Synthesis of carboxylated locust bean gum hydrogels by ionizing radiation

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Hayrabolulu H., Şen M., Celik G., Kavakli P.

Radiation Physics and Chemistry, vol.94, no.1, pp.240-244, 2014 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 94 Issue: 1
  • Publication Date: 2014
  • Doi Number: 10.1016/j.radphyschem.2013.05.048
  • Journal Name: Radiation Physics and Chemistry
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.240-244
  • Keywords: Locust bean gum, Carboxylation, Hydrogel, Radiation, Swelling, Gelation, INDUCED DEGRADATION, GAMMA-IRRADIATION, CHITOSAN, PRODUCE
  • Hacettepe University Affiliated: Yes

Abstract

In the present study, a locust bean gum (LBG) was carboxylated by a technique known as TEMPO mediated oxidation. Characterization of the carboxylated LBG (CLBG) was performed by spectroscopic and chromatographic techniques. The CLBG was then irradiated with gamma rays utilizing a 60Co gamma-ray source at the dose rates of 30 Gy/h and 300 Gy/h up to 10 kGy in very concentrated solutions called as “paste-like” and in the presence of acetylene. Sol–gel analysis was carried out in order to determine the polymer-to-gel conversion ratios. It was found that the swelling capacity of the hydrogels prepared in the presence of acetylene increased with dose from 19,000% to 34,000%. The gelation percentage was observed to increase rapidly up to 5.0 kGy, which then continued to increase at a slower rate. Despite low gelation, the crosslink density of the CLBG hydrogels prepared in the paste-like state was observed to be high.

In the present study, a locust bean gum (LBG) was carboxylated by a technique known as TEMPO mediated oxidation. Characterization of the carboxylated LBG (CLBG) was performed by spectroscopic and chromatographic techniques. The CLBG was then irradiated with gamma rays utilizing a Co-60 gamma-ray source at the dose rates of 30 Gy/h and 300 Gy/h up to 10 kGy in very concentrated solutions called as "paste-like" and in the presence of acetylene. Sol gel analysis was carried out in order to determine the polymer-to-gel conversion ratios. It was found that the swelling capacity of the hydrogels prepared in the presence of acetylene increased with dose from 19,000% to 34,000%. The gelation percentage was observed to increase rapidly up to 5.0 kGy, which then continued to increase at a slower rate. Despite low gelation, the crosslink density of the CLBG hydrogels prepared in the paste-like state was observed to be high. (C) 2013 Elsevier Ltd. All rights reserved.