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B16F10 Melanoma 세포에서 홍지네 고사리 추출물의 Tyrosinase 활성과 Melanin 생성에 미치는 영향
구연수(Yeon-Su Koo),박태진(Taejin Park),심지한(Ji Han Sim),김민선(Min-Seon Kim),김승영(Seung-Young Kim) 한국생물공학회 2020 KSBB Journal Vol.35 No.3
In this study, we investigated the effect of Dryopteris erythrosora extract on anti-oxidation and tyrosinase activity and melanin production as natural products of functional cosmetics. Melanin contents of B16F10 melanoma cells were decreased by 10%, 21%, and 24% in a dose-dependent manner, upon Dryopteris erythrosora extract treatment at 50, 100, and 200 ㎍/mL, respectively. Concentration of 200 ㎍/mL of Dryopteris erythrosora extract especially induced greater decreases in tyrosinase activity. As a result, Dryopteris erythrosora extract showed a 70% reduction in concentration of 200 ㎍/mL. Dryopteris erythrosora extract suppressed expression of tyrosinase, tyrosinase related protein-1 (TRP-1), tyrosinase related protein-2 (TRP-2), and microphthalmia-associated transcription factor (MITF) in B16F10 melanoma cells. Concentration of 200 μg/mL of Dryopteris erythrosora extract especially induced greater decreases in tyosidase activity and melanogenic enzyme protein expressions. This results indicate that Dryopteris erythrosora extract inhibits melanin synthesis and tyrosinase activity, and Dryopteris erythrosora extract may be an ideal candidate as a skin whitening agent.
생물전환 기법을 적용한 접시꽃 callus 추출물의 항염증 활성
구연수 ( Yeon-su Koo ),박태진 ( Tae-jin Park ),김정환 ( Jung-hwan Kim ),김승영 ( Seung-young Kim ) 한국응용생명화학회 2023 Journal of Applied Biological Chemistry (J. Appl. Vol.66 No.-
Biorenovation is a biotransformation method that converts the structure of chemical compounds and natural product through biocatalytic metabolism of microorganism and could enhance biological effectiveness and mitigate cytotoxicity compared to its substrates. Althaea rosea L. has been used as oriental medicine and is known for physiological efficacies such as anti-urolithiatic, anti-inflammatory, and anti-cancer activities. A. rosea L. callus, the plant tissue grown to protect its wound, has been reported to have antioxidant and whitening effects. However, mechanisms of its other activity such as inflammation have not yet been investigated. In this study, we extracted A. rosea L. callus (AR) and produced biorenovated AR (ARBR), and then analyzed anti-inflammatory effect in Lipopolysaccharide-induced RAW 264.7 macrophage at 50, 100, 200 μg/mL of ARBR. As a result of inhibition test of nitric oxide production, it was found that ARBR was superior to AR without apparent toxicity. Furthermore, ARBR significantly inhibited production of prostaglandin E<sub>2</sub>, inducible nitric oxide synthase, cyclooxygenase-2 and pro-inflammatory cytokines including Tumor necrosis factor-α, Interleukin-6, Interleukin-1β in a concentration-dependent manner. In conclusion, we suggest that ARBR could regulate the excessive inflammatory response to an appropriate level and be a promising material for functional cosmetics and pharmaceuticals.
고전류밀도에서 첨가제에 따른 구리도급의 표면 특성 연구
심진용,문윤성,허기수,구연수,이재호,Shim, Jin-Yong,Moon, Yun-Sung,Hur, Ki-Su,Koo, Yeon-Soo,Lee, Jae-Ho 한국마이크로전자및패키징학회 2011 마이크로전자 및 패키징학회지 Vol.18 No.1
전류밀도는 전기도급법에서 생산성과 직접적인 연관이 있고, 생산성의 증가를 위해선 고전류밀도가 필요하다. 회전전극(RDE)의 회전 속도를 증가시키면 고유속을 얻을 수 있다. 유속 조절을 위해 회전전극과 원통형 회전 전극을 사용하였고, 전압과 전류의 관계를 알아보기 위해 정전류, 정전압 실험과 linear sweep voltammetry 실시하였다. 회전 전극의 회전 속도가 400 rpm이상 조건에서, 수소가 발생하지 않고 1000 A/$m^2$이상의 최대전류멸도가 가능하였다. $25^{\circ}C$와 $62^{\circ}C$ 조건에서 구리의 확산계수는 각각 $5.5{\times}10^6\;cm^2\;s^{-1}$와 $10.5{\times}10^6\;cm^2\;s^{-1}$로 계산되었다. 수소가 발생하지 않으면서 안정적으로 구리를 전착할 수 있는 조건은 -0.05 V (vs Ag/AgCl)이었다. 첨가제인 glue와 thiourea-를 넣음으로써 구리의 침상성장을 막을 수 있었다. 표면 거칠기는 UV-Vis Spectrophotometer를 아용하여 분석되었다. 600 nm 영역에서 반사도는 측정 되었고 표면 거철기가 개선될수록 표면 반사도가 증가하였다. The current density in copper electroplating is directly related with the productivity and then to increase the productivity, the increase in current density is required. To obtain the high mass flow rate, rotating disk electrode(RDE) was employed. High rotational speed in RDE can increase the mass flow rate and then high speed electroplating was possible using RDE to control mass flow. Two types of cathode were used. One is RDE and another is rotating cylindrical electrode(RCE). A constant-current, constant-voltage and linear sweep voltammetry were applied to investigate current and voltage relationship. The maximum current density without evolution of hydrogen gas was increased with rotational speed. Over 400 rpm, maximum current density was higher than 1000 A/$m^2$. The diffusion coefficients of copper calculated from the slope of the plots are $5.5{\times}10^6\;cm^2\;s^{-1}$ at $25^{\circ}C$ and $10.5{\times}10^6\;cm^2\;s^{-1}$ at $62^{\circ}C$. The stable voltage without evolution of hydrogen gas was -0.05 V(vs Ag/AgCl). Additives were added to prevent dendritic growth on cathode deposits. The surface roughness was analyzed with UV-Vis Spectrophotometer. The reflectance of the copper surface over 600 nm was measured and was related with the surface roughness. As the surface roughness improved, the reflectance was also increased.