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Capillary Electrophoretic Determination of Jinggangmycin A in Formulations Using Direct UV Detection 被引量:1
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作者 Jin HE Xin LIU Yi Shi LIU Zi Niu YU 《Chinese Chemical Letters》 SCIE CAS CSCD 2005年第11期1511-1514,共4页
A simple, fast and reliable method was developed for the analysis of jinggangmycin A (validamycin A) in commercial formulations. The running buffer used was acetate buffer (100 mmol/L, pH 4.7) with 15 kV as the ap... A simple, fast and reliable method was developed for the analysis of jinggangmycin A (validamycin A) in commercial formulations. The running buffer used was acetate buffer (100 mmol/L, pH 4.7) with 15 kV as the applied voltage. The detection was achieved by using direct UV mode at 200 nm and the detection limit was 0.2 μg/mL. Linearity in the concentration range of 5-500 μg/mL was excellent (RE 〉 0.999). The run-to-run repeatability (n = 3), as expressed by the relative standard deviation (RSD) for migration times and peak areas were less than 0.5% and 3.0% respectively. The mean recovery ranged from 97.2% to 101.4%. 展开更多
关键词 Jinggangmycin A validamycin A capillary zone electrophoresis direct uv detection.
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NON-AQUEOUS REVERSED PHASE HPLC WITH LOW-WAVELENGTH UV DETECTION FOR TRIGLYCERIDE ANALYSIS
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作者 Yi Cheng LONG Wan Zhen LU 《Chinese Chemical Letters》 SCIE CAS CSCD 1991年第5期393-396,共4页
Glycerides are first separated to classes of triglycerides(TGs), diglycerides(DGs) and monoglycerides(MGs) by normal phase HPLC on silica gel column. Individual triglyceride separation is then achieved by non-aqueous ... Glycerides are first separated to classes of triglycerides(TGs), diglycerides(DGs) and monoglycerides(MGs) by normal phase HPLC on silica gel column. Individual triglyceride separation is then achieved by non-aqueous reversed phase(NARP) HPLC on C_(18) column with UV detection at 215nm. 展开更多
关键词 HPLC TG NON-AQUEOUS REVERSED PHASE HPLC WITH LOW-WAVELENGTH uv detection FOR TRIGLYCERIDE ANALYSIS NARP uv
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Capillary Zone Electrophoresis of Native Amino Acids with Indirect Ultraviolet Detection
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作者 王洪 顾峻岭 +2 位作者 傅若农 胡汉芳 丁天惠 《Journal of Beijing Institute of Technology》 EI CAS 1998年第1期43-48,共6页
Aim To strdy the separation of native amino acids using capillary zone electro- pboresis (CZE) with indirect ultraviolet detecition. Methods 13 native amino acids were sepa- rated by capillary electrophoresis with ind... Aim To strdy the separation of native amino acids using capillary zone electro- pboresis (CZE) with indirect ultraviolet detecition. Methods 13 native amino acids were sepa- rated by capillary electrophoresis with indirect detection . The experiments were carried out with homemade CE apparatus under the following operating conditior conditions: a fused-silica capillary col- umn of 50.0cm effect length and of 75m i.d. was used. 7 organic acids were used as BGAE, and a positive potential of separation in CZE with indirect detection. After optimizing for l3 native amino acids were established. Conclusion The choice of BGAe is an important factor influencing the efficiency of separation in CZE with indiect detection .After optimizing the separation conditions a baseline separation for 13 native amino acids is obtained. 展开更多
关键词 CZE indirect uv detection native amino acid
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Detection of Three Common Organic Explosives Using Capillary Electrophoresis
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作者 Hong Zhou Zhanfang Liu +5 位作者 Yuyou Sun Ling Zeng Hongcheng Mei Jianzhong Xu Baoyuan Guo Hongxia Hao 《Journal of Materials Science and Chemical Engineering》 2016年第6期17-25,共9页
