Bioactive and technological properties of an α-D-glucan synthesized by Weissella cibaria PDER21

A slimy-mucinous-type colony of EPS-producing Weissella cibaria PDER21 was isolated and identified. The monomer composition was glucose, showing that the EPS is a glucan type homopolysaccharide, The core structure of (1 -> 6)-linked alpha-D-glucose units including (1 -> 3)-linked alpha-D-glucose branches at a ratio of 93.4/6.6 was revealed by H-1 and C-13 NMR spectra and confirmed by FTIR analysis. The glucan showed a superior thermal stability with almost no degradation in structure up to 300 degrees C. XRD analysis revealed the amorphous structure while SEM analysis confirmed the layer-like morphology. The glucan had an antioxidant activity (89.5%), water-holding capacity (103.7%) and water solubility index (80.7%) values, suggesting that the glucan had a strong level of antioxidant properties; good water binding capacity and excellent solubility. The glucan PDER21 is a polysaccharide possessing a good combination of technical and functional attributes, suggesting a great deal of potential for use in the food industry.

Automated summary

A slimy-mucinous-type colony of EPS-producing Weissella cibaria PDER21 was isolated and identified. The EPS was found to be a glucan type homopolysaccharide composed of glucose monomers. It exhibited superior thermal stability and antioxidant activity, as well as good water binding capacity and solubility. The findings suggest that the glucan PDER21 has great potential for use in the food industry.