Stability of red pigment produced by strain WD02

The stability of WD02 strain producing red pigment was investigated experimentally under different conditions including temperature,pH value,light,oxidant,reductant and metallic ions.The results showed that the red pigment of WD02 strains was more stable under 40℃ and more stable to light.The preservation rate was higher in pH 5~7 environment,it was applied to slightly acid food coloring.The pigment was unstable to oxidant,whose preservation rate declines slightly due to Na2SO3.Cu2+、Zn2+、Mg2+、K+、Na+etc metalions had hyperchromic effect to red pigment,but metalions like Fe3+,Fe2+and Ca2+could destroy the red pigment stability of WD02 strain and cause the loss of red pigment.