• 한국진공학회:학술대회논문집
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• 한국진공학회 2013년도 제45회 하계 정기학술대회 초록집
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• pp.274.1-274.1
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• 2013

We report the circumferential alignment of human aortic smooth muscle cells (HASMCs) in an orthogonally micropatterned circular microfluidic channel to form an in vivo-like smooth muscle cell layer. To realize a biomimetic smooth muscle cell layer which is aligned perpendicular to the axis of blood vessel, we first fabricated a half-circular polydimethylsiloxane (PDMS) microchannel by soft lithography using a convex PDMS mold. The orthogonally micro wrinkle patterns were generated inside the half-circular microchannel by stretching-releasing operation under UV irradiation. Upon UV treatment with uniaxial 40 % stretch of a PDMS substrate and releasing process, the microwrinkle patterns perpendicular to the axial direction of the circular microchannel were generated, which could guide the circumferential alignment of HASMCs successfully during cultivation. The analysis of orientation angle, shape index, and contractile protein marker expression indicates that the cultured HASMCs revealed the in vivo-like cell phenotype. Finally, we produced circular microchannels by bonding two half-circular microchannels, and cultured the HASMCs circumferentially with high alignment and viability for 5 days. These results are the first demonstration for constructing an in vivo-like 3D smooth muscle cell layer in the circular microfluidic channel which can provide novel bioassay platforms for in-depth study of HASMC biology and vascular function.

• 대한본초학회지
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• 제22권4호
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• pp.187-199
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• 2007

Objectives : The present study purposed to compare the antioxidant effect, anti inflammatory effect and cancer cell multiplication inhibition effect of Fructificatio Inonoti Obliqui aqueous extract according to extraction temperature. Methods : We medicated animal models, which had experimental oxidation, with Fructificatio Inonoti Obliqui total extract and $50^{\circ}C$ low temperature leachate, and performed hematological analysis and blood chemical analysis with measuring SOD, GSH, catalase, NO and MDA content in the liver. In addition, we made comparative observation of anti inflammatory effect and anti-cancer effect. Results : Compared to the control group, both the group medicated with Fructificatio Inonoti Obliqui total extract and with $50^{\circ}C$ low-temperature leachate were found to decrease the number of thrombocytes in blood plasma and NO content while to increase SOD activity and catalase activity significantly. Both groups also showed anti-inflammatory effect against THP-1 cells and a multiplication inhibition effect against liver cancer cells and stomach cancer cells significantly. Conclusions : Both Fructificatio Inonoti Obliqui total extract and Fructificatio Inonoti Obliqui $50^{\circ}C$ low-temperature leachate have significant antioxidant effect, anti inflammatory effect and anti cancer effect.

• Environmental Analysis Health and Toxicology
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• 제25권4호
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• pp.279-286
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• 2010

Objectives : Platinum nanoparticles (PNPs) are potentially useful for sensing, catalysis, and other applications in the biological and medical sciences. However, little is known about PNP toxicity. In this study, adverse effects of PNPs on the postnatal development of mouse pubs were investigated. Methods : PNPs (size: 20 nm) were prepared and orally administered to mice during premating, gestation, and lactation periods (0.25 mg/kg, 0.5 mg/kg, and 1 mg/kg). Maternal and pup toxicity were evaluated. Results : PNPs did not affect blood biochemical parameters or mortality in dams during the experimental period. Histopathological signs were not observed and pup number was not different between the control and treated groups. Deformity and stillbirth were not observed in the pups. However, PNPs increased pup mortality and decreased the infant growth rate during the lactation period. Conclusion : PNPs may have adverse effects to the postnatal development of mouse pups.

• Archives of Plastic Surgery
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• 제32권1호
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• pp.5-11
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• 2005

Prostaglandin $E_1$($PGE_1$) is known to have various physiological action such as vasodilatation, decrease of blood pressure, angiogenesis, inhibition of platelet aggregation and so forth. $PGE_1$ has been developed in many different formulations in order to overcome its chemical instability and deactivation in the lungs when administered parenterally. Lipo-AS013 is a potent drug with higher chemical stability and greater vascular wall targeting than others. The study was done on $3{\times}10cm$ model flap of dorsal skin of Sprague-Dawley rats and the flap perfusion survival were observed and documented. The flap treated with Lipo-AS013 beforehand was given intravenously Sodium fluorescein 10 minutes later, and then Percent Dye Fluorescence Index(% DFI) was calculated. The results were compared to a control group and the group administered locally epinephrine.. In the control group, the % DFI and flap survival rate increased from $54.1{\pm}6.7$ to $65.0{\pm}2.6$(p<0.01) while in Lipo-AS013 group from $55.3{\pm}2.2$ to $67.4{\pm}1.9$(p<0.01), respectively. In the epinephrine group, the % DFI(p<0.05) and flap survival rate(p<0.001) decreased. In the both epinephrine and Lipo-AS013 group Percent DFI and flap survival rate are comparable with the control group.The result indicates that the potent Lipo-AS013 enhances the blood flow and flap survival. This highly potent Lipo-AS013 may have targeting ability and accumulate $PGE_1$ onto the vascular walls. A quantitative analysis of fluorescence on the skin surface is a reliable tool to measure the blood perfusion into an ischemic flap and its viability. Further comparative study with conventional $PGE_1$ and Lipo-$PGE_1$ is needed in order to clarify the action and efficiency of Lipo-AS013.

