Production and properties of native agars from Gracilaria tikvahiae and other red algae

Native agars were extracted from a number of wild and cultured samples of Gracilaria spp., as well as two
samples of Pterocladia pinnata, and analyzed for gel strength, gelling and melting temperatures, sulfate
content, and 3,6-anhydrogalactose content. In addition, the amounts of polysaccharide extracted by hot
methanol, cold water, and boiling water were measured.