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보성산 유기농 녹차의 품질에 따른 카테킨 함량과 항산화능 비교 분석
박경련(Kyung Ryun Park),이상길(Sang Gil Lee),남태규(Tae Gyu Nam),김영준(Young Jun Kim),김영록(Young-Rok Kim),김대옥(Dae-Ok Kim) 한국식품과학회 2009 한국식품과학회지 Vol.41 No.1
유기농 녹차의 등급별 총페놀 함량과 항산화능은 각 추출 용매에 따른 수율을 확인하였을 때 물 추출에 비하여 수용성 유기용매의 추출 수율이 유의적으로 높았다. 유기용매를 이용한 추출수율은 물을 이용할 때 보다 총페놀 함량은 1.5에서 3.2배, 항산화능은 1.8에서 3.8배 정도 높게 나타났다. HPLC 분석을 통하여 총페놀 함량과 항산화능의 상관관계를 비교 시 총페놀 함량이 증가함에 따라 항산화능이 1차 선형관계로 증가하는 경향을 보였다. HPLC분석을 통하여 유기농 녹차에 함유되어 있는 다양한 카테킨의 함량이 채엽시기에 따라 변화가 나타났다. 유기농 녹차의 카테킨 성분 중 가장 많이 존재하는 EGCG가 건조중량당 5.8-7.7%의 함량을 보였고, caffeine은 1.7-2.9%의 함량을 보였다. 유기농 녹차의 카테킨 함량은 일반적으로 채엽 시기가 늦어짐에 따라서 점차 감소하였다. 유기농 녹차의 등급에 따른 항산화능은 최상급인 우전에서 가장 높았으며 최하등급인 엽차에서 가장 낮게 나타났다. HPLC 분석에 의한 유기농 녹차의 등급에 따른 총 카테킨 함량(㎎/g)은 우전(155.4), 세작(147.7), 중작(143.2), 엽차(135.1), 대작(130.5)의 순서로 감소하였다. 이를 통해 녹차의 채엽 시기가 유기농 녹차의 카테킨 성분 및 항산화능에도 영향을 미치는 것을 확인하였다. 전반적으로 상급의 유기농 녹차 일수록 총페놀 및 카테킨 함량이 많으며 또한 더 높은 항산화능을 가지는 것으로 나타났다. The objective of this study was to evaluate the effect of various solvents on extraction of bioactive phenolics and to analyze the antioxidant capacity and contents of individual catechins in various grades of green teas organically grown in Boseong, Korea. The organic green teas, based on their harvest seasons, were categorized into five grades such as Woo-Jeon, Se-Jak, Jung-Jak, Dae-Jak, and coarse tea. Solvents used to extract phenolics from these teas included water at 23℃ and 70℃ as well as 80% (v/v) aqueous methanol and ethanol. In general, aqueous organic solvents of methanol and ethanol led to higher extraction yields of phenolics than water at 23℃ and 70℃. Total phenolics and antioxidant capacity of the teas extracted with the aqueous organic solvents were approximately 1.5 to 3.2 and 1.8 to 3.8 times higher than those with water at 23℃ and 70℃, respectively. Coarse tea, the lowest grade of green tea, showed approximately 30-60% lower total phenolics and antioxidant capacity compared with the higher grade ones. Reversed-phase HPLC analysis was performed quantitatively to identify individual catechins, gallic acid, and caffeine in teas extracted with 80% (v/v) aqueous methanol. Based on their dry weights, the organic green teas contained about 1.7 to 2.9% of caffeine. Content (㎎/g dry weight) of tea catechins decreased in the following order: Woo-Jeon (155.4) > Se-Jak (147.7) > Jung-Jak (143.2) > coarse tea (135.1) > Dae-Jak (130.5). (-)-Epigall℃atechin gallate was the most abundant among the catechins analyzed. The highest grade of green tea, Woo-Jeon, had the highest amount of (-)-epigall℃atechin gallate at 77.4 ㎎/g dry weight. Overall, the higher grade of organic green teas tended to have the higher level of antioxidant capacity and catechins.
Dae Yong Yi,Soon Chul Kim,Ji Hyuk Lee,Eun Hye Lee,Jae Young Kim,Yong Joo Kim,Ki Soo Kang,Jeana Hong,Jung Ok Shim,Yoon Lee,강빈,Yeoun Joo Lee,Mi Jin Kim,Jin Soo Moon,Hong Koh,JeongAe You,Young-Sook Kwak 대한소아소화기영양학회 2019 Pediatric gastroenterology, hepatology & nutrition Vol.22 No.1
The Committee on Pediatric Obesity of the Korean Society of Pediatric Gastroenterology, Hepatology and Nutrition newly developed the first Korean Guideline on the Diagnosis and Treatment of Obesity in Children and Adolescents to deliver an evidence-based systematic approach to childhood obesity in South Korea. The following areas were systematically reviewed, especially on the basis of all available references published in South Korea and worldwide, and new guidelines were established in each area with the strength of recommendations based on the levels of evidence: 1) definition and diagnosis of overweight and obesity in children and adolescents; 2) principles of treatment of pediatric obesity; 3) behavioral interventions for children and adolescents with obesity, including diet, exercise, lifestyle, and mental health; 4) pharmacotherapy; and 5) bariatric surgery.
