KR2004077976-A将松树皮和叶浸泡于水中,用NaOH调节溶液pH至8~11,得到提取液,再用盐酸调节pH至2~4,离心收集沉淀物,在沉淀物中加入乙醇,离心得到上清液,减压浓缩上清液,浓缩液用己烷提取,即得松树提取物。该制备过程仅需少量有机溶剂。所用松树包括韩国或日本赤松、红松、日本 KR2004077976-A soak pine bark and leaves in water, use NaOH to adjust the solution pH to 8~11, get the extract, and then use hydrochloric acid to adjust the pH to 2~4, collect the precipitate by centrifugation, add ethanol to the precipitate, centrifuge to obtain The supernatant was concentrated under reduced pressure, and the concentrate was extracted with hexane to give a pine extract. The preparation requires only a small amount of organic solvent. Pine trees used include South Korea or Japan Akamatsu, Komatsu, Japan