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이성구,오성천,장재선,Lee, Sung-Gu,Oh, Sung-Cheon,Jang, Jae-Seon 한국식품영양학회 2015 韓國食品營養學會誌 Vol.28 No.3
본 연구에서는 진피의 활용도를 높이기 위한 연구의 일환으로 유기용매별에 따른 생리활성물질의 용출량을 측정하기 위해, 진피와 에탄올 진피 추출물을 대상으로 유기용매인 에틸 아세테이트, 아세톤, 염화 메틸렌, 메탄올을 이용하여 추출한 시료를 대상으로 총 폴리페놀 함량, 전자공여능, glutathione S-transferase(GST)의 활성 저해력을 측정한 결과는 다음과 같다. 1. 총 폴리페놀 함량은 ethyl acetate인 경우 진피는 $928.48{\pm}1.19{\mu}g\;GAE/mL$, 에탄올 추출 진피는 $664.64{\pm}0.74{\mu}g\;GAE/mL$로, acetone인 경우 진피는 $886.03{\pm}0.44{\mu}g\;GAE/mL$, 에탄올 추출 진피는 $702.67{\pm}0.85{\mu}g\;GAE/mL$로, methylene chloride인 경우 진피는 $413.08{\pm}1.39{\mu}g\;GAE/mL$, 에탄올 추출 진피는 $429.64{\pm}0.61{\mu}g\;GAE/mL$로, methanol인 경우 진피는 $12,648.60{\pm}0.56{\mu}g\;GAE/mL$, 에탄올 추출 진피는 $16,108.20{\pm}0.73{\mu}g\;GAE/mL$로 나타나, 진피나 에탄올 추출 진피는 모두 methanol로 추출한 것이 상대적으로 높게 나타났으며, 총 폴리페놀의 함량 차이는 유기용매별 통계적으로 유의한 차이가 나타났다(p<0.05). 2. 전자공여능은 ethyl acetate인 경우 진피는 62.80%, 에탄올 추출 진피는 51.49%로 나타났으며, acetone인 경우 진피는 97.43%, 에탄올 추출 진피는 63.17%로 나타났으며, methylene chloride인 경우 진피는 52.20%, 에탄올 추출 진피는 67.68%로 나타났으며, methanol인 경우 진피는 97.63%, 에탄올 추출 진피는 96.18%로 나타났다. Electron donating ability(EDA)는 유기용매 중 메탄올로 추출하였을 때가 상대적으로 가장 높게 나타났으며, 유기용매별로 통계적으로 유의한 차이가 나타났다(p<0.05). 3. Glutathione S-transferase(GST)에 대한 활성 저해능은 ethyl acetate인 경우 진피는 76.22%, 에탄올 추출 진피는 75.54%로 나타났으며, methylene chloride인 경우 진피는 31.73%, 에탄올 추출 진피는 73.53%로 나타났으며, methanol인 경우 진피는 97.48%, 에탄올 추출 진피는 48.70%로 나타났다. Glutathione S-transferase(GST)에 대한 활성 저해능은 진피인 경우 유기용매 중 메탄올로 추출하였을 때가 가장 높게 나타났고, 에탄올 추출 진피인 경우는 에탄올과 methylene chloride로 추출할 때가 높게 나타났으며, 유기용매별로 통계적으로 유의한 것으로 나타났다(p<0.05). In this study, the total polyphenol content, electron donating ability (EDA) and inhibitory activity of glutathione S-transferase (GST) of freeze-dried Citrus unshiu extracts were examined. The Citrus unshiu extracts was obtained from four solvents such as ethyl acetate, acetone, methyl chloride and methanol, to evaluate its functional properties. Total polyphenol contents were measured in the two different extracts, and the extracts were screened for their potential antioxidant activities using tests such as electron donating ability (EDA), glutathione S-transferase (GST). The total polyphenol contents of Citrus unshiu extracts were $928.48{\pm}1.19{\mu}g\;GAE/mL$ in ethyl acetate (EA), $886.03{\pm}0.44{\mu}g\;RE/mL$ in acetone (AC), $413.08{\pm}1.39{\mu}g\;GAE/mL$ in methylene chloride (MC), $12,648.60{\pm}0.56{\mu}g\;GAE/mL$ in methanol (MeOH), respectively. Also, the total polyphenol contents of EtOH Citrus unshiu extracts were $664.64{\pm}0.74{\mu}g\;GAE/mL$ in EA, $702.67{\pm}0.85{\mu}g\;RE/mL$ in AC, $429.64{\pm}0.61{\mu}g\;GAE/mL$ in MC, $16,108{\pm}0.73{\mu}g\;GAE/mL$ in MeOH, respectively. The total polyphenol contents were significantly difference (p<0.05) between the solvents. The electron donating ability of Citrus unshiu extracts were $62.80{\pm}0.36%$ in EA, $97.43{\pm}0.51%$ in AC, $52.20{\pm}0.30%$ in MC, $97.63{\pm}0.46%$ in MeOH, respectively. Also, the electron donating ability of EtOH Citrus unshiu extracts were $51.49{\pm}0.26%$ in EA, $63.17{\pm}0.31%$ in AC, $67.68{\pm}0.55%$ in MC, $96.18{\pm}0.41%$ in MA, respectively. The electron donating ability were significantly difference (p<0.05) between the solvents. The inhibitory activity of glutathione S-transferase in Citrus unshiu extracts were $76.22{\pm}0.65%$ in EA, $31.73{\pm}0.48%$ in MC, $97.48{\pm}0.56%$ in MeOH, respectively. Also, inhibitory activity of glutathione S-transferase in EtOH Citrus unshiu extracts were $75.54{\pm}0.55%$ in EA, $73.53{\pm}0.38%$ in MC, $48.70{\pm}0.46%$ in MeOH, respectively. The inhibitory activity of glutathione S-transferase were significantly difference (p<0.05) between the solvents. These results indicated that the Citrus unshiu extracts is a high-valued food ingredient and the extraction with methanol will be useful as a nutritional source with natural antioxidant activities. Considering high consumer demand beneficial health effects, Citrus unshiu extracts can be utilized to develop functional food health- promoting and natural antioxidant agents.
