Abstract:

The aim was to provide application and stability research of purple eggplant skin. Therefore, in this research purple eggplant skin was used as the raw material to extract, purify and identify the red pigment. The red pigment was extracted and purified using ethanol and petroleum ether. After red pigment concentrated and separated by paper chromatography, the separated compositions were tested of pH gradient experiment and measured the maximum absorption wavelength as well as HCl-magnesium Powder, neutral lead acetate and the color reaction of FeCl3 and other experiments. The results showed that three pigments were falconoid compounds when the three separated points were reacted color reaction with HCl -magnesium powder, neutral lead acetate and FeCl3 and the color all changed. The maximum absorption was showed when the value of pH=1, but the absorbency tended to reduce and spectrum curve became flat, when pH>1 and it showed that the purple eggplant skin red pigment belonged to a kind of anthocyanins pigment.