Resorufin as an electron acceptor in glucose oxidase-catalyzed oxidation of glucose.
Resorufin (1) has been found to act as an electron acceptor in glucose oxidase (GOD)-catalyzed oxidation of glucose. When a 1: 1: 1 mixture of solutions of 1 (5.0 microM), glucose, and GOD (4.0 mg/ml) in phosphate buffer (pH 7.4, 0.1 M) was incubated at 36 degrees C under aerobic conditions and the reaction was followed by a measurement of changes in fluorescence intensity due to 1, only two types of fluorometric traces were observed: (1) when a glucose solution of less than 0.7 mM was subjected to the enzymatic reaction, no consumption of 1 was observed; (2) the reaction with glucose at more than 1.0 mM always consumed 1, affording a regression fluorometric curve, and yet the obtained fluorometric traces could be almost superimposed on one another with no dependence on the glucose concentration. The reasons for the observed phenomena are discussed.
Graduate School of Pharmaceutical Sciences, Osaka University, Suita, Japan. h-maeda@phs.osaka-u.ac.jp
H
H
Maeda
S
S
Matsu-ura
T
T
Senba
S
S
Yamasaki
H
H
Takai
Y
Y
Yamauchi
H
H
Ohmori
D002384:Catalysis; D003124:Colorimetry; D004583:Electrons; D005947:Glucose / Q000378:metabolism*; D005949:Glucose Oxidase / Q000378:metabolism*; D007202:Indicators and Reagents / Q000737:chemistry; D010078:Oxazines / Q000737:chemistry*; D010084:Oxidation-Reduction
D007202:Indicators and Reagents; D010078:Oxazines; C014180:resorufin; D005949:Glucose Oxidase; D005947:Glucose