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조황의,안수연,손인섭,황경화,김선춘,우미희,이승호,손종근,홍진태,문동철 한국생약학회 2011 Natural Product Sciences Vol.17 No.2
A high-performance liquid chromatography-electrospray ionization-tandem mass spectrometric method was developed to determine simultaneously eight marker constituents of Forsythiae fructus, and subsequently applied it to classify its two botanical origins. The marker compounds of Forsythia suspensa were phillyrin, pinoresinol, phillygenin, lariciresinol and forsythiaside; those of F.viridissima were arctiin, arctigenin and matairesinol. Separation of the eight analytes was achieved on a phenyl-hexyl column (150 ? 2.0 mm i.d., 3 mm) using gradient elution with the mobile phase: (A) 10% acetonitrile in 0.5% acetic acid, (B) 40% aqueous acetonitrile. A few fragment ions specific to the types of lignans, among the product ions generated by collisonally induced dissociation (CID) of molecular ion clusters, such as [M-H]- or [M+OAc]- were used not only for fingerprinting analysis but for the quantification of each epimer by using multiple-reaction monitoring mode. It was shown good linearity (r2 ? 0.9998) over the wide range of all analytes; intra- and inter-day precisions (RSD, %) were within 9.14% and the accuracy ranged from 84.3 to 115.1%. The analytical results of 40 drug samples, combined with multivariate statistical analyses - principal component analysis (PCA) and hierarchical cluster analysis (HCA) - clearly demonstrated the classification of the test samples according to their botanical origins. This method would provide a practical strategy for assessing the authenticity or quality of the herbal drug.
속단(Dipsaci Radix) 중 Asperosaponins 및 Iridoid glycosides의 LC-ESI-MS에 의한 동시분석
조황의,손인섭,김선춘,손건호,우미희,문동철 한국생약학회 2012 생약학회지 Vol.43 No.2
Dipsaci Radix (Dipsacaceae) has been used as a tonic, an analgesic, anti-inflammatory and anti-complement agents in traditional herbal medicine for the therapy of low back pain, knee pain, rheumatic arthritis, traumatic hematoma, and bone fractures. A high-performance liquid chromatography-electrospray ionization-mass spectrometric method (HPLC-ESI-MS) was developed for the simultaneous quantitation method of the five compounds from the herbal drug: asperosaponin VI and asperosaponin XII (terpene glycosides), sweroside, loganin and dipsacus A(iridoid glycosides). HPLC separation of the analytes was achieved on a C18 column (150 × 2.0 mm i.d., 5 µm) using the aqueous methanol containing 5 mM ammonium acetate with gradient flow of the mobile phase. Detection of the analytes was performed by positive ion electrospray ionization, and selected ion monitoring was used for data acquisition using m/z corresponding molecular adduct ion, [M+NH-4]^+and [M+H]^+. Calibration graphs showed good linearity (r^2= 0.9997) over the wide range of the analytes; intra- and inter-day precisions (RSD, %) were within 9.1% and the accuracy between 94.0 - 111.0%. Recoveries of the analytes through the assay procedure were in the range of 93.7 - 110.8%. Analytical results of the herbal drugs of Dipsaci Radix (17 samples) show wide distribution of the five marker compounds and clear difference of the species from Phlomidis Radix (4 samples). The developed method would provide a practical guide for the quality control of the herbal drug.
DCM2와 Rubrene이 첨가된 TPD/Alq_3 유기 전계발광 소자의 발광 특성
조황신,이민욱,경충현,양해석 中央大學校 基礎科學硏究所 2001 基礎科學硏究所 論文集 Vol.15 No.-
TPD/ALq_3 organic electroluminescent(EL) devices doped with DCM2 and/or rubrene are fabricateed. Luminescent characteristics of these EL devices are investigated. It is found that TPD/ALq_3:DCM2,rubrene EL devices, as compared to TPD/ALq_3:DCM2 EL devices, have lower threshold voltages and higher EL efficiencies as well as reduced intensity of emission peak due to ALq_3 in EL spectra. These improvements in EL characteristics upon rubrene codoping can be attributed to the direct formation of rubrene excitons as well as th the possible energy transfer from rubren to DCM2.