河川水から分離された細菌が産生する菌体外多糖類に関する研究

概要

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In order to find new thickening agents or emulsifiers which possess uselful characteristics forfood industries, we attempted screening of microorganisms from soli and water. As a result, we found one bacterial strain which produced a large amount of extracellular polysaccharide from Sumida River in Tokyo. The strain was identified as Klebsiella pneumoniae in conformity to Bergey's Manual of Systematic Bacteriology (1984). The polysaccharide (BS-1) produced by this strain showed higher viscosity than known thickening agents such as xanthan gum, carrageenan and tragacanth gum. The viscosity of 1% (w/v) BS-1 at 20°C reached 7000cps under the shear rate of 1/S. Besides, BS-1 possessed a good property as an emulsifier. When we made emulsions of O/W=3/7 using several emulsifiers involving BS-1 and observed after 3 days of storage at room temperature, it was found that BS-1 stabilized the emulsion at the concentration of as low as 0.1% (w/v), and that the emulsion kept its creamy smoothness.
日本水産學會の論文