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Lee, Jaemin,Jung, Byung-Jun,Lee, Sang Kyu,Lee, Jeong-Ik,Cho, Hoon-Je,Shim, Hong-Ku Wiley Subscription Services, Inc., A Wiley Company 2005 Journal of polymer science Part A, Polymer chemist Vol.43 No.9
<P>We report here the synthesis via Suzuki polymerization of two novel alternating polymers containing 9,9-dioctylfluorene and electron-withdrawing 4,4′-dihexyl-2,2′-bithiazole moieties, poly[(4,4′-dihexyl-2,2′-bithiazole-5,5′-diyl)-alt-(9,9-dioctylfluorene-2,7-diyl)] (PHBTzF) and poly[(5,5′-bis(2″-thienyl)-4,4′-dihexyl-2,2′-bithiazole-5″,5″-diyl)-alt-(9,9-dioctylfluorene-2,7-diyl)] (PTHBTzTF), and their application to electronic devices. The ultraviolet–visible absorption maxima of films of PHBTzF and PTHBTzTF were 413 and 471 nm, respectively, and the photoluminescence maxima were 513 and 590 nm, respectively. Cyclic voltammetry experiment showed an improvement in the n-doping stability of the polymers and a reduction of their lowest unoccupied molecular orbital energy levels as a result of bithiazole in the polymers' main chain. The highest occupied molecular orbital energy levels of the polymers were −5.85 eV for PHBTzF and −5.53 eV for PTHBTzTF. Conventional polymeric light-emitting-diode devices were fabricated in the ITO/PEDOT:PSS/polymer/Ca/Al configuration [where ITO is indium tin oxide and PEDOT:PSS is poly(3,4-ethylenedioxythiophene) doped with poly(styrenesulfonic acid)] with the two polymers as emitting layers. The PHBTzF device exhibited a maximum luminance of 210 cd/m<SUP>2</SUP> and a turn-on voltage of 9.4 V, whereas the PTHBTzTF device exhibited a maximum luminance of 1840 cd/m<SUP>2</SUP> and a turn-on voltage of 5.4 V. In addition, a preliminary organic solar-cell device with the ITO/PEDOT:PSS/(PTHBTzTF + C<SUB>60</SUB>)/Ca/Al configuration (where C<SUB>60</SUB> is fullerene) was also fabricated. Under 100 mW/cm<SUP>2</SUP> of air mass 1.5 white-light illumination, the device produced an open-circuit voltage of 0.76 V and a short-circuit current of 1.70 mA/cm<SUP>2</SUP>. The fill factor of the device was 0.40, and the power conversion efficiency was 0.52%. © 2005 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 43: 1845–1857, 2005</P> <B>Graphic Abstract</B> <P>Two novel alternating polymers based on fluorene and electron-withdrawing bithiazole, poly[(4,4′-dihexyl-2,2′-bithiazole-5,5′-diyl)-alt-(9,9-dioctylfluorene-2,7-diyl)] (PHBTzF) and poly[(5,5′-bis(2″-thienyl)-4,4′-dihexyl-2,2′-bithiazole-5″,5″-diyl)-alt-(9,9-dioctylfluorene-2,7-diyl)] (PTHBTzTF), were synthesized by Suzuki polymerization. The physical and optical properties of the polymers were carefully characterized. The addition of bithiazole to the polymers' main chain not only reduced the lowest unoccupied molecular orbital energy levels of the polymers but also improved their n-doping stability. Polymeric light-emitting-diode devices and organic solar-cell devices with the polymers as active layers showed the potential of these kinds of materials for use in organic electronic devices. <img src='wiley_img/0887624X-2005-43-9-POLA20659-gra001.gif' alt='wiley_img/0887624X-2005-43-9-POLA20659-gra001'> </P>
Jaemin Lee,Sunghun Cho,Sanghoon Yang,Myoung-Hee Lee,Eun Ju Cho,Sanghyun Lee 한국약용작물학회 2015 한국약용작물학술대회 발표집 Vol.2015 No.05
To evaluate therapeutic efficacy of aldose reductase (AR) inhibition, the seeds of Perilla frutescens var. japonica (PF) were tested for inhibition of AR. The stepwise polarity fractions of PF were tested. The CH2Cl2 and EtOAc fractions showed highest activities (IC50 5.47 and 3.63 μg/mL, respectively). Compounds 1-5 were isolated from the CH2Cl2 and EtOAc fractions by silica-gel and LH-20 Sephadex. Their structures were elucidated as β-sitosterol (1), diosmetin (2), kaempferol (3), luteolin (4), and apigenin (5). Compounds 1-5 were exhibited AR inhibitory. Among them, luteolin (4) and apigenin (5) exhibited AR inhibitory activities (IC50 0.40 and 1.10 μg/mL, respectively). Our results demonstrated that PF could be a worthy natural source for curing against diabetic complications.
