Prebiotic effects of structurally identified galacto-oligosaccharides produced by β-galactosidase from Aspergillus oryzae


Novel galacto-oligosaccharides were produced by β-galactosidase from Aspergillus oryzae using lactose, and their structural characteristics and prebiotic effects were examined. Highly purified oligosaccharide fraction (HP) was prepared from a crude one (low purified, LP) by gel-filtration on Biogel P-2 column, which was further purified into S1 and S2 fractions by prep-HPLC. S1 and S2 were comprised of galactose (Gal) and glucose (Glc) in the ratio of 2 to 1. ESI-MS-MS and methylation analysis indicated that S1 and S2 were trisaccharides with structures of β-d-Galp-(1,6)-β-d-Galp-(1,4)-β-d-Glcp and β-d-Galp-(1,3)-β-d-Galp-(1,4)-β-d-Glcp, respectively. Herein, LP and HP were used as the carbon sources for determining the prebiotic activity score of probiotics including Lactobacillus and Bifidobacterium species. LP and HP at 1% and 2% (w/v) were observed at all positive scores on several probiotics, especially, B. infantis ATCC 15697 at the 2% level of HP (p<0.05). Consequently, structurally identified trisaccharides of HP can significantly enhance the growth of B. infantis.

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Correspondence to Kwang-Soon Shin.

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Kim, S.Y., Jeong, HS., Ahn, SW. et al. Prebiotic effects of structurally identified galacto-oligosaccharides produced by β-galactosidase from Aspergillus oryzae . Food Sci Biotechnol 23, 823–830 (2014).

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  • galacto-oligosaccharide
  • β-galactosidase
  • prebiotic activity score
  • probiotics
  • structural characteristics