1
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Salehi R, J SJS, Burk RJ, Berthod A, Gündüz MG, Armstrong DW. Chiral superficially porous stationary phases for enantiomeric separation of condensed 1,4-dihydropyridine derivatives. J Pharm Biomed Anal 2024; 251:116420. [PMID: 39208648 DOI: 10.1016/j.jpba.2024.116420] [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: 07/17/2024] [Revised: 08/05/2024] [Accepted: 08/13/2024] [Indexed: 09/04/2024]
Abstract
1,4-dihydropyridine (DHP) scaffold occupies a prominent position among all heterocyclic compounds owing to its versatile pharmacological properties, particularly its well-known calcium channel blocking activity. In the quest of developing new calcium channel blockers, fifty seven 5-oxo-hexahydroquinoline (HHQ) derivatives carrying DHP framework in a condensed ring system were recently synthesized as racemic mixtures. Due to their potential as drug candidates, enantiomers arising from the asymmetric center at the C-4 position of the HHQ ring were separated. Four modern columns packed with 2.7 µm superficially porous particles bonded with a chiral selector were used. The chiral selectors were three macrocyclic glycopeptide selectors: vancomycin, teicoplanin, and a macrocyclic derivative called nico. The fourth bonded selector was the dinitrobenzamido-tetrahydrophenanthrenyl derivative called Whelko. The four chromatographic modes were assayed with the mobile phase compositions: reversed phase with acetonitrile/buffer 30/70 %v/v, normal phase with hexane/ethanol 80/20 %v/v, and subcritical fluid chromatography with CO2/methanol 80/20 %v/v at 25 °C. The WhelkoShell column was the most effective in separating this set of 57 compounds. Several enantioresolution factors passed 20 with enantioselectivity ratios higher than 4. Molecular modeling showed that the compounds had a T-shape that fitted well the molecular structure of the WhelkoShell selector in the normal or subcritical modes. Additionally, seven compounds had a second chiral center. The NicoShell column was able to separate all four stereoisomers of these compounds in the reversed phase mode. The preparative production of pure enantiomers of these compounds would be straightforward using the WhelkoShell column in the subcritical mode.
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Affiliation(s)
- Reza Salehi
- Department of Chemistry and Biochemistry, University of Texas at Arlington, TX 76019, USA
| | | | - Ryan Jacob Burk
- Department of Chemistry and Biochemistry, University of Texas at Arlington, TX 76019, USA
| | - Alain Berthod
- Institute of Analytical Sciences, University of Lyon 1, CNRS, Villeurbanne 69100, France
| | - Miyase Gözde Gündüz
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy, Hacettepe University, Sihhiye, Ankara 06100, Turkey
| | - Daniel W Armstrong
- Department of Chemistry and Biochemistry, University of Texas at Arlington, TX 76019, USA; AZYP, LLC, Arlington, TX 76019, USA.
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2
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Hemida M, Barrientos RC, Singh AN, Losacco GL, Wang H, Guillarme D, Larson E, Xu W, Appiah-Amponsah E, Regalado EL. Automated multicolumn screening workflow in ultra-high pressure hydrophilic interaction chromatography for streamlined method development of polar analytes. J Chromatogr A 2024; 1733:465266. [PMID: 39163703 DOI: 10.1016/j.chroma.2024.465266] [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: 07/16/2024] [Revised: 08/12/2024] [Accepted: 08/13/2024] [Indexed: 08/22/2024]
Abstract
The pharmaceutical industry is rapidly advancing toward new drug modalities, necessitating the development of advanced analytical strategies for effective, meaningful, and reliable assays. Hydrophilic Interaction Chromatography (HILIC) is a powerful technique for the analysis of polar analytes. Despite being a well-established technique, HILIC method development can be laborious owing to the multiple factors that affect the separation mechanism, such as the selection of stationary phase chemistry, mobile phase eluents, and optimization of column equilibration time. Herein, we introduce a new automated multicolumn and multi-eluent screening workflow that streamlines the development of new HILIC assays, circumventing the existing tedious 'hit-or-miss' approach. A total of 12 complementary columns packed with sub-2 µm fully porous and 2.7 µm superficially porous particles operated on readily available ultra-high pressure liquid chromatography (UHPLC) instrumentation across a diverse set of commercially available polar stationary phases were investigated. Different mobile phases with pH ranging from pH 3 to 9 were evaluated using different organic modifiers. The gradient and column re-equilibration were judiciously set to ensure a reliable assay screening framework that indicates promising conditions for subsequent method optimization to achieve resolution of challenging mixtures. This UHPLC screening system is coupled with a diode array and charged aerosol detectors (DAD, CAD and mass spectrometry) to ensure versatile detection for a variety of compounds. This fast-screening platform lays the foundation for a convenient generic workflow, accelerating the pace of HILIC method development and transfer across both academic and industrial sectors.
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Affiliation(s)
- Mohamed Hemida
- Analytical Research and Development, MRL, Merck & Co., Inc., 126 E. Lincoln Avenue, Rahway, NJ 07065, United States
| | - Rodell C Barrientos
- Analytical Research and Development, MRL, Merck & Co., Inc., 126 E. Lincoln Avenue, Rahway, NJ 07065, United States.
| | - Andrew N Singh
- Analytical Research and Development, MRL, Merck & Co., Inc., 126 E. Lincoln Avenue, Rahway, NJ 07065, United States
| | - Gioacchino Luca Losacco
- Analytical Research and Development, MRL, Merck & Co., Inc., 126 E. Lincoln Avenue, Rahway, NJ 07065, United States.
| | - Heather Wang
- Analytical Research and Development, MRL, Merck & Co., Inc., 126 E. Lincoln Avenue, Rahway, NJ 07065, United States
| | - Davy Guillarme
- Institute of Pharmaceutical Sciences of Western Switzerland (ISPSO), University of Geneva, CMU - Rue Michel Servet 1, 1211 Geneva, Switzerland; School of Pharmaceutical Sciences, University of Geneva, CMU - Rue Michel Servet 1, 1211 Geneva, Switzerland
| | - Eli Larson
- Analytical Research and Development, MRL, Merck & Co., Inc., 126 E. Lincoln Avenue, Rahway, NJ 07065, United States
| | - Wei Xu
- Analytical Research and Development, MRL, Merck & Co., Inc., 126 E. Lincoln Avenue, Rahway, NJ 07065, United States
| | - Emmanuel Appiah-Amponsah
- Analytical Research and Development, MRL, Merck & Co., Inc., 126 E. Lincoln Avenue, Rahway, NJ 07065, United States
| | - Erik L Regalado
- Analytical Research and Development, MRL, Merck & Co., Inc., 126 E. Lincoln Avenue, Rahway, NJ 07065, United States.
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3
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Rahmani T, Lynen F. Exploring the Effects of Optically Active Solvents in Chiral Chromatography on Polysaccharide-Based Columns. Anal Chem 2024; 96:14720-14726. [PMID: 39223745 DOI: 10.1021/acs.analchem.3c05040] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/04/2024]
Abstract
Exploring the effectiveness of optically active solvents as mobile-phase modifiers in chiral liquid chromatography (LC) can offer an additional new tool to tune the chiral selectivity. Hence, the potential of l-ethyl lactate (LEL), a biobased solvent of this nature, was explored for its distinctive interactions with both the mobile phase and analytes, as anticipated from its chiral nature. The findings reveal that LEL provides distinct selectivity compared to commonly used modifiers in chiral LC. Reversed-phase LC (RPLC)-type chiral separations were therefore compared under various conditions whereby LEL was partially or completely replacing common achiral solvents such as acetonitrile (ACN) and methanol (MeOH). An increase in chiral resolution was obtained in 8 of 16 test compounds. For 5 of them a decrease was obtained, and 3 test solutes did not offer satisfactory results under any of the tested conditions on the polysaccharide columns. When LEL was combined with methanol instead of ACN, worse results were obtained, presumably due to its protic nature. Moreover, LEL demonstrates excellent compatibility with salt additives and is fully miscible with aqueous phases. Interestingly, a steeper increase in chiral resolution is observed for LEL, as compared to ACN at lower temperatures. While LEL is somewhat hindered by its higher UV absorbance, it paves the way toward more simplified chiral screening platforms, whereby chiral solutions can be found for fewer columns and greener solvents such as LEL are incorporated. Finally, to elucidate the impact of chiral interactions between the solvent and analytes, the influence of d-ethyl lactate (DEL) was compared with that of LEL. The results revealed different interactions between the stereoisomers of ethyl lactate (EL) and chiral analytes, demonstrating an influence of optically active solvents on enantioseparations.
