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Quality analysis of cooking waste oil and edible vegetable oil by GC-MS
  
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KeyWord:hogwash oil  deep-frying oil  qualified vegetable oil  GC-MS  
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Abstract:
      The distinctive fatty acid compositions of cooking waste oil were identified by GC-MS.The fresh pressed rapeseed oil,blend oil,hogwash oil and deep-frying oil were saponified and methyl esterified,then the fatty acids of them were separated by capillary column DB-5MS and detected by GC-MS.The results showed that the relative unsaturation(U/R,1.9) of fatty acids in cooking waste oil was significantly less than that of the qualified oil(U/R,4.4),and they contained distinctive fatty acids such as tridecylic ac...
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