Reduction of Azo Food Dyes in Cultures ofProteus vulgaris
- 1 January 1975
- journal article
- research article
- Published by Taylor & Francis in Xenobiotica
- Vol. 5 (9) , 563-571
- https://doi.org/10.3109/00498257509056126
Abstract
1. Rates of reduction of a number of azo food dyes were measured in anaerobic cultures of Proteus vulgaris. The rates of colour loss were found to be zero order under conditions in which the concentration of viable cells remained constant. 2. A significant increase in the rate of reduction followed the onset of cell mortality. 3. The zero-order rates correlate with the redox potentials of the dyes. A mechanism consistent with these observations involves an extracellular nonenzymic reducing agent which acts as an electron shuttle between dye and cellular reducing enzymes.Keywords
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