In this article, a detection method for organic explosives by capillary electrophoresis (CE) is developed based on previous detection techniques. Firstly, a buffer solution consisting of 50 mmol·L-1 sodium dodecy... In this article, a detection method for organic explosives by capillary electrophoresis (CE) is developed based on previous detection techniques. Firstly, a buffer solution consisting of 50 mmol·L-1 sodium dodecyl sulfate (SDS), 20 mmol·L-1 sodium tetraborate and 5% methanol was prepared and the UV detection in this buffer solution was conducted for three common organic explosives, including TNT, DNT and PETN. Then, the capillary UV detection method was investigated in terms of the transition time repeatability, the linear relationship between mass concentration and peak area and the limit of detection. The results revealed good reliability and stability of this method. In addition, these samples were characterized by photodiode array detector (PDA) to verify the qualitative results of UV detection. 展开更多
关键词 Organic Explosives Capillary Electrophoresis (CE) uv detection
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A 4×4 metal-semiconductor-metal rectangular deep-ultraviolet detector array of Ga_(2)O_(3)photoconductor with high photo response 被引量:2
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作者 Zeng Liu Yu-Song Zhi +8 位作者 Mao-Lin Zhang Li-Li Yang Shan Li Zu-Yong Yan Shao-Hui Zhang Dao-You Guo Pei-Gang Li Yu-Feng Guo Wei-Hua Tang 《Chinese Physics B》 SCIE EI CAS CSCD 2022年第8期700-704,共5页
A 4×4 beta-phase gallium oxide(β-Ga_(2)O_(3))deep-ultraviolet(DUV)rectangular 10-fingers interdigital metalsemiconductor-metal(MSM)photodetector array of high photo responsivity is introduced.The Ga2O_(3)thin fi... A 4×4 beta-phase gallium oxide(β-Ga_(2)O_(3))deep-ultraviolet(DUV)rectangular 10-fingers interdigital metalsemiconductor-metal(MSM)photodetector array of high photo responsivity is introduced.The Ga2O_(3)thin film is prepared through the metalorganic chemical vapor deposition technique,then used to construct the photodetector array via photolithography,lift-off,and ion beam sputtering methods.The one photodetector cell shows dark current of 1.94 p A,phototo-dark current ratio of 6×10_(7),photo responsivity of 634.15 A·W^(-1),specific detectivity of 5.93×1011cm·Hz1/2·W^(-1)(Jones),external quantum efficiency of 310000%,and linear dynamic region of 108.94 d B,indicating high performances for DUV photo detection.Furthermore,the 16-cell photodetector array displays uniform performances with decent deviation of 19.6%for photo responsivity. 展开更多
关键词 Ga_(2)O_(3) array photodetector MOCVD deep uv detection
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Simultaneous quantification of lopinavir and ritonavir in human plasma by high performance liquid chromatography coupled with UV detection 被引量:1
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作者 KOU HuiJuan YE Min +5 位作者 FU Qiang HAN Yang DU XiaoLi XIE Jing ZHU Zhu LI TaiSheng 《Science China(Life Sciences)》 SCIE CAS 2012年第4期321-327,共7页
High performance liquid chromatography was coupled with UV detection for simultaneous quantification of lopinavir (LPV) and ritonavir (RTV) in human plasma. This assay was sensitive, accurate and simple, and only ... High performance liquid chromatography was coupled with UV detection for simultaneous quantification of lopinavir (LPV) and ritonavir (RTV) in human plasma. This assay was sensitive, accurate and simple, and only used 200μL of plasma sample. Samples were liquid-liquid extracted, and diazepam was used as an internal standard. The chromatographic separation was achieved on a C18 reversed-phase analytic column with a mobile phase of acetonitrile-sodium dihydrogen phosphate buffer (10 mmol L-1, pH 4.80) (60:40, v/v). UV detection was conducted at 205 nm and the column oven was set at 40℃. Calibration curves were constructed between 0,5-20 μg mL-1 for LPV and 0.05-5 μg mL-1 for RTV. The relative standard deviations were 2.16%-3.20% for LPV and 2.12%-2.60% for RTV for intra-day analysis, and 2.34%-4.04% for LPV and 0.31%-4.94% for RTV for inter-day analysis. The accuracy was within 100%+10%. The mean extraction recoveries were 79.17%, 52.26% and 91.35% for RTV, LPV and diazepam, respectively. This method was successfully applied to human plasma samples from patients orally administered a salvage regimen of lopinavir-ritonavir tablets. 展开更多
