1988 Volume 108 Issue 10 Pages 1008-1011
To establish the preparing method of the crude drug, kijitsu, 8 kinds of unripe citrus fruit including Citrus unshiu MARCOVITCH as well as C. aurantium L. subsp.amara ENGLER or C. natsudaidai HAYATA were divided horizontally in two parts and dried under the sun-shine or with hot air below 50°C. Four flavonoids (narirutin, naringin, hesperidin and neohesperidin) were determined by high performance liquid chromatography. Flavonoid content of kijitsu prepared with hot air was about 1.5-times that by solar drying. Most of flavonoid was contained in albedo-free peel. Hot air drying gave fine fragrance and greenish color to kijitsu. Furthermore, it saved labor and time compared with the solar drying method.
