ABSTRACT
The gum is a complex microbial polysaccharide derived from the bacterial coat of Xanthomonas campestris; glucose, sucrose, or lactose fermentation by the bacteria could cause production. The remarkable properties of xanthan gum make it an attractive polymer for different industrial and biological purposes. It is a linear polysaccharide extracellularly produced by several species of yeast, specifically by Aureobasidium pullulans. Its long chain consists of maltotriose units connected with each other by a glycosidic bond. Pullulan has many uses as an industrial plastic, in the food industry. Polyglycolic acid is a simplest linear, aliphatic, thermoplastic, biodegradable polymer, produced through polycondensation or ring-opening polymerization of glycolic acid monomer molecule. Though it is considered as a tough fiber-forming polymer, the hydrolytic instability due to the presence of ester linkage in the backbone, it has limited use. It is biodegradable thermoplastic polyester produced through chemical synthesis of low melting point crude oil.
