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Immobilization of the β-galactosidase fromAspergillus niger on chitosan

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Abstract

Crude or purifiedAspergillus niger β-galactosidase preparations were immobilized on chitosan (deacetylated chitin, activated with glutaraldehyde). The most active immobilized systems were obtained withcrude enzyme preparations. The immobilized enzyme hydrolyzed lactose in pure lactose solutions, ultrafiltrate whey permeates, or acid wheys at similar rates. The pH activity profiles and Km values of the chitosan-bound enzyme were not significantly altered on immobilization, and its stability on repetitive use up to 60°C was increased by reduction with NaBH4. After 8 weeks on discontinuous operation (8 h use per day), β-galactosidase-chitosan columns were found to retain about 90, 50, or 60% of their initial activities with lactose, ultrafiltrate permeate, or acid whey solutions, respectively. The efficiency of the β-galactosidase-chitosan conjugate appears to be comparable or greater than those of other described systems, and its stability should allow its use on an industrial scale. A preliminary report of this work has already been presented at the 4th International Enzyme Engineering Conference (September 25-30, 1977, Bad Neuenahr, FRG).

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Authors and Affiliations

  1. Research Department, Nestle Products Technical Assistance Co. Ltd., P.O.B. 88, CH-1814, La Tour-de-Peilz, Switzerland

    Jean-Louis Leuba & FrançOis Widmer

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  1. Jean-Louis Leuba
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  2. FrançOis Widmer
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Leuba, JL., Widmer, F. Immobilization of the β-galactosidase fromAspergillus niger on chitosan. Journal of Solid-Phase Biochemistry 2, 257–271 (1977). https://doi.org/10.1007/BF02996747

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