Key factors affecting photoactivated fungicidal activity of sodium pheophorbide a against Pestalotiopsis neglecta,Pesticide Biochemistry and Physiology

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Key factors affecting photoactivated fungicidal activity of sodium pheophorbide a against Pestalotiopsis neglecta
Pesticide Biochemistry and Physiology ( IF 4.2 ) Pub Date : 2020-04-01 , DOI: 10.1016/j.pestbp.2020.104584
Jing Yang ₁ , Bo-Wen Zhang ₂ , Lian-Nan Lin ₃ , Xiao-Li Zan ₄ , Guo-Cai Zhang ₁ , Guang-Sheng Chen ₂ , Jing-Yu Ji ₁ , Wei-Hu Ma ₁

Affiliation

Recently, photodynamic therapy (PDT) and photoactivated pesticides have attracted considerable research attention. In the present study, we aimed to investigate the photodynamic activity of a chlorophyllous derivative, sodium pheophorbide a (SPA), and to evaluate its potential as a photoactivated fungicide. The singlet oxygen quantum yield, the photoreaction process, the anti-photobleaching ability in sterile water (H2O), the effect of light conditions on its antifungal activity, and its stability were all investigated. SPA showed significant fungicidal activity and photostability, during which Type I and Type II photodynamic reactions occurred simultaneously on Pestalotiopsis neglecta, and the influence of Type I was slightly larger than that of Type II. In addition, light promoted the antifungal activity of SPA. In particular, the antifungal activity was enhanced with increasing light intensity, and was strongest under 8000 lx conditions. Under monochromatic light sources, antifungal activity was strongest under green light s; however, the effect of monochromatic light was not as good as that of white light. From 0 to 24 h, the antifungal effect of the SPA solution was enhanced; however, the activity of the solution began to weaken after 24 h. Furthermore, our study confirmed that the antifungal activity of SPA was stable under different temperatures, pH values, and UV irradiation durations.

中文翻译：

影响脱镁叶绿素a光活化杀菌活性的关键因素

最近，光动力疗法（PDT）和光活化农药引起了相当多的研究关注。在本研究中，我们旨在研究叶绿素衍生物脱镁叶绿素 a (SPA) 的光动力活性，并评估其作为光活化杀菌剂的潜力。研究了单线态氧量子产率、光反应过程、无菌水（H2O）中的抗光漂白能力、光照条件对其抗真菌活性的影响及其稳定性。SPA显示出显着的杀真菌活性和光稳定性，在此期间对圆叶绿藻同时发生I型和II型光动力反应，I型的影响略大于II型。此外，光促进了SPA的抗真菌活性。特别是，抗真菌活性随着光照强度的增加而增强，并且在 8000 lx 条件下最强。在单色光源下，绿光下抗真菌活性最强；然而，单色光的效果不如白光。0～24 h，SPA溶液的抗真菌作用增强；然而，溶液的活性在 24 小时后开始减弱。此外，我们的研究证实，SPA 的抗真菌活性在不同温度、pH 值和紫外线照射持续时间下是稳定的。SPA溶液的抗真菌作用增强；然而，溶液的活性在 24 小时后开始减弱。此外，我们的研究证实，SPA 的抗真菌活性在不同温度、pH 值和紫外线照射持续时间下是稳定的。SPA溶液的抗真菌作用增强；然而，溶液的活性在 24 小时后开始减弱。此外，我们的研究证实，SPA 的抗真菌活性在不同温度、pH 值和紫外线照射持续时间下是稳定的。

更新日期：2020-04-01

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