Study on the Stability of Red Pigment in Gladiolus gandavensis

The paper,used the petal of Gladiolus gandavensis as experiment materials,studies the effects of light,ultraviolet,pH value,reductant,oxidant,sucrose,sodium benzoate and metal ion on stability of the red pigment.The result showed that it belong to water soluble cyanidinoid pigments.Under pH values 1,the red pigment is more tolerable of heat and light,and strong resisting radiation.The pigment is poor in resistance against reductant and oxidant.The red pigment is found in the experiments that sucrose, sodium benzoate have effects on the stability of itself.Metal ions such as Na+,K+,Ca2+,Zn2+,Cu2+ have faintly effects on the stability of it while other ions such as Mg2+,Al3+ can strengthen the pigment colour. And Fe3+ have changed the color of solution of pigment and influenced on the chroma of pigment.The investigation also indicated that the red pigment can be properly used in low sugar and concentrated acid juice,it is natural health pigment of worthy of development