Exopolysaccharide produced by potential probiotic Enterococcus faecium MS79: Characterization, bioactivities and rheological properties influenced by salt and pH
Document Type
Article
Publication Date
9-1-2020
Abstract
Microbial exopolysaccharide (EPS) is of interest due to their applications in food processing and potential health benefits following consumption. The objectives of this study were to: 1) isolate, purify and characterize EPS produced by Enterococcus faecium MS79 (EPS-MS79); 2) investigate bioactive properties of EPS-MS79; and 3) investigate the rheological properties of the EPS-MS79 as influenced by salt type and pH level. The average molecular weight of the EPS-MS79 was 8.3 x 10(5) Da and it is composed of the three monosaccharides arabinose, mannose, and glucose in a molar ratio of 0.8:1.7:11.3. Scavenging activities of EPS-MS79 were 76% and 85% as measured by DPPH and 26% and 44% as measured by ABTS. The antiproliferative activities against colon (72% and 77%) and breast (43% and 56%) cancer cell lines. EPS-MS79 inhibited the growth of bacterial pathogens by up to 3 logs compared to the control. All EPS-MS79 solutions displayed shear thinning behavior. The storage and loss moduli of all EPS-MS79 solutions increased alongside with the frequency increase. Salt type and pH level impacted on the rheological properties of EPS-MS79. The EPS-MS79 could be a potent prebiotic promoting health and rheological properties of foods.
Keywords
Antidiabetic, Anticancer, Apparent viscosity, Probiotic, Thixotropic
Divisions
InstituteofBiologicalSciences
Funders
United Arab Emirates University (Grant No. 31F135, G00003248)
Publication Title
LWT-Food Science and Technology
Volume
131
Publisher
Elsevier
Publisher Location
RADARWEG 29, 1043 NX AMSTERDAM, NETHERLANDS