Change in turnover capacity of crude recombinant dye-decolorizing peroxidase (rDyP) in batch and fed-batch decolorization of Remazol Brilliant Blue R.

Abstract:

:Decolorization of the representative anthraquinone dye, Remazol Brilliant Blue R (RBBR) was assessed to determine the practical potential of crude recombinant dye-decolorizing peroxidase generated by Aspergillus oryzae (rDyP) in term of turnover capacity of rDyP. The turnover capacity, defined as the milligram of RBBR decolorized per unit of rDyP inactivated over the catalytic life time of rDyP, was quantified under condition by H(2)O(2) -mediated rDyP inactivation. In batch culture, equimolar batch addition of H(2)O(2) and RBBR yielded complete decolorization of RBBR by rDyP, with a turnover capacity of 4.75. In stepwise fed-batch addition of H(2)O(2), the turnover capacity increased to 5.76, and by increasing dye concentration, it reached 14.3. When H(2)O(2) was added in continuous fed-batch to minimize rDyP inactivation and 1.6 mM dye was added in stepwise fed-batch mode, the turnover capacity increased to 20.4. At this turnover capacity, 1 l of crude rDyP solution containing 5,000 U could decolorize up to 102 g RBBR in 650 min.

authors

Shakeri M,Shoda M

doi

10.1007/s00253-007-1042-5

subject

Has Abstract

pub_date

2007-09-01 00:00:00

pages

919-26

issue

4

eissn

0175-7598

issn

1432-0614

journal_volume

76

pub_type

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