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Improved Photobactericidal Activity of Ultraviolet-A Light in Combination with Isomerizable p-Coumaric Acid Derivatives

机译:与可异构化的 p -香豆酸衍生物组合使用可提高紫外线A光的杀菌活性

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In order to improve the photobactericidal activity of ultraviolet-A (UV-A) mediated by reactive oxygen species (ROS), the present study focused on trans -coumaric acid (trans -CA), which is isomerized by UV-A. Generation of ROS was expected during the isomerization of trans -CA. Trans -CA derivatives, in which the carboxyl group was modified with a methyl, n -butyl or phenyl group, thereby changing the interaction with the cellular membrane by quenching the anionic properties of the carboxyl group and changing the UV adsorption properties, were used. The photobactericidal activities of trans -CA derivatives were evaluated by using UV-A light (wavelength 350 to 385 nm). The number of surviving Escherichia coli NBRC12713 was determined by colony-forming assay. Derivative 4c, which was esterified with a phenyl group, reduced survival by more than 5.0-log at a dose of 7.4 J/cm~(2) and by 3.2-log at a dose of 4.9 J/cm~(2). This synergistic activity may have been caused by the absorption of photon energy from UV-A, which is attributable to the UV spectrum of 4c. The photobactericidal activity was comparable to that of riboflavin, a known photo-activated agent. Isomerized molecules serve as a promising lead for improving the photobactericidal activity of UV-A by activating molecule-mediated ROS generation.
机译:为了提高由活性氧(ROS)介导的UV-A(UV-A)的光杀菌活性,本研究集中于被反式异构化的反式香豆酸(反式-CA)。 UV-A。在反式-CA的异构化过程中预期产生ROS。反式-CA衍生物,其中羧基被甲基,正丁基或苯基改性,从而通过淬灭羧基的阴离子性质并改变紫外线来改变与细胞膜的相互作用使用了吸附性能。通过使用UV-A光(波长350至385nm)评估反式-CA衍生物的光杀菌活性。通过菌落形成测定法确定存活的大肠杆菌NBRC12713的数目。被苯基酯化的衍生物4c在7.4 J / cm〜(2)的剂量下存活率降低了5.0对数以上,在4.9 J / cm〜(2)的剂量下降低了3.2对数。这种协同活性可能是由于从UV-A吸收了光子能量而引起的,这归因于4c的UV光谱。其光杀菌活性与核黄素(一种已知的光活化剂)相当。异构化的分子通过激活分子介导的ROS生成,成为改善UV-A的光杀菌活性的有前途的先导。

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