Abstract
A novel method was developed for the immobilization of Saccharomyces cerevisiae invertase within supermacroporous polyacrylamide cryogel and was used to produce invert sugar. First, the cross-linking of invertase with soluble polyglutaraldehyde (PGA) was carried out prior to immobilization in order to increase the bulkiness of invertase and thus preventing the leakage of the cross-linked enzyme after immobilization by entrapment. And then, in situ immobilization of PGA cross-linked invertase within cryogel synthesis was achieved by free radical polymerization in semi-frozen state. The method resulted in 100 % immobilization and 74 % activity yields. The immobilized invertase retained all the initial activity for 30 days and 30 batch reactions. Immobilization had no effect on optimum temperature and it was 60 °C for both free and immobilized enzyme. However, optimum pH was affected upon immobilization. Optimum pH values for free and immobilized enzyme were 4.5 and 5.0, respectively. The immobilized enzyme was more stable than the free enzyme at high pH and temperatures. The kinetic parameters for free and immobilized invertase were also determined. The newly developed method is simple yet effective and could be used for the immobilization of some other enzymes and microorganisms.
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The authors would like to thank the Gebze Institute of Technology Research Foundation for financial support (Project No: 2012-A-10).
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Olcer, Z., Ozmen, M.M., Sahin, Z.M. et al. Highly Efficient Method Towards In Situ Immobilization of Invertase Using Cryogelation. Appl Biochem Biotechnol 171, 2142–2152 (2013). https://doi.org/10.1007/s12010-013-0507-5
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DOI: https://doi.org/10.1007/s12010-013-0507-5