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Affiliation(s)
- Turaj Rahmani
- Separation Science Group, Department of Organic and Macromolecular Chemistry, Ghent University, Krijgslaan 281-S4, B-9000 Ghent, Belgium
| | - Frédéric Lynen
- Separation Science Group, Department of Organic and Macromolecular Chemistry, Ghent University, Krijgslaan 281-S4, B-9000 Ghent, Belgium
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4
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Yang K, Wang R, Lu J, Wang J, Liao X, Wang C. A covalent organic framework nanosheet-nanochannel composite with signal amplification strategy for electrochemical enantioselective recognition. Talanta 2024; 277:126331. [PMID: 38823324 DOI: 10.1016/j.talanta.2024.126331] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2024] [Revised: 05/18/2024] [Accepted: 05/27/2024] [Indexed: 06/03/2024]
Abstract
Recognition and separation of chiral isomers are of great importance in both industrial and biological applications. However, owing to identical molecular formulas and chemical properties of enantiomers, signal transduction and amplification are still two major challenges in chiral sensing. In this study, we developed an enantioselective device by integrating chiral covalent organic framework nanosheets (CONs) with nanochannels for sensitive identification and quantification of enantiomers. Using 3,4-dihydroxyphenylalanine (DOPA) as the model analyte, the as-prepared chiral nanofluidic device exhibits a remarkable chiral recognition ability to l-DOPA than d-DOPA. More importantly, due to the chelation of DOPA with Fe3+ ions, it can efficiently block the ion transport through channel and shield the channel surface charge, which will amplify the difference in the electrochemical response of l-DOPA and d-DOPA. Therefore, a sensitive chiral recognition can be achieved using the present nanofluidic device coupled using electrochemical amplification strategy. Notably, using this method, an ultra-low concentration of l-DOPA (as low as 0.21 pM) can be facilely and successfully detected with a linear range of 1 pM-10 μM. This study provides a reliable and sensitive approach for achieving highly selective detection of chiral molecules.
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Affiliation(s)
- Kun Yang
- Jiangsu Key Laboratory of Biofunctional Materials, Jiangsu Collaborative Innovation Center of Biomedical Functional Materials, Jiangsu Key Laboratory of New Power Batteries, College of Chemistry and Materials Science, Nanjing Normal University, Nanjing, 210023, China
| | - Ruyi Wang
- Jiangsu Key Laboratory of Biofunctional Materials, Jiangsu Collaborative Innovation Center of Biomedical Functional Materials, Jiangsu Key Laboratory of New Power Batteries, College of Chemistry and Materials Science, Nanjing Normal University, Nanjing, 210023, China
| | - Junjian Lu
- Jiangsu Key Laboratory of Biofunctional Materials, Jiangsu Collaborative Innovation Center of Biomedical Functional Materials, Jiangsu Key Laboratory of New Power Batteries, College of Chemistry and Materials Science, Nanjing Normal University, Nanjing, 210023, China; Honors college, Nanjing Normal University, Nanjing, 210023, China
| | - Jin Wang
- Jiangsu Key Laboratory of Biofunctional Materials, Jiangsu Collaborative Innovation Center of Biomedical Functional Materials, Jiangsu Key Laboratory of New Power Batteries, College of Chemistry and Materials Science, Nanjing Normal University, Nanjing, 210023, China
| | - Xuewei Liao
- Jiangsu Key Laboratory of Biofunctional Materials, Jiangsu Collaborative Innovation Center of Biomedical Functional Materials, Jiangsu Key Laboratory of New Power Batteries, College of Chemistry and Materials Science, Nanjing Normal University, Nanjing, 210023, China; Analytical & Testing Center, Nanjing Normal University, Nanjing, 210023, China.
| | - Chen Wang
- Jiangsu Key Laboratory of Biofunctional Materials, Jiangsu Collaborative Innovation Center of Biomedical Functional Materials, Jiangsu Key Laboratory of New Power Batteries, College of Chemistry and Materials Science, Nanjing Normal University, Nanjing, 210023, China.
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5
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Sagrado S, Pardo-Cortina C, Escuder-Gilabert L, Medina-Hernández MJ, Martín-Biosca Y. Intelligent Recommendation Systems Powered by Consensus Neural Networks: The Ultimate Solution for Finding Suitable Chiral Chromatographic Systems? Anal Chem 2024; 96:12205-12212. [PMID: 38982948 PMCID: PMC11270524 DOI: 10.1021/acs.analchem.4c02656] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2024] [Revised: 07/03/2024] [Accepted: 07/04/2024] [Indexed: 07/11/2024]
Abstract
The selection of suitable combinations of chiral stationary phases (CSPs) and mobile phases (MPs) for the enantioresolution of chiral compounds is a complex issue that often requires considerable experimental effort and can lead to significant waste. Linking the structure of a chiral compound to a CSP/MP system suitable for its enantioseparation can be an effective solution to this problem. In this study, we evaluate algorithmic tools for this purpose. Our proposed consensus model, which uses multiple optimized artificial neural networks (ANNs), shows potential as an intelligent recommendation system (IRS) for ranking chromatographic systems suitable for the enantioresolution of chiral compounds with different molecular structures. To evaluate the IRS potential in a proof-of-concept stage, 56 structural descriptors for 56 structurally unrelated chiral compounds across 14 different families are considered. Chromatographic systems under study comprise 7 cellulose and amylose derivative CSPs and acetonitrile or methanol aqueous MPs (14 chromatographic systems in all). The ANNs are optimized using a fit-for-purpose version of the chaotic neural network algorithm with competitive learning (CCLNNA), a novel approach not previously applied in the chemical domain. CCLNNA is adapted to define the inner ANN complexity and perform feature selection of the structural descriptors. A customized target function evaluates the correctness of recommending the appropriate CSP/MP system. The ANN-consensus model exhibits no advisory failures and requires only an experimental attempt to verify the IRS recommendation for complete enantioresolution. This outstanding performance highlights its potential to effectively resolve this problem.
