Evaluation of β-galactosidase from Lactobacillus acidophilus as biocatalyst for galacto-oligosaccharides synthesis: Product structural characterization and enzyme immobilization
Journal Article
·
· Journal of Bioscience and Bioengineering
- Univ. of Belgrade, Belgrade (Serbia)
- INRA, Nantes (France)
- Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
β-Galactosidase is an important industrial enzyme that catalyzes reaction of lactose hydrolysis and recently more interesting reaction of transgalactosylation, yielding a highly valuable group of prebiotic compounds named galacto-oligosaccharides (GOS). In this paper, parameters for achieving high yields of tailor-made GOS using crude β-galactosidase obtained from Lactobacillus acidophilus ATCC 4356, probiotic bacteria regarded as safe for human consumption, were optimized. At the same time, detailed structural elucidation of obtained GOS was conducted, and it was concluded that β-galactosidase from L. acidophilus shows a particular specificity towards the formation of β-(1 → 6) glycosidic bonds. In order to develop more stable and economically cost-effective preparation, crude enzyme was successfully immobilized on a methacrylic polymer carrier Lifetech ECR8409, leading to its simultaneous 2-fold purification. In conclusion, this immobilized preparation showed unchanged specificity towards the transgalactosylation reaction, thus yielding 86 g/l GOS under the previously optimized conditions (lactose concentration 400 g/l in 0.1 M sodium phosphate buffer, pH 6.8 and temperature 50°C).
- Research Organization:
- Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
- Sponsoring Organization:
- USDOE
- Grant/Contract Number:
- AC05-76RL01830
- OSTI ID:
- 1459008
- Journal Information:
- Journal of Bioscience and Bioengineering, Journal Name: Journal of Bioscience and Bioengineering Journal Issue: 6 Vol. 126; ISSN 1389-1723
- Publisher:
- Society for Bioscience and Bioengineering, c/o Osaka University., Faculty of Engineering, Yamadaoka 2-1, Suita-shi, Osaka JapanCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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journal | September 2019 |
Whey valorization using transgalactosylation activity of immobilized β‐galactosidase
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journal | May 2019 |
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