Effect of Pretreatment with Dehulling and Microwaving on the Flavor Characteristics of Cold-Pressed Rapeseed Oil by GC-MS-PCA and Electronic Nose Discrimination

文献类型： 外文期刊

第一作者： Zhou, Qi

作者： Zhou, Qi;Yang, Mei;Huang, Fenghong;Zheng, Chang;Deng, Qianchun;Zhou, Qi;Yang, Mei;Huang, Fenghong;Zheng, Chang;Deng, Qianchun

作者机构：

关键词： dehulling;electronic nose;flavor;microwave;rapeseed

期刊名称：JOURNAL OF FOOD SCIENCE （ 影响因子：3.167； 五年影响因子：3.376 ）

ISSN： 0022-1147

年卷期： 2013 年 78 卷 7 期

页码：

收录情况： SCI

摘要： Raw and dehulled rapeseeds were treated with microwave energy (800 W) from 1 to 8min with 1-min intervals at a frequency of 2450 MHz to investigate the influence of microwaving and dehulling pretreatment on the flavor characteristics of rapeseed oil extracted by pressing. Headspace solid phase microextraction was used to isolate the volatile compounds of rapeseed oil, which were then identified by gas chromatography-mass spectrometry analysis. The results indicated that microwave and dehulling pretreatment of rapeseed can significantly influence the kinds and content of volatile compounds. The key flavor compounds in rapeseed oil were oxidized volatiles, heterocyclic compounds, and degradation products of glucosinolates. A pungent compound, 4-isothiocyanato-1-butene, was reduced by 97% in rapeseed treated for 3min with microwaves energy when compared to the rapeseed oil without any treatment. The pyrazine compounds in the oil appeared after 6min of microwave pretreatment and give a pleasant roasting flavor when compared to crude oils. Principal component analysis was able to differentiate between oils obtained using 4 pretreatment processes based on volatile compounds and electronic nose. The results showed that dehulling pretreatment could improve the flavor, yet microwaving had a greater effect on the flavor of rapeseed oils.

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