关键词 LOPINAVIR ritonavir HPLC uv detection human plasma
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Further Study on Separation of DNA Fragments by Capillary Electrophoresis by Quasi-interpenetrating Network of Polyacryamide and Polyvinylpyrrolidone with UV Detection
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作者 王前 许旭 戴立信 《Chinese Journal of Chemistry》 SCIE CAS CSCD 2006年第12期1766-1772,共7页
Quasi-interpenetrating network of polyacrylamide (PAA) and polyvinylpyrrolidone (PVP) had been successfully used for single-base resolution of double-stranded DNA (0.76 for 123 bp/124 bp) and single-stranded DNA... Quasi-interpenetrating network of polyacrylamide (PAA) and polyvinylpyrrolidone (PVP) had been successfully used for single-base resolution of double-stranded DNA (0.76 for 123 bp/124 bp) and single-stranded DNA fragments (0.97 for 123 b/124 b) with UV detection. This quasi-IPN (interpenetrating network) sieving matrix showed low viscosity (23.5 mPa·s at 25 ℃) and decreased with increasing temperature. This polymer also exhibited dynamically coating capacity and could be used in the uncoated capillary. The effects of temperature and electric field strength on the DNA separation of quasi-IPN matrix were also investigated and found that the temperature and electric field strength could markedly affected the mobility behavior of DNA fragments. This polymer matrix has also applied to separate the bigger DNA fragments by capillary electrophoresis with UV detection. Under the denaturing conditions, this matrix separated the samples with last fragment of 1353 base in 40 rain, in which the doublet of 309/310 base was partial separated and the resolution was 0.88. 展开更多
关键词 single-base resolution capillary electrophoresis non-gel sieving uv detection quasi-interpenetrating network POLYACRYLAMIDE POLYVINYLPYRROLIDONE
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离子排斥色谱用于厌氧消化处理的水中脂肪族羧酸的分析(英文)
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作者 Kazuaki ITO Jun SAKAMOTO +7 位作者 Kazuya NAGAOKA Yohichi TAKAYAMA Takashi KANAHORI Hiroshi SUNAHARA Tsuneo HAYASHI Shinji SATO Takeshi HIROKAWA Kazuhiko TANAKA 《色谱》 CAS CSCD 北大核心 2012年第4期369-373,共5页
The analysis of seven aliphatic carboxylic acids(formic,acetic,propionic,iso-butyric,n-butyric,iso-valeric and n-valeric acid) in anaerobic digestion process waters for biogas production was examined by ion-exclusion ... The analysis of seven aliphatic carboxylic acids(formic,acetic,propionic,iso-butyric,n-butyric,iso-valeric and n-valeric acid) in anaerobic digestion process waters for biogas production was examined by ion-exclusion chromatography with dilute acidic eluents(benzoic acid,perfluorobutyric acid(PFBA) and sulfuric acid) and non-suppressed conductivity/ultraviolet(UV) detection.The columns used were a styrene/divinylbenzene-based strongly acidic cation-exchange resin column(TSKgel SCX) and a polymethacrylate-based weakly acidic cation-exchange resin column(TSKgel Super IC-A/C).Good separation was performed on the TSKgel SCX in shorter retention times.For the TSKgel Super IC-A/C,peak shape of the acids was sharp and symmetrical in spite of longer retention times.In addition,the mutual separation of the acids was good except for iso-and n-butyric acids.The better separation and good detection was achieved by using the two columns(TSKgel SCX and TSKgel Super IC-A/C connected in series),lower concentrations of PFBA and sulfuric acid as eluents,non-suppressed conductivity detection and UV detection at 210 nm.This analysis was applied to anaerobic digestion process waters.The chromatograms with conductivity detection were relatively simpler compared with those of UV detection.The use of two columns with different selectivities for the aliphatic carboxylic acids and the two detection modes was effective for the determination and identification of the analytes in anaerobic digestion process waters containing complex matrices. 展开更多
