Identification and structural characterization of key prebiotic fraction of soluble dietary fiber from grapefruit peel sponge layer and its regulation effect on gut microbiota

被引:5
作者
Du, Xiaoyi [1 ]
Chen, Jiajia [1 ]
Hu, Tenggen [1 ]
Xu, Yujuan [1 ]
Wu, Jijun [1 ]
Peng, Jian [1 ]
Cheng, Lina [1 ]
Yu, Yuanshan [1 ]
Li, Lu [1 ]
机构
[1] Guangdong Acad Agr Sci, Sericultural & Argi Food Res Inst, Guangdong Key Lab Agr Prod Proc, Key Lab Funct Foods,Minist Agr & Rural Affairs, 133 Yiheng St,Dongguanzhuang Rd, Guangzhou 510610, Peoples R China
关键词
Grapefruit peel sponge layer; Key prebiotic fraction; Structure; POLYSACCHARIDES; FERMENTATION; ANTIOXIDANT;
D O I
10.1016/j.ijbiomac.2024.129274
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
In this study, the key prebiotic fraction of grapefruit peel sponge layer soluble dietary fiber (GSLSDF) was identified, and its structure characteristics and modulatory effect on intestinal microorganisms were investigated. Firstly, two fractions (GSLSDF-1 and GSLSDF-2) were isolated from GSLSDF, and the GSLSDF-1 showed a better prebiotic activity. Subsequently, GSLSDF-1 was found to have a low molecular weight and crystallinity, a loose and porous microstructure, and a high glucose content. Meanwhile, GSLSDF-1 was a dextran with a main chain linked by 8-1, 4 glycosidic bonds and branched by a 8-1, 6 glycosidic bonds. These structural characteristics were responsible for the favorable prebiotic activity of GSLSDF-1. Finally, the regulation effect of GSLSDF-1 on gut microbiota was analyzed in vitro fecal fermentation. Compared with the blank and GSLSDF groups, GSLSDF-1 could increase the relative abundances of Lactobacillus, Bacteroides, Bifidobacterium and Faecalibacterium coupled with decrease the relative abundances of Clostridium and Clostridioides. Furthermore, GSLSDF-1 promoted the production of short -chain fatty acids (SCFAs) by modulating the SCFAs synthesis pathway of intestinal microorganisms, while the NH3-N synthesis of intestinal microorganisms was inhibited by GSLSDF-1. Above results indicated that GSLSDF-1 was the key prebiotic fraction of GSLSDF, which could effectively optimize the intestinal microorganism composition.
引用
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页数:12
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