irvingia gabonensis reducing the percentage weight of vegetable oil content from 61.81±0.02(control) to 30.52± 6.14% (study locations) and increasing quantity of free fatty acids from 0.511±10.18 (control) to 6.28±0.05 % (study locations). Strict sanitary supervision of food wares is advocated.Lipid degradation technology of these mycobiota can be exploited by cosmetic industry to improve free fatty acid contents of low fat oils.