| 污染小麦籽实中As的主要存在形态及其稳定性 |
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| 引用本文： | 何孟常,杨居荣,张平,宋薇.污染小麦籽实中As的主要存在形态及其稳定性[J].北京师范大学学报(自然科学版),2001,2(1):126-130. |
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| 作者姓名： | 何孟常 杨居荣 张平 宋薇 |
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| 作者单位： | 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, 100875, 北京
2. 北京市理化分析测试中心, 100081, 北京 |
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| 基金项目： | 国家自然科学基金资助项目(49771069)；
水环境模拟国家重点实验室开放基金资助项目 |
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| 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％，记中只占2％，剩余残渣中占24％，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54500和5500，在消化酶的处理下，大分子蛋白质－As结合体不稳定，可发生分解变成相对分子质量较小的结合物。
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| 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 |
| 修稿时间： | 2000年8月5日 |
THE MAIN EXISTING FORMS OF ARSENIC IN POLLUTED WHEAT SEED AND ITS STABILITY |
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| He Mengchang,Yang Jurong,Zhang Ping,Song Wei.THE MAIN EXISTING FORMS OF ARSENIC IN POLLUTED WHEAT SEED AND ITS STABILITY[J].Journal of Beijing Normal University(Natural Science),2001,2(1):126-130. |
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| Authors: | He Mengchang Yang Jurong Zhang Ping Song Wei |
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| Abstract: | 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). |
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| Keywords: | wheat seed arsenic binding forms stability digestive enzyme |
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