Separation and extraction process of oligomer proanthocyanidin from pine bark

The separation and extraction process of oligomer proanthocyanidin from pine bark includes the steps of: pre-treatment, extraction, recovering solvent, concentration, solid-liquid separation, concentration, counter current extraction, concentration, drying, sterilizing and packing. During the extraction, water and ethyl acetate are used as solvent. The said process has high extraction rate, low cost, high product yield and quality, product OPC content as high as 95%. The product of the present inventino has high solubility in both water and alcohol, bright color and obvious curative effect.