| 摘要 |
PURPOSE:To produce an easily absorbable glycoside extract of ginkgo leaf in improved extraction efficiency by extracting ginkgo leaf with water or a water/ethanol mixture and carrying out sugar transfer of a water-insoluble component of the extracted liquid or a liquid containing dried extract using a specific sugar-transfer method. CONSTITUTION:Dried and roughly crushed green leaf of ginkgo is extracted with water or a water/ethanol mixture under heating to extract the water-soluble active component. The extracted liquid is mixed with a partial hydrolyzate of starch such as dextrin and glycosidase or trans-glycosidase having the activity to transfer the glucose group of the partial hydrolyzate of starch. The active component scarcely soluble or insoluble in water is subjected to the sugar transfer to a water-soluble glycoside and the glycoside is dissolved in the extracted liquid by this procedure. The dried extract is added to the extracted liquid and subjected to the process similar to the above process and the dissolved glycoside produced by this process is separated, purified and concentrated by conventional process to obtain the extract of the glycoside. The extraction efficiency of the active component can be improved and an easily absorbable glycoside having high absorption efficiency in living body can be produced by this process. |