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Affiliation(s)
- Salvador Sagrado
- Departamento
de Química Analítica, Universitat
de València, Burjassot, E- 46100 Valencia, Spain
- Instituto
Interuniversitario de Investigación de Reconocimiento Molecular
y Desarrollo Tecnológico (IDM), Universitat Politècnica
de València, Universitat de València, E-46100 Valencia, Spain
| | - Carlos Pardo-Cortina
- Departamento
de Química Analítica, Universitat
de València, Burjassot, E- 46100 Valencia, Spain
| | - Laura Escuder-Gilabert
- Departamento
de Química Analítica, Universitat
de València, Burjassot, E- 46100 Valencia, Spain
| | | | - Yolanda Martín-Biosca
- Departamento
de Química Analítica, Universitat
de València, Burjassot, E- 46100 Valencia, Spain
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6
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Woiwode U, Sievers-Engler A, Lämmerhofer M. Cross-linked polysiloxane-coated stable bond O-9-(2,6-diisopropylphenylcarbamoyl)quinine and quinidine chiral stationary phases as well as application in enantioselective cryo-HPLC. Electrophoresis 2024; 45:989-999. [PMID: 37916661 DOI: 10.1002/elps.202300182] [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: 08/18/2023] [Revised: 10/10/2023] [Accepted: 10/13/2023] [Indexed: 11/03/2023]
Abstract
In this work, brush-type chiral stationary phases (CSPs) with O-9-(2,6-diisopropylphenylcarbamoyl)-modified quinidine (DIPPCQD-brush/-SH) and O-9-(2,6-diisopropylphenylcarbamoyl)-modified quinine (DIPPCQN-brush/-SH) were prepared as benchmarks for comparison with new corresponding polymeric CSPs with more stable bonding chemistry. These polymeric CSPs were prepared by coating a thin poly(3-mercaptopropyl)-methylsiloxane film together with the chiral selector onto vinyl-modified silica. In a second step, immobilization of the quinine/quinidine derivatives as well as cross-linking of the polysiloxane film to the vinyl-silica is achieved by a double thiol-ene click reaction. The polymeric CSPs exhibited similar enantioselectivity as the corresponding brush phases, but showed lower chromatographic efficiencies. Chiral acidic substances were separated into enantiomers (e.g., N-protected amino acids, herbicides like dichlorprop) in accordance with an enantioselective anion-exchange process. Oxidation of residual thiol groups of the polymer DIPPCQN-CSP introduced sulfonic acid co-ligands on the silica surface, which resulted in greatly reduced retention times. Acting as immobilized counterions, they allowed to reduce the concentration of counterions in the mobile phase, which is favorable for liquid chromatography (LC)-electrospray ionization-mass spectrometry application. Ibuprofen showed a single peak under ambient column temperature. However, application of cryogenic cooling of the column enabled to achieve baseline separation at -20°C column temperature. It can be explained by an enthalpically dominated separation, which leads to an increase in separation factors when the temperature is reduced. While it is quite uncommon to work at subzero degree column temperature, this work illustrates the potential to exploit such temperature regime for optimization of LC enantiomer separations.
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Affiliation(s)
- Ulrich Woiwode
- Institute of Pharmaceutical Sciences, Pharmaceutical (Bio-)Analysis, University of Tübingen, Tübingen, Germany
| | - Adrian Sievers-Engler
- Institute of Pharmaceutical Sciences, Pharmaceutical (Bio-)Analysis, University of Tübingen, Tübingen, Germany
| | - Michael Lämmerhofer
- Institute of Pharmaceutical Sciences, Pharmaceutical (Bio-)Analysis, University of Tübingen, Tübingen, Germany
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7
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Barrientos RC, Singh AN, Ukaegbu O, Hemida M, Wang H, Haidar Ahmad I, Hu H, Dunn ZD, Appiah-Amponsah E, Regalado EL. Two-Dimensional SEC-SEC-UV-MALS-dRI Workflow for Streamlined Analysis and Characterization of Biopharmaceuticals. Anal Chem 2024; 96:4960-4968. [PMID: 38436624 DOI: 10.1021/acs.analchem.3c05969] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/05/2024]
Abstract
The emergence of complex biological modalities in the biopharmaceutical industry entails a significant expansion of the current analytical toolbox to address the need to deploy meaningful and reliable assays at an unprecedented pace. Size exclusion chromatography (SEC) is an industry standard technique for protein separation and analysis. Some constraints of traditional SEC stem from its restricted ability to resolve complex mixtures and notoriously long run times while also requiring multiple offline separation conditions on different pore size columns to cover a wider molecular size distribution. Two-dimensional liquid chromatography (2D-LC) is becoming an important tool not only to increase peak capacity but also to tune selectivity in a single online method. Herein, an online 2D-LC framework in which both dimensions utilize SEC columns with different pore sizes is introduced with a goal to increase throughput for biomolecule separation and characterization. In addition to improving the separation of closely related species, this online 2D SEC-SEC approach also facilitated the rapid analysis of protein-based mixtures of a wide molecular size range in a single online experimental run bypassing time-consuming deployment of different offline SEC methods. By coupling the second dimension with multiangle light scattering (MALS) and differential refractive index (dRI) detectors, absolute molecular weights of the separated species were obtained without the use of calibration curves. As illustrated in this report for protein mixtures and vaccine processes, this workflow can be used in scenarios where rapid development and deployment of SEC assays are warranted, enabling bioprocess monitoring, purity assessment, and characterization.
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Affiliation(s)
- Rodell C Barrientos
- Analytical Research and Development, MRL, Merck & Co., Inc., 126 E. Lincoln Avenue, Rahway, New Jersey 07065, United States
| | - Andrew N Singh
- Analytical Research and Development, MRL, Merck & Co., Inc., 126 E. Lincoln Avenue, Rahway, New Jersey 07065, United States
| | - Ophelia Ukaegbu
- Analytical Research and Development, MRL, Merck & Co., Inc., 126 E. Lincoln Avenue, Rahway, New Jersey 07065, United States
| | - Mohamed Hemida
- Analytical Research and Development, MRL, Merck & Co., Inc., 126 E. Lincoln Avenue, Rahway, New Jersey 07065, United States
| | - Heather Wang
- Analytical Research and Development, MRL, Merck & Co., Inc., 126 E. Lincoln Avenue, Rahway, New Jersey 07065, United States
| | - Imad Haidar Ahmad
- Analytical Research and Development, MRL, Merck & Co., Inc., 126 E. Lincoln Avenue, Rahway, New Jersey 07065, United States
| | - Hang Hu
- Analytical Research and Development, MRL, Merck & Co., Inc., 126 E. Lincoln Avenue, Rahway, New Jersey 07065, United States
| | - Zachary D Dunn
- Analytical Research and Development, MRL, Merck & Co., Inc., 126 E. Lincoln Avenue, Rahway, New Jersey 07065, United States
| | - Emmanuel Appiah-Amponsah
- Analytical Research and Development, MRL, Merck & Co., Inc., 126 E. Lincoln Avenue, Rahway, New Jersey 07065, United States
| | - Erik L Regalado
- Analytical Research and Development, MRL, Merck & Co., Inc., 126 E. Lincoln Avenue, Rahway, New Jersey 07065, United States
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8
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Hemida M, Haidar Ahmad IA, Barrientos RC, Regalado EL. Computer-assisted multifactorial method development for the streamlined separation and analysis of multicomponent mixtures in (Bio)pharmaceutical settings. Anal Chim Acta 2024; 1293:342178. [PMID: 38331548 DOI: 10.1016/j.aca.2023.342178] [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: 10/29/2023] [Revised: 12/13/2023] [Accepted: 12/23/2023] [Indexed: 02/10/2024]
Abstract
The (bio)pharmaceutical industry is rapidly moving towards complex drug modalities that require a commensurate level of analytical enabling technologies that can be deployed at a fast pace. Unsystematic method development and unnecessary manual intervention remain a major barrier towards a more efficient deployment of meaningful analytical assay across emerging modalities. Digitalization and automation are key to streamline method development and enable rapid assay deployment. This review discusses the use of computer-assisted multifactorial chromatographic method development strategies for fast-paced downstream characterization and purification of biopharmaceuticals. Various chromatographic techniques such as reversed-phase liquid chromatography (RPLC), hydrophilic interaction liquid chromatography (HILIC), ion exchange chromatography (IEX), hydrophobic interaction chromatography (HIC), and supercritical fluid chromatography (SFC) are addressed and critically reviewed. The most significant parameters for retention mechanism modelling, as well as mapping the separation landscape for optimal chromatographic selectivity and resolution are also discussed. Furthermore, several computer-assisted approaches for optimization and development of chromatographic methods of therapeutics, including linear, nonlinear, and multifactorial modelling are outlined. Finally, the potential of the chromatographic modelling and computer-assisted optimization strategies are also illustrated, highlighting substantial productivity improvements, and cost savings while accelerating method development, deployment and transfer processes for therapeutic analysis in industrial settings.
