Ozone Application for the Bleaching of Unsaturated Coloring Material

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  • Choi, Hyeong-Ki (Department of Industrial Chemistry, College of Engineering, Hayang University) ;
  • Chung, Chang-Nam (Department of Polymer Engineering, College of Engineering, Suncheon University) ;
  • Kim, Jum-Sik (Department of Industrial Chemistry, College of Engineering, Hayang University)
  • 최형기 (한양대학교 공과대학 공업화학과) ;
  • 정창남 (순천대학교 공과대학 고분자공학과) ;
  • 김점식 (한양대학교 공과대학 공업화학과)
  • Received : 1991.06.13
  • Published : 1991.09.30

Abstract

Bleaching effect of ozone on unsaturated coloring material was compared quantitatively with the change of composition of reactants through the ozone oxidation of ${\beta}$-carotene. Beeswax colorized by carotenoids was reacted with ozone in water, 0.5 % and 1.0 % sodium hydroxide solution, and 20 % and 95 % acetic acid solution and bleaching effect of each reaction condition was compared with each other. And then the additive effect of hydrogen peroxide was investigated. Decrease of unsaturated double bond of ${\beta}$-carotene was proportioned quantitatively to the bleaching effect of ozone on ${\beta}$-carotene and was in accordance with the bleaching effect on beeswax. The bleaching effect of ozone on coloring material in 1.0 % sodium hydroxide solution was better than any other condition and the absorbance of beeswax at 390 nm was improved to 0.045 with the addition of hydrogen peroxide(2 % of wax). For the bleaching of beeswax, it was concluded that the ozone oxidation was more effective than physical adsorption.

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