Encapsulation of combi-cleas of glycosidases in alginate beads and polyvinyl alcohol for wine aroma enhancement

Luigi Tavernini, CARLA VERONICA ABURTO GAJARDO, OSCAR ENRIQUE ROMERO ORMAZABAL, Andrés Illanes, LORENA EVELYN WILSON SOTO

Research output: Contribution to journalArticlepeer-review

Abstract

The aromatic expression of wines can be enhanced by the addition of specific glycosidases, although their poor stability remains a limitation. Coimmobilization of glycosidases as cross-linked enzyme aggregates (combi-CLEAs) offers a simple solution yielding highly stable biocatalysts. Nevertheless, the small particle size of combi-CLEAs hinders their recovery, preventing their industrial application. Encapsulation of combi-CLEAs of glycosidases in alginate beads and in polyvinyl alcohol is proposed as a solution. Combi-CLEAS of β-D-glucosidase and α-L-arabinofuranosidase were prepared and encapsulated. The effects of combi-CLEA loading and particle size on the expressed specific activity (IU/gbiocatalyst ) of the biocatalysts were evaluated. Best results were obtained with 2.6 mm diameter polyvinyl alcohol particles at a loading of 60 mgcombi-CLEA/gpolyvinyl alcohol, exhibiting activities of 1.9 and 1.0 IU/gbiocatalyst for β-D-glucosidase and α-L-arabinofuranosidase, respectively. Afterwards, the stability of the biocatalysts was tested in white wine. All the encapsulated biocatalysts retained full activity after 140 incubation days, outperforming both free enzymes and nonencapsulated combi-CLEAs. Nevertheless, the alginate-encapsulated biocatalysts showed a brittle consistency, making recovery unfeasible. Conversely, the polyvinyl-encapsulated biocatalyst remained intact throughout the assay. The encapsulation of combi-CLEAs in polyvinyl alcohol proved to be a simple methodology that allows their recovery and reuse to harness their full catalytic potential.

Original languageEnglish
Article number866
JournalCatalysts
Volume11
Issue number7
DOIs
StatePublished - Jul 2021
Externally publishedYes

Keywords

  • Alginate
  • Combi-CLEAs
  • Glycosidases
  • Polyvinyl alcohol
  • Wine aroma

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