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Affiliation(s)
- Mohamed Hemida
- Analytical Research and Development, MRL, Merck & Co., Inc., 126 E. Lincoln Avenue, Rahway, NJ, 07065, United States.
| | - Imad A Haidar Ahmad
- Analytical Research and Development, MRL, Merck & Co., Inc., 126 E. Lincoln Avenue, Rahway, NJ, 07065, United States.
| | - Rodell C Barrientos
- Analytical Research and Development, MRL, Merck & Co., Inc., 126 E. Lincoln Avenue, Rahway, NJ, 07065, United States
| | - Erik L Regalado
- Analytical Research and Development, MRL, Merck & Co., Inc., 126 E. Lincoln Avenue, Rahway, NJ, 07065, United States
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9
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Tan L, Cai W, Wang F, Li J, Wu D, Kong Y. Postsynthetic Modification Strategy for Constructing Electrochemiluminescence-Active Chiral Covalent Organic Frameworks Performing Efficient Enantioselective Sensing. Anal Chem 2024; 96:3942-3950. [PMID: 38394220 DOI: 10.1021/acs.analchem.3c05887] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/25/2024]
Abstract
Electrochemiluminescence (ECL), integrating the characteristics of electrochemistry and fluorescence, has the advantages of high sensitivity and low background. However, only a few studies have been reported for enantioselective sensing based on the ECL-active platform because of the huge challenges in constructing tunable chiral ECL luminophores. Here, we developed a facile strategy to design and prepare ECL-active chiral covalent organic frameworks (COFs) Ph-triPy+-(R)-Ru(II) for enantioselective sensing. In such an artificial structure, the ionic skeleton of COFs was beneficial to the electron transfer on the working electrode surface and the chiral Ru-ligand was used as the chiral ECL-active luminophore. It was found that Ph-triPy+-(R)-Ru(II) coupled with sodium persulfate (Na2S2O8) as the coreactant exhibited obvious ECL signals. More importantly, a clear difference toward l- and d-enantiomers was observed in the response of the ECL intensity, resulting in a uniform recognition law. That is, for amino alcohols, d-enantiomers (1 mM) measured by Ph-triPy+-(R)-Ru(II) showed a higher ECL intensity compared with l-enantiomers. Differently, amino acids (1 mM) gave an inverse recognition phenomenon. The ECL intensity ratios between l- and d-enantiomers (1 mM) are in the range of 1.25-1.94 for serine, aspartic acid, glutamic acid, valine, leucine, leucinol, and valinol. What is more interesting is that the ECL intensity was closely related to the concentration of l-amino alcohols and d-amino acids, whereas their inverse configurations remained unchanged. In a word, the present concept demonstrates a feasible direction toward chiral ECL-active COFs and their potential for efficient enantioselective sensing.
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Affiliation(s)
- Lilan Tan
- Jiangsu Key Laboratory of Advanced Materials and Technology, School of Petrochemical Engineering, Changzhou University, Changzhou 213164, China
| | - Wenrong Cai
- Jiangsu Key Laboratory of Advanced Materials and Technology, School of Petrochemical Engineering, Changzhou University, Changzhou 213164, China
| | - Fangqin Wang
- Jiangsu Key Laboratory of Advanced Materials and Technology, School of Petrochemical Engineering, Changzhou University, Changzhou 213164, China
| | - Junyao Li
- Jiangsu Key Laboratory of Advanced Materials and Technology, School of Petrochemical Engineering, Changzhou University, Changzhou 213164, China
| | - Datong Wu
- Jiangsu Key Laboratory of Advanced Materials and Technology, School of Petrochemical Engineering, Changzhou University, Changzhou 213164, China
| | - Yong Kong
- Jiangsu Key Laboratory of Advanced Materials and Technology, School of Petrochemical Engineering, Changzhou University, Changzhou 213164, China
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10
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Jaag S, Valadbeigi Y, Causon T, Gross H, Lämmerhofer M. Three-Minute Enantioselective Amino Acid Analysis by Ultra-High-Performance Liquid Chromatography Drift Tube Ion Mobility-Mass Spectrometry Using a Chiral Core-Shell Tandem Column Approach. Anal Chem 2024; 96:2666-2675. [PMID: 38297457 PMCID: PMC10867800 DOI: 10.1021/acs.analchem.3c05426] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2023] [Revised: 01/17/2024] [Accepted: 01/19/2024] [Indexed: 02/02/2024]
Abstract
Fast liquid chromatography (LC) amino acid enantiomer separation of 6-aminoquinolyl-N-hydroxysuccinimidyl carbamate (AQC) derivatives using a chiral core-shell particle tandem column with weak anion exchange and zwitterionic-type quinine carbamate selectors in less than 3 min was achieved. Enantiomers of all AQC-derivatized proteinogenic amino acids and some isomeric ones (24 in total plus achiral glycine) were baseline separated (Rs > 1.5 except for glutamic acid with Rs = 1.3), while peaks of distinct amino acids and structural isomers (constitutional isomers and diastereomers of leucine and threonine) of the same configuration overlapped to various degrees. For this reason, drift tube ion mobility-mass spectrometry was added (i.e., LC-IM-MS) as an additional selectivity filter without extending run time. The IM separation dimension in combination with high-resolution demultiplexing enabled confirmation of threonine isomers (threonine, allo-threonine, homoserine), while leucine, isoleucine, and allo-isoleucine have almost identical collisional cross-section (DTCCSN2) values and added no selectivity to the partial LC separation. Density functional theory (DFT) calculations show that IM separation of threonine isomers was possible due to conformational stabilization by hydrogen bond formation between the hydroxyl side chain and the urea group. Generally, the CCSN2 of protonated ions increased uniformly with addition of the AQC label, while outliers could be explained by consideration of intramolecular interactions and additional structural analysis. Preliminary validation of the enantioselective LC-IM-MS method for quantitative analysis showed compliance of accuracy and precision with common limits in bioanalytical methods, and applicability to a natural lipopeptide and a therapeutic synthetic peptide could be demonstrated.
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Affiliation(s)
- Simon
Jonas Jaag
- Pharmaceutical
(Bio-)Analysis, Institute of Pharmaceutical Sciences, University of Tuebingen, Auf der Morgenstelle 8, 72076 Tuebingen, Germany
| | - Younes Valadbeigi
- Department
of Chemistry, Faculty of Science, Imam Khomeini
International University, Nowrouzian, 3414896818 Qazvin, Iran
| | - Tim Causon
- University
of Natural Resources and Life Sciences, Vienna Department of Chemistry, Institute of Analytical Chemistry, Muthgasse 18, 1190 Vienna, Austria
| | - Harald Gross
- Pharmaceutical
Biology, Institute of Pharmaceutical Sciences, University of Tuebingen, Auf der Morgenstelle 8, 72076 Tuebingen, Germany
| | - Michael Lämmerhofer
- Pharmaceutical
(Bio-)Analysis, Institute of Pharmaceutical Sciences, University of Tuebingen, Auf der Morgenstelle 8, 72076 Tuebingen, Germany
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11
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Manheim J, Singh AN, Aggarwal P, Aldine FN, Haidar Ahmad IA. An improved workflow for the development of MS-compatible liquid chromatography assay purity and purification methods by using automated LC Screening instrumentation and in silico modeling. Anal Bioanal Chem 2024; 416:1269-1279. [PMID: 38225399 DOI: 10.1007/s00216-023-05118-3] [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: 11/08/2023] [Revised: 12/18/2023] [Accepted: 12/20/2023] [Indexed: 01/17/2024]
Abstract
The development of liquid chromatography UV and mass spectrometry (LC-UV-MS) assays in pharmaceutical analysis is pivotal to improve quality control by providing critical information about drug purity, stability, and presence and identity of byproducts and impurities. Analytical method development of these assays is time-consuming, which often causes it to become a bottle neck in drug development and poses a challenge for process chemists to quickly improve the chemistry. In this study, a systematic and efficient workflow was designed to develop purity assay and purification methods for a wide range of compounds including peptides, proteins, and small molecules with MS-compatible mobile phases (MP) by using automated LC screening instrumentation and in silico modeling tools. Initial LC MPs and chromatography column screening experiments enabled quick identification of conditions which provided the best resolution in the vicinity of the target compounds, which is further optimized using computer-assisted modeling (LC Simulator from ACD/Labs). The experimental retention times were in good agreement with the predicted retention times from LC Simulator (ΔtR < 7%). This workflow presents a practical workflow to significantly expedite the time needed to develop optimized LC-UV-MS methods, allowing for a facile, automatic method optimization and reducing the amount of manual work involved in developing new methods during drug development.
