Repeated-batch operation for the synthesis of lactulose with β-galactosidase immobilized by aggregation and crosslinking

CECILIA ANDREA GUERRERO SIANCAS, Carlos Vera, Erick Araya, RAUL JORGE CONEJEROS RISCO, Andrés Illanes

Research output: Contribution to journalArticlepeer-review

31 Scopus citations

Abstract

Synthesis of lactulose under repeated-batch operation was done with cross-linked aggregates of Aspergillus oryzae β-galactosidase (CLAGs). The effect of the crosslinking agent to enzyme mass ratio and cross-linking time were first evaluated. Best results were obtained at 5.5gdeglutaraldehyde/g enzyme at 5h of cross-linking, obtaining a specific activity of 15,000IUg-1, with 30% immobilization yield. CLAG was more stable than the free enzyme under non-reactive conditions with a half-life of 123h at 50°C and when operated in repeated-batch mode, yield and productivity was 3.8 and 4.3 times higher. Maximum number of batches was determined considering biocatalyst replacement at 50% residual activity. 98 and 27 batches could be performed under such criterion at fructose/lactose molar ratio of 4 and 20 respectively, reflecting that enzyme stability is strongly affected by the sugars distribution in the reaction medium.

Original languageEnglish
Pages (from-to)122-131
Number of pages10
JournalBioresource Technology
Volume190
DOIs
StatePublished - 1 Aug 2015

Keywords

  • Enzymatic synthesis
  • Immobilized enzyme
  • Lactulose
  • Repeated-batch
  • β-Galactosidase

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