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首页> 外文期刊>Bioprocess and Biosystems Engineering >Mass transfer characterization of gamma-aminobutyric acid production by Enterococcus faecium CFR 3003: encapsulation improves its survival under simulated gastro-intestinal conditions
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Mass transfer characterization of gamma-aminobutyric acid production by Enterococcus faecium CFR 3003: encapsulation improves its survival under simulated gastro-intestinal conditions

机译:粪肠球菌CFR 3003产生的γ-氨基丁酸的传质表征:在模拟胃肠道条件下包封可提高其存活率

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摘要

Gamma-aminobutyric acid (GABA) production by free and Ca-alginate encapsulated cells of Enterococcus faecium CFR 3003 was investigated. Mass transfer rates characterizing the GABA production process using encapsulated cells were investigated. Experiments were performed to investigate external film and internal pore diffusion mass transfer rates. The Damkohler and Thiele analysis provides a good description of external film and internal pore diffusion resistances, respectively. The experiments revealed that the external film effects could be neglected but the process is affected to the greater extent by internal mass transfer effects and was found to be the principal rate-controlling step. Protective effect of encapsulation on cell survivability was tested under digestive environment, when challenged to salivary α-amylase, simulated gastric fluid and intestinal fluid. Viability of encapsulated cells was significantly higher under simulated gastro-intestinal conditions and could produce higher GABA than those observed with free cells. The results indicate that the Ca-alginate encapsulated probiotics could effectively be delivered to the colonic site for effective inhibitory action.
机译:研究了粪肠球菌CFR 3003的游离和钙藻酸盐包封的细胞产生的γ-氨基丁酸(GABA)。研究了使用包囊细胞表征GABA生产过程的传质速率。进行实验以研究外部膜和内部孔扩散传质速率。 Damkohler和Thiele分析分别很好地描述了外部膜和内部孔的扩散阻力。实验表明,可以忽略外部膜效应,但是该过程在很大程度上受到内部传质效应的影响,被认为是主要的速率控制步骤。在唾液α-淀粉酶,模拟胃液和肠液刺激下,在消化环境下测试了包封对细胞存活率的保护作用。在模拟的胃肠道条件下,被囊化细胞的活力明显更高,并且与游离细胞相比,可以产生更高的GABA。结果表明,钙藻酸盐包封的益生菌可以有效地递送至结肠部位,以具有有效的抑制作用。

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