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Affiliation(s)
- Jeremy Manheim
- Analytical Research and Development, MRL, Merck & Co., Inc., Rahway, NJ, 07065, USA.
| | - Andrew N Singh
- Analytical Research and Development, MRL, Merck & Co., Inc., Rahway, NJ, 07065, USA
| | - Pankaj Aggarwal
- Analytical Research and Development, MRL, Merck & Co., Inc., Rahway, NJ, 07065, USA
| | - Fatima Naser Aldine
- Analytical Research and Development, MRL, Merck & Co., Inc., Rahway, NJ, 07065, USA
| | - Imad A Haidar Ahmad
- Analytical Research and Development, MRL, Merck & Co., Inc., Rahway, NJ, 07065, USA
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12
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Fine J, Mann AKP, Aggarwal P. Structure Based Machine Learning Prediction of Retention Times for LC Method Development of Pharmaceuticals. Pharm Res 2024; 41:365-374. [PMID: 38332389 DOI: 10.1007/s11095-023-03646-2] [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: 10/18/2023] [Accepted: 12/15/2023] [Indexed: 02/10/2024]
Abstract
PURPOSE Significant resources are spent on developing robust liquid chromatography (LC) methods with optimum conditions for all project in the pipeline. Although, data-driven computer assisted modelling has been implemented to shorten the method development timelines, these modelling approaches require project-specific screening data to model retention time (RT) as function of method parameters. Sometimes method re-development is required, leading to additional investments and redundant laboratory work. Cheminformatics techniques have been successfully used to predict the RT of metabolites & other component mixtures for similar use cases. Here we will show that these techniques can be used to model structurally diverse molecules and predictions of these models trained on multiple LC conditions can be used for downstream data-driven modelling. METHODS The Molecular Operating Environment (MOE) was used to calculate over 800 descriptors using the strucutres of the analytes. These descriptors were used to model the RT of the analytes under four chromatographic conditions. These models were then used to create data-driven models using LC-SIM. RESULTS A structural-based Random Forest (RF) model outperformed other techniques in cross-validation studies and predicted the RTs of a randomized test set with a median percentage error less than 4% for all LC conditions. RTs predicted by this structure-based model were used to fit a data-driven model that identifies optimum LC conditions without any additional experimental work. CONCLUSIONS These results show that small training sets yield pharmaceutically relevant models when used in a combination of structure-based and data-driven model.
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Affiliation(s)
- Jonathan Fine
- Analytical Research & Development, MRL, Merck & Co., Inc., Rahway, NJ, 07065, USA
| | | | - Pankaj Aggarwal
- Analytical Research & Development, MRL, Merck & Co., Inc., Rahway, NJ, 07065, USA.
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13
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Hu H, Singh AN, Lehnherr D, Mdluli V, Chun SW, Makarewicz AM, Gouker JR, Ukaegbu O, Li S, Wen X, McLaren DG, Velasquez JE, Moore JC, Galanie S, Appiah-Amponsah E, Regalado EL. Accelerating Pharmaceutical Process Development with an Acoustic Droplet Ejection-Multiple Reaction Monitoring-Mass Spectrometry Workflow. Anal Chem 2024; 96:1138-1146. [PMID: 38165811 DOI: 10.1021/acs.analchem.3c04211] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2024]
Abstract
Fast-paced pharmaceutical process developments (e.g., high-throughput experimentation, directed evolution, and machine learning) involve the introduction of fast, sensitive, and accurate analytical assays using limited sample volumes. In recent years, acoustic droplet ejection (ADE) coupled with an open port interface has been invented as a sampling technology for mass spectrometry, providing high-throughput nanoliter analytical measurements directly from the standard microplates. Herein, we introduce an ADE-multiple reaction monitoring-mass spectrometry (ADE-MRM-MS) workflow to accelerate pharmaceutical process research and development (PR&D). This systematic workflow outlines the selection of MRM transitions and optimization of assay parameters in a data-driven manner using rapid measurements (1 sample/s). The synergy between ADE sampling and MRM analysis enables analytical assays with excellent sensitivity, selectivity, and speed for PR&D reaction screenings. This workflow was utilized to develop new ADE-MRM-MS assays guiding a variety of industrial processes, including (1) screening of Ni-based catalysts for C-N cross-coupling reaction at 1 Hz and (2) high-throughput regioisomer analysis-enabled enzyme library screening for peptide ligation reaction. ADE-MRM-MS assays were demonstrated to deliver accurate results that are comparable to conventional liquid chromatography (LC) experiments while providing >100-fold throughput enhancement.
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Affiliation(s)
- Hang Hu
- Analytical Research and Development, Merck & Co., Inc., Rahway, New Jersey 07065, United States
| | - Andrew N Singh
- Analytical Research and Development, Merck & Co., Inc., Rahway, New Jersey 07065, United States
| | - Dan Lehnherr
- Process Research and Development, Merck & Co., Inc., Rahway, New Jersey 07065, United States
| | - Velabo Mdluli
- Process Research and Development, Merck & Co., Inc., Rahway, New Jersey 07065, United States
| | - Stephanie W Chun
- Process Research and Development, Merck & Co., Inc., Rahway, New Jersey 07065, United States
| | - Amanda M Makarewicz
- Process Research and Development, Merck & Co., Inc., Rahway, New Jersey 07065, United States
| | - Joseph R Gouker
- Process Research and Development, Merck & Co., Inc., Rahway, New Jersey 07065, United States
| | - Ophelia Ukaegbu
- Analytical Research and Development, Merck & Co., Inc., Rahway, New Jersey 07065, United States
| | - Shasha Li
- Analytical Research and Development, Merck & Co., Inc., Rahway, New Jersey 07065, United States
| | - Xiujuan Wen
- Quantitative Biosciences, Merck & Co., Inc., Rahway, New Jersey 07065, United States
| | - David G McLaren
- Quantitative Biosciences, Merck & Co., Inc., Rahway, New Jersey 07065, United States
| | - Juan E Velasquez
- Process Research and Development, Merck & Co., Inc., Rahway, New Jersey 07065, United States
| | - Jeffrey C Moore
- Process Research and Development, Merck & Co., Inc., Rahway, New Jersey 07065, United States
| | - Stephanie Galanie
- Process Research and Development, Merck & Co., Inc., Rahway, New Jersey 07065, United States
| | | | - Erik L Regalado
- Analytical Research and Development, Merck & Co., Inc., Rahway, New Jersey 07065, United States
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14
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De Luca C, Felletti S, Franchina FA, Bozza D, Compagnin G, Nosengo C, Pasti L, Cavazzini A, Catani M. Recent developments in the high-throughput separation of biologically active chiral compounds via high performance liquid chromatography. J Pharm Biomed Anal 2024; 238:115794. [PMID: 37890321 DOI: 10.1016/j.jpba.2023.115794] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2023] [Revised: 10/10/2023] [Accepted: 10/11/2023] [Indexed: 10/29/2023]
Abstract
Bioactive compounds, including active pharmaceutical ingredients (APIs), are often chiral molecules where stereoisomers have different biological and therapeutic activity. Nevertheless, the preparation of these molecules can lead to racemic or scalemic mixtures (it is not trivial to produce just the optically pure compound). The evaluation of the enantiomeric purity of bioactive compounds, and therefore quality, is indeed of fundamental importance for regulatory scopes. Chiral high performance liquid chromatography (HPLC) is the gold standard technique to separate and to purify enantiomers. This comes from the wide availability of commercial chiral stationary phases (CSPs) and operational modes, which makes the technique extremely versatile. In recent years, the most relevant trend in the field of chiral analytical HPLC has been the development of CSPs suitable for fast or even ultrafast separations, thus favoring the high throughput screening of biologically active chiral compounds. This process has somehow lagged behind compared to achiral HPLC, due to a series of practical and fundamental issues. The experience has shown how in chiral chromatography even very basic concepts, such as the supposed kinetic superiority of core-shell (pellicular) particles over fully porous ones to improve the chromatographic efficiency, cannot be taken for granted. In this review, the most relevant fundamental and practical features that must be taken into consideration to design successful high-throughput, fast enantioseparations will be discussed. Afterwards, the main classes of CSPs and the most relevant, recent (last five-year) high-throughput applications in the field of the separation of chiral bioactive compounds (for pharmaceutical, forensic, food, and omics applications) will be considered.
