FUW TRENDS IN SCIENCE & TECHNOLOGY JOURNAL
(A Peer Review Journal)
e–ISSN: 2408–5162; p–ISSN: 2048–5170
keywords: Transesterification, methylesters, free fatty acid, gas column mass spectroscopic (GC-MS)
Oils were extracted from castor, neem and rubber seeds plants using Soxhlet apparatus and their physical and chemical (physico-chemical) properties were determined. The acid values were 12.69, 12.64 and 7.60 mg KOH/g for castor, neem and rubber seed oil, respectively. The iodine value of castor oil was 97.61 gI2/100g while that of neem oil was 84.20 gI2/100g and rubber seed oil has an iodine value of 136.21 gI2/100g. However, after dehydration the iodine value of castor seed oil increased to 131.00 gI2/100g which made the dehydrated castor seed oil a drying oil just as rubber seed oil. The free fatty acids in castor seed oil are palmitic acid (9.25%), ricinoleic acid (74.42%), linoleic acid (6.55%), stearic acid (7.60%) and oleic acid (2.18%). The neem seed oil GC-MS analysis revealed eight prominent free fatty acids which are myristic acid (0.92%), palmitic acid (27.81%), margaric acid (0.50%), linoleic acid (45.56%), stearic acid (19.69%), arachidic acid (3.83%), behenic acid (1.05%) and heptacosanoic acid (0.64%). Rubber seed oil free fatty acids include myristic acid (0.57%), palmitic acid (23.12%), linoleic acid (50.04%), stearic acid (20.32%), oleic acid (2.39%), arachidic acid (1.44%) and linolenic acid, omega- 3 fatty acid, an essential unsaturated fatty acid (2.12%). Other uses of the free fatty acids were also proffered besides their used for the preparation of alkyd resins.
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