食品科学

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魔芋葡甘聚糖及其衍生物肠道益生性的体外发酵评价

秦清娟1,邓 利1,徐小青1,王小燕1,钟 耕1,2,3,*   

  1. 1.西南大学食品科学学院,重庆 400716;2.西南大学 食品科学与工程国家级本科实验教学示范中心,重庆 400716;
    3.重庆市特色食品工程技术研究中心,重庆 400716
  • 出版日期:2015-08-15 发布日期:2015-08-17

Evaluation of Prebiotic Functions of Konjac Glucomannan and Its Derivatives by Fermentation in vitro

QIN Qingjuan1, DENG Li1, XU Xiaoqing1, WANG Xiaoyan1, ZHONG Geng1,2,3,*   

  1. 1. College of Food Science, Southwest University, Chongqing 400716, China; 2. National Undergraduate Experiment Teaching
    Demonstration Center of Food Science and Engineering, Southwest University, Chongqing 400716, China;
    3. Chongqing Special Food Engineering Technology Research Center, Chongqing 400716, China
  • Online:2015-08-15 Published:2015-08-17

摘要:

目的:评价魔芋葡甘聚糖(konjac glucomannan,KGM)及其衍生物脱乙酰基魔芋葡甘聚糖(D-KGM)、魔芋葡甘露低聚糖(konjac oligosaccharide,KOS)的肠道益生性。方法:分别以1 g/100 mL的KGM、KOS和D-KGM为碳源,通过小鼠盲肠内容物体外厌氧发酵,测定发酵液的pH值、微生物和短链脂肪酸,评价肠道益生效果。结果:与阳性对照组(以葡萄糖作为碳源)相比,KGM和KOS发酵液pH值明显降低,短链脂肪酸(short-chainfatty acids,SCFAs)和乳酸菌、双歧杆菌的数量显著增加,肠道潜在致病菌(大肠杆菌、梭状杆菌、拟杆菌)的增殖不明显,而D-KGM发酵液中pH值、肠道微生物、SCFAs与阴性对照组(不含碳源)均无显著性差异。结论:KOS和KGM具有显著的肠道益生性,而D-KGM没有肠道益生性。

关键词: 魔芋葡甘聚糖, 魔芋葡甘低聚糖, 脱乙酰基魔芋葡甘聚糖, 肠道益生性, 体外发酵

Abstract:

Objective: To evaluate the prebiotic functions of konjac glucomannan (KGM), konjac oligosaccharides, and
deacetyled konjac glucomannan (D-KGM) in the intestine. Methods: Anaerobic fermentation in vitro with the fresh mouse
cecum contents was carried out using 1 g/100 mL KGM, KOS and D-KGM as carbon sources, respectively. The pH,
bacterial enumeration, and short-chain fatty acids (SCFAs) of the fermented broth were measured. Results: Compared
with the positive control (with GLU as carbon source), the pH of the fermented broths with KGM and KOS was much
lower. Meanwhile, SCFAs, lactobacilli and bifidobacteria increased significantly, while the potentially pathogenic bacteria
(Escherichia coli, Bacterium fusiformis and Bacteroidetes) did not change obviously. The broth of D-KGM presented no
obvious difference compared with the negative control (without carbon source). Conclusion: The prebiotic functions of
KGM and KOS are conspicuous, but D-KGM has no prebiotic function.

Key words: konjac glucomannan (KGM), konjac oligosaccharides (KOS), deacetyled konjac glucomannan (D-KGM);prebiotic function, fermentation in vitro

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