Lee, Won-Il,Park, Younghyeon,Park, Jaemin,Shrivastava, Sajal,Son, Young-Min,Choi, Hak-Jong,Lee, Jaelin,Jeon, Byeungwoo,Lee, Heon,Lee, Nae-Eung The Royal Society of Chemistry 2019 Lab on a chip Vol.19 No.8
<P>A key challenge for realizing mobile device-based on-the-spot environmental biodetection is that a biosensor integrated with a fluid handling sensor cartridge must have acceptable accuracy comparable to that of conventional standard analytical methods. Furthermore, the user interface must be easy to operate, technologically plausible, and concise. Herein, we introduced an advanced smartphone imaging-based fluorescence microscope designed for Hg<SUP>2+</SUP> monitoring by utilizing a biosensor cartridge that reduced user intervention <I>via</I> time-sequenced passive fluid handling. The cartridge also employed a metal-nanostructured plastic substrate for complementing the fluorescence signal output; this helped the realization of high-accuracy detection, in which a ratiometric dual-wavelength detection method was applied. Using 30 samples of Hg<SUP>2+</SUP>-spiked wastewater, we showed that our device, which has a detection limit of ∼1 pM, can perform analytical assays accurately. The detection results from our method were in good linearity and agreement with those of conventional standard methods. We conclude that the integration of a simple-to-use biosensor cartridge, fluorescence signal-enhancing substrate, dual-wavelength detection, and quantitative image data processing on a smartphone has great potential to make any population accessible to small-molecule detection, which has been performed in centralized laboratories for environmental monitoring.</P>
Lee, Dong Gu,Lee, Jaemin,Kim, Kyung-Tack,Lee, Sang-Won,Kim, Young-Ock,Cho, Ik-Hyun,Kim, Hak-Jae,Park, Chun-Gun,Lee, Sanghyun The Korean Society of Ginseng 2018 Journal of Ginseng Research Vol.42 No.1
Background: The Panax ginseng plant is used as an herbal medicine. Phytosterols of P. ginseng have inhibitory effects on inflammation-related factors in HepG2 cells. Methods: Phytosterols (e.g., stigmasterol and ${\beta}$-sitosterol) in the roots of P. ginseng grown under various conditions were analyzed using high-performance liquid chromatography. The P. ginseng roots analyzed in this study were collected from three cultivation areas in Korea (i.e., Geumsan, Yeongju, and Jinan) and differed by cultivation year (i.e., 4 years, 5 years, and 6 years) and production process (i.e., straight ginseng, red ginseng, and white ginseng). Results: The concentrations of stigmasterol and ${\beta}$-sitosterol in P. ginseng roots were 2.22-23.04 mg/g and 7.35-59.09 mg/g, respectively. The highest concentrations of stigmasterol and ${\beta}$-sitosterol were in the roots of 6-year-old P. ginseng cultivated in Jinan (82.14 mg/g and 53.23 mg/g, respectively). Conclusion: Six-year-old white ginseng and white ginseng cultivated in Jinan containing stigmasterol and b-sitosterol are potentially a new source of income in agriculture.
Lee, Ah Young,Wu, Ting Ting,Hwang, Bo Ra,Lee, Jaemin,Lee, Myoung-Hee,Lee, Sanghyun,Cho, Eun Ju The Korean Society of Applied Pharmacology 2016 Biomolecules & Therapeutics(구 응용약물학회지) Vol.24 No.3
Neurodegenerative diseases are often associated with oxidative damage in neuronal cells. This study was conducted to investigate the neuro-protective effect of methanolic (MeOH) extract of Perilla frutescens var. japonica and its one of the major compounds, rosmarinic acid, under oxidative stress induced by hydrogen peroxide ($H_2O_2$) in C6 glial cells. Exposure of C6 glial cells to $H_2O_2$ enhanced oxidative damage as measured by 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide and thiobarbituric acid-reactive substance assays. The MeOH extract and rosmarinic acid prevented oxidative stress by increasing cell viability and inhibiting cellular lipid peroxidation. In addition, the MeOH extract and rosmarinic acid reduced $H_2O_2-indcued$ expression of inducible nitric oxide synthase (iNOS) and cyclooxygenase-2 (COX-2) at the transcriptional level. Moreover, iNOS and COX-2 protein expression was down-regulated in $H_2O_2-indcued$ C6 glial cells treated with the MeOH extract and rosmarinic acid. These findings suggest that P. frutescens var. japonica and rosmarinic acid could prevent the progression of neurodegenerative diseases through attenuation of neuronal oxidative stress.
Ginsenoside Rg12, a new dammarane-type triterpene saponin from Panax ginseng root
Lee, Dong Gu,Lee, Jaemin,Cho, Ik-Hyun,Kim, Hak-Jae,Lee, Sang-Won,Kim, Young-Ock,Park, Chun-Gun,Lee, Sanghyun The Korean Society of Ginseng 2017 Journal of Ginseng Research Vol.41 No.4
Background: Panax ginseng has been used as Korean medicine for various diseases. It has antioxidant, hypotensive, sedative, analgesic, and endocrine activities. Dammarane-type triterpenes from the plant have various beneficial effects. Methods: A dammarane-type triterpene saponin was isolated from P. ginseng root through chromatography such as repeated column chromatography and medium pressure liquid chromatography. Results and conclusion: New dammarane-type triterpene saponin was isolated for the first time from nature. The structure was elucidated as ginsenoside Rg12 (1) based on spectral data. There may be good materials from P. ginseng for the development of industrial applications such as nutraceutical, pharmaceutical, and cosmeceutical purposes.