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Baek,Hum-Young,Lee,Young-Sang 한국자원식물학회 2003 Plant Resources Vol.6 No.3
To improve industrial scale extraction method for extraction of icariin from Epimedium koreanum Nakai, the yields under different extracting conditions such as solvent, temperature, duration and solvent to plant material weight ratio were compared. Regarding extracting solution, highest extracts and icariin yield could be achieved when 10% EtOH was used. In case of plant material to extracting solvent ratio, no significant differences could be observed from 1/10 to 1/50, indicating 1/10 was the most efficient. Extracting temperature significantly affected extracts and icariin yields in that 90℃ increased the collected extracts and icariin contents up to 29.6% and 0.76%, respectively, compared to 27.2%, 0.33% at 70℃. The yield of extracts was less dependent upon extracting temperature compared to icariin yield. Regarding extraction time, 4 hr and 6 hr resulted in high extracts and icariin yield, respectively. We found extracting Epimedium koreanum Nakai in 10 times volume of 10% EtOH for 4 and 6 hr at 90℃ seem to be relatively efficient methods for extracts and icariin, respectively.
배기환,민병선,백흠영,안병준 충남대학교 암연구소 1991 癌共同硏究所 硏究誌 Vol.1 No.1
The extractability and stability of ginkgoflavonolglycosides under presence of several cellulase preparations were investigated. The enzymes used were macerosin, cellulase C and cellulase NC. The content variation of the glycosides was measured with HPLC method, using caffeic acid as an internal standard. The methanol extract of ginkgo leaf, containing the total flavonolglyco-sides of 4.46%, was used for the content comparison. By extraction with the enzymes, each or mixed, the peak levels of all the glycosides began to decrease after 1 or 2 hours. After 24 hour extraction, most of the glycosides were degraded to minor components. The flavonolglycosides in ginkgo leaf were also hydrolysed simply by the water extraction. After 24 hour extraction with water at 40°C, the peak levels of major glycosides were distinctly decreased. Rutin was hydrolysed by enzyme treatment or by ginkgo leaf itself. As a result, it was concluded that the commercially available cellulases and the ginkgo leaf itself contain the activities of β-glycosidase and α-rhamnosi-dase. Kaempferol-3-0-(6' -0-p-coumaroylglucosyl)-rhamnoside and four other ginkgo flavonolglycosides were not hydrolysed under the same condition."
Augmenting Effect of DA-9601 on Ghrelin in an Acute Gastric Injury Model
( Yoo Hum Baek ),( Kang Nyeong Lee ),( Dae Won Jun ),( Byung Chul Yoon ),( Ju Mi Kim ),( Tae Young Oh ),( Oh Young Lee ) 대한소화기기능성질환·운동학회 2011 Gut and Liver Vol.5 No.1
Background/Aims: Acute gastric injury by alcohol or indomethacin has been reported to be prevented by DA-9601, an extract of the herb Artemisia asiatica. Ghrelin, an endogenously produced gastrointestinal peptide hormone, has also been demonstrated to play a role in gastric mucosal defense. The aim of this study was to investigate the effects of DA- 9601 on ghrelin in an acute gastric injury model induced by alcohol or indomethacin. Methods: A total of 140 Sprague- Dawley rats were divided into two groups, a placebo group and a DA-9601-pretreated group. Thirty minutes later, half of the rats in each group received ethanol injury and the other half received indomethacin injury. Levels of serum ghrelin and gastric mucosal ghrelin mRNA were measured by ELISA and RT-PCR, respectively. Results: Immediately after ethanol administration, ghrelin increased in both groups pretreated with DA-9601 and placebo. However, the increase occurred more rapidly and was higher in the DA-9601-pretreated rats than in the controls that did not receive DA-9601-pretreatment. Similarly, from 30 minutes to 2 hours after indomethacin administration, the DA-9601-pretreated rats showed a significant increase in serum and gastric mucosal ghrelin concentrations, whereas placebo-pretreated rats showed only a mild increase. Conclusions: DA-9601 potentiates the endogenous production and secretion of ghrelin in acute gastric injury models induced by ethanol or indomethacin. (Gut Liver 2011;5:52-56)
조영흠(Young-Hum Cho),백승효(Seung-Hyo Baek),김광우(Kwang-Woo Kim) 한국생활환경학회 2010 한국생활환경학회지 Vol.17 No.6
This paper demonstrates the building energy audit to evaluate the building's energy performance and identify potential cost-effective energy saving opportunities. An building energy audit was conducted to investigate of existing control sequence for system operation, measure of the chiller plant, DX AHUs and terminal boxes and provide retrofit and control upgrade recommendations to address the comfort problems and improve the energy performance of the HVAC system. The results of building energy audit show that the building is currently using out of date pneumatic control systems, which result in higher energy costs, higher maintenance costs; constant speed fans are used in the systems with variable air volume (VAV) terminal boxes; and the DX condensing units have serious operation reliability and maintenance issues due to intermittent operation. To improve building energy operation and energy performance, recommendations were made: 1) VFDs on the fans were installed, 2) terminal boxes were upgraded to DOC, and 3) condensing units were replaced or converted DX coils to chilled water coil.
