1
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Fu Q, Dong W, Ge D, Ke Y, Jin Y. Supercritical fluid chromatography based on reversed-phase/ ion chromatography mixed-mode stationary phase for separation of spirooxindole alkaloids. J Chromatogr A 2023; 1705:464163. [PMID: 37348226 DOI: 10.1016/j.chroma.2023.464163] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2023] [Revised: 06/12/2023] [Accepted: 06/14/2023] [Indexed: 06/24/2023]
Abstract
The present paper illustrates the versatility of the supercritical fluid chromatography (SFC) since, for the first time, four spirooxindole alkaloids (SOAs) including two pairs of isomers were separated by using two types of reversed-phase/ ion chromatography (RP/IC) mixed-mode stationary phases. Two mixed-mode stationary phases (C8SAX and C8SCX) was simultaneously provided dispersive and electrostatic interactions, which were suitable for the separation of such alkaloids. This study tried to provide an in-depth understanding of the SFC separation mechanism of the mixed-mode stationary phase through investigation of the impact of changes in mobile phase composition on alkaloids' retention behavior. On C8SAX, due to the strong electrostatic repulsion, there was a very narrow elution window of the alkaloids, of which behaviors were hardly affected by adding diethylamine in mobile phase. When adding formic acid or acidic ammonium formate, the prolonged retention time of alkaloids was presented because of the shielded effect of formate anions on the electrostatic repulsion. In particular, better peak shape and improved resolution were obtained by using acidic ammonium formate due to the deactivation of silanol groups by ammonium cations. On the other hand, both formic acid and acidic ammonium formate can strengthen the electrostatic attraction of C8SCX, causing difficult elution of the alkaloids. Ammonium cations from either the protonated diethylamine or the ionized ammonium formate, were considered as counter ions to effectively mask the electrostatic attraction of C8SCX, to significantly reduce the retention of alkaloids, but improve the resolution. Finally, utilizing two developed SFC methods, i.e., C8SAX with EtOH+ 10 mM acidic ammonium formate in CO2, or C8SCX with EtOH+0.1% diethylamine in CO2, the baseline separation of corynoxeine and isocorynoxeine, rhynchophylline and isorhynchophylline was achieved within 5 min.
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Affiliation(s)
- Qing Fu
- Engineering Research Center of Pharmaceutical Process Chemistry, Ministry of Education, School of Pharmacy, East China University of Science and Technology, Shanghai 200237, PR China
| | - Wenwen Dong
- Engineering Research Center of Pharmaceutical Process Chemistry, Ministry of Education, School of Pharmacy, East China University of Science and Technology, Shanghai 200237, PR China
| | - Dandan Ge
- Engineering Research Center of Pharmaceutical Process Chemistry, Ministry of Education, School of Pharmacy, East China University of Science and Technology, Shanghai 200237, PR China
| | - Yanxiong Ke
- Engineering Research Center of Pharmaceutical Process Chemistry, Ministry of Education, School of Pharmacy, East China University of Science and Technology, Shanghai 200237, PR China
| | - Yu Jin
- Engineering Research Center of Pharmaceutical Process Chemistry, Ministry of Education, School of Pharmacy, East China University of Science and Technology, Shanghai 200237, PR China.
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2
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Ghorbanian M, Asghari S, Tajbakhsh M. A new benzothiazole azo dye colorimetric chemosensor for detecting Pb 2+ ion. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2023; 296:122652. [PMID: 36989695 DOI: 10.1016/j.saa.2023.122652] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/21/2022] [Revised: 03/15/2023] [Accepted: 03/17/2023] [Indexed: 06/19/2023]
Abstract
In this work, a new benzothiazole azo dye sensor (BTS) was synthesized, and its cation binding affinity was studied using the colorimetric method, UV-vis, and 1H NMR spectral data. The results revealed that the sensor BTS exhibits a remarkable tendency for Pb2+ ion to perform spontaneous visual color change from blue (BTS) to pink (BTS + Pb2+), without any color change in the aqueous solutions of other cations such as Hg2+, Cu2+, Al3+, Ni2+, Cd2+, Ag+, Ba2+, K+, Co2+, Mg2+, Na+, Ca2+, Fe2+, and Fe3+ ions. The observed selectivity could be due to the formation of the complex (BTS + Pb2+), which led to a blue shift from 586 nm (BTS) to 514 nm (BTS + Pb2+) in the UV spectrum. The job's plot provided the stoichiometry ratio of the complex (BTS + Pb2+) to be 1:1. The limit of detection (LOD) of BTS for Pb2+ ion sensing was obtained at 0.67 µM. Additionally, the binding constant for BTS toward Pb 2+ ion was studied using the Benesi-Hildebrand equation. As a result of the BTS test paper strips investigations, it was found that the synthesized sensor BTS could be used as a rapid colorimetric chemosensor for the detection of the Pb2+ ions in the distilled, tap, and sea waters.
