摘要
针对现存的地沟油检测方法的缺陷,从理论上分析了地沟油精炼过程中不易被除去的物质,根据不易被除去的物质中含有羰基和羟基的原理设计通过测定油样品中羰基价和羟基价鉴别地沟油的方法。结果表明:经使用的油的羟基价均明显高于常用食用油,即使是精制地沟油的羟基价也是常用食用油的三倍多,因此羟基价是一个特异性较强的检测指标。
Although detection methods for waste edible oil are currently available,these methods have defects.According to our theoretical analysis,those materials which are hard to remove during refining of waste edible oil contain carbonyl or hydroxyl groups.In this study,two methods were presented to identify waste edible oil by measuring carbonyl and hydroxyl values,respectively.Used cooking oils had an obviously higher hydroxyl value than fresh ones.There was an over three-fold increase in the hydroxyl value as compared with the fresh cooking oils,even though the used cooking oils were refined.Thus hydroxyl value is a specific indicator to identify waste edible oil.
出处
《食品科学》
EI
CAS
CSCD
北大核心
2013年第14期311-314,共4页
Food Science
关键词
地沟油
羟基价
甘油二酯
综合指标体系
waste edible oil
hydroxyl value
diglyceride
comprehensive detection index system
