| Starch Modification for Slow Release of Herbicide Encapsulated with Concentrated Starch Paste |
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| 作者姓名： | ZHU Zhifeng YU Cuiyun ZHOU Xinhua WANG Liping |
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| 作者单位： | [1]College of Chemistry and Molecular Science, Wuhan University, Wuhan 430072, Hubei, China [2]National Test Center for Warp Sizing, Southern Yangtze University, Wuxi 214122, Jiangsu, China |
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| 基金项目： | Supported by the National High-Technology Development Program of China （2002AA327120） |
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| 摘 要： | An attempt on starch modification has been made to increase the paste concentration of potato starch for reducing the energy consumption required for the encapsulation of herbicide within starch matrix by encapsulating 2,4-D as model herbicide. The matrix behaviors were evaluated in terms of the herbicide content,capability of swelling in water,encapsulation efficiency,and the rate of herbicide released from the matrix. To increase paste concentration of starch for decreasing the energy consumption in dry process,potato starch was acidified before the encapsulation. However,the matrix prepared in such a way showed that it weakened the control to the herbicide encapsulated,which increased the rate of herbicide released from the matrix. By introducing covalent bonds among starch molecules,the problem with the control and release rate can be completely solved. Moreover,the effects of formaldehyde amount,medium pH,herbicide content,and particle size on the matrix behaviors and release rate were also investigated. The newly developed matrix shows low capability of swelling and slow release,and reduces water evaporation in dry process by about 40% during matrix preparation.
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| 关 键 词： | 除草剂 浓缩淀粉糊包囊 缓慢释放 淀粉改性 |
| 文章编号： | 1007-1202（2007）03-0515-07 |
| 收稿时间： | 20 June 2006 |
| 修稿时间： | 2006-06-20 |
Starch modification for slow release of herbicide encapsulated with concentrated starch paste |
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| ZHU Zhifeng YU Cuiyun ZHOU Xinhua WANG Liping.Starch Modification for Slow Release of Herbicide Encapsulated with Concentrated Starch Paste[J].Wuhan University Journal of Natural Sciences,2007,12(3):515-521. |
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| Authors: | Zhu Zhifeng Yu Cuiyun Zhou Xinhua Wang Liping |
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| Institution: | (1) College of Chemistry and Molecular Science, Wuhan University, Wuhan, 430072, Hubei, China;(2) National Test Center for Warp Sizing, Southern Yangtze University, Wuxi, 214122, Jiangsu, China |
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| Abstract: | An attempt on starch modification has been made to increase the paste concentration of potato starch for reducing the energy consumption required for the encapsulation of herbicide within starch matrix by encapsulating 2, 4-D as model herbicide. The matrix behaviors were evaluated in terms of the herbicide content, capability of swelling in water, encapsulation efficiency, and the rate of herbicide released from the matrix. To increase paste concentration of starch for decreasing the energy consumption in dry process, potato starch was acidified before the encapsulation. However, the matrix prepared in such a way showed that it weakened the control to the herbicide encapsulated, which increased the rate of herbicide released from the matrix. By introducing covalent bonds among starch molecules, the problem with the control and release rate can be completely solved. Moreover, the effects of formaldehyde amount, medium pH, herbicide content, and particle size on the matrix behaviors and release rate were also investigated. The newly developed matrix shows low capability of swelling and slow release, and reduces water evaporation in dry process by about 40% during matrix preparation. |
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| Keywords: | starch encapsulation slow release herbicide matrix preparation |
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