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KMID : 0380019950100050547
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Korean Journal of Biotechnology and Bioengineering
1995 Volume.10 No. 5 p.547 ~ p.551
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Functional and Rheological Properties of γ-Polyglutamic Acid Produced by Alkalophilic Alcaligenes sp.
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Lee Shin-Young
Kang Tae-Su
Kim Jin-Young
Shim Chang-Sub
Kim Kap-Soo
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Abstract
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Some functional and rheological properties of the y-polyglutamic acid(y-PGA) produced from alkalophilic Alcaligenes sp. were investigated. Viscosity synergism with thickening agents, capacities for gelling, entraping of heavy metals, and flocculability of y-PGA were not observed, but the relatively good compatability with various polyvalent metallic ions, excellent absorption ability and spinnability were observed. The y-PGA solution showed non-Newtonian flow behavior and exhibited pseudoplastic property with a yield stress at above 1% concentration. The values of flow index for 1% solution were in the range of 0.41-0.75 showing shear rate dependency and the value of yield stress was 2.28 Pa. The value of consistency index was 0.868 Pa . S" and was exponentially dependent on concentration and temperature.
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