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Xanthan gum as a bio- fermentation microbial heteropolysaccharide produced , because of its unique molecular structure , its pseudoplastic aqueous solution having a good stability , and has been widely applied in food, such as oil IDM , xanthan gum become a cause for concern , the use of safe biological materials. At the same time , in recent years , from a variety of ways to obtain oligosaccharide products , due to its unique biological activity has been high degree of attention of the researchers . Researchers have tried degradation of xanthan gum with chemical or biological methods to obtain oligosaccharides . With the warming of the oligosaccharide research , this work is in constant depth . The oligosaccharides obtained the biological activity of xanthan gum degradation caused widespread concern . Researchers have isolated from soil strains can be used for the degradation of the xanthan gum and cellulose-containing component , but its degradation product , the effect is not ideal . Isolated from other ways to a degradation of xanthan gum bacteria , and the corresponding physiological and biochemical studies , the bacteria can effectively degrade xanthan gum , has a good production of oligosaccharides prospects . First xanthan gum medium placed indoors , enrichment xanthan gum degrading bacteria , and then coating the tablet obtained by diluting pure strain , and then were inoculated into the liquid medium , whether the identification of bacteria , the degradation of xanthan gum and rescreening , a degradation ability of bacteria XD2 - 8 . XD2 - 8 strain was observed through a microscope morphological characteristics, by macromolecules hydrolysis experiments , sugar fermentation test , methyl acetoacetate methanol experiment , citrate utilization test , indole test , methyl red experiments , contacts enzyme experiments , as well as the carbon source experiment , nitrogen source experiment , aerobic experiments and to determine the optimal culture temperature and pH of the bacteria can withstand osmotic pressure, through these features , the preliminary view that the bacteria Paenibacillus spp . Determination of XD2 8 bacteria 16S rRNA sequences were analyzed by BLAST Clustal software found bacteria with glitter Paenibacillus Paenibacillus lautus relationship closest similarity greater than 97% , the strain was named Paenibacillus Lautus XD2 - 8 .
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