污染小麦籽实中As的主要存在形态及其稳定性  

THE MAIN EXISTING FORMS OF ARSENIC IN POLLUTED WHEAT SEED AND ITS STABILITY

作　　者：何孟常[1] 杨居荣[1] 张平[1] 宋薇[2] 

机构地区：[1]北京师范大学环境科学研究所,环境模拟与污染控制国家重点联合实验室,北京100875 [2]北京市理化分析测试中心,北京100081

出　　处：《北京师范大学学报（自然科学版）》2001年第1期126-130,共5页Journal of Beijing Normal University(Natural Science)

基　　金：国家自然科学基金资助项目 !(4 97710 6 9) ;水环境模拟国家重点实验室开放基金资助项目

摘　　要：对污染小麦籽实中As的存在形态及其稳定性进行研究 ,结果表明 :As在小麦籽实的主要营养成分中 ,以蛋白质中的分布比例最高 ,达 74 % ,脂肪中只占 2 % ,剩余残渣中占 2 4 % .小麦籽实中的As以蛋白质结合形态为主 ,其表观相对分子质量分别为 5450 0和 550 0 ,在消化酶的处理下 ,大分子蛋白质 As结合体不稳定 。The chemical forms of As in polluted wheat seed and its stability was evaluated. The results show that in various nourish components of protein, fat and residues, the percentage of As in protein is the highest (74%), As in fat is very little (2%), the percentage of As in residue is 24%. As in wheat seed chiefly exists in association with the parts of high protein. The apparent molecular weight of protein binding As is 54 500 and 5 500 , respectively. After the treatment of pepsin and trypsin digestion, the protein binding As with molecular weight of 54 500 is not stable, and is easily decomposed into the low molecular weight protein binding forms (5 500).

关 键 词：小麦籽实 结合形态 稳定性 消化酶 砷 相对分子质量 农产品污染 

分 类 号：X835[环境科学与工程—环境工程] X503.231