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Chiral Separation of Ibuprofen by Supercritical Fluid Chromatography

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Chinese Journal of Chemical Engineering 2005年第6期13卷 741-746页

作者： HAN Soonkoo row Kyungho Center for Advanced Bioseparation Technology and Department of Chemical Engineering Inha University253 Yonghyun-DongNam-KuIncheon 402-751South Korea

用为 enantioselective 化合物的准备的 chiral 固定相(CSP ) 的分离方法广泛地被使用。在这个工作，超级批评液体层析(SFC ) 被建议解决 chiral 混合物。在压力，温度和国际语音学协会的内容与变化为外消旋的布洛芬，保留因素和决定的 ... 详细信息

用为 enantioselective 化合物的准备的 chiral 固定相(CSP ) 的分离方法广泛地被使用。在这个工作，超级批评液体层析(SFC ) 被建议解决 chiral 混合物。在压力，温度和国际语音学协会的内容与变化为外消旋的布洛芬，保留因素和决定的 thechiral 分离决定最佳操作条件(%，由体积)在超级批评 CO_2 ， *** 证明保留因素随温度的压力和减少的增加减少了。保留因素被国际语音学协会的内容也在流动相影响，作为在增加的超级批评液体的国际语音学协会的内容， enantiomers 的保留因素 *** 随优化试验性的条件的 *** 的国际语音学协会的增加变得更坏，有 13MPa,311.15 K 和4% IPAin CO_2 的一个 SFC 过程被获得。当与常规 *** 获得的不对称的峰形相比工作证明发达超级批评液体层析过程对布洛芬 enantiomers 的 chiral 分离合适时， enantiomers 的峰形与超级批评液体层析是对称的。

关键词：超临界液体色谱手性分离布洛芬滞留因子抗炎镇痛药

Adsorption Isotherms of Quercetin and Catechin Compounds on Quercetin-MIP

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Chemical Research in Chinese Universities 2007年第4期23卷 412-416页

作者： row Kyung Ho Center for Advanced Bioseparation Technology and Department of Chemical Engineering Inha University253 Yonghyun-DongNam-KuIncheon 402-751Korea

A molecular imprinted polymer（MIP） was prepared with quereetin as the template and methaerylie acid（MAA） as the functional monomer. Aeetonitrile and methanol were used as the porogen with ethylene glycol dimethaerylate （EGDMA） as the erosslinker and 2,2＇-azobis （ isobutyronitrile ）（ AIBN ） as the initiator. The experimental parameters of the equilibrium isotherms were estimated via linear and nonlinear regression analyses. The linear equadon as the functions of the adsorption concentration of the single compound in its solution and the competitive adsorption of the single compound in its mixed compounds solution was then expressed, and the adsorption equilibrium data were correlated to Langmuir and Freundlich isotherm models. The mixture compounds show competitive adsorption on the specific binding sites of quereetin-MIP. Furthermore, the competitive Langmnir isotherms were applied to the mixture compounds. The adsorption concentrations of quercetin, （＋）eatechin（＋C）, and （-）epieateehin（EC） on the quercetin molecular imprinted polymer were compared. The quercetin-imprinted polymer shows extraordinarily higher adsorption ability for quercetin than for the two eateehin compounds that were also assessed.

关键词： Adsorption isotherm Molecular imprinted polymer Quercetin (+) Catechin (-) Epicatechin

Evaluation of Retention Factors for Nine Solutes with Ionic Liquid Additives via Linear Solvation Energy Relationships

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Chemical Research in Chinese Universities 2010年第4期26卷 532-536页

作者： row Kyung-Ho Department of Chemical Engineering Inha University

A linear solvation energy relationships（LSERs） model was used to examine the fundamental chemical interactions governing the retention of 9 organic compounds on a C18 column by means of reversed-phase high performance liquid cbromatography（RP-HPLC）. Three ionic liquids, 1-hexyl-3-methylimidazolium tetrafluoroborate （[Hmin][BF4]）, 1-butyl-3-methylimidazolium tetrafluoroborate（[Bmin][BF4]） and 1-octyl-3-methylimidazolium tetrafluoroborate（[OMIm][BF4]） as additives, were added to a methanol-water mobile phase. The effects of these three ionic liquids additives on the retention of nine organic compounds were investigated, and a comparison between the predicted and experimental retention factors was made via the LSERs model, which indicated that the LSERs model could be used to reproduce the experimental retention factors of the solutes under different mobile phase conditions. It is also a useful tool for modeling the interactions of the solutes between the stationary and mobile phases and evaluating the retention characteristics of HPLC.

