Department of Chemistry and Biochemistry, Stephen F. Austin State University, Nacogdoches, TX.
Photochem Photobiol. 2019 May;95(3):823-832. doi: 10.1111/php.13050. Epub 2018 Dec 5.
Here, we report an experimental study of the effect of toxic metal ions on photosensitized singlet oxygen generation for photodegradation of PAH derivatives, Anthracene-9,10-dipropionic acid disodium salt (ADPA) and 1,5-dihydroxynapthalene (DHN) and photoinactivation of Escherichia coli bacteria by using cationic meso-tetra(N-methyl-4-pyridyl)porphine tetrachloride (TMPyP) as a singlet oxygen photosensitizer. Three s-block metals ions, such as Na , K and Ca and five toxic metals such as Cd , Cu , Hg , Zn and Pb were studied. The s-block metal ions showed no change in the rate of photodegradation of ADPA or DHN by TMPyP, whereas a dramatic change in the photodegradation of ADPA and DHN was observed in the presence of toxic metals. The maximum photodegradation rate constants of ADPA and DHN were observed for Cd ions [(3.91 ± 0.20) × 10 s and (7.18 ± 0.35) × 10 s , respectively]. Strikingly, the photodegradation of ADPA and DHN was almost completely inhibited in the presence of Hg ions and Cu ions. A complete inhibition of growth of E. coli was observed upon visible light irradiation of E. coli solutions with TMPyP and toxic metal ions particularly, Cd , Hg , Zn and Pb ions, except for Cu ions where a significantly slow inhibition of E. coli's growth was observed.
在这里，我们报告了一项关于毒性金属离子对光解多环芳烃衍生物蒽-9,10-二丙酸二钠盐（ADPA）和 1,5-二羟基萘（DHN）的光致敏单重态氧生成的影响的实验研究，并使用阳离子介体-四（N-甲基-4-吡啶基）卟啉四氯（TMPyP）作为单重态氧光敏剂研究了铜绿假单胞菌的光灭活。研究了三种 s 区金属离子，如 Na 、K 和 Ca，以及五种毒性金属，如 Cd 、Cu 、Hg 、Zn 和 Pb。s 区金属离子对 TMPyP 光解 ADPA 或 DHN 的速率没有变化，但在存在毒性金属的情况下，ADPA 和 DHN 的光解发生了显著变化。ADPA 和 DHN 的最大光降解速率常数分别观察到 Cd 离子[(3.91 ± 0.20) × 10 s 和 (7.18 ± 0.35) × 10 s]。引人注目的是，ADPA 和 DHN 的光降解在 Hg 离子和 Cu 离子存在下几乎完全被抑制。当 TMPyP 和毒性金属离子，特别是 Cd 、Hg 、Zn 和 Pb 离子存在时，用可见光照射含有 TMPyP 和毒性金属离子的铜绿假单胞菌溶液时，观察到铜绿假单胞菌的生长完全被抑制，除了 Cu 离子，其观察到铜绿假单胞菌的生长受到显著抑制。
