بعض خصائص السيليلوز المنتج من بكتريا A. xylinum

الملخص EN

Ribbons width, thickness and diameter of cellulose membrance and its ability to water holding as important properties of cellulose produced by A.

xylinum FEA 48 were studied.

It was found that the bacterial cellulose had highest crystallinity index and high biodegradability by Aspergillus cellulases.

The results showed that it is possible to modify bacterial cellulose during microbial synthesis through the addition of suitable modifier to the culture medium.

The modification of bacterial cellulose carried out using medium composed of chitosan/ lactic and chitosan/ acetic acid.

Two types of hydrogels of bacterial cellulose modified by chitosan/ lactic and chitosan/ acetic acid, characterized by water content were compared with plant cellulose and inhibition activity against E.

coli and S.

aureus.

The inhibition of bacterial growth was clearly higher in the case of E.

coli.

as compared to S.

aureus.The percentage for inhibition of bacterial growth was 99.99% to E.

coli with two types of modified bacterial cellulose and 99.79% and 92.92% t0 Staph.

aureus with two types of modified bacterial cellulose respectively.Sixty one mutants were derived from the wildtype of the studied bacteria using chemical mutagen ( N- methyl- N- nitroso – N- nitrosoguanidine ).

Cellulose productivity was increased in all mutants, and the mutant termed A.

xylinum FEA 48 produced 12.82 g/ l of cellulose after only four days