Abstract
A novel water soluble biopolymer metalloporphyrin complex (BSA-ZnTpHPP) was prepared by combination of insoluble meso-tetra(4-hydroxyphenyl) porphyrin zinc complex (ZnTpHPP) and bovine serum albumin (BSA). The complex was characterized by UV-Vis spectroscopy, circular dichroism, and native polyacrylamide gel electrophoresis. The secondary structure of BSA was maintained after coordination of the metalloporphyrin complex at a low ratio. The photosensitivity of BSA-ZnTpHPP was also investigated. Its fluorescence was quenched by methyl viologen (MV<sup>2+</sup>), which suggests that photo-induced electron transfer occurs from BSA-ZnTpHPP to MV<sup>2+</sup> in the BSA-ZnTpHPP/MV<sup>2+</sup>/triethanolamine (TEOA) system. Under light, BSA-ZnTpHPP was easily excited to the triplet state, and then transferred an electron to MV<sup>2+</sup>. The BSA-ZnTpHPP/MV<sup>2+</sup>/TEOA/colloidal Pt system was applied to photosensitized reduction of water for preparation of hydrogen. The water-soluble biopolymer metalloporphyrin complex was an excellent biopolymer photosensitizer.
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