A Study on the Effects of the Dissociation Constant of Edible Tar Pigment. I

혼합용매중(混合溶媒中)에서의 식용(食用) Tar색소(色素)의 해리정수(解離定數)에 관(關)한 연구(硏究) (제 1 보)(第 1 報) -2',4',5',7'- Tetraiodofluorescein Sodium염(鹽)에 대(對)하여-

The dissociation constant of erythrosine in the mixed solvent systems of water-alcohols and water-acetone at various pH and in concentration media were determined by spectrophotometric method. Methanol, ethanol, and acetone were employed as solvents and studied the changes of pK values of erythrosine according to the kind and change of concentration of organic solvent which is mixed into water solution. The effect of organic solvent on pK is negligible at 40% while in the case of above 40% mixing, it is not negligible.