Extraction of Pigment from Primula Four Purple and Study of Its Stability

Pigment is extracted from purple primrose seasons as raw material,and its stability was studied. The results showed that the 95% ethanol solution with pH = 1 was a better extraction solvent,the pigment had maximum absorption peak at 382 nm; the pigment had good light resistance,bad reduction and oxidation resistance,and was unstable under acid condition; The metal ions Na+、K+、Mg2 +、Zn2 +have less effect on the pigment,but Fe3 +has larger effect on the stability of the pigment,while food additives( for example: glucose,sucrose,soluble starch and citric acid),low valence metal ions had no negative effect.