Abstract
Cells of the Pseudomonas fluorescens strain C2 containing nitrilase and Rhodococcus ruber strain gt1 with nitrile hydratase activity have been immobilized by the use of adsorption on fibrous carbon materials. It has been shown that the maximum adsorption value of Rhodococcus cells is higher than that in pseudomonades, reaching 21 mg of dry cells/1 g of the carrier vs. 6 mg, respectively. Cell adsorption, compared to cell suspension, gives a significant rise in nitrilase activity (by 7.4 times, using Ural TM-4 as the carrier) and in the stability of nitrile hydratase activity (5 reaction cycles without loss of activity, using Carbopon-B-active). Immobilized biocatalysts were also obtained by cell growth from Ps. fluorescens strain C2 and Rhodococcus ruber strain gt1 on fibrous carbon adsorbents. Biocatalyst productivity was higher for both strains when the carbonized material Ural TM-4 was used as the carrier.
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