Immobilization of β-galactosidase in glutaraldehyde-chitosan and its application to the synthesis of lactulose using cheese whey as feedstock

[Display omitted] •Reactional parameters influence the lactulose synthesis by β-galactosidase.•Immobilization increased the stability of β-galactosidase enzyme.•β-galactosidase from K. lactis is more stable in the presence of some ions.•A biocatalyst composed of β-galactosidase immobilized on chitos...

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