关键词： Retention factor Ionic liquid Additive Mobile phase Model

Preparation of a Hybrid Organic-inorganic Monolith for Extraction and Purification of Quercetin and Myricetin from Chamaecyparis obtusa

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Chemical Research in Chinese Universities 2014年第2期30卷 216-221页

作者： ZHU Tao LEE Yuri row Kyungho School of Chemistry and Chemical Engineering Tianjin University of Technology Tianjin 300384 P.R.China Department of Chemical Engineering Inha University Incheon 402-751 Korea

A new hybrid organic-inorganic monolithic cartridge was synthesized and used as the selective sorbent for the extraction and purification of quercetin and myricetin from Chamaecyparis obtusa via a solid-phase extraction *** morphology of the monolithic material was examined by field emission-scanning electron microscopy and a Brunauer-Emmett-Teller（BET） *** adsorption capacity of the obtained material for quercetin and myricetin was investigated by fitting the adsorption data to four different adsorption equations,of which the LangmuirFreundlich isotherm was selected as the most suitable *** optimized conditions,good calibration curves were observed at nine concentrations ranged from 0.5 μg/mL to 100.0 μg/mL of quercetin and *** extraction recovery ranged from 74.5％ to 84.6％ and the inter-and intra-day relative standard deviations were ＜6％.This type of hybrid monolith has potential for the separation and purification of bioactive compounds from natural plant extracts.

关键词： Extraction Purification Adsorption isotherm Hybrid organic-inorganic monolith Quercetin Myricetin

Optimization and Application of Liquid Chromatography Determination of Dispersive Liquid-liquid Microextraction Purified Astaxanthin in Shrimp Waste

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Chemical Research in Chinese Universities 2013年第3期29卷 429-433页

作者： ZHU Tao row Kyung-ho School of Chemistry and Chemical Engineering Tianjin University of Technology Tianjin 300384 P. R. China Department of Chemical Engineering Inha University Incheon 402-751 Korea

A new molecularly imprinted solid-phase extraction（MISPE） monolithic cartridge was synthesized, and MISPE-DLLME（DLLME=dispersive liquid-liquid microextraction） was developed for purification of astaxanthin in shrimp waste. The eluent（methanol） from MISPE was used as the dispersive solvent in subsequent DLLME for further purifying and enriching the analyte prior to high-performance liquid chromatography（HPLC） analysis. The mobile phase was methanol-acetonitrile-water-dichloromethane（85：5：5：5, volume ratio）, flow rate was 0.7 mL/min and UV wavelength was 476 nm. Under optimal conditions, good linearity was obtained in a range of 0.2--200.0 lug/mL（r2=0.9998） with a limit of detection（LOD） of 0.08 Hg/mL, and the extraction recoveries at three spiked levels ranged from 88.3%--92.5% with a relative standard deviation（RSD） less than 4.3%. Moreover, the mean contents of astaxanthin in the three batches of shrimp waste were 95.9, 85.4 and 77.2 μg/g, respectively. This method combining the advantages of MISPE and DLLME results in high selectivity and low cost, which was applied to determining the astaxanthin level in shrimp waste samples.

关键词： Molecularly imprinted solid-phase extraction Dispersive liquid-liquid microextraction Astaxanthin Shrimp waste

Central Composite Design for Optimized Extraction of Polysaccharides from Undaria pinnatifida

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Chemical Research in Chinese Universities 2012年第4期28卷 620-623页

作者： HEO Hyo-jung row Kyung-ho Department of Chemical Engineering Inha University253 Yonghyun-DongNam-KuIncheon 402-751Korea

Response surface methodology was used to optimize the extraction conditions of polysaccharides from Undaria *** effects of three independent variables,extraction time,extraction temperature and ratio of water to raw material were investigated by a central composite *** experimental data were fitted to a second-order polynomial equation via multiple regression analysis and also examined with the appropriate statistical *** adjusted coefficient of determination（R^2Adj） for the model was *** optimum extraction yield of 30.78% was obtained when the extraction temperature was 95 °C,extraction time was 4.5 h,and the ratio of water to raw material was 35（mL/g）.Under these conditions,validation experiments were done and the mean extraction yield of polysaccharides was 30.79%,which was in good agreement with the predicted model value.

