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Research on Effect of Four Natural Ultraviolet Light Absorbers on Photostabilization of Azadirachtin-A 总被引:1,自引:0,他引:1
TAN Wei-hong SONG Zhan-qian 《中国农业科学(英文版)》2006,5(11):855-858
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. 相似文献
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