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유경수(Kyung Soo Ryu),육창수(Chang Soo Yook) 한국생약학회 1972 생약학회지 Vol.3 No.4
Five compounds(I∼V) were isolated from the roots of Peucedanum terebinthacem growing in Korea. Compounds I, IV and V are β-sitosterol, bergapten and umbelliferone, respectively. IR and NMR spectra of compounds II (mp. 190°) and 111(mp. 111∼120°), both white needle crystalls, indicate that compound II is a furocoumarin and that compound III, yielding decursinol upon saponification, is a pyranocoumarin.
유경수(Kyung Soo Ryu),홍남두(Nam Doo Hong) 한국생약학회 1970 생약학회지 Vol.1 No.1
The methanol extract of two kinds of liquorice on Korean market was examined for basic components by a general alkaloid extraction method. The hydrochloride of the components gave all positive reactions to five coloration and precipitation tests. Four coloration tests on the thin-layer chromatograms of the free bases showed three to five spots which are considered to be basic.
유경수(Kyung Soo Ryu),육창수(Chang Soo Yook),홍남두(Nam Doo Hong) 한국생약학회 1971 생약학회지 Vol.2 No.3
The nation-wide medicinal plants list is prepared on the basis of the collected plant samples from 22 places of 9 regions where the authors possiblely surveyed and the references on field survey reported by others. No one has reported this kind of list before and the Engler`s classification system is applied in this list instead of the previously applied Nakai`s classification system. And also Korean name, occurrence, distribution, medicinal part, and name of crude drugs are described in the list. According to the results of this study, the number of the natural and cultivated medicinal plants in Korea are 950 kinds presently; i.e., 719 species, 1 subspecies, 209 varieties, 1 subvariety and 20 formas which belong to 142 families and 437 genera. Out of the 950 medicinal plants, cryptogamae are 22, herbs 550 and woodies are 278. The usual common drugs are 284 kinds and the allied plants are estimated 160 kinds. And there are some folk medicines and un-utillized medicinal plants.
육창수(Chang Soo Yook),김종우(Chong Woo Kim),유경수(Kyung Soo Ryu) 한국생약학회 1973 생약학회지 Vol.4 No.4
Silica gel column chromatography on the ether extract from the fruits of Angelica gigas NAKAI gave two kinds of crystalline constituents. The following derivatives of coumarins were identified by IR, NMR spectra, elemental analysis and physico-chemical tests: iso-imperatorin (mp 108∼109°, C<sub>16</sub>H<sub>14</sub>O<sub>4</sub>) and decursidin (mp 60∼61°, C<sub>24</sub>H<sub>28</sub>O<sub>7</sub>).