Chemistry of a color reaction of retinoic acid (vitamin A acid) in sulfuric acid.

@article{Tsukida1978ChemistryOA,
  title={Chemistry of a color reaction of retinoic acid (vitamin A acid) in sulfuric acid.},
  author={K. Tsukida and Masayoshi Ito and F Tomeoka and Atsuko Kodama},
  journal={Journal of nutritional science and vitaminology},
  year={1978},
  volume={24 3},
  pages={335-7}
}
Retinoic acid (vitamin A acid) (I) has long been recognized as one of the most interesting members of the retinoid family (1). A quantitation method of I was proposed by KAWASAKI et al. who estimated an absorptivity of coloration developed by 74% sulfuric acid (2). The color was found to be stable in sulfuric acid, persisting for several hours at room… CONTINUE READING