Comparison of physicochemical properties and oil characteristics of walnuts from eight regions
  
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KeyWord:walnut  walnut oil  physicochemical property  metal element  fatty acid composition  vitamin E
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GENG Pengfei,PENG Yinxue, HU Chuanrong,etc  
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Abstract:
      The physicochemical properties of walnut, metal elements and fatty acid composition of walnut oils from eight regions of Guizhou, Hebei, Chongqing, etc. were compared and studied. The walnut oil samples were obtained by cold pressing method. The physicochemical indexes of eight kinds of walnut, metal elements, vitamin E and fatty acid compositions of walnut oils were determined. The results showed that the crude protein content in walnut, and contents of oleic acid, vitamin E and metal elements in walnut oil from Guizhou were higher. The contents of copper, calcium, magnesium and potassium in walnut oil from Guizhou was the highest, and the vitamin E content in walnut oil from Guizhou was 662.24 μg/kg, which was the third among eight kinds of walnuts. So Guizhou walnut had stronger oxidative stability and higher nutritional value.
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