Optimisation of the synthesis of high galacto-oligosaccharides (GOS) from lactose with β-galactosidase from Kluyveromyces lactis

A rational optimisation for the synthesis of galacto-oligosaccharides (GOS) catalysed by a commercial β-galactosidase from Kluyveromyces lactis, Lactozym Pure 6500 L, is shown. The study of the main reaction parameters – temperature, enzyme concentration, pH, initial lactose concentration and reacti...

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Bibliographic Details
Published inInternational dairy journal Vol. 61; pp. 211 - 219
Main Authors González-Delgado, Isabel, López-Muñoz, María-José, Morales, Gabriel, Segura, Yolanda
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 01.10.2016
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Summary:A rational optimisation for the synthesis of galacto-oligosaccharides (GOS) catalysed by a commercial β-galactosidase from Kluyveromyces lactis, Lactozym Pure 6500 L, is shown. The study of the main reaction parameters – temperature, enzyme concentration, pH, initial lactose concentration and reaction time – using surface response methodology, was demonstrated to be an accurate tool to optimise empirical production of the most desired galacto-oligosaccharides (tri-GOS and tetra-GOS) with a higher presumed prebiotic effect. The optimal value for the yield towards these high-GOS predicted by the model was 12.18% at 40 °C, 5 U mL−1 enzyme concentration, pH 7.0, 250 g L−1 initial lactose concentration and 3 h of reaction. The pH was found to be a critical parameter affecting the transgalactosylation/hydrolysis enzyme activity ratio, and was used to tune the relative production of tri- or tetra-GOS.
ISSN:0958-6946
1879-0143
DOI:10.1016/j.idairyj.2016.06.007