Insights into the Viscoelastic Peculiarities of Cyanobacterial Extracellular Polymeric Substance (EPS)

Abstract

Extracellular polymeric substances (EPSs) can be de ned as renewable, high molecular weight polymeric materials produced by bacteria and microorganisms. EPSs are composed of primarily polysaccharides and proteins, with minor amounts of nucleic acids, lipids, and humic substances. Cyanobacterial extracellular polymeric subtances have a signi cant physiological effect on bloom formation and stress tolerance in adverse conditions. Therefore, cyanobacterial EPS has an important factor for aquatic life, environment and human life. For these reasons, determining the structure and structure-property relationships of cyanobacterial EPS is important for understanding its behavior and performance. In this study, the identi cation of the structure-property relationships, thermal and viscoelastic properties of cyanobacterial extracellular polymeric substance, X-ray diffraction (XRD) analysis, differential thermal analysis (DTA) and dynamic mechanical analysis (DMA) have been performed. Viscoelastic properties of the polymeric materias have been interpreted by certain DMA parameters at a xed frequency depending on the temperature to understand the performance of cyanobacterial EPS.

Response Mechanism of Extracellular Polymeric Substances Synthesized by Alternaria sp. on Drought Stress in Alfalfa (Medicago sativa L.)

“…Extracellular polymeric substances (EPS) are high molecular mass substances secreted by microorganisms during their growth, primarily composed of polysaccharides, proteins, lipids and nucleic acids . They are mainly composed of large molecules synthesized via intracellular or extracellular pathways and have numerous biological activities to act as antioxidants, agents of water retention, ion chelators, and anti-inflammatory agents. − Moreover, EPS can be degraded by soil microorganisms.…”