Purification and characterization of an exopolysaccharide from Leuconostoc lactis L2.
Int J Biol Macromol
; 139: 1224-1231, 2019 Oct 15.
Article
en En
| MEDLINE
| ID: mdl-31421168
An exopolysaccharide (EPS)-producing bacterium was isolated from the homemade fermentation product of hami melon (Cucumis melo var. saccharinus) and identified as Leuconostoc lactis L2 mainly based on 16S rDNA sequence analysis and the API 50 CHL test. The monosaccharide composition of Leu. lactis L2 EPS was determined to be glucose by gas chromatography (GC), and its molecular weight was 3.7â¯×â¯103â¯kDa by high-performance size exclusion chromatography (HPSEC). The EPS microscopic characteristics were compact, branched and tubular under scanning electron microscopy (SEM). Atomic force microscopy (AFM) showed a smooth and consistent polymeric matrix. The EPS was a linear polymer composed of α-(1â¯ââ¯6)-linked D-pyranose residues, based on the Fourier transform infrared (FT-IR), 1H, 13C nuclear magnetic resonance (NMR) and heteronuclear single quantum coherence (HSQC) spectra. This EPS exhibited a high water solubility index (WSI) and water holding capacity (WHC) (91.90⯱â¯2.45% and 509.45⯱â¯28.59%, respectively), as well as good emulsifying properties with many organic solvents. These results collectively suggest the applicable potential of this EPS in the food, feed and pharmaceutical fields.
Palabras clave
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Polisacáridos Bacterianos
/
Leuconostoc
Tipo de estudio:
Prognostic_studies
Idioma:
En
Revista:
Int J Biol Macromol
Año:
2019
Tipo del documento:
Article
Pais de publicación:
Países Bajos