水稻籽实中砷的结合形态特征及其稳定性  

Characteristic of binding forms of arsenic in polluted rice seed and their stability.

作　　者：何孟常[1] 杨居荣[1] 

机构地区：[1]北京师范大学环境科学研究所

出　　处：《应用生态学报》2002年第9期1141-1144,共4页Chinese Journal of Applied Ecology

基　　金：国家自然科学基金 ( 2 99770 0 2 );水环境模拟国家重点实验室开放基金资助项目 ( 990 5 ) .

摘　　要：利用凝胶层析方法对水稻籽实中As的结合形态特征及其稳定性进行了研究 .结果表明 ,水稻籽实中存在的As主要与表观分子量为 5 4.5KD和 5 .5KD的蛋白质形成结合体 .分子量为 5 4.5KD的蛋白质 As结合体不太稳定 ,并且在蒸煮加热和体外消化酶的作用下容易分解 ,生成相对稳定的、小分子的结合体形式 .The protein-binding forms of As in polluted rice seed and their stability were studied using the methods of Sephadex chromatography. The results showed that As in rice seed was mainly combined with the proteins with apparent molecular weights of 54.5 KD and 5.5 KD. The protein-binding form of As (54.5 KD) was unstable, and was easily decomposed into stable and tiny molecular under the treatment of steaming and digestive enzyme.

关 键 词：水稻籽实 砷 结合形态 稳定性 农产品 重金属 毒性 

分 类 号：S511[农业科学—作物学]