牛皮水解蛋白质氨基酸评分及其危害分析

为评价婴儿配方乳粉掺假成分——牛皮水解蛋白质对婴儿健康的潜在危险性，对牛皮水解蛋白质的氨基酸进行评分并分析了污染物指标。采用半定量方法对在阜阳抽检的60份婴儿配方乳粉中牛皮水解蛋白质的情况进行了检测与评估。结果发现，与乳粉相比，牛皮水解蛋白质甘氨酸含量高，含硫氨基酸等必需氨基酸含量普遍低。以FAO／WHO推荐的婴儿氨基酸模式为100，牛皮水解蛋白质氨基酸评分仅为19。污染物指标未见超标。在60份抽检乳粉中，70％的样品蛋白质总量不合格，约40％的样品不同程度地掺有牛皮水解蛋白质，提示劣质乳粉蛋白质“质”、“量”均存在问题。建议加强食品营养学指标的监测和掺假成分的快速鉴别方法的研究。

Evaluation of Amino Acid Pattern of Hydrolytic Cattle Hide Protein and its Potential Risk on Infants

To evaluate the potential risk of cattle hide protein on infants health, its amino acid pattern and contamination indexes were analyzed. Sixty brands of infant milk powder, from markets and households in Fuyang were collected and analuzed by semi-quantitative method. It was found that: 1) In comparison with milk protein, glycine was characteristically increased in cattle hide protein, while essential amino acids were rather low. Its amino acid score was only nineteen based on FAO/WHO recommended infants amino acid pattern (1985). 2) Contamination indexes of toxic metals (Pb, As, Hg, Cd) in hydrolytic cattle hide protein fell in normal range. 3) For the 60 infant milk powder samples, 70% had low protein content, about 40% was adulterated with cattle hide protein, which suggested inferior quality products. The present study showed it was important to strengthen the inspection of food nutrition indexes and set up rapid assay method for detecting adulterated components.