Aguirre R, Hatchikian EC, Monsan P. Bidirectional measurement of hydrogenase activity by the pH-stat method.
Anal Biochem 1983;
131:525-9. [PMID:
6351666 DOI:
10.1016/0003-2697(83)90209-9]
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Abstract
The protons produced by the catalytic activity of hydrogenase in H2 evolution from dithionite-reduced methyl viologen or through benzyl viologen reduction by H2 gas are automatically titrated by a pH-stat device. This approach allows the measurement of hydrogenase activity and ensures the constancy of pH during the reaction in absence of buffers. Kinetic assays and pH and temperature-dependence experiments with Desulfovibrio gigas hydrogenase performed by this method basically confirm the results obtained with customary manometric assay.
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