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.
journal_name
Appl Microbiol Biotechnoljournal_title
Applied microbiology and biotechnologyauthors
Shakeri M,Shoda Mdoi
10.1007/s00253-007-1042-5subject
Has Abstractpub_date
2007-09-01 00:00:00pages
919-26issue
4eissn
0175-7598issn
1432-0614journal_volume
76pub_type
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