Abstract
In this work, the influence of oxygen mass transfer rates on the production of cyclodextrin glycosyltransferase (CGTase) by the alkaliphilic bacterium Bacillus circulans ATCC 21783 was investigated. Experimental design and response surface methodology were applied to optimize agitation speed and air flow rate in batch cultivations, in order to identify their significant effects and interactions with the synthesis of CGTase. Results were expressed as the volumetric mass transfer rates of oxygen (kla, [per hour]). The maximal CGTase productivity of 155 U mL−1 h−1 was achieved with kla of 48 h−1. CGTase production was also studied in fed-batch cultures using the optimized parameters obtained in the batch experiments. The maximal CGTase productivity on fed-batch cultivations was 137 U mL−1 h−1 with feeding rates of starch at 0.17 g L−1 h−1.
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The authors wish to thank CAPES and CNPq for their financial support and scholarships for the first and fourth authors.
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Grants and financial support: CAPES and CNPq (Brazil).
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Pinto, F.S.T., Flôres, S.H., Schneider, C.E. et al. The Influence of Oxygen Volumetric Mass Transfer Rates on Cyclodextrin Glycosyltransferase Production by Alkaliphilic Bacillus circulans in Batch and Fed-Batch Cultivations. Food Bioprocess Technol 4, 559–565 (2011). https://doi.org/10.1007/s11947-009-0188-9
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DOI: https://doi.org/10.1007/s11947-009-0188-9