期刊
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
卷 60, 期 15, 页码 3940-3946出版社
AMER CHEMICAL SOC
DOI: 10.1021/jf300890d
关键词
Galacto-oligosaccharides; beta-galactosidase; biphasic system; transgalactosylation; metagenome
资金
- National Natural Science Foundation of China [31170117]
- National Marine Research Special Funds for Public Welfare Projects of China [201205020-07]
- Major Science and Technology Projects of Guangdong Province, China [2011A080403006]
- Science and Technology Plan Project of Guangdong Province [2010A080403005]
- National High Technology Research and Development Program of China (863 Program) [2007AA10Z308]
- Laboratory Sun Yat-sen University [YJ201027]
Prebiotic galacto-oligosaccharides (GOS) were effectively synthesized from lactose in organic-aqueous biphasic media by,a novel metagenome-derived beta-galactosidase BgaP412. A maximum GOS of 46.6% (w/w) was achieved with 75.4% lactose conversion rate in the cyclohexane/buffer system [95:5 (v/v) cyclohexane/buffer] under the optimum reaction conditions (initial lactose concentration = 30% (w/v), T = 50 degrees C, pH 7.0, and t = 8 h). The corresponding productivity of GOS was approximately 17.5 g L-1 h(-1). The GOS mixture consisted of tri-, tetra-, and pentasaccharides. Trisaccharides were the chief component of reaction products. These experimental results showed that a low water content, a high initial lactose concentration, and an elevated reaction temperature could significantly promote the transgalactosylation activity of beta-galactosidase BgaP412; at the same time, the enhanced GOS yield in an organic-aqueous biphasic system is because of the fact that thermodynamic equilibrium can be shifted to the synthetic direction by reversing the normal hydrolysis.
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