Journal
JOURNAL OF MOLECULAR CATALYSIS B-ENZYMATIC
Volume 97, Issue -, Pages 209-214Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.molcatb.2013.08.020
Keywords
Formate dehydrogenase; Cross-linked enzyme aggregate; Optimization; CO2 reduction
Funding
- Korea CCS R&D Center (KCRC) grant [2013M1A8A1038187]
- National Research Foundation of Korea [2013M1A8A1038187] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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We employed a cross-linked enzyme aggregate (CLEA) method to immobilize formate dehydrogenase (FDH) from Candida boidinii. The optimal conditions for the preparation of CLEAs were determined by examining effects of various parameters: the nature and amount of cross-linking reagent, additive concentration, cross-linking time, and pH during CLEA preparation. The recovered activities of CLEAs were significantly dependent on the concentration of glutaraldehyde; however, the recovered activity was not severely influenced by the content of dextran polyaldehyde as a mild cross-linker. Bovine serum albumin (BSA) was also used as a proteic feeder and enhanced the activity recovery by 130%. The highest recovered activity of CLEA was 18% for formate oxidation reaction and 25% for CO2 reduction reaction. The residual activity of CLEA prepared with dextran polyaldehyde (Dex-CLEA) was over 95% after 10 cycles of reuse. The thermal stability of Dex-CLEA was increased by a factor of 3.6 more than that of the free enzyme. CLEAs of FDH could be utilized efficiently for both NADH regeneration and CO2 reduction. (C) 2013 Elsevier B.V. All rights reserved.
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