| Research on Effect of Four Natural Ultraviolet Light Absorbers on Photostabilization of Azadirachtin-A |
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| 作者姓名： | TAN Wei-hong SONG Zhan-qian |
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| 作者单位： | Institute of Chemical Industry of Forest Products/Key Laboratory on Forest Chemical Engineering, Chinese Academy of Forestry, Nanjing 210042, P.R.China |
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| 基金项目： | 国家自然科学基金;江苏省自然科学基金 |
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| 摘 要： | This study examined the photostabilization of Azadirachtin-A （Aza-A） when exposed to ultraviolet light in the presence of some natural absorbers. Aza-A extract solutions with and without natural UV light absorbers in methanol were applied onto the surface of glass slides. At particular intervals, the remaining concentration of Aza-A was analyzed by HPLC. Using first-order kinetic equation, the dissipation half-life values （DT~0） for the degradation of Aza-A under ultraviolet radiation were obtained. It indicated that the addition of ferulic acid, gallic acid, and rutin provided moderate degree of photostabilization of Aza-A and that addition of aloin provided the best photostabilization of Aza-A, among these UV absorbers studied. Photostabilization of Aza-A by different UV light absorbers appears to be due to the competitive energy absorption of UV photons by the absorbers molecules. The dissipation half-life values of Aza-A after irradiation under ultraviolet light suggested that the addition of aloin （in 1 ： 1 mol ratio） can provide better photostabilization of azadirachtin molecule.
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| 关 键 词： | 紫外线 耐光性 农作物保护 吸收性 |
| 收稿时间： | 2006-04-07 |
| 修稿时间： | 2006-09-18 |
Research on Effect of Four Natural Ultraviolet Light Absorbers on Photostabilization of Azadirachtin-A |
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| TAN Wei-hong SONG Zhan-qian.Research on Effect of Four Natural Ultraviolet Light Absorbers on Photostabilization of Azadirachtin-A[J].Agricultural Sciences in China,2006,5(11):855-858. |
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| Authors: | TAN Wei-hong SONG Zhan-qian |
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| Abstract: | This study examined the photostabilization of Azadirachtin-A (Aza-A) when exposed to ultraviolet light in the presence of some natural absorbers. Aza-A extract solutions with and without natural UV light absorbers in methanol were applied onto the surface of glass slides. At particular intervals, the remaining concentration of Aza-A was analyzed by HPLC.Using first-order kinetic equation, the dissipation half-life values (DT50) for the degradation of Aza-A under ultraviolet radiation were obtained. It indicated that the addition of ferulic acid, gallic acid, and rutin provided moderate degree of photostabilization of Aza-A and that addition of aloin provided the best photostabilization of Aza-A, among these UV absorbers studied. Photostabilization of Aza-A by different UV light absorbers appears to be due to the competitive energy absorption of UV photons by the absorbers molecules. The dissipation half-life values of Aza-A after irradiation under ultraviolet light suggested that the addition of aloin (in 1:1 mol ratio) can provide better photostabilization of azadirachtin molecule. |
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| Keywords: | ultraviolet light photostabilization Aza-A bioinsecticide |
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