시뮬레이션 기상데이터 입력값 구축 및 적용에 관한 연구
조영흠(Cho, Young-hum),백승효(Baek, Seung-Hyo),김광우(Kim, Kwang-Woo) 한국건축친환경설비학회 2013 한국건축친환경설비학회 논문집 Vol.7 No.4
The objective of this study is to develop and apply weather data of EnergyPlus simulation input library for conducting simulation modeling. The results of this study show that Korean standard weather data of 11 locations can be utilized and measured weather data can be converted to epw format file for EnergPlus weather input file. First, input parameters should be compared and analyzed between standard weather data and EnergyPlus simulation input fields. Second, weather data file can be converted to epw EnergPlus input weather data format by using Weather Statistics & Conversions program. Third, converted data should be verified by applying EnergyPlus simulation. 11 standard Korean weather data and 7 measured weather data were converted and it can widely utilize for EnergPlus input file.
Min-Sook Kim,Mi-Kyoung You,Dong-Young Rhuy,Yung-Jae Kim,Hum-Young Baek,Hyeon-A Kim 한국영양학회 2009 Nutrition Research and Practice Vol.3 No.4
We examined the inhibitory effects of loquat methanol extract on the adhesion, migration, invasion and matrix metalloproteinase (MMP) activities of MDA-MB-231 human breast cancer cell line. Cells were cultured with DMSO or with 10, 25, or 50 ㎍/㎖ of loquat methanol extract. Both leaf and seed extracts significantly inhibited growth of MDA-MB-231 cells in a dose-dependent manner, although leaf extract was more effective. Adhesion and migration were significantly inhibited by loquat extracts in a dose-dependent manner. Loquat extract also inhibited the invasion of breast cancer cells in a dose-dependent manner and leaf extract was more effective than seed extract. MMP-2 and MMP-9 activities were also inhibited by loquat extract. Our results indicate that methanol extracts of loquat inhibit the adhesion, migration and invasion of human breast cancer cells partially through the inhibition of MMP activity and leaf extract has more anti-metastatic effects in cell based assay than seed extract. Clinical application of loquat extract as a potent chemopreventive agent may be helpful in limiting breast cancer invasion and metastasis.
배기환,민병선,백흠영,안병준 충남대학교 약학대학 의약품개발연구소 1991 藥學論文集 Vol.7 No.-
The extractability and stability of ginkgoflavonolglycosides under presence of several cellulase preparations were investigated. The enzymes used were macerosin, cellulase C and cellulase NC. The content variation of the glycosides was measured with HPLC method, using caffeic acid as an internal standard. The methanol extract of ginkgo leaf, containing the total flavonolglycosides of 4.46%, was used for the content comparison. By extraction with the enzymes, each or mixed, the peak levels of all the glycosides began to decrease after 1 or 2 hours. After 24 hour extraction, most of the glycosides were degraded to minor components. The flavonolglycosides in ginkgo leaf were also hydrolysed simply by the water extraction. After 24 hour extraction with water at 40℃, the peak levels of major glycosides were distinctly decreased. Rutin was hydrolysed by enzyme treatment or by ginkgo leaf itself. As a result, it was concluded that the commercially available cellulases and the ginkgo leaf itself contain the activities of β-glycosidase and α-rhamnosidase. Kaempferol-3-O-(6'"-O-p-coumaroylglucosyl)-rhamnoside and four other ginkgo flavonolglycosides were not hydrolysed under the same condition.