不同来源油脂的热解-气相色谱/质谱分析

Q. Qiu, Yiting Zhang
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引用次数: 0

摘要

再生地沟油(即废油)占食用油市场的10%,造成了严重的食品安全问题。目前,地沟油的鉴别还没有标准的规程。本研究采用热解-气相色谱/质谱(pygc /MS)方法对11种油类样品进行了分析,包括食用植物油(茶油、玉米油、橄榄油、葵花籽油、花生油和混合植物油)和废油(用过的煎炸油、猪油、鸡油、劣质油和厨余油脂)。考察了热解温度、反应时间和样品体积三个因素对分析参数的影响。最佳热解条件为600℃、1 min、进样量0.3 μL。在所有油样品中均发现了五种特征成分(十四烷、z、z-9、12-十八烯二酸、癸酸-2-丙烯酯、17-十八烯酸和z-9-十八烯酸)。动物脂肪和其他劣质油脂的热解产物中存在C11-C16烯烃,可用于区分植物油和地沟油。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Pyrolysis-Gas Chromatography/Mass Spectrometry Analysis of Oils from Different Sources
Regenerated gutter oil (i.e., waste oil) accounts for 10% of the edible oil market, which has caused serious food safety issues. Currently, there is no standard protocol for the identification of the gutter oil. In this study, the pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS) method was employed to analyze eleven oil samples including edible vegetable oils (tea oil, corn oil, olive oil, sunflower oil, peanut oil and blend vegetable oil) and waste oils (used frying oil, lard, chicken fat, inferior oil and kitchen waste grease). Three factors of pyrolysis temperature, reaction time and sample volume were investigated to optimize the analytical parameters. The optimal pyrolysis conditions were determined to be 600°C, 1 min and an injection volume of 0.3 μL. Five characteristic components (tetradecane, z,z-9,12-octadecadienoic acid, decanoic acid-2-propenyl ester, 17-octadecenoic acid, and z-9-octadecenoic acid) were found in all oil samples. The existence of C11-C16 olefins in the pyrolytic products of the animal fats and the other low-quality oils could be utilized to distinguish vegetable oils from gutter oils.
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