Ouantitative Determination of Ionic bonded Sodium-ion for Red No. 201 (Lithol Rubine B)

Abstract

Red No 201 (Lithol Rubine B) is defined as the monosodium salt by Japananese law (Shohrei). In USA, FDA had changed the chemical name for Lithol Rubne B as the disodium salt rather than the monosodium salt at 1983 because analytical results confirmed it.
We tried quantitative determination of ionic bonded sodium-ion for Red-No 201 by ICP (Inductively Coupled Plasma Atomic Emission Spectrometry). ICP analysis showed that Red No 201 is bonded by two sodium-ion.