Composites with photosensitive 5,10,15,20-tetrakis(N-methylpyridinium-4-yl)porphyrin entrapped into silica gels

被引：0
作者：
Renata Rychtarikova
Stanislav Sabata
Jiri Hetflejs
Gabriela Kuncova
机构：
[1] Academy of Sciences,Institute of Chemical Process Fundamentals
来源：
Journal of Sol-Gel Science and Technology | 2012年 / 61卷
关键词：
Sol–gel; Photosensitizer; Immobilization; Photodynamic inactivation; Surfactant;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
Photosensitive cationic 5,10,15,20-tetrakis(1-methyl-4-pyridinio)porphyrin (TMPyP) was entrapped into microporous silica gels prepared by sol–gel method from tetrakis(2-hydroxyethoxy)silane (THES) and tetramethoxysilane (TMOS), resp., using different water and PEG 600 contents in the initial mixture. The absorption spectra of both composites showed that incorporation of TMPyP has led to a bathochomic shift (ca. 8 nm) of the Soret band and to a decrease in their molar absorption coefficient compared to TMPyP in solution. The TMPyP encapsulation kept the molecular state of the porphyrin in the free-base monomer form. In comparison to TMOS analogs, THES composites showed prolonged shape stability at least for 3 months, one-order higher rate of chemical substrate photooxidation and higher photobiocidal activity against E. coli.
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页码：119 / 125
页数：6
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