1. Glycerol-driven adaptive evolution for the production of low-molecular-weight Welan gum: Characterization and activity evaluation.
- Author
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Wang Y, Gao M, Zhu S, Li Z, Zhang T, Jiang Y, Zhu L, and Zhan X
- Subjects
- Polysaccharides, Bacterial chemistry, Polysaccharides, Bacterial pharmacology, Viscosity, Prebiotics, Bifidobacterium metabolism, Glycerol chemistry, Glycerol metabolism, Molecular Weight, Antioxidants chemistry, Antioxidants pharmacology, Sphingomonas metabolism, Fermentation
- Abstract
Through adaptive laboratory evolution (ALE) of Sphingomonas sp. ATCC 31555, fermentation for production of low-molecular-weight welan gum (LMW-WG) was performed using glycerol as sole carbon source. During ALE, GPC-MALS analysis revealed a gradual decrease in WG molecular weight with the increase of adaptation cycles, accompanied by changes in solution conformation. LMW-WG was purified and structurally analyzed using GPC-MALS, monosaccharide composition analysis, infrared spectroscopy, NMR analysis, atomic force microscopy, and scanning electron microscopy. Subsequently, LMW-WG obtains hydration, transparency, antioxidant activity, and rheological properties. Finally, an in vitro simulation colon reactor was used to evaluate potential prebiotic properties of LMW-WG as dietary fiber. Compared with WG produced using sucrose as substrate, LMW-WG exhibited a fourfold reduction in molecular weight while maintaining moderate viscosity. Structurally, L-Rha nearly completely replaced L-Man. Furthermore, LMW-WG demonstrated excellent hydration, antioxidant activity, and high transparency. It also exhibited resistance to saliva and gastrointestinal digestion, showcasing a favorable colonization effect on Bifidobacterium, making it a promising symbiotic agent., Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2024 Elsevier Ltd. All rights reserved.)
- Published
- 2024
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