Submitted to: Annual Meeting and Expo of the American Oil Chemists' Society
Publication Type: Abstract Only
Publication Acceptance Date: 5/13/2007
Publication Date: 5/13/2007
Citation: Knothe, G.H. 2007. The Analysis of Biodiesel Oxidation [abstract]. Annual Meeting and Expo of the American Oil Chemists' Society, Quebec City, Canada.
Technical Abstract: Oxidative stability is one of the major technical issues facing biodiesel, an alternative diesel fuel derived from vegetable oils, animal fats or used frying oils. The content of unsaturated fatty acids, especially those with bis-allylic methylene positions, is the main cause of this problem. Besides researching methods to alleviate this problem, the analysis of the oxidative state of biodiesel is needed to better understand the problem and to assess the quality of existing biodiesel as related to oxidation. Various methods have been applied to analyzing biodiesel with respect to oxidation, which include the oil stability index (OSI) or Rancimat test, acid value, differential scanning calorimetry, iodine value, peroxide value, viscosity and nuclear magnetic resonance (NMR). Each of these methods analyzes specific chemical and physical features of oxidation, including induction time, viscosity, acid formation, fatty acid composition and others.