| 摘要 |
PURPOSE:To provide a water-soluble ginkgo leaf extract remarkably reduced in its production cost and containing >=20wt.% glycoflavonoide and >=5.6wt.% terpene lactone. CONSTITUTION:There is provided a water-soluble ginkgo leaf extract prepared by concentrating and drying a ginkgo leaf extract solution adjusted to pH5.0 to 7.0 and containing >=20wt.% glycoflavonoide and >=5.6wt.% terpene lactone. This preparation of the water-soluble ginkgo leaf extract is carried out by obtaining a water-insoluble ginkgo leaf extract using a hydrous organic solvent, mixing water or a hydrous organic solvent therewith, then adding a basic compound thereto at <=30 deg.C so as to adjust pH to 6.0 to 7.0, subsequently filtering, concentrating and drying it or by blending the water-insoluble ginkgo leaf extract obtained by using a hydrous organic solvent with water or a hydrous organic solvent, then adding a basic compound thereto at <=80 deg.C so as to adjust pH to 5.0 to 6.0, subsequently filtering, concentrating and drying it. |
