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[目的]那他霉素作为抗真菌剂具有广谱、高效、安全、不易获得抗性的优点,但其在紫外光下容易降解的弱点限制了它在田间的应用,通过添加光稳定剂可提高它的光稳定性。[方法]以水为药剂和光稳定剂的载体,采用抑菌圈法和盆栽法测定光稳定剂对药剂稳定性的影响。[结果]紫外吸收剂UV-234、UV-531、UV-1164和光屏蔽剂SiO2有抑制那他霉素光解的作用,其中紫外吸收剂的效果优于SiO2,在一定时间内可显著抑制光解;自由基捕获剂T-123和抗氧剂1010没有任何作用;30 mg/L那他霉素分别与3种紫外吸收剂(3 g/L)混用防治番茄灰霉病的效果可达72.9%～78.1%,而单用30 g/L那他霉素的防效仅为35.2%。[结论]适宜的紫外吸收剂可显著提高那他霉素的光稳定性,提高防治番茄灰霉病的效果。
[Objective] Natamycin, as an antifungal agent, has the advantages of broad spectrum, high efficiency, safety and not easy to obtain resistance. However, the weakness of its easy degradation in ultraviolet light limits its application in the field. By adding light stabilizer Improve its light stability. [Method] The effect of light stabilizer on the stability of medicament was determined by inhibition zone method and pot culture method using water as carrier and photostabilizer. [Result] UV absorbers UV-234, UV-531, UV-1164 and SiO2 were used to inhibit the photodegradation of natamycin. UV absorbers were better than SiO2 and could significantly inhibit light over a certain period of time The free radical scavenger T-123 and antioxidant 1010 had no effect. The effect of 30 mg / L natamycin and 3 UV absorbers (3 g / L) % To 78.1% compared to 35.2% for 30 mg / L natamycin alone. [Conclusion] The suitable UV absorbers could significantly increase the photostabilities of natamycin and improve the control of tomato gray mold disease.