Hydrogenases colloidal

In practice, however, although there is a small driving force for this reaction at pH 7, which increases with decreasing pH, a catalyst, usually colloidal Pt, Pt02 or hydrogenase, is required to promote the oxidation of MVf by H+ (see Section 61.5.4.4). 

Finally, as an alternative to colloidal metal particles it is possible to use hydrogenase,133,153 186 187-200,202,238"248 normally from Desulphovibrio vulgaris, or a synthetic analogue derived from Fe4S4 clusters248 in the presence of bovine serum albumin, as the redox catalyst for production of hydrogen from MVf and protons. 

The simplest use of micelles is in the solubilization of hydrophobic species and early experiments showed that [ZnTPP] in TritonX-100 micelles could act as a cliromophore in the photochemical reduction of MV2+ by ethanethiol or TEOA. Hydrogen was produced if hydrogenase or colloidal Pt were added.331 Zinc porphyrins in neutral micelles (TritonX-100) produce332 hydrogen on photolysis in the presence of TEOA, bipy and K2[PtCl6J. 

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