Analysis of Chemical Structure and Antibiofilm Properties of Exopolysaccharides from EIR/IF-1 Postbiotics

Overview

Journal Microorganisms

Specialty Microbiology

Date 2022 Nov 11

PMID 36363792

Authors

Basar Karaca

Ozan Haliscelik

Mervi Gursoy

Fadime Kiran

Vuokko Loimaranta

Eva Soderling

Ulvi Kahraman Gursoy

Affiliations

Soon will be listed here.

Abstract

Previous studies have indicated that the exopolysaccharides of lactic acid bacteria exhibit antibiofilm activity against non-oral bacteria by preventing their initial adhesion to surfaces and by downregulating the expression of genes responsible for their biofilm formation. The aims of this study were to (1) characterize the exopolysaccharides (EPSs) of EIR/IF-1 postbiotics, (2) test their antibiofilm effect on dual biofilms, and (3) evaluate their bacterial auto-aggregation, co-aggregation, and hydrocarbon-binding inhibitory activity. The EPSs were characterized by FTIR, HPLC, and thermogravimetric analysis. Bacterial auto- and co-aggregation were tested by Kolenbrander's method and hydrocarbon binding was tested by Rosenberg's method. Dual biofilms were formed by culturing ATCC 25586 with one of the following bacteria: ATCC 33185, AHN 33266, ATCC 33277, AHN 24155, and ATCC 35896. The EPSs contained fractions with different molecular weights (51 and 841 kDa) and monosaccharides of glucose, galactose, and fructose. The EPSs showed antibiofilm activity in all the biofilm models tested. The EPSs may have inhibited bacterial aggregation and binding to hydrocarbons by reducing bacterial hydrophobicity. In conclusion, the EPSs of EIR/IF-1, which consists of two major fractions, exhibited antibiofilm activity against oral bacteria, which can be explained by the inhibitory effect of EPSs on the auto-aggregation and co-aggregation of bacteria and their binding to hydrocarbons.

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