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Affiliation(s)
- Moein Ghorbanian
- Department of Organic Chemistry, Faculty of Chemistry, University of Mazandaran, Babolsar 47416-95447, Iran.
| | - Sakineh Asghari
- Department of Organic Chemistry, Faculty of Chemistry, University of Mazandaran, Babolsar 47416-95447, Iran.
| | - Mahmood Tajbakhsh
- Department of Organic Chemistry, Faculty of Chemistry, University of Mazandaran, Babolsar 47416-95447, Iran.
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3
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Wood JS, Dal Poggetto G, Wang X, Reibarkh M, Williamson RT, Cohen RD. Quantitative nuclear magnetic resonance of chloride by an accurate internal standard approach. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2023; 61:22-31. [PMID: 36166190 DOI: 10.1002/mrc.5316] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/09/2022] [Revised: 09/21/2022] [Accepted: 09/23/2022] [Indexed: 06/16/2023]
Abstract
Chloride is the most common counterion used to improve aqueous solubility and enhance stability of small molecule active pharmaceutical ingredients. While several analytical techniques, such as titration, HPLC with charged aerosol detection, and ion chromatography, are currently utilized to assay the level of chloride, they have notable limitations, and these instruments may not be readily available. Here, we present a generally applicable 35 Cl solution NMR method to assay the level of chloride in pharmaceutical compounds. The method uses KClO4 as an internal standard for improved accuracy in comparison with external standard methods, and it was found to be robust, linear over three orders of magnitude, precise (<3% RSD), and accurate (<0.5% absolute error).
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Affiliation(s)
- Jared S Wood
- Merck & Co., Inc., Rahway, New Jersey, USA
- Department of Chemistry and Biochemistry, University of North Carolina Wilmington, Wilmington, North Carolina, USA
| | | | - Xiao Wang
- Merck & Co., Inc., Rahway, New Jersey, USA
| | | | - R Thomas Williamson
- Department of Chemistry and Biochemistry, University of North Carolina Wilmington, Wilmington, North Carolina, USA
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4
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Handlovic TT, Wahab MF, Cole HD, Alatrash N, Ramasamy E, MacDonnell FM, McFarland SA, Armstrong DW. Insights into enantioselective separations of ionic metal complexes by sub/supercritical fluid chromatography. Anal Chim Acta 2022; 1228:340156. [PMID: 36126998 PMCID: PMC9504283 DOI: 10.1016/j.aca.2022.340156] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2022] [Revised: 06/29/2022] [Accepted: 07/07/2022] [Indexed: 11/25/2022]
Abstract
Sub/supercritical fluid chromatography (SFC) is a green separation technique that has been used to separate a wide variety of compounds and is proven to be immensely useful for chiral separations. However, SFC is currently not thought to be applicable for ionic compounds due to their low solubility in CO2, even with additives and organic modifiers. Recently, a large amount of research has been centered on octahedral complexes of Ru(II) and Os(II) with bidentate polypyridyl ligands due to their ability to serve in cancer treatment and other biological activities. These compounds exist as the delta (Δ) and lambda (Λ) enantiomers. Previously, similar compounds have been enantiomerically separated using HPLC and capillary electrophoresis, but never with SFC. Cyclofructan-6 (CF6) derivatized with (R)-naphthyl ethyl (RN) groups has been proven to be an effective chiral stationary phase for these separations in HPLC. This column chemistry was expanded to SFC to provide the first chiral separation of a wide variety (23 complexes in total) of ionic octahedral polypyridyl complexes. Unexpected behavior for mixing methanol and acetonitrile as the organic modifier will be discussed, along with the effects of additives. Enantioselectivity on CF6-RN chemistry is shown to be dependent on the conjugation level and rigidity of the metal complexes. Mass transfer kinetic behavior is also shown, and high-efficiency baseline resolved rapid separations are shown for fast screening or quantitation of representative coordination complexes.
