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Minglei Tian,노경호,Shengnan Li 한국화학공학회 2011 Korean Journal of Chemical Engineering Vol.28 No.2
Two kinds of ionic liquid, 1-Hexyl-3-methylimidazolium tetrafluoroborate ([Hmim][BF_4]) and 1-Methyl-3-octylimidazolium tetrafluoroborate ([Omim][BF_4]), were used as additives in the linear solvation energy relationships (LSERs) model to investigate the fundamental chemical interactions governing the retention of nine aromatic compounds in acetonitrile/water mobile phases on a C18 column. The effects of the [Hmim][BF_4] and [Omim][BF_4] were compared and the ability of the LSERs to account for the chemical interactions underlying solute retention was shown. A comparison of predicted and experimental retention factors suggests that LSER formalism is able to reproduce adequately the experimental retention factors of the solutes studied in the different experimental conditions investigated.
Minglei Tian,Hongyuan Yan,노경호 한국생물공학회 2008 Biotechnology and Bioprocess Engineering Vol.13 No.6
Simultaneous extraction and separation of liquiritin, glycyrrhizic acid, and glabridin from licorice were developed by liquid-liquid extraction with liquid chromatography separation. By utilizing different extraction solvents, procedures, and times, the optimum extraction conditions were established. The extracts of licorice were separated and determined using a C₁8 column with a mobile phase consisting of acetonitrile-water (containing 1.0% acetic acid) with a gradient elution of 0~10 min from 20:80 to 60:40 (v/v). Preparative columns with different packing sizes were investigated to isolate the three compounds from the extracts of licorice. The 12 μm chromatographic column showed better separation for the three compounds from licorice. 0.29 mg/g for liquiritin, 1.43 mg/g for glycyrrhizic acid, and 0.07 mg/g for glabridin were obtained and the recoveries were 80.8, 89.7, and 72.5%, respectively.
Tian, Minglei,Bi, Wentao,Row, Kyung Ho John Wiley Sons, Ltd. 2012 Journal of chemical technology and biotechnology Vol.87 No.2
<P><B>Abstract</B></P><P><B>BACKGROUND:</B> Multi‐phase extraction is a novel method for the simultaneous extraction and separation of myricetin from <B><I>Chamaecyparis obtusa</I></B>. In this research, an amino ionic liquid‐modified MCM‐41 was used as the sorbent and the sample was packed with it into a cartridge. A fixed volume of solvent was then use to extract the target compound with several repetitions and to remove the myricetin to the sorbent. The washing and elution of solvent were investigated.</P><P><B>RESULTS:</B> FT‐IR and element contents tests confirmed that the ionic liquid groups were successfully immobilized on MCM‐41. 0.184 mg myricetin was extracted with five repetitions of 1.0 mL methanol. Then 2.0 mL <I>n</I>‐hexane and water were removed all the interference and 1.0 mL methanol was purified 0.1 mg myricetin from 0.2 g ionic liquid‐modified MCM‐41.</P><P><B>CONCLUSION:</B> Base on a comparison with traditional extraction methods, the low deviation error (3.16%), small amount of solvent required, highly selective separation and stability of the proposed method justify continuing its development. Copyright © 2011 Society of Chemical Industry</P>
Tian, Minglei,Yan, Hongyuan,Row, Kyung Ho Taylor Francis 2009 Analytical letters Vol.43 No.1
<P> The new ionic liquid-modified polymer sorbent was developed by surface chemical modification of the synthesized polymer particles using ionic liquids. The obtained ionic liquid-modified polymer was successfully used as a special sorbent in a solid-phase extraction (SPE) process to isolate caffeine and theophylline from green tea. A comparison of different SPE cartridges using the blank polymer, C18, and ionic liquid-modified polymer revealed that the highest recovery was obtained using ionic liquid-modified polymer sorbent. Quantitative analysis was carried out by using a C18 column (5 µm, 150 × 4.6 mm) as an analytical column. Good linearity was obtained from 5 × 10-4 to 0.5 mg/mL (r2>0.999) for the two analytes with relative standard deviations <4.5%.</P>
Molecularly Imprinted Polymer for Solid‐Phase Extraction of Ecteinascidin 743 from Sea Squirt
Tian, Minglei,Li, Shengnan,Row, Kyungho WILEY‐VCH Verlag 2012 Chinese journal of chemistry Vol.30 No.1
<P><B>Abstract</B></P><P>Ecteinascidin 743 from sea squirt is one of the most original anti‐tumoral activity compounds, as proven by the Natural Cancer Institute. Ecteinascidin 743 could be obtained with traditional liquid extraction, but it should be purified and separated from the extract. A molecularly imprinted solid‐phase extraction procedure was developed for the selective separation. Ecteinascidin 743 was used as the template and the polymer was synthesized in a methanol environment. Water and <I>n</I>‐hexane as the washing solvents can eliminate most of the interference. Good linearity and low relative standard deviations (less than 4.39%) justify its continuing development.</P>
Minglei Tian,노경호 대한화학회 2008 Bulletin of the Korean Chemical Society Vol.29 No.5
In this study, 8 solutes (aniline, caffeine, p-cresol, ethyl benzene, methylparaben, phenol, pyridine, and toluene) have been tested in terms of linear solvation energy relationships (LSER). Several micellar liquid chromatography (MLC) systems using cationic surfactant cetyltrimethylammonium bromide (CTAB) and a mixture of water with (methanol, n-propanol, and n-butanol) modifiers were characterized using the LSER solvation parameter model. The effects of the surfactant and modifier concentration on the retention in MLC were discussed. LSER model had demonstrated high potential to predict retention factors with high squared correlation coefficients (r2 > 0.99). A comparison of predicted and experimental retention factors suggests that LSER formalism is able to reproduce adequately the experimental retention factors of the solutes studied in the different experimental conditions investigated. This model is a helpful tool to understand the solute-surfactant interactions and evaluate the retention characteristic of micellar liquid chromatography.
Tian, Minglei,Row, Kyung Ho Taylor Francis 2009 Journal of liquid chromatography & related technol Vol.33 No.2
<P> The simultaneous extraction and separation of martrine, sophoridine and sophocarpine from Sophora flavescens Ait by RP-HPLC was developed by liquid-liquid extraction. The optimum extraction conditions were established using different extraction solvents, procedures and time. The extracts were separated and determined using a C18 column with methanol/water/diethylamine (55/45/0.10, v/v) as the mobile phase. Different preparative columns with different packing sizes were used to isolate the three compounds from the extracts, and the column with a 12 μm particle size showed better separation. The amounts and recovery of sophocarpine, sophoridine and martrine obtained were 0.081 mg/g, 0.031 mg/g and 0.051 mg/g, and 85.38%, 87.14% and 76.5%, respectively.</P>
Extraction of Glycyrrhizic Acid and Glabridin from Licorice
Tian, Minglei,Yan, Hongyuan,Row, Kyung Ho Molecular Diversity Preservation International (MD 2008 INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES Vol.9 No.4
<P>The extraction and separation conditions of glycyrrhizic acid and glabridin from licorice were investigated. By changing the different extraction solvents, procedures, times and temperature, the optimum extraction condition was established: the used of ethanol/water (30:70, v/v) as an extraction solvent, and 60 min dipping time under 50°C. The extracts of licorice were separated and determined by reversed-phase high performance liquid chromatography with a methanol/water (70:30, v/v, containing 1% acetic acid) as the mobile phase. Under the optimum extraction condition, 2.39 mg/g of glycyrrhizic acid and 0.92 mg/g of glabridin were extracted from Chinese licorice and the recoveries were 89.7% and 72.5% respectively.</P>