Photostability of bacteriochlorophyll „a“ and bacteriopheophytin „a“ against UV-A, UV-B and visible light treatments in methanol solutions

Chemia Naissensis Pub Date : 1900-01-01 DOI:10.46793/chemn2.2.082l

Aleksandar Lazarević, S. Petrović, D. Cvetković, L. Stanojević, Mirjana Cvijović, J. Zvezdanović

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Abstract

Bacteriochlorins as the porphyrins derivatives are well known photosensitizers with great potential for use in various fields of pharmacy and medicine. Photostability of selected bacteriochlorins, bacteriochlorophyll a and bacteriopheophytin a, in different methanol solutions (with and without lipids) during continual UV-A, UV-B and visible light treatments were studied using absorption UV-VIS spectroscopy providing kinetic analysis. Applied irradiation treatments resulted in irreversible degradation of both selected bacteriochlorins obeying the first order of kinetics. Bacteriopheophytin a showed significantly higher photostability in comparison to bacteriochlorophyll a for all applied irradiation treatments, for about one to three orders of magnitude. Photochemical degradation of bacteriochlorins is energy dependant process, governed by photons energy input.Lipid environment play stability role for both bacteriochlorins against all, UV-A, UV-B and visible light treatments. Bacteriopheophytin a induced lipid peroxidation processduring UV-A irradiation treatment.

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甲醇溶液中细菌叶绿素“a”和细菌叶绿素“a”对UV-A、UV-B和可见光处理的光稳定性

细菌氯作为卟啉衍生物是一种众所周知的光敏剂，在药学和医学的各个领域都有很大的应用潜力。采用紫外-可见光谱法研究了不同甲醇溶液(含脂和不含脂)中选定的细菌氯、细菌叶绿素a和细菌叶绿素a在连续UV-A、UV-B和可见光处理下的光稳定性。应用辐照处理导致两种选定的细菌氯的不可逆降解服从一级动力学。与细菌叶绿素a相比，在所有辐照处理中，细菌叶绿素a的光稳定性显著提高，约为1至3个数量级。细菌氯的光化学降解是一个能量依赖的过程，受光子能量输入的控制。脂质环境对细菌氯对所有UV-A、UV-B和可见光处理均起稳定作用。在UV-A照射处理中，细菌叶绿素a诱导脂质过氧化过程。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Chemia Naissensis

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