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Affiliation(s)
- Troy T Handlovic
- Department of Chemistry and Biochemistry, University of Texas at Arlington, 76019, USA
| | - M Farooq Wahab
- Department of Chemistry and Biochemistry, University of Texas at Arlington, 76019, USA
| | - Houston D Cole
- Department of Chemistry and Biochemistry, University of Texas at Arlington, 76019, USA
| | - Nagham Alatrash
- Department of Chemistry and Biochemistry, University of Texas at Arlington, 76019, USA
| | - Elamparuthi Ramasamy
- Department of Chemistry and Biochemistry, University of Texas at Arlington, 76019, USA
| | | | - Sherri A McFarland
- Department of Chemistry and Biochemistry, University of Texas at Arlington, 76019, USA
| | - Daniel W Armstrong
- Department of Chemistry and Biochemistry, University of Texas at Arlington, 76019, USA.
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Dispas A, Sacré PY, Ziemons E, Hubert P. Emerging analytical techniques for pharmaceutical quality control: Where are we in 2022? J Pharm Biomed Anal 2022; 221:115071. [PMID: 36179505 DOI: 10.1016/j.jpba.2022.115071] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2022] [Revised: 09/05/2022] [Accepted: 09/20/2022] [Indexed: 12/19/2022]
Abstract
Quality control is a fundamental and critical activity in the pharmaceutical industry that guarantees the quality of medicines. QC analyses are currently performed using several well-known techniques, mainly liquid and gas chromatography. However, current trends are focused on the development of new techniques to reduce analysis time and cost, to improve the performances and decrease ecological footprint. In this context, analytical scientists developed and studied emerging technologies based on spectroscopy and chromatography. The present review aims to give an overview of the recent development of vibrational spectroscopy, supercritical fluid chromatography and multi-dimensional chromatography. Selected emerging techniques are discussed using SWOT analysis and published pharmaceutical QC applications are discussed.
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Affiliation(s)
- Amandine Dispas
- University of Liege (ULiege), CIRM, Laboratory of Pharmaceutical Analytical Chemistry, Liège, Belgium; University of Liege (ULiege), CIRM, Laboratory for the Analysis of Medicines, Liège, Belgium.
| | - Pierre-Yves Sacré
- University of Liege (ULiege), CIRM, Laboratory of Pharmaceutical Analytical Chemistry, Liège, Belgium
| | - Eric Ziemons
- University of Liege (ULiege), CIRM, Laboratory of Pharmaceutical Analytical Chemistry, Liège, Belgium
| | - Philippe Hubert
- University of Liege (ULiege), CIRM, Laboratory of Pharmaceutical Analytical Chemistry, Liège, Belgium
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Jambo H, Hubert P, Dispas A. Supercritical fluid chromatography for pharmaceutical quality control: Current challenges and perspectives. Trends Analyt Chem 2022. [DOI: 10.1016/j.trac.2021.116486] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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7
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Homerin G, Ghinet A, Nica AS, Chankvetadze B, Lipka E. Optimization of Detection of Native Amino Acids with Evaporative Light Scattering Detector in Chiral Supercritical Fluid Chromatography. Chromatographia 2021. [DOI: 10.1007/s10337-020-03999-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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8
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Bouchot P, Foulon C, Lecoeur M. Determination of the stoichiometry between a drug and its counter-ion by supercritical fluid chromatography using ultra-violet and evaporative light scattering detections: Application to ondansetron hydrochloride. Talanta 2020; 218:121166. [PMID: 32797919 DOI: 10.1016/j.talanta.2020.121166] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2020] [Revised: 05/13/2020] [Accepted: 05/15/2020] [Indexed: 12/22/2022]
Abstract
In this paper, a supercritical fluid chromatography method using ultra-violet and evaporative light scattering detections (SFC-UV/ELSD) has been developed and validated for the stoichiometry determination of an antiemetic drug with its counter-ion i.e. ondansetron hydrochloride. Seven stationary phases were first screened using a CO2-methanol-diethylamine mobile phase. Best conditions were determined using Derringer's desirability functions regarding chromatographic separation: selectivity, resolution, peak shape and runtime. The influence of co-solvent composition on resolution was evaluated. After optimization, best chromatographic results were obtained using 2-ethylpyridine stationary phase and a co-solvent composed of 0.2% diethylamine and 2% water in methanol. While ondansetron was quantified using UV detection (214 nm) and an external calibration curve, the determination of chloride was carried out using ELSD and an internal calibration curve. Then, the method was validated using the accuracy profile approach with a total error included in the ±10%. Finally, the proposed method was applied for the determination of the molar ratio between ondansetron and chloride. A value of 1.001 ± 0.003 demonstrated that the stoichiometry of this drug with its counter-ion was 1:1.
