气相色谱法测定奶茶中的反式脂肪酸

摘要

Gas chromatography was used to determine the trans fatty acid composition of common commercially available milk tea,cream and fruit powder.The results showed that trans fatty acid content was 0.5-3 g per 300 mL of milk tea,8.6 g per 100 g of cream,and 1-2.2 g per 100 g of fruit powder,respectively.Most trans fatty acids in milk tea arose from cream and fruit powder and the major trans fatty acids were trans C18,among which,trans C18：1 exhibited the largest content,followed by trans C18：2.In addition,small amounts of trans C16 fatty acids were identified in milk tea.The results also indicated that trans fatty acid contents of milk tea,cream and fruit powder were high and varied significantly in products and brands.%选取我国市场上常见的品牌奶茶,采用气相色谱法测定8种奶茶产品、7种奶精及20种果粉中的反式脂肪酸组成。结果表明：一杯300mL的奶茶,其反式脂肪酸量在0.5～3.0g之间,奶精中反式脂肪酸含量最高可达8.6g/100g,果粉含量则在1.0～2.2g/100g之间;奶茶中反式脂肪酸主要来自奶精与果粉,以反式C18脂肪酸为主,其中一烯含量最多、二烯含量较少、反式C16脂肪酸甚微。奶茶、奶精及果粉中的反式脂肪酸含量普遍偏高,不同类型、不同品牌的奶茶间和不同口味的果粉间反式脂肪酸含量存在显著性差异。