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식용 식물자원으로부터 활성물질의 탐색-V. -상추(Lactuca sativa L.)의 ACAT 억제 Diterpenoid, Phytol-
장태오,방면호,송명종,홍윤희,김지영,정대균,배동근,권병목,김영국,이현선,김인호,백남인,Jang, Tae-O,Bang, Myun-Ho,Song, Myoung-Chong,Hong, Yoon-Hee,Kim, Ji-Young,Chung, Dae-Kyun,Pai, Tong-Kun,Kwon, Byung-Mok,Kim, Young-Kuk,Lee, Hyun-Sun,Kim 한국응용생명화학회 2003 한국농화학회지 Vol.46 No.1
Confronting Sa-i-gu: Twenty Years After the Los Angeles Riots
장태한 서울대학교 미국학연구소 2012 미국학 Vol.35 No.2
Twenty years ago on April 29, 1992, Los Angeles erupted and Koreatown cried as it burned. For six-days,the LAPD was missing in action as rioting, looting, burning, and killing devastated the city. In the Korean American community, the Los Angeles riots are remembered as Sa-i-gu (April 29 in Korean). Korean Americans suffered disproportionately high economic losses as 2,300 Korean American businesses were looted or burned and suffered $400 million in property damages. Without any political clout and power in the city, Koreatown was unprotected and left to burn since it was not a priority for city politicians and the LAPD. As we commemorate the twentieth anniversary of Sa-i-gu, we still disagree on how to name what happened on April 29, 1992. Was it a riot? An uprising? A civil unrest or rebellion? During the LA riots of 1992, Korean immigrant-owned stores were targeted by African American rioters. The so called “Korean-African-American conflict” emerged as a visible and urgent urban problem during the 1980s and the early 1990s. This symbolizes that Los Angeles is a divided city that is still “separate and unequal.”Sa-i-gu served as an impetus for fundamental changes in Korean American identity and provided guidance for the future direction of the community. Many observers commented that the “Korean American was born or reborn on April 29, 1992.” The Korean American community also began to reevaluate their own economic, cultural, and political positions in America. What does it mean to be Korean American in multiethnic and multiracial America? The Korean American community has come a long way as it continues to become part of the multiethnic and multiracial city of Los Angeles and beyond. The purpose of this paper is to revisit the LA riots of 1992 and analyze how the Korean American community has changed and implemented lessons they learned since 1992. What happened and how was the Korean American community affected by the LA riots of 1992? What lessons have Korean Americans learned from it? How has the Korean American community changed since 1992? What has changed? What has not changed? What is the future direction of the Korean American community twenty years after the riots? These are some of questions that this paper intends to discuss and address.
초임계 이산화탄소를 이용한 겨우살이(Mistletoe, Viscum album) 추출물의 폴리페놀 함량 및 항산화 활성
장태오(Tae-Oh Jang),유양훈(Yang-Hoon Yoo),황용철(Yong-Chul Hwang),김현구(Hyun-Ku Kim),우현철(Hyun-Chul Woo) 한국식품영양과학회 2010 한국식품영양과학회지 Vol.39 No.1
소수성 저분자 물질의 추출에 효과적이며, 인체에 무해하고 친환경적 추출법인 초임계 이산화탄소를 이용하여 한국산 겨우살이를 추출한 후 추출물의 추출수율, 전자공여능 등의 항산화활성 평가 및 총 폴리페놀 함량을 측정하였다. 실험 결과 초임계 이산환탄소를 이용한 추출수율은 300 bar, 40℃에서 12.16%, 정제수와 주정을 이용한 추출물은 18.32, 23.84%로 초임계 추출물보다 높은 추출수율을 보였다. 전자 공여능은 초임계 이산화탄소 추출물이 15.73%(400 bar, 30℃), 정제수와 주정을 이용한 추출물이 36.73, 70.53%로 초임계 이산화탄소를 이용한 추출물의 활성은 일반 용매추출법으로부터 얻어진 추출물들에 비해 EDA 활성이 낮은 편이었다. 그러나 SOD 유사활성은 초임계 이산화탄소를 이용한 추출물이 22.54%(200 bar, 40℃), 정제수와 주정을 이용한 추출물이 7.85, 6.12%로 초임계 이산화탄소를 이용한 추출물이 일반용매를 이용한 추출물보다 우수한 활성을 나타내었다. 총 폴리페놀 함량은 초임계 이산화탄소 추출물이 17.57 wt%(200 bar, 50℃), 정제수와 주정을 이용한 추출물이 4.79와 5.46 wt%로 초임계 이산화탄소를 이용한 추출물이 일반용매 추출물보다 높은 함량을 보였다. 결론적으로 초임계 이산화탄소를 이용한 겨우살이 추출물의 전자공여능은 높지 않지만 우수한 SOD 유사활성과 총 폴리페놀 함량이 풍부하여 항산화 건강기능성 식품의 가능성을 갖는 것으로 사료되었다. This study was performed to investigate antioxidant activities of Mistletoe (MS) extracts by measuring electron donating ability (EDA), super oxide dismutase (SOD)-like activity and total polyphenol content (TPC). The extracts were obtained using supercritical carbon dioxide, hot-water and ethanol extraction. EDAs was the higher in ethanol extract (70.53%) than water (36.73%) or supercritical carbon dioxide extract (15.73% at 400 bar, 30℃) at concentration of 10 ㎎/mL. However, SOD-like activities and TPCs were the highest in the supercritical carbon dioxide extract. At concentration of 1 ㎎/mL, supercritical carbon dioxide extract (22.54% at 200 bar, 40℃) was higher SOD activity than water (7.85%) and ethanol extract (6.12%). Regarding TPCs of MS extracts, the content was the highest in supercritical carbon dioxide extract (17.57 wt% catechin equivalent at 200 bar, 50℃) followed by ethanol and water extract. These results suggest that it can be useful to develop functional foods using antioxidative active compounds of MS with high polyphenol contents.