利用低聚半乳糖双歧杆菌的筛选及益生特性研究
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(1.东北农业大学 乳品科学教育部重点实验室 哈尔滨 150030;2.东北农业大学食品学院 哈尔滨 150030;3.黑龙江省绿色食品科学研究院 哈尔滨 150028)

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黑龙江省重点研发计划项目(GA21B015);黑龙江省博士后科研启动金项目(LBH-Q2009)


Studies on Screening and Probiotic Characterization of Bifidobacteria with the Ability to Utilize Galacto-oligogalactosaccharides
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(1.Key Laboratory of Dairy Science, Ministry of Education, Northeast Agricultural University, Harbin 150030;2.College of Food Science, Northeast Agricultural University, Harbin 150030;3.Heilongjiang Green Food Science Research Institute, Harbin 150028)

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    摘要:

    短链低聚半乳糖(SC-GOS)是双歧杆菌的有效增殖因子。本试验从婴儿粪便样品中筛选得到7株高效利用SC-GOS的双歧杆菌,经16S rDNA鉴定,它们为1株为长双歧杆菌婴儿亚种BI_Y46,2株为两歧双歧杆菌(BB_Y22、BB_S7),2株假小链双歧杆菌(BP_Y43、BP_YA)以及2株长双歧杆菌(BL_S34、BL_H26)。以婴儿双歧杆菌M63和婴儿双歧杆菌ATCC 15697为对照,观察菌株形态并分析益生特性,初步筛选出具有应用潜力的益生菌株。结果表明,BI_Y46形态特殊,分叉状有菌毛;BB_Y22、BP_Y43的胞外多糖产量超过0.45 mg/mL;BL_H26菌体表面蛋白含量较高,为0.74 mg/mL,BB_Y22、BB_S7含量在0.35~0.45 mg/mL范围;同时BP_Y43、BB_Y22具有较强的表面疏水性和自聚集能力;在模拟胃液中及胆盐存在下,BB_Y22、BI_Y46对胆盐和胃液的刺激显示出较强的耐受性。抑菌试验显示BI_Y46、BB_S7上清液对大肠杆菌ATCC 25922的抑菌效果较强。结论:长双歧杆菌婴儿亚种BI_Y46、两歧双歧杆菌BB_Y22以及假小链双歧杆菌BP_Y43具有较好的益生潜力,为开发含有低聚半乳糖和双歧杆菌的产品提供一定参考。

    Abstract:

    Short chain-galactooligosaccharides (SC-GOS) is an effective proliferation factor of Bifidobacteria. Seven strains of Bifidobacteria with high utilization of SC-GOS were screened from infant fecal samples, the result of 16S rDNA identification was that one was Bifidobacterium longum subsp. infantis BI_Y46, 2 B. pseudocatenulatum (BP_Y43, BP_YA), 2 B. bifidum (BB_Y22, BB_S7) and 2 strains of B. longum (BL_S34, BL_H26). Compared with B. infantis M63 and B. infantis ATCC 15697, the morphology of the strains was observed and the probiotic characteristics were analyzed. Thus, the probiotics with application potential were screened. The results showed that BI_Y46 had special morphology with bifurcated fimbriae, and the exopolysaccharide yield of BB_Y22 and BP_Y43 was higher than 0.45 mg/mL. The surface protein content of BL_H26 was (0.74±0.07) mg/mL, the content of BB_S7 and BB_Y22 was between 0.35-0.45 mg/mL. Whereas, BP_Y43 and BB_Y22 had strong surface hydrophobicity and self-aggregation ability. BB_Y22 and BI_Y46 showed strong tolerance to the stimulation of bile salt and gastric juice. The supernatant of BI_Y46 and BB_S7 had strong inhibiting effect on Escherichia coli ATCC 25922. In summary, B. infantis BI_Y46, B. bifidum BB_Y22 and B. pseudocatenulatum BP_Y43 had good probiotic potential and provide some reference for the development of products containing galactoseoligosaccharides and Bifidobacterium.

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孙慧,肖利红,何明雪,徐梓赫,谭泽,张峰瑞,张莉丽,韩建春.利用低聚半乳糖双歧杆菌的筛选及益生特性研究[J].中国食品学报,2023,23(11):36-45

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  • 收稿日期:2022-11-04
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  • 在线发布日期: 2023-12-14
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