Degradation of Alginate Solution by Using ${\gamma}-Irradiation$ and Organic Acid

감마선과 유기산을 이용한 알긴산 용액의 저분자화에 대한 연구

  • Cho, Min (Department of Food Engineering, Kyung Hee University) ;
  • Kim, Byung-Yong (Department of Food Engineering, Kyung Hee University) ;
  • Rhim, Jong-Hwan (Department of Food Bio-Engineering, Mokpo National University)
  • 조민 (경희대학교 식품공학과) ;
  • 김병용 (경희대학교 식품공학과) ;
  • 임종환 (목포대학교 식품생물공학과)
  • Published : 2003.02.01

Abstract

Alginates were irradiated in an aqueous solution with $Co^{60}$ gamma rays in the dose ranges from 0 to 100 kGy, and investigated the relationship between the intrinsic viscosity $([{\eta}])$ and the molecular weight $(M_w)$ of alginates. The molecular weight of alginate was measured by gel permeation chromatography and the ranges from 1,894 to 135,174 Da were obtained. The molecular weight of alginate decreased markedly with increasing the degree of ${\gamma}-ray$ dose rate. The intrinsic viscosity of alginate solution after ${\gamma}-irradiation$ showed the ranges from 9.83 (g/g) to 602.69 (g/g), depending upon the ${\gamma}-irradiation$ dose. The molecular weight of alginate dependence of the intrinsic viscosity of the alginate solution would be expressed by Mark-Houwink equation. With a linearization of molecular weight and the intrinsic viscosity of the alginate solution, Mark-Houwink equation could be expressed with constant variables and the real data fitted to the equation of $[{\eta}]=2.2{\times}10^{-6}\;{M_w}^{1.656}\;(R^2=0.998)$.

Keywords

sodium alginate;irradiation;Mark-Houwink equation;intrinsic viscosity;molecular weight

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