Lipase immobilization on differently functionalized vinyl-based amphiphilic polymers: Influence of phase segregation on the enzyme hydrolytic activity

Mariangela Bellusci, Iolanda Francolini, Andrea Martinelli, Lucio D'Ilario, Antonella Piozzi

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21 Citations (Scopus)

Abstract

Microbial lipase from Candida rugosa was immobilized by physical adsorption onto an ethylene-vinyl alcohol polymer (EVAL) functionalized with acyl chlorides. To evaluate the influence of the reagent chain-length on the amount and activity of immobilized lipase, three differently long aliphatic fatty acids were employed (C8, C12, C18), obtaining EVAL functionalization degrees ranging from 5% to 65%. The enzyme-polymer affinity increased with both the length of the alkyl chain and the matrix hydrophobicity. In particular, the esterified polymers showed a tendency to give segregated hydrophilic and hydrophobic domains. It was observed the formation of an enzyme multilayer at both low and high protein concentrations. Desorption experiments showed that Candida rugosa lipase may be adsorbed in a closed form on the polymer hydrophilic domains and in an open, active structure on the hydrophobic ones.The best results were found for the EVAL-C18 13% matrix that showed hyperactivation with both the soluble and unsoluble substrate after enzyme desorption. In addition, this supported biocatalyst retained its activity for repetitive cycles. © 2012 American Chemical Society.
Original languageEnglish
Pages (from-to)805 - 813
Number of pages9
JournalBiomacromolecules
Volume13
Issue number3
DOIs
Publication statusPublished - 12 Mar 2012
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Bioengineering
  • Biomaterials
  • Polymers and Plastics
  • Materials Chemistry

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