14B-22

F. JAHANIAVAL, Y. Kakuda, and M. F. Marcone. Department of Food Science, University of Guelph, Guelph, ON N1G2W1, Canada

The fatty acid composition can be used to evaluate the stability and nutritional quality of fats and oils but not always their functional properties. What is important for determining functionality is the type and the amounts of the various triacylglycerol (TAGs) species in the oil.

Our objective was to compare the compositional and functional properties of different seed and grain oils, based on their fatty acid and TAGs compositions.

The fatty acid and TAG compositions of five amaranthus species (A.K343, A. K433, A.K432, R149 and 1011) were analyzed by GC and RP-HPLC, and their compositional properties compared with buckwheat, corn, rice bran, soybean, sesame, quinoa and cottonseed oils.

Our results show that all amaranthus species were relatively high in palmitic (19.5 to 23.8%) and low in oleic (22.8 to 31.5%) and linolenic (0.65 to 0.93%) acids compare to those of other grain oils except cottonseed oil (25.7, 17.7 and 0.22, respectively). The fatty acid composition of amaranthus species K343, K433 and K432 (group I) were different from R149 and 1011 (group II) especially, in mono and polyunsaturated fatty acids, but the S/U ratios were very similar. All amaranthus species had similar TAG type but showed slightly differences in percentage. High similarities in UUU, UUS and USS composition were observed among amaranthus K343, K433 and K432, and between R149 and 1011. The fatty acid composition and S/U ratio of amaranthus and cottonseed oil were very similar, but the low melting TAGs (LLL, PLL, OOL and PPL) were different in amaranth and cottonseed oil. The grain and seed oils were different from each other and to the amaranthus species oil in terms of fatty acid, S/U ratios and TAG ratios. The UUU, UUS and USS percentages were very diverse in grain oils.