关键词 ion-exclusion chromatography(IEC) strongly and weakly acidic cation-exchange resin columns perfluorobutyric and sulfuric acids eluents non-suppressed conductivity and ultraviolet(uv) detections aliphatic carboxylic acids anaerobic digestion process waters
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Novel elastomeric spiropyran‑doped poly(dimethylsiloxane)optical waveguide for UV sensing
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作者 Camila Aparecida Zimmermann Kof Novignon Amouzou +3 位作者 Dipankar Sengupta Aashutosh Kumar Nicole Raymonde Demarquette Bora Ung 《Frontiers of Optoelectronics》 EI CSCD 2024年第3期1-15,共15页
Novel poly(dimethylsiloxane)(PDMS)doped with two diferent spiropyran derivatives(SP)were investigated as potential candidates for the preparation of elastomeric waveguides with UV-dependent optical properties.First,fr... Novel poly(dimethylsiloxane)(PDMS)doped with two diferent spiropyran derivatives(SP)were investigated as potential candidates for the preparation of elastomeric waveguides with UV-dependent optical properties.First,free-standing flms were prepared and evaluated with respect to their photochromic response to UV irradiation.Kinetics,reversibility as well as photofatigue and refractive index of the SP-doped PDMS samples were assessed.Second,SP-doped PDMS waveguides were fabricated and tested as UV sensors by monitoring changes in the transmitted optical power of a visible laser(633 nm).UV sensing was successfully demonstrated by doping PDMS using one spiropyran derivative whose propagation loss was measured as 1.04 dB/cm at 633 nm,and sensitivity estimated at 115%change in transmitted optical power per unit change in UV dose.The decay and recovery time constants were measured at 42 and 107 s,respectively,with an average UV saturation dose of 0.4 J/cm2.The prepared waveguides exhibited a reversible and consistent response even under bending.The sensor parameters can be tailored by varying the waveguide length up to 21 cm,and are afected by white light and temperatures up to 70℃.This work is relevant to elastomeric optics,smart optical materials,and polymer optical waveguide sensors. 展开更多
关键词 SPIROPYRANS PDMS PHOTOCHROMISM Polymer optical waveguides uv detection
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Preparation of Photo-responsive DNA Supramolecular Hydrogels and Their Application as UV Radiometers
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作者 DING Yuqiao LI Yujie +6 位作者 YANG Bo PAN Yufan CHENG Jiafeng MENG Siwen LIU Dongsheng XU Lijin DONG Yuanchen 《Chemical Research in Chinese Universities》 SCIE CAS CSCD 2023年第1期115-120,共6页
Ultraviolet light(UV)is an essential component of ambient light,but high dose UV would damage genome DNA.While semiconductors and soft materials have been employed to detect the UV,the complex process and the instrume... Ultraviolet light(UV)is an essential component of ambient light,but high dose UV would damage genome DNA.While semiconductors and soft materials have been employed to detect the UV,the complex process and the instrumental requirement have limited the application in daily life.In this study,taking advantage of sequence designability,a series of hydrogels with different gel-sol transition rates was constructed under the same UV intensity by introducing competing hybridization to tune the stability of the molecular network.Through estimating the transition time between each system under UV light irradiation,the intensity of UV could be roughly estimated,which provided a convenient method for the visual detection of UV. 展开更多
关键词 Photo-responsive DNA hydrogel AZOBENZENE Gel-sol transition uv detection
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