Extraction of Pigment from the Flowers of Pyrostegia ignea Presl and its Stability

Extraction of a pigment from the flower of Pyrostegiaignea Presl.was studied by single factor experiment and L9(33) orthogonal test.The results showed that the best extraction solvent was determined as acetone and the optimum acetone-extraction conditions were as follows:material-extraction solution ratio of 1:10(g/mL),extraction temperature 60 ℃,and extraction time 10 h.The obtained pigment had good thermo-stability,high anti-oxidation and deoxidizing agent-resisting properties.Besides,it was stable under weak acid and alkli conditions.Most of the tested food addiitive and metallic ion had little effects on the pigment,but it could be obviously influence by Fe3+,starch and sunlight.