Acid Yellow 23 (Tartrazine)

C.I.NO.：C.I.19140

CAS No.：1934-21-0

Molecular Formula：C₁₆H₉N₄O₉S₂Na₃

Chemical Name：1-(4’-sulfophenyl)-4-[(4’-sulfophenyl)azo]-1H-pyrazole-3-carboxylate,trisodium salt

Structure Formula：

Application Properties:（Changes after 48 hours at room temperature）

          ①、Stability in various pH solutions

                        pH=3                  no noticeable change

                        pH=5                  no noticeable change

                        pH=7                  no noticeable change

                        pH=8                  no noticeable change

         ②、Stability in aqueous acids

                       10% Acetic acid                 no noticeable change

                       10% Citric acid                  no noticeable change

                       10% Tartaric acid              no noticeable change

                       10% Malic acid                  no noticeable change

        ③、Stability in aqueous alkalis

                     10% Ammonium hydroxide        no noticeable change

                     10% Sodium carbonate              no noticeable change

                     10% Sodium bicarbonate           no noticeable change

                     10% Sodium hydroxide                fade