orabase and hexamethylsilazane

Acetobacter xylinum produces highly crystalline cellulose extracellularly using glucose as a carbon source. The polymer formed is free of other biogenic compounds, separable in a simple way and characterized by its high water-absorption capacity. Stepwise solvent exchange from water to unpolar solvents leads to a drastic decrease of the water content of the bacterial cellulose without decrease of the highly swollen and activated state. Heterogeneous as well as homogeneous derivatizations, e.g. carboxymethylation, silylation and acetylation, were performed on the wet or dried biopolymer. Furthermore, different methods for formation of hollow fibres during biosynthesis were investigated. Such tubes may have applications as biocompatible material in medicine.

Topics: Absorption; Acetobacter; Acetylation; Alkylation; Biocompatible Materials; Biopolymers; Carbohydrate Conformation; Carboxymethylcellulose Sodium; Cellulose; Glucose; Industrial Microbiology; Methylation; Organosilicon Compounds; Spectrophotometry, Infrared; Trimethylsilyl Compounds; Water