Discoloration Kinetics of Carthamus Red in Aqueous Ethanol

DOI JASI Web Site Web Site 6 References Open Access
  • ADACHI Shuji
    Faculty of Bio-environmental Science, Kyoto University of Advanced Science
  • MIYAGAWA Yayoi
    Faculty of Bio-environmental Science, Kyoto University of Advanced Science

Bibliographic Information

Other Title
  • 含水エタノール中でのベニバナ赤色素の退色動力学

Search this article

Abstract

<p>The solubility of carthamus red, red pigment from safflower, in aqueous ethanol largely depended on the ethanol concentration, and it was the highest near 60 and 70% (v/v) ethanol. Discoloration of carthamus red in aqueous ethanol was monitored under temperature-programmed heating conditions where the temperature of test solution raised linearly with time to evaluate the activation energy and frequency factor. The activation energy and frequency factor did not depend on the ethanol concentration, suggesting that ethanol does not affect the discoloration mechanism. The activation energy was 78 ± 5 kJ/mol. The increase in absorbance at 390 nm during discoloration of carthamus red correlated with the decrease in absorbance at 520 nm. This fact also suggests no effect of ethanol on discoloration mechanism of carthamus red.</p>

Journal

References(6)*help

See more

Related Projects

See more

Keywords

Details 詳細情報について

Report a problem

Back to top