关键词： Undaria pinnatifida Optimization Extraction Polysaccharide Response surface methodology

Extraction of Catechin Compounds from Green Tea with a New Green Solvent

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Chemical Research in Chinese Universities 2014年第1期30卷 37-41页

作者： ZHANG Heng TANG Baokun row Kyungho Department of Chemistry and Chemical Engineering Inha University Incheon 402-751 Korea

An emerging green solvent called a deep eutectic solvent（DES） was applied to the extraction and determination of catechin（C）,（＋）epicatechin gailate（ECG） and （-）epigallocatechin gallate（EGCG） from Chinese green *** evaluating different combinations of them by extraction methods and DESs,a DES-based extraction method was established and optimized by a systematic investigation of the influencing *** a result,a total of 3.629,35.25 or 114.2 mg/g catechin,（＋）epicatechin gallate or （-）epigaliocatechin gallate were extracted respectively under optimal conditions with extraction efficiencies of 82.7％,92.3％ and 97.0％,*** comparing with other common used solvents for extracting catechin compounds,DESs were proved to be potential extraction solvents for bioactive ingredients.

关键词： Deep eutectic solvent Catechin Extraction High performance liquid chromatography

Purification of Astaxanthin from Laminaria japonica by Ionic Liquid-based Monolithic Cartridge

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Chemical Research in Chinese Universities 2012年第3期28卷 406-409页

作者： YOON Chang-hwan row Kyung-ho Department of Chemical Engineering Inha UniversityIncheon 402-751Korea

An effective and accurate method was developed for the extraction of astaxanthin from Laminariajapo- nica with subsequent separation by ionic liquid-based monolithic cartridge. The optimized extraction conditions in- cluding extraction solvent（ethanol）, extraction time（90 min） and ultrasonic power（75 W） were obtained by systema- tical investigation. Chromatographic analysis was performed on a C18 column with ultraviolet（UV） detection at 476 nm, and a solution consisting of methanol/acetonitrile/H2O/dichloromethane（83：6：6：5, volume ratio） was used as the mobile phase at a flow rate of 0.7 mL/min. After ionic liquid-based monolithic solid phase extraction, 17.82 μg/g as- taxanthin was obtained from Laminaria japonica. This ionic liquid-based monolithic cartridge exhibits high affinity and selectivity for astaxanthin, and it can be potentially used as the stationary phase of high performance liquid chromatography（HPLC）.

关键词： Laminariajaponica Astaxanthin Extraction Ionic liquid Cartridge

Extraction and Purification of Depigmenting Agents from Chinese Plants

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Chemical Research in Chinese Universities 2006年第2期22卷 162-167页

作者： AHN So-young row Kyung-ho KIM Eun-ki School of Chemical and Biological Engineering Center for Advanced Bioseparation Technology Inha University Nam-Ku Incheon 402-751 Korea

Depigmenting agents were solvent-extracted and purified by preparative and analytical HPLC from three Chinese plants; Chrysanthemum morifolium Ramat（ Xizang Caijuhua）, Rhodiola sachalinensis, and Terminalia chebula Retzius. Four fractions obtained from the ethyl ether layer of C. m. Rama and two fractions from the ethyl acetate layer of Rhodiola salientness show depigmenting effects. At 8 200, the ethyl acetate layers of Chrysanthemum morifolium Ramat, Rhodiola sachalinensis and the methanol extract of Terminalia chebula Retzius, can inhibit the melanin production of mouse B16 melanoma cells by 92%, 60% and 90%, respectively, whereas 46% inhibition was observed by commercially available depigmenting agents（arbutin）. These results show the potential of these three Chinese plants as a novel resource for depigmenting agents in the cosmetic industry.

关键词： Chrysanthemum Morifolium Ramat Rhodiola Sachalinensis Terminalia Chebula Retzius Melanin Inhibitory Effect HPLC