Purification, characterization and antioxidant activity of dextran produced by Leuconostoc pseudomesenteroides from homemade wine. (15th October 2018)

• Record Type: Journal Article
• Authors: Du, Renpeng; Qiao, Xiaoxiao; Zhao, Fangkun; Song, Qiaozhi; Zhou, Qingqing; Wang, Yu; Pan, Lei; Han, Ye; Zhou, Zhijiang
• Is Part Of: Carbohydrate polymers. Volume 198(2018)
• Page Start: 529
• Page End: 536
• Publication Date: 2018-10-15
• Subjects: Leuconostoc pseudomesenteroides dextran -- Purification -- Characterization -- Structural analysis -- Antioxidant activity; Polysaccharides -- Periodicals; Polysaccharides -- Periodicals; Polysaccharides -- Périodiques; Electronic journals; 547.78
• DOI: 10.1016/j.carbpol.2018.06.116
• Languages: English
• ISSNs: 0144-8617

Abstract

Highlights: An exopolysaccharide was produced by Leuconostoc pseudomesenteroides DRP-5. The exopolysaccharide was a highly linear dextran. The dextran showed moderate antioxidant activity in vitro experiments. The dextran has an excellent potential for use in the food industry. Abstract: An exopolysaccharide (EPS) was produced by Leuconostoc pseudomesenteroides DRP-5 isolated from homemade wine. The EPS was obtained with ethanol extraction, which was further purified by chromatography of Sephadex G-100 to get a purified fraction. The monosaccharide composition of the EPS was glucose, and its molecular weight (Mw) was 6.23 × 10 6 Da, as determined by gas chromatography (GC) and high-performance size-exclusion chromatography (HPSEC). Fourier transform infrared spectra (FT-IR) and nuclear magnetic resonance spectra (NMR) showed that the EPS was a linear glucan with α-(1→6)-linked glucosidic bonds. The water holding capacity (WHC), water solubility index (WSI) and emulsifying activity (EA) of DRP-5 EPS were 296.76 ± 18.93%, 98.62 ± 3.57% and 87.22 ± 2.18%, respectively. DRP-5 EPS have a higher degradation temperature of 278.36 °C, suggesting high thermal stability of the EPS. Also, DRP-5 EPS was found to have moderate 1, 1-diphenyl-2-picrylhydrazyl (DPPH) radical, hydroxyl radical, superoxide anion radical, 2, 2'-Azinobis-(3-ethylbenzthiazoline-6-sulphonate) (ABTS) radical, Fe 2+ scavenging activities and reducing power. All these characteristics suggest that DRP-5 EPS might have potential applications in the pharmaceutical, cosmetic and food industries.