Differences of volatile components of different varieties of walnut oils in Xinjiang using gas chromatography-ion mobility spectrometry
In order to study the differences of volatile components in low-temperature pressed walnut oil of main cultivars in Xinjiang,the volatile components in low-temperature pressed walnut oils of Wen 185,Xinxin 2,Xinzaofeng,Xincuifeng,Zha 343 and Wen 81 were analyzed by gas chromatography-ion mobility spectrometry(GC-IMS),and the differences in volatile components among different varieties of walnut oil was analyzed using fingerprint profile combined with principal component analysis(PCA).The results indicated that there were 48 volatile substances were detected in 6 varieties of walnut oil samples,including 13 aldehydes,10 alcohols,10 esters,7 ketones,3 olefins,2 acids,2 ethers and 1 heterocyclic.Esters were the main volatile components of walnut oil,and the relative content of ethyl acetate(monomer)was the highest(10.61%-14.95%).There were differences in the volatile components of low-temperature pressed walnut oils of different varieties.The volatile components of Xinxin 2 and Wen185 walnut oil were similar,while the volatile components of Wen 81 and Xincuifeng walnut oil were similar,and the volatile components of Zha 343 and Xinzaofeng walnut oil were significantly different from other varieties.Therefore,it is feasible to use GC-IMS combined with fingerprint profile and PCA to quickly analyze the differences of volatile component of different varieties of walnut oils.
gas chromatography-ion mobility spectroscopy(GC-IMS)different varietieswalnut oilvolatile component
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