Extracellular polymeric substance

theoretical functions of soil EPS

Extracellular polymeric substances (EPS) are a group of substances exuded by microorganisms in order to form biofilms. The major components are extracellular polysacharides (also called EPS), protiens, DNA, enzymes, lipids, and other biopolymers. EPS accounts for 90% of biofilm drymass and constitutes the matrix of the biofilm. Biofilms are microhabitats that keep microbes attached to a substrate, provide protection from desiccation , and play a key role in nutrient cycling. Biofilms are also known to alter the structure , hydrology , and composition of soils.

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