Characteristics of Bacterial Cellulose Obtained from Acetobacter Xylinum Culture for Application in Papermaking
2008; Index Copernicus International S.A.; Linguagem: Inglês
ISSN
2300-7354
AutoresBarbara Surma-Ślusarska, Sebastian Presler, Dariusz Danielewicz,
Tópico(s)Advanced Theoretical and Applied Studies in Material Sciences and Geometry
ResumoIn this paper, a method of cultivation and characteristics of obtained bacterial cellulose is presented. It was stated that the greatest increase in the weight of bacterial cellulose takes place after 7 - 8 days of breeding Acetobacter xylinum at a temperature of 30 °C, using a Herstin-Schramm nutrient medium. The highest degree of polymerisation exists in bacterial cellulose synthesied with glucose and mannitol average degree of polymerisation (approx 1700), and xylose (approx. 1050), as a carbon source. In the photograph showing the structure of cellulose (taken under an AFM microscope), one can clearly see long, smooth and oriented fibrils and fibril bundles which have a width varying from 70 to 200 nm. Bacterial cellulose exhibits considerable thermal stability. The quick drop of a sample weight leading to its decomposition begins at a temperature of approx. 300 °C, and the maximum of this transformation occurs at 350 - 370 °C.
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