Application of a computer-controlled flow analyser to the determination of glucose and to the study of β -galactosidase activity

Abstract

Glucose was determined using an automated flow analyser and a commercial reagent preparation based on the glucose oxidaseperoxidase reaction. The coupling system for the hydrogen peroxide liberated consisted of 4-aminophenazone and 2,4-dichlorophenol. The analyser demonstrated linearity of>0.9997 for five consecutive sets of standards. The average RSD for individual standards is 0.76%, and a sample throughput rate of >80 h^-1 was achieved.

The study of β-galactosidase, using a novel substrate, was carried out in a simple single-line manifold. The enzyme-substrate reaction mixture was injected into a pH 10 buffer carrier to stop the reaction, and at the same time, propel the reaction zone to the flow cell. K_m and V_max values were calculated.

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