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KMID : 0545119980080020178
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Journal of Microbiology and Biotechnology
1998 Volume.8 No. 2 p.178 ~ p.181
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Rheological Properties of a Novel High Viscosity Polysaccharide, A49-Pol, Produced by Bacillus polymyxa
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KIM, SEON-WON
AHN, SEUNG-GU/SEO, WEON-TAEK/KWON, GI-SEOK/PARK, YOUNG-HOON
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Abstract
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An exopolysaccharide, designated as A49-Pol, was produced from Bacillus polymyxa KCTC 8648P in nitrogen sufficient conditions. The viscosity of the culture broth increased up to 2×10 exp (4) cP in 38 hours of culture and then decreased to 1.5×10 exp (4) cP at 48 hours. The 1.0% (w/v) solution of purified A49-Pol represented pseudoplasticity with a viscosity of 2.7×10 exp (4) cP which was two times higher than xanthan at the same concentration. The viscosity of the A49-Pol solution was also greatly affected by its concentration in comparison with the xanthan solution. The viscosity of 1.0% A49-Pol solution was 930-fold higher than its 0.2% solution, whereas the corresponding viscosities of xanthan solution experienced only 17-fold difference. The viscosity was observed to be maximum at pH 7.0 in both A49-Pol and xanthan solutions, and gradually decreased as the pHs of the polysaccharide solutions went to acidic or alkaline regions. The viscosity of A49-Pol solution was very sensitive to temperature compared to xanthan and decreased with increasing temperature. The viscosity of 0.6% solution of A49-Pol was 8,100 cP at 10℃ and 55 cP at 50℃. The viscosity was also affected by the presence of surfactants such as Span 20 and Triton X-100; with 0.5% Triton X-100 (v/v), the viscosity of A49-Pol solution increased by 50%.
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