Strategies for the production of high-content fructo-oligosaccharides through the removal of small saccharides by co-culture or successive fermentation with yeast

被引:51
作者
Nobre, C. [1 ,2 ]
Castro, C. C. [2 ]
Hantson, A. -L. [2 ]
Teixeira, J. A. [1 ]
De Weireld, G. [2 ]
Rodrigues, L. R. [1 ]
机构
[1] Univ Minho, Ctr Biol Engn, P-4710057 Braga, Portugal
[2] Univ Mons, Fac Polytech Mons, B-7000 Mons, Belgium
关键词
Fructo-oligosaccharides; Aureobasidium pullulans; Co-culture; Successive fermentation; Saccharomyces cerevisiae; MIXED-ENZYME-SYSTEM; HIGH-CONTENT FRUCTOOLIGOSACCHARIDES; BETA-FRUCTOFURANOSIDASE; GLUCOSE-OXIDASE; AUREOBASIDIUM-PULLULANS; ASPERGILLUS-JAPONICUS; PURIFICATION; FRUCTOSYLTRANSFERASE; STRAINS; SUCROSE;
D O I
10.1016/j.carbpol.2015.08.088
中图分类号
O69 [应用化学];
学科分类号
081704 ;
摘要
Fructo-oligosaccharides (FOS) obtained by fermentation of sucrose may be purified at large-scale by continuous chromatography (Simulated Moving Bed: SMB). In order to improve the efficiency of the subsequent SMB purification, the optimization of the fermentative broth composition in salts and sugars was investigated. Fermentations conducted at reduced amount of salts, using Aureobasidium pullulans whole cells, yielded 0.63 +/- 0.03 g of FOS per gram of initial sucrose. Additionally, a microbial treatment was proposed to reduce the amount of small saccharides in the mixture. Two approaches were evaluated, namely a co-culture of A. pullulans with Saccharomyces cerevisiae; and a two-step fermentation in which FOS were first synthesized byA. pullulans and then the small saccharides were metabolized by S. cerevisiae. Assays were performed in 100 mL shaken flasks and further scaled-up to a 3 L working volume bioreactor. Fermentations in two-step were found to be more efficient than the co-culture ones. FOS were obtained with a purity of 81.6 +/- 0.8% (w/w), on a dry weight basis, after the second-step fermentation with S. cerevisiae. The sucrose amount was reduced from 13.5 to 5.4% in total sugars, which suggests that FOS from this culture broth will be more efficiently separated by SMB. (C) 2015 Elsevier Ltd. All rights reserved.
引用
收藏
页码:274 / 281
页数:8
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