Impact of Diets RichDietary Protein on in ct - Linolenic AcidPolyunsaturatedFatty Acid Desaturation in Rats Fed
نویسنده
چکیده
Delta 6-desaturase actiyity and fatty acid composition of liyer microsomes were measured periodically in rats fed diets high in oc-linolenic acid (perilla oil) containing either casei" (CAS) or soybean protein (SOY) as a protein source. Delta 6-desaturase activity measured by using li"oleic'acid as a substrate (18:2n-6.18:3n-6) and the linoleic acid desaturation index as estimated by the (20:3+20:4)l18:2 ratio in microsomal phospholipids were significantly higher in rats fed the CAS diet han in those fed the SOY diet at days 4 and thereafter. The proportion of eicosapentaeiloic acid (20 : 5n-3) was also significantly higher in the CAS group than in the SOY group. These results confirmed a differential mpact of the dietary protein type on the metabolism of polyunsaturated fatty acids even when rats were fed fat rich in ct-linolenic acid.
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