Microorganisms produce extracellular polymeric substances (EPS) which have diverse industrial applications, especially those from cyanobacteria due to their complexity.
The study examined how different culture media affect the quantity and composition of EPS in the cyanobacterium Synechocystis sp. PCC 6803, finding that early growth phases yield more EPS per cell, but overall amounts accumulate later.
Results indicated that lower magnesium boosts production per cell but reduces total sugar content, and specific sugars correlate with media components; a potential biosynthetic pathway and protective function for xylose-rich EPS were proposed based on RNA sequencing.