Browsing by Author "Siti Balqis Che Othman"
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Item Experimental and theoretical studies on the effects of fatty acids on the performance of antioxidants in inhibiting the oxidation of selected vegetable oils(Terengganu: Universiti Malaysia Terengganu, 2014-11) Siti Balqis Che OthmanThe aim of this research project was to study the effects of fatty acids on the performance of synthetic antioxidants in inhibiting the autoxidation of selected vegetable oils. In this study, four types of chain-breaking radical scavengers, BHA, BHT, TBHQ and PG, were utilized to test their performances, experimentally and theoretically in the presence or in the absence of fatty acids. Four types of fatty acids, PA, SA, OA and LA were added at several concentrations ranging from 0.25% w/w to 3.0% w/w.Item Experimental and theoretical studies on the production of bio-lubricants based on palm olein and jatropha oil(Terengganu: Universiti Malaysia Terengganu, 2010-12) Siti Balqis Che OthmanThe aim of this research project was to produce bio-based lubricant from triacylglycerol of palm olein and jatropha oil. The process involves three steps of reactions; epoxidation, oxirane ring opening, and followed by alkoxylation. For the epoxidation, the base oil was reacted with peracetic acid generated for safety seasons in situ by reacting acetic acid with hydrogen peroxide in the presence of sulfuric acid as a catalyst.