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Affiliation(s)
- Chiara De Luca
- Department of Chemical, Pharrmaceutical and Agricultural Sciences, University of Ferrara, via L. Borsari 46, Ferrara 44121, Italy
| | - Simona Felletti
- Department of Environmental and Prevention Sciences, University of Ferrara, via L. Borsari 46, Ferrara 44121, Italy
| | - Flavio Antonio Franchina
- Department of Chemical, Pharrmaceutical and Agricultural Sciences, University of Ferrara, via L. Borsari 46, Ferrara 44121, Italy
| | - Desiree Bozza
- Department of Chemical, Pharrmaceutical and Agricultural Sciences, University of Ferrara, via L. Borsari 46, Ferrara 44121, Italy
| | - Greta Compagnin
- Department of Chemical, Pharrmaceutical and Agricultural Sciences, University of Ferrara, via L. Borsari 46, Ferrara 44121, Italy
| | - Chiara Nosengo
- Department of Chemical, Pharrmaceutical and Agricultural Sciences, University of Ferrara, via L. Borsari 46, Ferrara 44121, Italy
| | - Luisa Pasti
- Department of Environmental and Prevention Sciences, University of Ferrara, via L. Borsari 46, Ferrara 44121, Italy
| | - Alberto Cavazzini
- Department of Chemical, Pharrmaceutical and Agricultural Sciences, University of Ferrara, via L. Borsari 46, Ferrara 44121, Italy.
| | - Martina Catani
- Department of Chemical, Pharrmaceutical and Agricultural Sciences, University of Ferrara, via L. Borsari 46, Ferrara 44121, Italy
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15
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Dunn ZD, Bohman P, Quinteros A, Sauerborn B, Milman F, Patel M, Kargupta R, Wu S, Hornshaw M, Barrientos R, Bones J, Tayi VS, Abaroa N, Patel B, Appiah-Amponsah E, Regalado EL. Automated Online-Sampling Multidimensional Liquid Chromatography with Feedback-Control Capability as a Framework for Real-Time Monitoring of mAb Critical Quality Attributes in Multiple Bioreactors. Anal Chem 2023; 95:18130-18138. [PMID: 38015205 DOI: 10.1021/acs.analchem.3c03528] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2023]
Abstract
Real-time monitoring of biopharmaceutical reactors is becoming increasingly important as the processes become more complex. During the continuous manufacturing of monoclonal antibodies (mAbs), the desired mAb product is continually created and collected over a 30 day process, where there can be changes in quality over that time. Liquid chromatography (LC) is the workhorse instrumentation capable of measuring mAb concentration as well as quality attributes such as aggregation, charge variants, oxidation, etc. However, traditional offline sampling is too infrequent to fully characterize bioprocesses, and the typical time from sample generation to data analysis and reporting can take weeks. To circumvent these limitations, an automated online sampling multidimensional workflow was developed to enable streamlined measurements of mAb concentration, aggregation, and charge variants. This analytical framework also facilitates automated data export for real-time analysis of up to six bioreactors, including feedback-controlling capability using readily available LC technology. This workflow increases the data points per bioreactor, improving the understanding of each experiment while also reducing the data turnaround time from weeks to hours. Examples of effective real-time analyses of mAb critical quality attributes are illustrated, showing substantial throughput improvements and accurate results while minimizing labor and manual intervention.
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Affiliation(s)
- Zachary D Dunn
- Analytical Research and Development, MRL, Merck & Co., Inc., Rahway, New Jersey 07065, United States
| | - Patrick Bohman
- Thermo Fisher Scientific, 168 Third Avenue, Waltham, Massachusetts 02451, United States
| | - Alexis Quinteros
- Process Research and Development, MRL, Merck & Co., Inc., Rahway, New Jersey 07065, United States
| | - Brian Sauerborn
- Engineering, MRL, Merck & Co., Inc., Rahway, New Jersey 07065, United States
| | - Felix Milman
- Engineering, MRL, Merck & Co., Inc., Rahway, New Jersey 07065, United States
| | - Misaal Patel
- Process Research and Development, MRL, Merck & Co., Inc., Rahway, New Jersey 07065, United States
| | - Roli Kargupta
- Process Research and Development, MRL, Merck & Co., Inc., Rahway, New Jersey 07065, United States
| | - Suyang Wu
- Process Research and Development, MRL, Merck & Co., Inc., Rahway, New Jersey 07065, United States
| | - Martin Hornshaw
- Thermo Fisher Scientific, 168 Third Avenue, Waltham, Massachusetts 02451, United States
| | - Rodell Barrientos
- Analytical Research and Development, MRL, Merck & Co., Inc., Rahway, New Jersey 07065, United States
| | - Jonathan Bones
- The National Institute for Bioprocessing Research and Training, Foster Avenue, Mount Merrion, Blackrock, Co., Dublin A94 X099, Ireland
- School of Chemical and Bioprocess Engineering, University College Dublin, Belfield, Dublin 4 D04 V1W8, Ireland
| | - Venkata S Tayi
- Process Research and Development, MRL, Merck & Co., Inc., Rahway, New Jersey 07065, United States
| | - Nicholas Abaroa
- Engineering, MRL, Merck & Co., Inc., Rahway, New Jersey 07065, United States
| | - Bhumit Patel
- Analytical Research and Development, MRL, Merck & Co., Inc., Rahway, New Jersey 07065, United States
| | - Emmanuel Appiah-Amponsah
- Analytical Research and Development, MRL, Merck & Co., Inc., Rahway, New Jersey 07065, United States
| | - Erik L Regalado
- Analytical Research and Development, MRL, Merck & Co., Inc., Rahway, New Jersey 07065, United States
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16
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Karongo R, Horak J, Lämmerhofer M. Comprehensive reversed-phase×chiral two-dimensional liquid chromatography coupled to quadrupole-time-of-flight tandem mass spectrometry with post-first dimension flow splitting for untargeted enantioselective amino acid analysis. J Sep Sci 2023; 46:e2300351. [PMID: 37464972 DOI: 10.1002/jssc.202300351] [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: 05/19/2023] [Revised: 07/04/2023] [Accepted: 07/05/2023] [Indexed: 07/20/2023]
Abstract
This work describes a comprehensive achiral × chiral two-dimensional liquid chromatography separation for enantioselective amino acid analysis coupled to electrospray ionization-tandem mass spectrometry detection using data-independent acquisition. Flow splitting after the first and second dimension separation was utilized for volumetric flow reduction and for enabling a multi-detector approach (with ultraviolet, fluorescence, charged aerosol, and MS detection), respectively. Derivatization with 6-aminoquinolyl-N-hydroxysuccinimidyl carbamate provided a chromophore, a fluorophore, and an efficient mass tag for efficient ionization in positive electrospray ionization-mass spectrometry. Chiral columns often have limitations in terms of their chemoselectivity, which may be a problem when complex sample mixtures with structurally related compounds need to be separated. It can be alleviated by a reversed-phase×chiral two-dimensional-liquid chromatography setup, in which the first dimension provides the chemoselectivity and a chiral tandem column constituted of quinine-carbamate derived weak anion-exchanger and zwitterionic ion-exchanger in the second dimension separation of D- and L-amino acid enantiomers. The method was used to control the stereointegrity of the therapeutic peptide octreotide. After hydrolysis, all amino acid constituents were detected with the correct configuration and composition. Some options for flow splitting and integration of destructive detectors in the first dimension separation are outlined.
