EXTRACTION METHOD FOR THE EXTRACT CONTAINING PROANTHOCYANIDIN FROM PINE BARK USING ALKALI AS SOLVENT

摘要

A method for extracting an extract containing proanthocyanidin from bark of pine tree using alkali is provided to obtain an extract containing a large amount of proanthocyanidin which is used as food, pharmaceutical product, cosmetic product, feed for cattle or/and fishes. A method for extracting an extract containing proanthocyanidin from a bark of pine tree comprises: a step of pretreating the bark with low frequency, electric filed or magnetic field; a step of adding the bark with 0.095-0.4% of alkali solution in a weight ratio of 1:5~20; a step of extracting at 80~100°C for 5-30 minutes; and a step of performing with low frequency at 5~10kHz for five minutes to one hour and performing with magnetic treatment at 5~20kv for five minute to one hour. The bark of pine tree is radiata bark of pine tree. The alkali solution is obtained by resolving NaHCO3, Na2CO3 or NaOH in a purified water.