The thermochemical characterization of sodium dithionite, flavin mononucleotide, flavin-adenine dinucleotide and methyl and benzyl viologens as low-potential reductants for biological systems

摘要

pThe heat of reaction (ΔiH/i) of Fe(CN)sub6/subsup3?/sup, Methyl Viologen, FMN and FAD with Ssub2/subOsub4/subsup2?/sup in aqueous buffer solutions was measured calorimetrically. In addition ΔiH/i values for reduction of Fe(CN)63-, FMN and FAD by reduced Methyl Viologen were determined. The resulting calorimetric data and corresponding iE/isub0/subsup′/sup values were combined to yield thermodynamic data for these simple reducing agents in a form useful for applications to biological reactions. Thermodynamic data for the reduction of spinach ferredoxin are also presented./p