Analysis of Fatty Acid Composition in Pressed and Extracted Walnut Oil by Gas Chromatography-Mass Spectrometry
Walnuts from Huixian county,Longnan were extracted by pressing and extraction,and the fatty acid composition and content of the extracted walnut oil were analyzed by gas chromatography-mass spectrometry.The results showed that the walnut oil output rate was 41.97%under the pressing process,and the walnut oil output rate was 45.61%under the extraction process.The walnut oil output rate of the extraction process was higher than that of the pressing process.The main fatty acids of pressed and extracted walnut oils were linoleic acid,oleic acid,α-linolenic acid,palmitic acid,and stearic acid,while the total amount of saturated fatty acids,unsaturated fatty acids linoleic acid and α-linolenic acid in pressed walnut oil were higher than those in leached walnut oil,indicating that the extraction process had a great influence on the fatty acid content in walnut oil.
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