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- W2149787911 abstract "During the course of investigation of haloalkalophilic bacteria, we screened some heavily polluted soil samples from the mudflats surrounding the city of Inchon, Korea, for their bioflocculant producing ability. Based on the screening, one isolate no. 450 tentatively identified as Bacillus sp. produced an extracellular polysaccharide having flocculation activity. The isolate produced the polysaccharide during the late logarithmic growth phase. The polymer could be recovered from the supernatant of the fermented medium by cold ethanol precipitation and purified by treating with cetylpyridinium chloride (CPC). The polymer was identified as an acidic polysaccharide containing neutral sugars, namely, galactose, fructose, glucose and raffinose, and uronic acids as major and minor components, respectively. The amount of neutral sugars, uronic acid and amino sugars were 52.4, 17.2 and 2.4%, respectively. The molecular weight of the polysaccharide was found to be 2.2×106 Da. The Fourier transform infrared spectrophotometer (FT-IR) revealed typical characteristics of polysaccharides. 1H NMR spectrum showed that the polymer is a heteroglycan. Thermogravimetric (TGA) analysis indicated the degradation temperature (Td) at 290 °C. The rheological analysis of the polymer 450 revealed the pseudoplastic property with shear-thinning effect, while the compression test indicated that the polymer had high gel strength, and the S.E.M. studies showed that the polymer has a porous structure with small pore-size distribution indicating the compactness of the polymer." @default.
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- W2149787911 date "2004-06-01" @default.
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- W2149787911 title "Purification and characterization of an extracellular polysaccharide from haloalkalophilic Bacillus sp. I-450" @default.
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- W2149787911 doi "https://doi.org/10.1016/j.enzmictec.2004.03.001" @default.
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