The invention relates to a method for extracting high purity
anthocyanin. According to the method, purple tomatoes and nightshade are utilized as raw materials respectively. The purple tomatoes and the nightshade are smashed and homogenated first and then are mixed with
acid water with the pH of 1 and undergo supersonic extraction and
filtration, filter liquor is adsorbed by
macroporous resin, impurities are removed, the acid with the pH of 1 and 95% ethyl
alcohol are utilized to perform
elution, and obtained
elution liquid undergoes mist spray and
drying by a
spray dryer to obtain high purity
anthocyanin powder. According to the method, the problems that the loss is large, the yield is low, and the purity is low in the extracting process of
plant anthocyanin are solved, the purity of the obtained purple potato anthocyanin reaches up to 54%, the yield accounts for 0.48% of
fresh weight, the purity of nightshade anthocyanin reaches up to 56%, and the yield reaches up to 1.3% of the
fresh weight. The problem that the purity of the
plant anthocyanin sold in the domestic market is generally lower than 24% is solved, the device is simple to operate, the production process is clean and harmless, the product quality is stable, and the method is suitable for industrial production.