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Non-carrier immobilization of yeast cells by genipin crosslinking for the synthesis of prebiotic galactooligosaccharides from plant-derived galactose.
Xuan, Zehui; Wang, Ke; Duan, Feiyu; Lu, Lili.
Afiliación
  • Xuan Z; School of Pharmacy, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China.
  • Wang K; School of Pharmacy, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China.
  • Duan F; School of Pharmacy, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China.
  • Lu L; School of Pharmacy, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China. Electronic address: lililu@hust.edu.cn.
Int J Biol Macromol ; : 133991, 2024 Jul 20.
Article en En | MEDLINE | ID: mdl-39089904
ABSTRACT
Galactooligosaccharides (GOS), as mimics of human milk oligosaccharides, are important prebiotics for modulating the ecological balance of intestinal microbiota. A novel carrier-free cell immobilization method was established using genipin to cross-link Kluyveromyces lactis CGMCC 2.1494, which produced ß-galactosidase, an enzyme essential for GOS synthesis. The resulting immobilized cells were characterized as stable by thermogravimetric analysis and confirmed to be crosslinked through scanning electron microscopy analysis (SEM) and Fourier transform infrared spectroscopy (FTIR). The Km and Vmax values of ß-galactosidase in immobilized cells towards o-nitrophenyl ß-D-galactoside were determined to be 3.446 mM and 2210 µmol min-1 g-1, respectively. The enzyme in the immobilized showed higher thermal and organic solvent tolerance compared to that in free cells. The immobilized cells were subsequently employed for GOS synthesis using plant-derived galactose as the substrate. The synthetic reaction conditions were optimized through both single-factor experiments and response surface methodology, resulting in a high yield of 49.1 %. Moreover, the immobilized cells showed good reusability and could be reused for at least 20 batches of GOS synthesis, with the enzyme activity remaining above 70 % at 35 °C.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Int J Biol Macromol Año: 2024 Tipo del documento: Article País de afiliación: China

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Int J Biol Macromol Año: 2024 Tipo del documento: Article País de afiliación: China