This document presents sulfated polysaccharides derived from renewable non-terrestrial plants exhibiting exceptional antimicrobial properties and characteristics, and a method of manufacturing the same. Any of various species of red algae, brown algae, and brown seaweed (marine microalgae and/or macroalgae) are known to contain a high level of sulfated polysaccharides with inherent antimicrobial properties, and can be used in various implementations.