• 대한본초학회지
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• 제35권4호
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• pp.1-8
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• 2020

Objectives : Angelicae gigas, A. sinensis and A. acutiloba are three types of plants used as Angelicae Radix (Dang-Gui). Many doctors of Korean medicine want to know the difference in clinical use of these three species. This study aimed to compare the hemoglobin-related activity of the extracts of Angelicae gigas, A. sinensis and A. acutiloba roots by measuring the intensity of binding oxygen to hemoglobin using Raman spectroscopy. Methods : Hemoglobin activity was measured by chemical analysis and Raman spectroscopy to compare the pharmaceutical efficacy of three Angelica root extracts. The oxygenated hemoglobin intensity, blood decursinol and acetylcholinestrase(AChE) concentration in mice were measured. In addition, the effects of three Angelica root extracts on oxygenated hemoglobin intensity, decursinol and AChE concentration in red blood cells (RBC) from human were also investigated. Results : The contents of decursin, decursinol and decursinol angelate, which affected physiological activity and RBC properties, were higher in the extract of A. gigas root than in those of A. sinensis and A. acutiloba roots. Moreover, oxygenated hemoglobin intensity in the A. gigas extract was higher than that of other two species in the blood of mice and human RBCs. Also, the blood decursinol and AChE concentrations of A. gigas root extract were higher than that of A. sinensis and A. acutiloba roots. Conclusions : These results suggest that A. gigas is more effective in treating disease related oxygen deficiency in RBC deformation under oxidative stress.

• 분석과학
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• 제26권3호
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• pp.199-204
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• 2013

본 연구에서는 음주 후 시간경과에 따른 혈중알코올농도 변화의 재현성을 실험하였다. 5명의 한국인 자원자에게 22%(v/v) 소주 한병(ethyl alcohol로 환산했을 경우 55.5 g)을 30분 안에 나눠 마시게 하는 실험을 5회 반복하였다. 자원자들에게는 안주로 회와 탕수육을 교대로 제공하였다. 알코올 섭취량과 섭취시간을 일정하게 유지했음에도 불구하고 혈중알코올농도가 최고에 이르는 시간과 그 때의 농도 및 시간경과에 따른 혈중알코올농도의 감소율은 사람에 따라 큰 차이를 보였다. 또한 안주에 따라서도 시간 변화에 따른 혈중알코올농도 변화곡선이 달라지는 것을 확인할 수 있었다. 동일인에게 5회에 걸쳐 각기 다른 날 동일한 조건으로 음주하게 한 후 혈중알코올농도 변화곡선을 관찰한 결과, 시간경과에 따른 혈중알코올농도변화는 재현성이 없이 나타나는 것을 확인하였다. 또한 특정 시간대의 혈중알코올농도를 정확하게 역추정하는 것은 불가능하다는 것을 알 수 있었다.

• 급식외식위생학회지
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• 제4권1호
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• pp.1-6
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• 2023

This study was conducted to evaluate the chemical hazards of 74 kinds of commercial anchovy fish sauce in Korea by measuring their biogenic amine content. The biogenic amines detected in commercial anchovy fish sauce were tryptamine, putrescine, cadaverine, tyramine, spermidine, spermine, and histamine. Among them, histamine content was the highest with an average of 1,439.62±812.62 mg/kg. Excessive intake of histamine could result in chemical food poisoning characterized by high blood pressure, headache, and diarrhea. Accordingly, by simulating histamine exposure (repetition=10,000 times) based on the daily intake of 0.969 g of domestic anchovy fish sauce, we found that the estimated average histamine exposure was 24.49±55.48 ㎍/kg bw/day and that the margins of exposure (MOE) value were 139.18 at 1% and 66,141.07 at 95% of 10,000 simulations (9,500 times). As such, it was confirmed that 9,500 out of 10,000 simulations of MOE analysis significantly exceeded MOE 10. Therefore, the risk of exposure to histamine from ingestion of commercial anchovy fish sauce is approximately very low.

