A water-soluble arabinoxylan from Chinese liquor distillers' grains: Structural characterization and anti-colitic properties

粘蛋白 化学 食品科学 木糖 丁酸盐 细菌 多糖 结肠炎 生物化学 阿拉伯木聚糖 生物 发酵 免疫学 遗传学
作者
Hao Cui,Xia Li,Jiayi Que,Shuyue Li,Xiaodan Shi,Tao Yuan
出处
期刊:International Journal of Biological Macromolecules [Elsevier]
卷期号:266: 131186-131186 被引量:2
标识
DOI:10.1016/j.ijbiomac.2024.131186
摘要

Chinese liquor distillers' grain (CLDG) is a valuable and abundant by-product from traditional Chinese baijiu production, containing a diverse array of bioactive components that have attracted significant interest. Herein, a water-soluble polysaccharide, DGPS-2B, with a weight-average molecular weight of 37.3 kDa, was isolated from the alkali-extract fraction of CLDG. Methylation and NMR analysis identified that the primary constituents of DGPS-2B are arabinoxylans, with an arabinose-to-xylose ratio of 0.66. In an animal model of colitis, DGPS-2B treatment significantly altered the gut microbiota composition by increasing the SCFA-producing bacteria (e.g., Butyricicoccus) and reducing the mucin-degrading bacteria such as Muribaculaceae. This microbial shift resulted in elevated production of butyrate, acetate, and propionate, which subsequently suppressed NF-κB signaling, decreased the levels of IL-1β, IL-6, and TNFα, and potentially inactivated Notch signaling. These multifaceted effects stimulated mucin 2 production, reduced inflammation and apoptosis in the gut epithelium, and ultimately alleviated colitis symptoms. Collectively, this study not only elucidates the purification and characterization of DGPS-2B from CLDG but also illuminates its anti-colitic properties and the underlying molecular mechanisms. These findings underscore the potential of DGPS-2B as a therapeutic intervention for managing inflammatory bowel disease and emphasize CLDG as a promising source for developing value-added products.
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