Preparation and swelling characteristics of hydrogel from microbial poly(γ-glutamic acid) by γ-irradiation

Macromolecular Research - Tập 13 - Trang 339-343 - 2005
Seong-Hyun Choi1, Kyung-Sook Whang2, Jong-Soo Park3, Woo-Young Choi4, Min-Ho Yoon4
1Division of Lifescience, The Institute of Natural Science, Deajeon, Korea
2Division of Lifescience, Mokwon University, Deajeon, Korea
3Namyang Dairy Products Co., Ltd., Gongju, Korea
4Department of Agricultural Chemistry, College of Agriculture and Lifesciences, Chungnam National University, Daejeon, Korea

Tóm tắt

Microbial hydrogel was prepared by γ-irradiation of poly(γ-glutamic acid) (PGA) which was produced fromBacillus 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 1,370 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 °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 °C, showing a thermally hydrodegradable property.

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