竹醋液对印楝素A和咪鲜胺光解的影响

The effect of bamboo vinegar on photodegradation of azadirachtin A and prochloraz

竹醋液可用于农药增效剂,为探讨竹醋液对农药光解的影响,以高压汞灯为光源,研究竹醋液对印楝素A和咪鲜胺在玻片表面和水中的光解作用,以超高效液相色谱进行检测。结果表明,在水中和玻片表面,竹醋液对2种农药的光解均有光猝灭作用。在玻片表面,竹醋液使咪鲜胺和印楝素A的光解半衰期延长至5.73 min和4.13 min,分别是空白对照的2.2倍和1.4倍。和对照相比,竹醋液能延长水中咪鲜胺和印楝素A的光解半衰期3.9倍和2.4倍。稀释30倍的竹醋液相当于浓度为57.45 mg·L^(-1)的化学抗光剂对氨基苯甲酸对印楝素A的抗光效果。竹醋液能显著延长供试农药光解的半衰期,有望作为农药助剂在易光解农药中应用。

Bamboo vinegar has been used as a synergist in some pesticides. The effect of bamboo vinegar on photodegradation of azadirachtin A and prochloraz in water and on glass surface under high pressure mercury lamp （HPML） was studied. The？analysis？of？pesticides was performed using ultra-performance liquid chromatog- raphy （UPLC）. Results showed that bamboo vinegar exhibited photo-quenching effect on the photolysis of the pesticides. In the presence of the 10 times diluted solution of bamboo vinegar, the half-lives of prochloraz and azadirachtin A on the glass surface were 5.73 min and 4.13 rain, respectively. Their half-lives were significantly prolonged compared to the control groups. Additionally, the photolysis？of azadirachtin A and prochloraz in diluted bamboo vinegar？was prolonged for 2.4-fold？and 3.9-fold compared to those in？distilled water.？ As to azadirachtin A, the photoprotection？effect？of 30 times diluted solution of bamboo vinegar for azadirachtin A was equiva- lent？to？the？effect？of 57.45 mg·L-1 4-aminobenzoic acid （a kind of commercial light stabilizer）. Overall, bamboo vinegar can improve the photostability of pesticides in the aqueous solution or on the glass surface. Thus, bamboo vinegar could be a promising？candidate as a light stabilizer agent in pesticide formulations.