SRM의 DC linke 전압리플을 고려한 단일 펄스 구동 방식의 특성 해석
李聖九(Sung-Gu Lee),鄭大成(Dae-Sung Jung),李柱(Ju Lee) 대한전기학회 2008 전기학회논문지 Vol.57 No.11
This paper deals the characteristic analysis of Switched Reluctance Motor(SRM) driven by single-pulse mode considering dc link voltage ripple. Two dimensional time-stepped Finite Element Method(FEM) is used to analyze the characteristic of SRM driven by single-pulse mode with dc link voltage ripple. The analysis results is verified by experimental test.
李成九(Lee, Sung-gu) 동양사학회 2012 東洋史學硏究 Vol.119 No.-
This thesis is a study about the divinity of principle of femininity intrinsic to spaces such as stones, caves and mountains and its persistency. Since the emergence of patriarchal society all over the world, a worship of a mother goddess declined and the universal tendency to put to death to mother goddess by patriarchal heavenly god and masculinize goddesses proceeded as well. In China also, such pattern can be verified in the myth of Nu Gua(女?) and Yu (禹), for example. In China, however, we see plain evidences that the principle of femininity survived in religion and philosophy including the ideas of paradise and sacred place and firmly supported the thoughts of Chinese people. The persistency of deep rooted customs of worshipping Male child-birth stone(祈子石), the fact that the chaos in the principle of mother goddess in Pre-Qin Daoism as well as in religious Daoism, its successor was far from an object to be overthrown but was revered in its indefinable status as the essential reality and the return to such chaos was regarded as the Real person who attained spiritual awakening, and finally the fact that Bixiayunjun(碧霞元君) had been worshipped as the object of prayer to have male child since Song(宋) dynasty are some of these evidences. Considering this persistency of principle of femininity, it may be a serious mistake for traditional view to simplify all mountains as places for decent of heavenly god and conclude all mountain worship services as rituals for heaven. Eternal life and regeneration which Mt. Kunlun(崑崙山) promises was possible at least in its primitive stage not in communion with the heaven but by the inexhaustible life force inherent in Mt. Kunlun itself. And such life force originated from the fact that Kunlun was recognized as hun-dun (混沌; chaos), hu-lu (葫蘆; gourd) or a cave. Mountains had feminine qualities of vales and caves as well as masculine qualities of mountaintops intrinsically. In so-called Daoistic heritage, the vales and caves were worshipped as the origin of life force, and as shown in Shanhaijing(山海經), it was not the mountaintop but the cave at the foot of the mountain that was recognized as the spring of water. The reason Chinese people have cherished the principle of femininity shown in paradise and sacred place is undoubtedly due to their earnest desire for life force. Consequently it is an important subject to identify the reasons for the significant attachment to this life - whether it can be simplified as their secular pragmatism or there is any other historical background to this inclination. As an extension of this subject, a thorough review for the viewpoint that geological positions of Daoism and Confucianism greatly contributed to the formation of their conflicting and dualistic world views; Daoism that rose in Central China came to represent feminist principle while Confucianism that rose from Changjiang(長江) basin came to represent masculine principle. In case the conclusion of this study is proved to be correct, some opinions are to be reviewed in this light. For example, the long held view of Zhang Guangzhi(張光直) that attributed the basis of existence of the shamanistic rulers in primitive civilization solely to their exclusive communion with heaven would require reexamination. And common views in the past which have simplified all the sources of life force and informations as heaven are open to further discussion.