These tools will no longer be maintained as of December 31, 2024. Archived website can be found here. PubMed4Hh GitHub repository can be found here. Contact NLM Customer Service if you have questions.


Pubmed for Handhelds

PUBMED FOR HANDHELDS

Search MEDLINE/PubMed

  • Title: Immobilization of enzymes on spongy polyvinyl alcohol cryogels: the example of beta-galactosidase from Aspergillus oryzae.
    Author: Rossi A, Morana A, Lernia ID, Di tombrino A, De Rosa M.
    Journal: Ital J Biochem; 1999 Jun; 48(2):91-7. PubMed ID: 10434188.
    Abstract:
    The catalytic properties of a beta-galactosidase from Aspergillus oryzae, entrapped into a spongy polyvinyl alcohol cryogel, were studied. This polymeric matrix was selected because of its mild conditions of preparation and its stability, biocompatibility, structural strength and diffusive properties. The enzyme was entrapped, in high percentage, into cryogel sponges and its activity and kinetic parameters were determined and compared with those of the free enzyme, using as substrates o-nitrophenyl-beta-galactopyranoside (ONPG) or lactose. The immobilized enzyme showed a reduced activity with ONPG and lactose, probably because of substrate diffusion limitations through the matrix, but it was more stable to temperature, pH and ionic strength than the free enzyme. Lactose hydrolysis under continuous experimental conditions was performed using the matrix-enzyme cited above.
    [Abstract] [Full Text] [Related] [New Search]