Journal
MACROMOLECULAR RESEARCH
Volume 13, Issue 4, Pages 339-343Publisher
SPRINGER
DOI: 10.1007/BF03218463
Keywords
poly(gamma-glutamic acid); PGA; Bacillus subtilis BS 62; gamma-irradiation; hydrogel; biopolymer
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Microbial hydrogel was prepared by gamma-irradiation of poly(gamma-glutamic acid) (PGA) which was produced from Bacillus subtilis BS 62 and it's physico-chemical characteristic was examined. The hydrogel, prepared from 10% PGA with the dose of 48 kGy, was swollen up to 1,3 70 times of specific water content as dry weight basis. The hydrogels obtained above the dose of 48 kGy appeared to have higher compressive strength but lower specific water content. The period to reach a swelling equilibrium for the hydrogel in deionized water at the temperature range of 4 to 45 degrees C was about 10 h. The swollen hydrogel was shrunk in ionic solutions with the increase of ionic strength, and the rate of shrinkage was greater in calcium chloride solution than in sodium chloride. Specific water content of the hydrogel was quickly decreased at 80 degrees C, showing a thermally hydrodegradable property.
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