中国市场食品中反式脂肪酸含量现状调研

摘要

比较了中国市售食品中的反式脂肪酸(TFA)含量调研数据,包括家用烹调油、餐饮用油和常见含油食品产品.从市场购买样品,然后测定TFA含量并进行分析和比较.对133个品牌的581个家用烹调油样品进行了测定,包括调和油、大豆油、玉米油、葵花籽油、菜籽油、橄榄油、花生油、芝麻油、茶籽油等15个油种.结果发现87.52％的烹调油样品中TFA质量分数在2％以下.收集并测定了5个油种74个样品的餐饮用油,结果表明各油种的TFA质量分数为0.45％～ 1.68％,可见调查范围内餐饮用油的TFA维持在一个较低水平.而对蛋糕、面包、饼干、炸薯条、冰激凌、巧克力、爆米花、方便面、植脂末、植物奶油等各类常见含油食品共计9大类76个主要品牌的257个样品进行分析的结果则表明,其TFA含量与2005～2010年公开发表的市场调研数据相比有了大幅度的下降.蛋糕面包派、饼干两类产品的TFA质量分数高于1％(油基),其他产品中TFA的质量分数较低.对各类主要产品间TFA含量和种类的差异原因也进行了深入分析.%The aim of this study is to provide reliable and comparable data on trans fatty acid (TFA) content of foods in China.A TFA market survey was performed on bottled cooking oil,catering cooking oil and some popular oil -bearing food.Samples were collected from market followed by TFA measurement and data analysis.581 bottled cooking oil samples from 133 brands were examined.These samples covered 15 oil varieties including blended oil,soybean oil,corn oil,sunflower oil,rapeseed oil,olive oil,peanut oil,sesame oil and camellia oil,etc.The results showed that TFA content of 87.29％ samples are no more than 2％.74 samples from 5 different categories of catering oil were collected and studied.It was found that the mass fraction of TFA was 0.45％ and 1.68％,showing that TFA content of these 5 categories of catering oil was kept at a quite low level.Furthermore,TFA contents in some popular oil-bearing food were also investigated.TFA content in 257 samples was studied including cake,bread,cookie,chips,ice cream,chocolate,popcorn,instant noodles,non-dairy cream and whip topping,etc.9 categories and 76 leading brands were involved.The TFA contents in these foods had decreased dramatically compared to the published data in 2005～2010.The TFA mass fraction of the two food categories(cake,bread & pie and cookies)exceeds 1％ (oil base),while others contain lower TFA mass fraction.Thus intensive studies are required to identify why TFA contents fluctuate greatly among various food categories.