Summary
Some physical factors including initial pH of medium, cultivation temperature and shaking speed as well as reuse affecting the production of cholesterol oxidase (CholOx) in reactors containing calcium alginate-immobilized cells of Rhodococcus equi No. 23 were investigated. Results revealed that the free cells showed the maximum CholOx in the culture with an initial pH of 5.0, while culture inoculated with immobilized cells exhibited a broad pH range, 6.0–9.0, for maximum CholOx production. The immobilized and free cells produced the maximum CholOx in the culture incubated at 30 and 25°C, respectively. The CholOx production decreased upon increasing the cultivation temperature. Increasing CholOx activity was also noted for both immobilized and free cells of R. equi No. 23 in the culture with increasing shaking speed. Under the optimal culture conditions, that were established, a higher maximum CholOx production of 0.94 unit/ml was found for immobilized R. equi No. 23 compared to that of 0.84 unit/ml for free cells after 48 h of cultivation. Furthermore, no gel leakage was noted after re-use of the calcium alginate-immobilized R. equi No. 23 for seven consecutive 48 h batch culture. The CholOx production in the seventh cycle was about 60.4% of that obtained in the first cycle.
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Chang, YC., Yu, RC., Yang, HY. et al. Physical Factors and Reuse Affect the Production of Cholesterol Oxidase in Reactors Containing Calcium Alginate-Immobilized Rhodococcus equi No. 23. World J Microbiol Biotechnol 21, 1129–1134 (2005). https://doi.org/10.1007/s11274-005-0081-2
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DOI: https://doi.org/10.1007/s11274-005-0081-2