Effect of Metal Cations on the Viscosity of a Pectin-Like Capsular Polysaccharide from the Cyanobacterium Microcystis flos-aquae C3-40.

Applied and Environmental Microbiology
Dorothy L ParkerR E Moore

Abstract

The properties of purified capsular polysaccharide from the cyanobacterium Microcystis flos-aquae C3-40 were examined by capillary viscometry. Capsule suspensions exhibited similar viscosities between pH 6 and 10 but were more viscous at pH <=4 than at pH 6 to 11. At pH 7, a biphasic effect of metal ion concentration on capsule viscosity was observed: (i) capsule viscosity increased with increasing metal ion concentration until a maximal viscosity occurred at a specific concentration that was a reproducible characteristic of each metal ion, and (ii) the viscosity decreased with further addition of that ion. Because the latter part of the biphasic curve was complicated by additional factors (especially the precipitation or gelation of capsule by divalent metal ions), the effects of various metal chlorides were compared for the former phase in which capsule viscosity increased in the presence of metal ions. Equivalent increases in capsule viscosity were observed with micromolar concentrations of divalent metal ions but only with 10 to 20 times greater concentrations of Na(sup+). The relative abilities of various metal salts to increase capsule viscosity were as follows: CdCl(inf2), Pb(NO(inf3))(inf2), FeCl(inf2) > MnCl(inf2) > Cu...Continue Reading

References

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Citations

Apr 19, 2007·Journal of Basic Microbiology·Anita Suresh KumarBhavanath Jha
May 23, 2019·Applied Microbiology and Biotechnology·Yongting QiuRuibo Ji
Sep 4, 2001·Biotechnology & Genetic Engineering Reviews·P LiZ Liu
Apr 20, 2006·Letters in Applied Microbiology·K WatanabeH Tanaka
May 28, 2016·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Lizhen LiuYongming Wu
Feb 24, 2018·Biological Reviews of the Cambridge Philosophical Society·Man XiaoColin S Reynolds

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