Kim, Jeong Myeong,Lee, Hyo Jung,Lee, Dae Sung,Jeon, Che Ok American Society for Microbiology 2013 Applied and environmental microbiology Vol.79 No.6
<P>To characterize the denitrifying phosphorus (P) uptake properties of “<I>Candidatus</I> Accumulibacter phosphatis,” a sequencing batch reactor (SBR) was operated with acetate. The SBR operation was gradually acclimated from anaerobic-oxic (AO) to anaerobic-anoxic-oxic (A2O) conditions by stepwise increases of nitrate concentration and the anoxic time. The communities of “<I>Ca</I>. Accumulibacter” and associated bacteria at the initial (AO) and final (A2O) stages were compared using 16S rRNA and polyphosphate kinase genes and using fluorescence <I>in situ</I> hybridization (FISH). The acclimation process led to a clear shift in the relative abundances of recognized “<I>Ca</I>. Accumulibacter” subpopulations from clades IIA > IA > IIF to clades IIC > IA > IIF, as well as to increases in the abundance of other associated bacteria (<I>Dechloromonas</I> [from 1.2% to 19.2%] and “<I>Candidatus</I> Competibacter phosphatis” [from 16.4% to 20.0%]), while the overall “<I>Ca</I>. Accumulibacter” abundance decreased (from 55.1% to 29.2%). A series of batch experiments combined with FISH/microautoradiography (MAR) analyses was performed to characterize the denitrifying P uptake properties of the “<I>Ca</I>. Accumulibacter” clades. In FISH/MAR experiments using slightly diluted sludge (∼0.5 g/liter), all “<I>Ca</I>. Accumulibacter” clades successfully took up phosphorus in the presence of nitrate. However, the “<I>Ca</I>. Accumulibacter” clades showed no P uptake in the presence of nitrate when the sludge was highly diluted (∼0.005 g/liter); under these conditions, reduction of nitrate to nitrite did not occur, whereas P uptake by “<I>Ca</I>. Accumulibacter” clades occurred when nitrite was added. These results suggest that the “<I>Ca</I>. Accumulibacter” cells lack nitrate reduction capabilities and that P uptake by “<I>Ca</I>. Accumulibacter” is dependent upon nitrite generated by associated nitrate-reducing bacteria such as <I>Dechloromonas</I> and “<I>Ca</I>. Competibacter.”</P>
Basic : A case of propylthiouracil-induced acute hepatic failure (초)
( Dae Seon Ahn ),( In Hee Kim ),( Ji Youn Sohn ),( Dae Hun Kwon ),( Kang Hun Koh ),( Bum Soo Jeong ),( Seong Hun Kim ),( Sang Wook Kim ),( Seung Ok Lee ),( Soo Teik Lee ),( Dae Ghon Kim ),( Hee Chul Y 대한간학회 2011 Clinical and Molecular Hepatology(대한간학회지) Vol.17 No.3(S)
Plasma osteoprotegerin levels increase with the severity of cerebral artery atherosclerosis
Kim, Jinkwon,Song, Tae-Jin,Yang, Seung-Hee,Lee, Ok-Hee,Nam, Hyo Suk,Kim, Young Dae,Kim, Eun Hee,Lee, Hye Sun,Nam, Chung Mo,Heo, Ji Hoe Elsevier 2013 Clinical biochemistry Vol.46 No.12
<P><B>Abstract</B></P> <P><B>Objectives</B></P> <P>Osteoprotegerin (OPG) is a member of the tumor necrosis factor receptor superfamily and suggested as a marker of atherosclerosis. We investigated whether plasma OPG levels were associated with the presence and severity of cerebral atherosclerosis.</P> <P><B>Design and methods</B></P> <P>We used an enzyme-linked immunosorbent assay to measure the plasma OPG levels of 107 patients with acute cerebral infarction. We compared the plasma OPG levels according to the presence and number of arteries with cerebral atherosclerosis (≥50% stenosis).</P> <P><B>Results</B></P> <P>Of 107 patients, 73 (68.2%) had cerebral atherosclerosis. OPG levels were increased in patients with cerebral atherosclerosis (374.69±206.48 vs 261.17±166.91pg/mL, p=0.006). OPG levels showed positive correlation with the number of cerebral arteries with atherosclerosis (Spearman's <I>rho</I> =0.342, p<0.001). After adjustment for vascular risk factors, OPG>229.9pg/mL was independently associated with the presence [OR 4.61, 95% CI 1.57–13.55, p=0.005, binary logistic regression] of cerebral atherosclerosis and number [OR 3.20, 95% CI 1.26–8.12, p=0.014, ordinal logistic regression] of arteries with cerebral atherosclerosis.</P> <P><B>Conclusions</B></P> <P>Plasma OPG levels were significantly associated with the presence and severity of cerebral atherosclerosis. This finding suggests that plasma OPG might have a role in cerebral atherosclerosis.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Elevated OPG levels have been reported in patients with atherosclerotic diseases. </LI> <LI> The relationship between OPG and cerebral atherosclerosis is not well known. </LI> <LI> OPG levels were associated with presence and severity of cerebral atherosclerosis. </LI> </UL> </P>