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Affiliation(s)
- Ryan Karongo
- Institute of Pharmaceutical Sciences, Pharmaceutical (Bio-)Analysis, University of Tübingen, Tübingen, Germany
| | - Jeannie Horak
- Institute of Pharmaceutical Sciences, Pharmaceutical (Bio-)Analysis, University of Tübingen, Tübingen, Germany
- Division of Metabolic and Nutritional Medicine, Dr. von Hauner Children's Hospital, Ludwig-Maximilians-University Munich Medical Center, Munich, Germany
| | - Michael Lämmerhofer
- Institute of Pharmaceutical Sciences, Pharmaceutical (Bio-)Analysis, University of Tübingen, Tübingen, Germany
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17
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Jávor B, Vezse P, Golcs Á, Huszthy P, Tóth T. Enantiodiscriminating Lipophilic Liquid Membrane-Based Assay for High-Throughput Nanomolar Enantioenrichment of Chiral Building Blocks. MEMBRANES 2023; 13:94. [PMID: 36676901 PMCID: PMC9862411 DOI: 10.3390/membranes13010094] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/18/2022] [Revised: 01/01/2023] [Accepted: 01/09/2023] [Indexed: 06/17/2023]
Abstract
The reported optical resolution method was designed to support high-throughput enantioseparation of molecular building blocks obtained by automated small-scale synthetic methods. Lipophilic esters of common resolving agents were prepared and used as liquid membranes on the indifferent polymer surface of a microtiter assay. Chiral model compounds were enriched in one of the enantiomers starting from the aqueous solutions of their racemic mixture. Enantiodiscrimination was provided by forming diastereomeric coordination complexes of lipophilic enantiopure esters with the enantiomers of the chiral building blocks inside the liquid membranes. This enantiomeric recognition resulted in a greater distribution ratio of the preferred isomer in the membrane phase, thus the process enables a simultaneous enantioenrichment of the solutions outside the membrane. This paper reports a novel microplate-integrated stereoselective membrane enrichment technique satisfying the need for automatable enantioseparation on a subpreparative scale.
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Affiliation(s)
- Bálint Jávor
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, Szent Gellért tér 4, H-1111 Budapest, Hungary
| | - Panna Vezse
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, Szent Gellért tér 4, H-1111 Budapest, Hungary
| | - Ádám Golcs
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, Szent Gellért tér 4, H-1111 Budapest, Hungary
| | - Péter Huszthy
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, Szent Gellért tér 4, H-1111 Budapest, Hungary
| | - Tünde Tóth
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, Szent Gellért tér 4, H-1111 Budapest, Hungary
- Centre for Energy Research, Konkoly-Thege Miklós út 29-33, H-1121 Budapest, Hungary
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18
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Handlovic TT, Wahab MF, Armstrong DW. Symmetrization of Peaks in Chiral Chromatography with an Area-Invariant Resolution Enhancement Method. Anal Chem 2022; 94:16638-16646. [DOI: 10.1021/acs.analchem.2c02683] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Affiliation(s)
- Troy T. Handlovic
- Department of Chemistry & Biochemistry, University of Texas at Arlington, Arlington, Texas76019, United States
| | - M. Farooq Wahab
- Department of Chemistry & Biochemistry, University of Texas at Arlington, Arlington, Texas76019, United States
| | - Daniel W. Armstrong
- Department of Chemistry & Biochemistry, University of Texas at Arlington, Arlington, Texas76019, United States
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19
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Haidar Ahmad IA. Automated Column Screening and Computer-Assisted Modeling for Analysis of Complex Drug Samples in Pharmaceutical Laboratories. Chromatographia 2022. [DOI: 10.1007/s10337-022-04192-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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20
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Zhang YP, Xiong LX, Wang Y, Li K, Wang BJ, Xie SM, Zhang JH, Yuan LM. Preparation of chiral stationary phase based on a [3+3] chiral polyimine macrocycle by thiol-ene click chemistry for enantioseparation in normal-phase and reversed-phase high performance liquid chromatography. J Chromatogr A 2022; 1676:463253. [PMID: 35732093 DOI: 10.1016/j.chroma.2022.463253] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2022] [Revised: 06/06/2022] [Accepted: 06/13/2022] [Indexed: 11/25/2022]
Abstract
Polyimine macrocycles are a new class of organic macrocycles with cyclic structures, well-defined molecular cavities, and multiple cooperative binding sites, which have recently aroused considerable research interest in molecular recognition and separation. Herein, we report the bonding of a [3+3] chiral polyimine macrocycle (H3L, C78H78N6O3) on thiol-functionalized silica gel using thiol-ene click chemistry to prepare a chiral stationary phase (CSP) for high performance liquid chromatography (HPLC). The fabricated column exhibited excellent chiral separation capability under both normal-phase and reversed-phase conditions. Fourteen and 10 racemates were well resolved on the column in normal-phase mode (using n-hexane/isopropanol as the mobile phase) and reversed-phase mode (using methanol/water as the mobile phase), respectively, including alcohols, esters, ethers, ketones, aldehydes, epoxides and organic acids. Moreover, the column also shows good selectivity toward positional isomers. Six positional isomers (dinitrobenzene, chloroaniline, bromoaniline, iodoaniline, nitrobrobenzene and nitrochlorobenzene) were well separated on the column. In addition, the effects of the injection mass and mobile phase composition on the separation were investigated. The column shows good reproducibility and stability after multiple injections with the relative standard deviation (RSD) (n = 5) of the retention time and resolution being < 0.96 % and 0.65 %, respectively. This study indicates that this type of chiral polyimine macrocycles is a promising chiral selector for HPLC enantioseparation and will push forward the applications of more novel chiral macrocycles for chiral chromatographic separation.