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Affiliation(s)
- Pauline Bouchot
- Univ Lille, CHU Lille, ULR 7365, GRITA, Groupe de Recherche sur Les Formes Injectables et Technologies Associées, F-59000, Lille, France
| | - Catherine Foulon
- Univ Lille, CHU Lille, ULR 7365, GRITA, Groupe de Recherche sur Les Formes Injectables et Technologies Associées, F-59000, Lille, France
| | - Marie Lecoeur
- Univ Lille, CHU Lille, ULR 7365, GRITA, Groupe de Recherche sur Les Formes Injectables et Technologies Associées, F-59000, Lille, France.
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Santos WMD, de Souza ML, Nóbrega FP, de Sousa ALMD, De França EJ, Rolim LA, Rolim Neto PJ. A Review of Analytical Methods for Calcium Salts and Cholecalciferol in Dietary Supplements. Crit Rev Anal Chem 2020; 52:697-711. [PMID: 32985223 DOI: 10.1080/10408347.2020.1823810] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
Dietary supplements composed by the combination of a calcium salt with cholecalciferol (vitamin D3) are widely used for improving bone health in conditions caused by the deficiency of these compounds in the body. Historically, these supplements have been linked to quality and safety issues. In the case of calcium salts, the presence of potentially toxic contaminants such as lead (Pb) has already been alerted by health authorities from different countries. Meanwhile, cholecalciferol is very unstable under inadequate manufacturing and storage conditions. The content of both compounds in commercial dietary supplements is often found to be in disagreement with the label claims, which can lead to a deficient or excessive nutrient intake by consumers. In this scenario, analyzing these compounds is still a difficult and time-consuming task, which usually requires specific pretreatment procedures and multiple analytical methods due to the inorganic nature of calcium and the organic nature of cholecalciferol. Therefore, this article reviews the analytical methods, described in official compendia and scientific literature, for the determination of calcium salts and cholecalciferol in dietary supplement formulations. We also approached the sample preparation procedures highly required due to the matrix complexity of these materials.
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Affiliation(s)
- Widson Michael Dos Santos
- Laboratório de Tecnologia dos Medicamentos (LTM), Universidade Federal de Pernambuco (UFPE), Recife, Brazil
| | - Myla Lôbo de Souza
- Laboratório de Tecnologia dos Medicamentos (LTM), Universidade Federal de Pernambuco (UFPE), Recife, Brazil
| | - Fernanda Pontes Nóbrega
- Laboratório de Tecnologia dos Medicamentos (LTM), Universidade Federal de Pernambuco (UFPE), Recife, Brazil
| | | | - Elvis Joacir De França
- Centro Regional de Ciências Nucleares do Nordeste (CRCN-NE), Comissão Nacional de Energia Nuclear (CNEN), Recife, Brazil
| | - Larissa Araújo Rolim
- Central de Análise de Fármacos, Medicamentos e Alimentos (CAFMA, Universidade Federal do Vale do São Francisco (UNIVASF), Petrolina, Brazil)
| | - Pedro José Rolim Neto
- Laboratório de Tecnologia dos Medicamentos (LTM), Universidade Federal de Pernambuco (UFPE), Recife, Brazil
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Raimbault A, Ma CMA, Ferri M, Bäurer S, Bonnet P, Bourg S, Lämmerhofer M, West C. Cinchona-based zwitterionic stationary phases: Exploring retention and enantioseparation mechanisms in supercritical fluid chromatography with a fragmentation approach. J Chromatogr A 2020; 1612:460689. [DOI: 10.1016/j.chroma.2019.460689] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2019] [Revised: 11/05/2019] [Accepted: 11/06/2019] [Indexed: 12/16/2022]
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Xu R, Chen X, Wang X, Yu L, Zhao W, Ba Y, Wu X. Development and validation of an ultra-high performance supercritical fluid chromatography-photodiode array detection-mass spectrometry method for the simultaneous determination of 12 compounds in Piper longum L. Food Chem 2019; 298:125067. [PMID: 31260989 DOI: 10.1016/j.foodchem.2019.125067] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2019] [Revised: 06/12/2019] [Accepted: 06/23/2019] [Indexed: 01/17/2023]
Abstract
An ultra-high performance supercritical fluid chromatography-photodiode array detection-mass spectrometry (UHPSFC-MS) method for quality control of Piper longum L. has been developed and optimized. Hexane/isopropanol (70/30, v/v) was determined as the final injection solvent and methanol as the organic modifier. A design-of-experimental (DoE) approach was used to optimize column temperature, back-pressure and the gradient slope simultaneously using Trefoil CEL1 column. The back-pressure, temperature, flow rate were set at 130 bar, 32.5 °C and 1.0 mL/min, respectively. Positive electrospray ionization was used in the single ion monitoring mode. The 12 analytes were analyzed within 8 min using the optimized conditions. The linearities of the standard calibrations were satisfactory with coefficients of determination (R2) > 0.995. The recovery measured varied from 96.34% to 105.00% with relative standard deviation (RSD) ≤ 4.68%. The method was sensitive, reliable and effective, and successfully applied to simultaneous determination of 12 compounds in 28 batches of P. longum.
