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국내 약용자원식물의 지방산 조성과 ${\gamma}-linolenic$ acid 탐색
김정봉,김용환,이철희,황영수,박노동,Kim, Jung-Bong,Kim, Young-Hwan,Lee, Cheol-Hee,Hwang, Young-Soo,Park, Ro-Dong 한국약용작물학회 1995 한국약용작물학회지 Vol.3 No.2
Fatty acid composition analysis was carried out from 60 species of Korean native medicinal plant to screen ${\gamma}-linolenic$ acid(GLA) resources. Oenothera odorata, SymPhytum officinal, and Lithospermum erythrorhizon contained ${\gamma}-linolenic$ acid with 9.5%, 3.5%, 7.2% of total fatty acid content, respectively. The vegetative organs usually contained higher level of ${\alpha}-linolenic$ acid than seeds. Some plants were found to be excellent source of unsaturated fatty acid. 우리나라에서 생산되고 있는 60여종의 약용식물의 지방산 조성을 조사하여 식물체의 부위 와 종류에 따른 지방산 조성의 특성을 관찰한 결과 아래와 같은 결과얻었다. 1. 달맞이꽃종자, 컴프리잎, 지치뿌리에서 각각 총지방산함량의 9.1, 3,5, 7,2%의 GLA가 검출되었으며 달맞이 꽃종자가 컴프리잎이나 지치뿌리보다 GLA의 절대량이 많았다. 2. 들깨종자, 참깨종자, 호박종자등의 지방산이 양(量)과 불포화도면에서 좋은 자원임이 확인되었다. 3. 식물체의 잎, 줄기, 뿌리에서의 지방산조성은 종자의 경우에 비하여 18 : 3의 분포 비율이 현저히 높게 나타났으며 18 : 0의 비율은 비교적 같게 나타났다.
김정봉 건국대학교 1991 論文集 Vol.7 No.-
The poly(glycolide) is promising polymer for bioabsorbable polymeric materials. The optimum polymerization conditions of glycolide were estabilished to produce high molecular weight poly(glycolide) which has adequate properties for synthetic absorbable suture. The glycolide monomer was produced by pyrolysis of low molecular weight poly (glycolide) which w as prepared from the condensation of glycolic acid with the catalyst of antimony trioxide. Pyrolysis was caroled out at 265℃ under 2mmHg pressure wish a yield of 85%. The glycoside was purified four times by recrystalization method, and ethylacetate was used as a solvent. Glycolide can be polymerized in the presence of Sn2+ and Sn4+ salt. In this experiments, stannous octoate was employed as the catalyst because of its acceptance by the FDA as a food stabilizer. The mole ratio of catalyst to monomer ([Cat]/[M]) was 1/5, 000. In the polymerization of glycolide, Poly(glycolide) was obtained with the conversion of 92-96% at 150℃, and 1/1, 000 of [Cat]/[M] for reaction time of 20-30 hours. But conversions were very low (Less than 30%) at low temperature (120℃, 130℃) and yellowish degraded poly(glycolide) was obtained at high temperature (190℃) In conclusion, glycolide monomer synthesis and the glycolide polymerization process were carried out successfully, and the optimum polymerization conditions such as catalyst content, reaction time and temperature, were established.