 EPSs constitute 50% to 90% of a biofilm's total organic matter.Exopolysaccharides (also sometimes abbreviated EPSs) are high-molecular-weight polymers that are composed of sugar residues and are secreted by a microorganism into the surrounding environment.Microorganisms synthesize a wide spectrum of multifunctional polysaccharides including intracellular polysaccharides, structural polysaccharides and extracellular polysaccharides or exopolysaccharides.