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Affiliation(s)
- Rongrong Xu
- Beijing Key Lab of TCM Collateral Disease Theory Research, School of Traditional Chinese Medicine, Capital Medical University, 10 Youanmen, Xitoutiao, Beijing 100069, China
| | - Xiaoqing Chen
- Beijing Key Lab of TCM Collateral Disease Theory Research, School of Traditional Chinese Medicine, Capital Medical University, 10 Youanmen, Xitoutiao, Beijing 100069, China
| | - Xing Wang
- Beijing Key Lab of TCM Collateral Disease Theory Research, School of Traditional Chinese Medicine, Capital Medical University, 10 Youanmen, Xitoutiao, Beijing 100069, China
| | - Lan Yu
- Beijing Key Lab of TCM Collateral Disease Theory Research, School of Traditional Chinese Medicine, Capital Medical University, 10 Youanmen, Xitoutiao, Beijing 100069, China
| | - Wenwen Zhao
- Beijing Key Lab of TCM Collateral Disease Theory Research, School of Traditional Chinese Medicine, Capital Medical University, 10 Youanmen, Xitoutiao, Beijing 100069, China
| | - Yinying Ba
- Beijing Key Lab of TCM Collateral Disease Theory Research, School of Traditional Chinese Medicine, Capital Medical University, 10 Youanmen, Xitoutiao, Beijing 100069, China.
| | - Xia Wu
- Beijing Key Lab of TCM Collateral Disease Theory Research, School of Traditional Chinese Medicine, Capital Medical University, 10 Youanmen, Xitoutiao, Beijing 100069, China.
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12
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Deng H, Tang G, Fan Z, Liu S, Li Z, Wang Y, Bian Z, Shen W, Tang S, Yang F. Use of autoclave extraction-supercritical fluid chromatography/tandem mass spectrometry to analyze 4-(methylintrosamino)-1-(3-pyridyl)-1-butanone and N'-nitrosonornicotine in tobacco. J Chromatogr A 2019; 1595:207-214. [PMID: 30827697 DOI: 10.1016/j.chroma.2019.02.053] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2018] [Revised: 02/19/2019] [Accepted: 02/22/2019] [Indexed: 01/21/2023]
Abstract
4-(methylintrosamino)-1-(3-pyridyl)-1-butanone (NNK) and N'-nitrosonornicotine (NNN) are the most prevalent and toxic tobacco specific nitrosamines (TSNAs). Due to their carcinogenicity, knowledge of the composition of NNK and NNN in tobacco is necessary. Herein, a sensitive and rapid method, which employs autoclave extraction-supercritical fluid chromatography/tandem mass spectrometry (SFC-MS/MS), has been developed for the analysis of NNK and NNN in tobacco. Both water-soluble and matrix-bound NNK and NNN were extracted with 100 mM ammonium acetate in an autoclave (130 °C, 4 h), and the aqueous extract was subjected to solvent replacement prior to SFC-MS/MS analysis. NNK and NNN were effectively separated within 5 min by using supercritical CO2 as the main mobile phase coupled with a co-solvent of methanol. Excellent linearity was obtained with coefficients of determination (R2) greater than 0.9997 in the range of 1-160 ng/mL and 5-800 ng/mL for NNK and NNN, respectively. The recoveries were in the range of 92.5-110.0% at different spiked levels of real samples. 12 tobacco samples which include 3 typical tobacco varieties of burley, flue-cured, and oriental tobaccos had been analyzed, and the fraction of matrix-bound NNK was determined as well. In addition, a comparison between the proposed SFC-MS/MS method and a validated liquid chromatography tandem mass spectrometry (LC-MS/MS) internal standard method was conducted. Both techniques exhibit comparable analysis results, but peak splitting of NNN was observed by LC-MSMS due to the existence of E/Z isomers, while SFC-MS/MS offers great improvement through elution condition optimization, demonstrating the applicability of SFC-MS/MS as an alternative tool for NNK and NNN analysis.