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Affiliation(s)
- You-Ping Zhang
- Department of Chemistry, Yunnan Normal University, Kunming, 650500, PR China
| | - Ling-Xiao Xiong
- Department of Chemistry, Yunnan Normal University, Kunming, 650500, PR China
| | - Ying Wang
- Department of Chemistry, Yunnan Normal University, Kunming, 650500, PR China
| | - Kuan Li
- Department of Chemistry, Yunnan Normal University, Kunming, 650500, PR China
| | - Bang-Jin Wang
- Department of Chemistry, Yunnan Normal University, Kunming, 650500, PR China
| | - Sheng-Ming Xie
- Department of Chemistry, Yunnan Normal University, Kunming, 650500, PR China.
| | - Jun-Hui Zhang
- Department of Chemistry, Yunnan Normal University, Kunming, 650500, PR China.
| | - Li-Ming Yuan
- Department of Chemistry, Yunnan Normal University, Kunming, 650500, PR China
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21
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Tanács D, Berkecz R, Shahmohammadi S, Forró E, Armstrong DW, Péter A, Ilisz I. Macrocykclic glycopeptides- and derivatized cyclofructan-based chiral stationary phases for the enantioseparation of fluorinated ß-phenylalanine analogs. J Pharm Biomed Anal 2022; 219:114912. [DOI: 10.1016/j.jpba.2022.114912] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2022] [Revised: 06/20/2022] [Accepted: 06/23/2022] [Indexed: 10/17/2022]
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22
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Stafford NP, Cheng MJ, Dinh DN, Verboom KL, Krische MJ. Chiral α-Stereogenic Oxetanols and Azetidinols via Alcohol-Mediated Reductive Coupling of Allylic Acetates: Enantiotopic π-Facial Selection in Symmetric Ketone Addition. ACS Catal 2022; 12:6172-6179. [PMID: 37063244 PMCID: PMC10104534 DOI: 10.1021/acscatal.2c01647] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Iridium-tol-BINAP-catalyzed reductive coupling of allylic acetates with oxetanones and azetidinones mediated by 2-propanol provides chiral α-stereogenic oxetanols and azetidinols. As illustrated in 50 examples, complex, nitrogen-rich substituents that incorporate the top 10 N-heterocycles found in FDA-approved drugs are tolerated. In addition to 2-propanol-mediated reductive couplings, oxetanols and azetidinols may serve dually as reductant and ketone proelectrophiles in redox-neutral C-C couplings via hydrogen auto-transfer, as demonstrated by the conversion of dihydro-1a and dihydro-1b to adducts 3a and 4a, respectively. The present method delivers hitherto inaccessible chiral oxetanols and azetidinols, which are important bioisosteres.
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Affiliation(s)
- Nicholas P. Stafford
- Department of Chemistry, University of Texas at Austin, 105 E 24th Street, Austin, Texas 78712, United States
| | - Melinda J. Cheng
- Department of Chemistry, University of Texas at Austin, 105 E 24th Street, Austin, Texas 78712, United States
| | - Duong Nguyen Dinh
- Department of Chemistry, University of Texas at Austin, 105 E 24th Street, Austin, Texas 78712, United States
| | - Katherine L. Verboom
- Department of Chemistry, University of Texas at Austin, 105 E 24th Street, Austin, Texas 78712, United States
| | - Michael J. Krische
- Department of Chemistry, University of Texas at Austin, 105 E 24th Street, Austin, Texas 78712, United States
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23
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Losacco GL, DaSilva JO, Haidar Ahmad IA, Mangion I, Berger TA, Regalado EL. Parallel chiral sub/supercritical fluid chromatography screening as a framework for accelerated purification of pharmaceutical targets. J Chromatogr A 2022; 1674:463094. [DOI: 10.1016/j.chroma.2022.463094] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2022] [Revised: 04/21/2022] [Accepted: 04/27/2022] [Indexed: 11/27/2022]
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Losacco GL, Hicks MB, DaSilva JO, Wang H, Potapenko M, Tsay FR, Ahmad IAH, Mangion I, Guillarme D, Regalado EL. Automated ion exchange chromatography screening combined with in silico multifactorial simulation for efficient method development and purification of biopharmaceutical targets. Anal Bioanal Chem 2022; 414:3581-3591. [PMID: 35441858 DOI: 10.1007/s00216-022-03982-z] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2021] [Revised: 02/10/2022] [Accepted: 02/15/2022] [Indexed: 11/25/2022]
Abstract
Bioprocess development of increasingly challenging therapeutics and vaccines requires a commensurate level of analytical innovation to deliver critical assays across functional areas. Chromatography hyphenated to numerous choices of detection has undeniably been the preferred analytical tool in the pharmaceutical industry for decades to analyze and isolate targets (e.g., APIs, intermediates, and byproducts) from multicomponent mixtures. Among many techniques, ion exchange chromatography (IEX) is widely used for the analysis and purification of biopharmaceuticals due to its unique selectivity that delivers distinctive chromatographic profiles compared to other separation modes (e.g., RPLC, HILIC, and SFC) without denaturing protein targets upon isolation process. However, IEX method development is still considered one of the most challenging and laborious approaches due to the many variables involved such as elution mechanism (via salt, pH, or salt-mediated-pH gradients), stationary phase's properties (positively or negatively charged; strong or weak ion exchanger), buffer type and ionic strength as well as pH choices. Herein, we introduce a new framework consisting of a multicolumn IEX screening in conjunction with computer-assisted simulation for efficient method development and purification of biopharmaceuticals. The screening component integrates a total of 12 different columns and 24 mobile phases that are sequentially operated in a straightforward automated fashion for both cation and anion exchange modes (CEX and AEX, respectively). Optimal and robust operating conditions are achieved via computer-assisted simulation using readily available software (ACD Laboratories/LC Simulator), showcasing differences between experimental and simulated retention times of less than 0.5%. In addition, automated fraction collection is also incorporated into this framework, illustrating the practicality and ease of use in the context of separation, analysis, and purification of nucleotides, peptides, and proteins. Finally, we provide examples of the use of this IEX screening as a framework to identify efficient first dimension (1D) conditions that are combined with MS-friendly RPLC conditions in the second dimension (2D) for two-dimensional liquid chromatography experiments enabling purity analysis and identification of pharmaceutical targets.
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Affiliation(s)
- Gioacchino Luca Losacco
- Analytical Research and Development, MRL, Merck & Co., Inc., 126 E. Lincoln Avenue, Rahway, NJ, 07065, USA.
| | - Michael B Hicks
- Analytical Research and Development, MRL, Merck & Co., Inc., 126 E. Lincoln Avenue, Rahway, NJ, 07065, USA
| | - Jimmy O DaSilva
- Analytical Research and Development, MRL, Merck & Co., Inc., 126 E. Lincoln Avenue, Rahway, NJ, 07065, USA
| | - Heather Wang
- Analytical Research and Development, MRL, Merck & Co., Inc., 126 E. Lincoln Avenue, Rahway, NJ, 07065, USA
| | - Miraslava Potapenko
- Analytical Research and Development, MRL, Merck & Co., Inc., 126 E. Lincoln Avenue, Rahway, NJ, 07065, USA
| | - Fuh-Rong Tsay
- Analytical Research and Development, MRL, Merck & Co., Inc., 126 E. Lincoln Avenue, Rahway, NJ, 07065, USA
| | - Imad A Haidar Ahmad
- Analytical Research and Development, MRL, Merck & Co., Inc., 126 E. Lincoln Avenue, Rahway, NJ, 07065, USA
| | - Ian Mangion
- Analytical Research and Development, MRL, Merck & Co., Inc., 126 E. Lincoln Avenue, Rahway, NJ, 07065, USA
| | - Davy Guillarme
- School of Pharmaceutical Sciences, University of Geneva, CMU, Rue Michel-Servet 1, 1211, Geneva 4, Switzerland
- Institute of Pharmaceutical Sciences of Western Switzerland, University of Geneva, CMU, Rue Michel-Servet 1, 1211, Geneva 4, Switzerland
| | - Erik L Regalado
- Analytical Research and Development, MRL, Merck & Co., Inc., 126 E. Lincoln Avenue, Rahway, NJ, 07065, USA.
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