Simultaneous synthesis and purification (SSP) of galacto-oligosaccharides in batch operation

CARLA VERONICA ABURTO GAJARDO, CECILIA ANDREA GUERRERO SIANCAS, Carlos Vera, Lorena Wilson, Andrés Illanes

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14 Scopus citations

Abstract

The production of prebiotic galacto-oligosaccharides (GOS) considers the enzymatic synthesis by lactose transgalactosylation and the purification from the reacted mixture (raw GOS). Simultaneous synthesis and purification of GOS (SSP) was conducted in a one-pot operation using β-galactosidase from Aspergillus oryzae and Saccharomyces cerevisiae or Kluyveromyces marxianus cells, allowing the selective removal of unwanted carbohydrates (monosaccharides and lactose). The reaction was carried out in a stirred reactor at 40 °C, pH 4.5 and 200 rpm, using lactose without additional supplements, evaluating the effect of yeast genus (S. cerevisiae or K. marxianus), enzyme-substrate ratio (20-400 IUH/g lactose), initial lactose concentration (20-50% w/w) and substrate mass-biomass ratio (0.05-0.4). The best GOS yield was obtained with S. cerevisiae at 50 IUH/g lactose and 0.25 g cell biomass/g carbohydrates. These conditions were used for scaling-up into a bioreactor (1000 g of 40% w/w lactose) operated under temperature and pH control at an aeration rate of 5 vvm, obtaining a GOS yield of 40% at 24 h of reaction, which is significantly higher than obtained in the conventional system of GOS synthesis. SSP may represent a technological advantage in terms of productivity and yield of GOS production.

Original languageEnglish
Pages (from-to)81-89
Number of pages9
JournalLWT - Food Science and Technology
Volume72
DOIs
StatePublished - 1 Oct 2016

Keywords

  • Galacto-oligosaccharides
  • Prebiotic
  • Simultaneous synthesis and purification
  • Yeasts
  • β-galactosidase

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