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Affiliation(s)
- Huimin Deng
- China National Tobacco Quality Supervision and Test Center, No.2 Fengyang Street, High and New Technology Industries Development Zone, Zhengzhou, 450001, China
| | - Gangling Tang
- China National Tobacco Quality Supervision and Test Center, No.2 Fengyang Street, High and New Technology Industries Development Zone, Zhengzhou, 450001, China
| | - Ziyan Fan
- China National Tobacco Quality Supervision and Test Center, No.2 Fengyang Street, High and New Technology Industries Development Zone, Zhengzhou, 450001, China
| | - Shanshan Liu
- China National Tobacco Quality Supervision and Test Center, No.2 Fengyang Street, High and New Technology Industries Development Zone, Zhengzhou, 450001, China
| | - Zhonghao Li
- China National Tobacco Quality Supervision and Test Center, No.2 Fengyang Street, High and New Technology Industries Development Zone, Zhengzhou, 450001, China
| | - Ying Wang
- China National Tobacco Quality Supervision and Test Center, No.2 Fengyang Street, High and New Technology Industries Development Zone, Zhengzhou, 450001, China
| | - Zhaoyang Bian
- China National Tobacco Quality Supervision and Test Center, No.2 Fengyang Street, High and New Technology Industries Development Zone, Zhengzhou, 450001, China
| | - Wei Shen
- School of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang, 212003, Jiangsu Province, China
| | - Sheng Tang
- School of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang, 212003, Jiangsu Province, China.
| | - Fei Yang
- China National Tobacco Quality Supervision and Test Center, No.2 Fengyang Street, High and New Technology Industries Development Zone, Zhengzhou, 450001, China.
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Liu L, Xie MR, Chen YZ, Wu ZY. Simultaneous electrokinetic stacking and separation of anionic and cationic species on a paper fluidic channel. LAB ON A CHIP 2019; 19:845-850. [PMID: 30706062 DOI: 10.1039/c8lc01320a] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
On-line enrichment is effective for improving the sensitivity of paper-based analytical devices (PADs). Electrokinetic stacking of ionic species - anionic or cationic species, respectively, on a paper-based fluidic channel has been well demonstrated in the literature. In this work, we further demonstrated that both anionic and cationic species can be electrokinetically stacked and separated simultaneously on the same paper fluidic channel. The feasibility of the proposed method was visually demonstrated by using a colored cationic probe of Rhodamine 6G and an anionic probe of Brilliant Blue. With the introduction of a background electrolyte (BGE) consisting of weak acid and weak base salt, two electric field gradients can be developed on the same paper fluidic channel when a DC voltage was applied. Both of the anionic and cationic species from the reservoirs can be simultaneously stacked as separate bands on the two field gradients, respectively. Under optimized conditions, two orders of magnitude enrichment factors can be achieved for the anionic and cationic probes as characterized by colorimetric analysis by smartphone imaging. The applicability of this method was further demonstrated by stacking and separation of copper ions/nitrite and even amphoteric ions-proteins of phycocyanin (blue, pI 4.4)/cytochrome C (brown, pI 10.2). Potential applications can be found not only for a PAD based point of care test (POCT), but also for sample pretreatment in protein analysis considering the friendliness of the BGE to the mass spectrometer.
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Affiliation(s)
- Lei Liu
- Research Center for Analytical Sciences, College of Sciences, Northeastern University, Shenyang 110819, P. R. China.
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15
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A simple colorimetric chemosensor with highly performance for detection of cyanide and copper ions and its practical application in real samples. J Photochem Photobiol A Chem 2018. [DOI: 10.1016/j.jphotochem.2018.08.015] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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16
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Current trends in supercritical fluid chromatography. Anal Bioanal Chem 2018; 410:6441-6457. [DOI: 10.1007/s00216-018-1267-4] [Citation(s) in RCA: 90] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2018] [Revised: 06/18/2018] [Accepted: 07/12/2018] [Indexed: 12/16/2022]
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