Analysis of Fat and Fatty Acids Composition and Content in Walnut Varieties

The paper aimed that analyzing the fat composition and the differences of fatty acids composition and content appear in different walnut varieties kernel by the method of gas chromatography(GC).The results showed that the fat contents were about 66% in all of the walnut kernel.12 kinds of fatty acids,including Tetradecanoic(C14∶0),Palmitic(C16∶0),Palmitoleic(C16∶1n7),Heptadecanoicn(C17∶0),Cis-10-Heptadecenoic Heptadecanoicn(C17∶1n7),Stearic(C18∶0),Oleic(C18∶1n9c),Linoleic(C18∶2n6c),α-linolenic(C18∶3n3),Arachidic(C20∶0),Cis-11-Eiscosenoic(C20∶1),Docosanoic(C22∶0)were detected in the six walnut varieties kernels.The carbon numbers of the fatty acids were mainly between 16 and 18.The fatty acids in walnut kernel mainly included Polyunsaturated fatty acid and Monounsaturated fatty acid,less saturated fatty acid.The varieties of Qinglin and Yuanlin had the highest and the lowest Linoleic acid contents,reached to 42.19 g/100g and 36.12 g/100g,respectively.