具有一定分子量分布的黑莓多糖具有良好的生物活性。在这项研究中,用3种不同分子量的黑莓多糖观察2型糖尿病小鼠的降血糖作用,BBP(603.59kDa),BBP-8(408.13kDa)和BBP-24(247.62kDa),通过肠道微生物群调节。黑莓多糖降解后表现出较强的降血糖活性,和BBP的FBG,BBP-8和BBP-24降低至20.21±4.17mmolL-1,20.6±7.23mmolL-1和17.32±6.59mmolL-1,OGTT-AUC降低14.76%,19.80%和25.04%,分别,经过8周的干预。此外,16SrRNA基因测序分析表明,BBP-8和BBP-24可以重塑肠道菌群的多样性和组成。从0到4周,BBP的F/B,BBP-8和BBP-24减少了56.44%,47.19%和62.04%,在第8周达到3.39、6.54和3.11,分别,这表明BBP-24的利用率更快。此外,3种黑莓多糖的干预增加了目标有益菌螺旋体和拟杆菌的相对丰度,降低了病原菌的相对丰度。总的来说,结果表明,较低分子量的黑莓多糖更容易发酵,为开发黑莓多糖作为益生菌食品快速调节2型糖尿病肠道菌群奠定理论基础。
Blackberry polysaccharides with certain molecular weight distribution have good bioactivity. In this research, type 2 diabetes mice were used to investigate the hypoglycemic effect of blackberry polysaccharides with three different molecular weights, BBP (603.59 kDa), BBP-8 (408.13 kDa) and BBP-24 (247.62 kDa), through gut microbiota modulation. Blackberry polysaccharides exhibited stronger hypoglycemic activity after degradation, and the FBG of BBP, BBP-8 and BBP-24 was reduced to 20.21 ± 4.17 mmol L-1, 20.6 ± 7.23 mmol L-1 and 17.32 ± 6.59 mmol L-1 and OGTT-AUC was reduced by 14.76%, 19.80% and 25.04%, respectively, after 8-week intervention. Furthermore, 16S rRNA gene sequencing analysis indicated that BBP, BBP-8 and BBP-24 could reshape the diversity and composition of the gut microbiota. From 0 to 4 weeks, the F/B of BBP, BBP-8 and BBP-24 reduced by 56.44%, 47.19% and 62.04%, reaching 3.39, 6.54, and 3.11 in the 8th week, respectively, which suggested the faster utilization of BBP-24. Moreover, the intervention the three blackberry polysaccharides increased the relative abundance of the targeted beneficial bacteria Oscillospira and Bacteroidaceae Bacteroides and decreased the relative abundance of the pathogenic bacterium Allobaculum. In general, the result demonstrated that blackberry polysaccharides with a lower molecular weight are more easily fermented, making the theoretical basis for the development of blackberry polysaccharides as a probiotic food to rapidly regulate intestinal flora for type 2 diabetes.