• Korean Chemical Engineering Research
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• 제55권3호
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• pp.287-295
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• 2017

Using nanotechnology, magnetic nanoparticles of iron oxide were produced via co-precipitation method and followed modification with organic compounds. In the next step, functionalized monomer was provided via coupling ${\beta}$-cyclodextrine and allylamine onto modified magnetic nanoparticles. These nanoparticles were used to establish the adsorption rate of celecoxib. Magnetic nanoparticles are modified by (3-mercaptopropyl)trimethoxysilane. Nano-adsorbent was characterized by analytical and spectroscopic methods, such as Fourier transform infrared spectroscopy, elemental analysis, thermo-gravimetric analysis, and transmission electron microscopy (TEM). Laboratory parameters, such as the kinetics of adsorption isotherms, pH, reaction temperature and capacity were optimized. Finally, by using this nano-adsorbent in the optimized condition, extraction of celecoxib from biological samples as urine, drug matrix and blood plasma was carried out by high performance liquid chromatography with sensitivity and high accuracy.

• Environmental Analysis Health and Toxicology
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• 제12권3_4호
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• pp.43-54
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• 1997

Species, doses and routes extrapolation can be sucessfully carried out by using a physiologically-based pharmacokinetic (PBPK) approach. And PBPK approach to assess risk of hazardous chemicals is reasonable whatever the exposure scenarios are happened. Both partitioning coefficients of chemical between tissue and blood and enzymatic metabolic rate constants are key parameters to build up the PBPK model. In this study, we tried to estimate in vitro metabolic rate constants using a special apparatus instead to measure the in vivo constants which are used to PBPK simulation since the in vitro tests are less expensive and more convenient than in vivo tests. For the purpose, we designed and tested the new system to measure continuously the headspace concentration of VOC. The newly designed system is composed with a diffusion chamber which generates gaseous substrate, a reaction vessel with a recirculating pump to establish a closed system, an autbmatic sampler from a gas phase, a gas chromatography to analyze the headspace. In addition, a cold water condenser is attached between the reaction vessel and pump to reduce the content of gaseous moisture which interferes with chemical analysis. To validate the newly developed methodology, in vitro metabolic rate constants of trichloroethylene (TCE) as a prototype VOC were estimated by simulating observed results with an ACSL program. The simulated results are consistent to those estimated by the other research groups. This finding suggests that our newly designed closed system may be a useful apparatus to estimate in vitro metabolic rate constants for VOC.

• 대한한의학방제학회지
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• 제26권1호
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• pp.81-102
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• 2018

Objectives : I analysed daehwangmokdan-tang's compatibility principle by the system of chief, deputy, assistant, and envoy and investigated pharmacological activities by categorizing with chemical components, molecular level, cellular level, animal level and human level based on Korean and Chinese studies for this formula. Methods : Daehwangmokdan-tang's compatibiltity principle was examined by the system of chief, deputy, assistant, and envoy. I looked into studies that presented in Korea from 1956 to 2016 about daehwangmokdan-tang through KOREA INSTITUTE OF ORIENTAL MEDICINE, Korean medicine information system (OASIS) and in Chinese for 20 years about daehwangmokdan-tang through China National Knowledge Infrastructure, CNKI. Then classify into chemical components, molecular level, cellular level, animal level and human level to analyse. Results : According to the system of chief, deputy, assistant, and envoy, chief herb is Rhei Radix et Rhizoma and Moutan Cortex, deputy herb is Natrii Sulfas and Persicae Semen, assistant and envoy herbs are Trichosanthis Semen. The amount of extraction of paeonol, total anthraquinone, and conjugated anthraquinone from daehwangmokdan-tang with the formulation of the system of chief, deputy, assistant, and envoy was the highest, and in the formulation of chief herb and deputy herb, the extraction amount of paeonol and conjugated anthraquinone was the lowest. With other formulations, the amount of extraction of total anthraquinone and conjugated anthraquinone was improved, although the degree was different. In particular, when it is blended with Persicae Semen as a deputy herb, the extraction amount of total anthraquinone and conjugated anthraquinone of Rhei Radix et Rhizoma as a chief herb is greatly increased, and the extraction amount of paeonol is rather different, but it is lowered. It was found that the amount of Mg Ca K Na in daehwangmokdan-tang was the highest. Pharmacological activities can be detected in inflammatory mediators and enzymes for molecular level. For cellular level, it can be determined in lipopolysaccharide (LPS)-stimulated RAW 264.7 cell line. In mouse and rats for animal level and human level, in inflammatory diseases (acute appendicitis, acute pancreatitis, acute cholecystitis, acute abdominal disease, ect.), pharmacological activities was caught. Conclusions : From the above results, daehwangmokdan-tang is composed in line with the system of chief, deputy, assistant, and envoy, suggesting that there is certain rationality and scientific. Pharmacological activities of daehwangmokdan-tang are effective to anti-inflammation, improvement of sepsis, analgesic, muscle relaxation, and improvement of intestinal flora and its metabolites. Daehwangmokdan-tang is consistent with the action of diuresis and anti-inflammation in terms of the content of elements, suggesting that there is action of purging fire and removing blood stasis, defecation detoxification, cooling blood and clearing heat and activating blood and dispersing stasis.