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目的了解上海地区部分市售食品中的反式脂肪酸(trans-fatty acids,TFAs)含量以及异构体组成,为开展TFAs的风险评估和食品选择提供参考。方法于2011年1～6月在上海市超市、面包店或快餐店中抽取具有代表性的9大类共106种市售食品,包括植物油、乳及乳制品、休闲食品、方便食品、快餐食品、饮料、小吃甜饼、调味品和畜禽肉及制品,采用银离子固相萃取(Ag+-SPE)结合气相色谱方法检测TFAs含量。结果抽检样品中的TFAs以反式油酸(t C18∶1)为主,反式多不饱和脂肪酸含量较少。除黑咖啡外,其余105种食品均检测到TFAs,其中,巧克力派的TFAs含量最高(1 711.58 mg/100 g)。反刍动物食品和含乳及乳制品的食品中11t C18∶1异构体含量较高(占总TFAs的53.9%～100.0%)。富含氢化油的休闲食品中9t C18∶1异构体含量较高(占总TFAs的14.3%～87.7%)。猪肉和牛肉经加工后TFAs含量有不同程度降低。结论市售食品中普遍检测到TFAs,食物成分和加工过程不同总TFAs含量及异构体组成存在较大差异,预包装休闲食品和西式甜饼店食品含有较多的TFAs。
Objective To understand the contents of trans-fatty acids (TFAs) and isomers in some commercially available foods in Shanghai and provide references for risk assessment and food selection of TFAs. Methods From January to June 2011, a total of 106 kinds of commercially available foods, including vegetable oil, milk and dairy products, snack foods, convenience foods and fast food products, were collected from 9 major categories in supermarkets, bakeries and fast food restaurants in Shanghai. , Beverages, snacks cookies, condiments and livestock and poultry meat and products, using silver ion solid phase extraction (Ag + -SPE) combined with gas chromatography to detect TFAs content. Results TFAs in the sample were mainly trans-oleic acid (t C18:1) with less trans-polyunsaturated fatty acids. TFAs were detected in the remaining 105 kinds of food except black coffee, of which chocolate had the highest TFAs (1 711.58 mg / 100 g). Rutin foods and foods containing milk and dairy products contained higher amounts of 11t C18: 1 isomers (53.9% to 100.0% of total TFAs). The content of 9t C18: 1 isomer in the snack food rich in hydrogenated oil is high (accounting for 14.3% ~ 87.7% of the total TFAs). TFAs content of pork and beef decreased to some extent after processing. Conclusion TFAs are commonly detected in commercial products. There is a big difference in total TFAs content and isomer composition in food composition and processing. Pre-packaged snack foods and western-style cookies contain more TFAs.