Efficient peroxide decoloration of azo dye catalyzed by polyethylene glycol-linked manganese chlorin derivative.
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 degrees 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.
Kondo
Masaharu
M
Department of Applied Chemistry, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya 466-8555, Japan.
Mitsui
Tatsuro
T
Ito
Shingo
S
Kondo
Yuji
Y
Ishigure
Syuichi
S
Dewa
Takehisa
T
Yamashita
Keiji
K
Nakamura
Junko
J
Oura
Ritsuko
R
Nango
Mamoru
M
D001391:Azo Compounds / Q000737:chemistry*; D001557:Benzenesulfonates; D002384:Catalysis; D002713:Chlorine / Q000737:chemistry*; D004396:Coloring Agents / Q000737:chemistry*; D006735:Horseradish Peroxidase / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D007093:Imidazoles / Q000737:chemistry; D008345:Manganese / Q000737:chemistry*; D017830:Octoxynol / Q000737:chemistry; D010545:Peroxides / Q000737:chemistry*; D011092:Polyethylene Glycols / Q000737:chemistry*
D001391:Azo Compounds; D001557:Benzenesulfonates; D004396:Coloring Agents; D007093:Imidazoles; D010545:Peroxides; D011092:Polyethylene Glycols; D008345:Manganese; D002713:Chlorine; C029899:imidazole; D017830:Octoxynol; D006735:Horseradish Peroxidase; C014722:2-naphthol orange