RESUMO
This study aimed at providing a route towards the production of a novel exopolysaccharide (EPS) from fermented bamboo shoot-isolated Lactobacillus fermentum. A lactic acid bacteria strain, with high EPS production ability, was isolated from fermented bamboo shoots. This strain, R-49757, was identified in the BCCM/LMG Bacteria Collection, Ghent University, Belgium by the phenylalanyl-tRNA synthetase gene sequencing method, and it was named Lb. fermentum MC3. The molecular mass of the EPS measured via gel permeation chromatography was found to be 9.85 × 104 Da. Moreover, the monosaccharide composition in the EPS was analyzed by gas chromatography-mass spectrometry. Consequently, the EPS was discovered to be a heteropolysaccharide with the appearance of two main sugars-D-glucose and D-mannose-in the backbone. The results of one-dimensional (1D) and two-dimensional (2D) nuclear magnetic resonance spectroscopy analyses prove the repeating unit of this polysaccharide to be [â6)-ß-D-Glcp-(1â3)-ß-D-Manp-(1â6)-ß-D-Glcp-(1â]n, which appears to be a new EPS. The obtained results open up an avenue for the production of novel EPSs for biomedical applications.
RESUMO
This study aims at producing exopolysaccharides (EPS) from a lactic acid bacterial strain. The soybean whey-isolated Lactobacillus plantarum W1 (EPS-W1), which belongs to genus Lactobacillus, is identified using the phenylalanyl-tRNA sequencing method. Of all the examined strains, R-49778 (as numbered by BCCM/LMG Bacteria Collection, Ghent University, Belgium) showed the highest capability of producing exopolysaccharides. Structural characterization revealed a novel exopolysaccharide consisting of repeating units of â6)-d-Glcp-(1â; â3)-d-Manp-(1â; â3)-d-Glcp-(1â and a branch of â6)-d-Manp-(1â; â2)-d-Glcp-(1â. This discovery opens up avenues for the production of EPS for food industries, functional foods, and biomedical applications.
