Efficient peroxide decoloration of azo dye catalyzed by polyethylene glycol-linked manganese chlorin derivative |
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Authors: | Kondo Masaharu Mitsui Tatsuro Ito Shingo Kondo Yuji Ishigure Syuichi Dewa Takehisa Yamashita Keiji Nakamura Junko Oura Ritsuko Nango Mamoru |
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Affiliation: | aDepartment of Applied Chemistry, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya 466-8555, Japan;bDepartment of Human Environments, Faculty of Human Sciences, Osaka University of Human Sciences, 1-4-1 Shojaku, Settu, Osaka 566-8501, Japan |
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Abstract: | We reported here that polyethylene glycol (PEG)-linked manganese pyrochlorophyllide a (PEG-MnPChlide a) possesses remarkable catalytic activity comparable to horseradish peroxidase (HRP). The PEG-MnPChlide a catalyzed the oxidation decoloration reaction of C.I. Acid Orange 7 by hydrogen peroxide under a mild aqueous condition, pH 8.0 at 25 °C. The manganese pyrochlorophyride a methylester (MnPChlide a ME) dissolved in a Triton X-100 micellar solution also exhibited the catalytic activity, indicating the micellar environment plays an important role in the catalytic reaction. The reaction rate was accelerated by addition of imidazole. The catalytic reactions were analyzed by Michaelis–Menten kinetics, revealing that the higher reactivity of catalyst–substrate complex is responsible for the present catalytic reaction system. |
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Keywords: | Manganese chlorin derivative Amphipathic polymer Oxidation catalyst Azo dye Enzyme-like catalytic reaction |
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