| Effect of Starch Sources on the Release Rates of Herbicides Encapsulated |
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| 作者姓名： | ZHU Zhifeng YU Cuiyun WANG Liping |
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| 作者单位： | [1]College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, Hubei, China [2]The National Test Center for Warp Sizing, Southern Yangtze University, Wuxi 214122, Jiangsu, China |
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| 基金项目： | 国家新技术研究发展基金(863计划) |
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| 摘 要： | The effects of starch sources on the behaviors of starch matrices and on the rates of herbicides released from the matrices were studied for slow release. The starches considered include native corn starch, wheat starch, potato starch and cassava starch. The matrices were prepared through encapsulating 2,4-dichlorophenoxyacetic or 2,4,5 trichlorophenoxyacetic acids as model herbicides with hot-gelatinized starch pastes. The encapsulation was evaluated in terms of herbicide content, swellability, encapsulation efficiency, and release rate. The results show that starch sources play an important role on the matrix behaviors and on release rates. The rate of 2,4-D released follows the order： wheat starch 〈 potaot starch 〈 corn starch 〈 cassava starch. And for the rate of 2,4,5-T, this order is nearly the same only with an exception that the late two kinds of starch are similar. It is also demonstrated that herbicides with different water solubility show different release rates, no matter what type of starch is used as the matrices.
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| 关 键 词： | 葡萄糖 封装 除草剂 慢释放 |
| 文章编号： | 1007-1202（2006）02-0423-04 |
| 收稿时间： | 2005-04-20 |
Effect of starch sources on the release rates of herbicides encapsulated |
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| ZHU Zhifeng YU Cuiyun WANG Liping.Effect of Starch Sources on the Release Rates of Herbicides Encapsulated[J].Wuhan University Journal of Natural Sciences,2006,11(2):423-426. |
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| Authors: | Zhu Zhifeng Yu Cuiyun Wang Liping |
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| Institution: | (1) College of Chemistry and Molecular Sciences, Wuhan University, 430072 Wuhan, Hubei, China;(2) The National Test Center for Warp Sizing, Southern Yangtze University, 214122 Wuxi, Jiangsu, China |
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| Abstract: | The effects of starch sources on the behaviors of starch matrices and on the rates of herbicides released from the matrices were studied for slow release. The starches considered include native corn starch, wheat starch, potato starch and cassava starch. The matrices were prepared through encapsulating 2,4-dichlorophenoxyacetic or 2,4,5-trichlorophenoxyacetic acids as model herbicides with hot-gelatinized starch pastes. The encapsulation was evaluated in terms of herbicide content, swellability, encapsulation efficiency, and release rate. The results show that starch sources play an important role on the matrix behaviors and on release rates. The rate of 2,4-D released follows the order: wheat starch < potato starch < corn starch < cassava starch. And for the rate of 2,4,5-T, this order is nearly the same only with an exception that the late two kinds of starch are similar. It is also demonstrated that herbicides with different water solubility show different release rates, no matter what type of starch is used as the matrices. |
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| Keywords: | starch sources encapsulation slow release herbicide |
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