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George MAR, Dopfer O. IR spectrum of SiH 3OH 2+SiH 4: cationic OH⋯HSi dihydrogen bond versus charge-inverted SiH⋯Si hydrogen bond. Phys Chem Chem Phys 2024. [PMID: 39171378 DOI: 10.1039/d4cp02428a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/23/2024]
Abstract
The low electronegativity of Si gives rise to a variety of nonconventional intermolecular interactions in clusters of silanes and their derivatives, which have not been well characterized yet. Herein, we characterize the structures of various isomers of bare and Ar-tagged SiH3OH2+SiH4 dimers composed of protonated silanol and silane by infrared photodissociation (IRPD) of mass-selected ions and dispersion-corrected density functional calculations (B3LYP-D3/aug-cc-pVTZ). The analysis of the IRPD spectra recorded in the OH stretch range reveals the competition between two types of nonconventional hydrogen bonds (H-bonds). The first one represents a OH⋯HSi ionic dihydrogen bond (DHB), in which SiH4 interacts with the H2O moiety of SiH3OH2+. The second one represents a charge-inverted SiH⋯Si ionic H-bond (CIHB), in which the SiH4 ligand interacts with the SiH3 moiety of SiH3OH2+. The latter may also be considered as a weak three-centre two-electron (3c-2e) bond. Although both types of H-bonds are computed to have comparable interaction strengths for SiH3OH2+SiH4 (D0 ≈ 35-40 kJ mol-1), DHB isomers dominate the population in the supersonic plasma expansion, while the abundance of CIHB isomers is roughly one order of magnitude lower, probably as a result of entropic factors.
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Affiliation(s)
| | - Otto Dopfer
- Institut für Optik und Atomare Physik, Technische Universität Berlin, Berlin 10623, Germany.
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2
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Tereba-Mamani CJ, Blázquez-Mateu M, Ruiz-Angel MJ, García-Alvarez-Coque MC. The role of the cation and anion in aqueous liquid chromatography with sodium dodecyl sulphate and imidazolium-based ionic liquids as mobile phase reagents. Anal Chim Acta 2024; 1318:342942. [PMID: 39067921 DOI: 10.1016/j.aca.2024.342942] [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: 04/10/2024] [Revised: 06/10/2024] [Accepted: 07/03/2024] [Indexed: 07/30/2024]
Abstract
BACKGROUND In reversed-phase liquid chromatography, solute retention is primarily influenced by interactions between a nonpolar stationary phase and a moderately polar hydro-organic mobile phase, based on the solute lipophilicity. However, challenges regarding retention and peak tailing can arise due to ionic interactions between positively charged analytes and free silanols present on silica-based stationary phases. To address these challenges, incorporating surfactants and ionic liquids (ILs) into the mobile phase offers an effective solution. These additives synergistically enhance chromatographic performance through electrostatic and lipophilic interactions, which enable fine-tuning of selectivity and improved separation efficiency. RESULTS This study explores the chromatographic behaviour of several basic compounds in aqueous mixtures containing the anionic surfactant sodium dodecyl sulphate (SDS), above its critical micellar concentration, combined with various 1-alkyl-3-methylimidazolium-based ionic liquids (ILs) featuring chloride, tetrafluoroborate, and hexafluorophosphate anions, all without the addition of organic solvents. Specifically, this research investigates the influence of different anion types within the ILs and considers the impact of the IL cations. Analysis of solute peak profiles reveals narrow and symmetrical peaks. By introducing tetrafluoroborate and hexafluorophosphate IL anions into a mobile phase that contains an anionic surfactant, the study sheds light on the interactions occurring within the chromatographic column. This enhanced understanding of the combined effects of surfactants and ILs contributes to refining chromatographic methodologies. SIGNIFICANCE This research highlights the importance of carefully selecting the appropriate IL when incorporating it into a micellar mobile phase alongside SDS. This combination results in practical retention times that surpass the performance achieved with either the surfactant or IL alone in the mobile phase. The study particularly emphasises the impact of the IL anion, especially in the absence of SDS and organic solvents. This unveils interactions that are otherwise obscured in micellar and hydro-organic media, providing new insights into chromatographic dynamics.
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Affiliation(s)
- C J Tereba-Mamani
- Department de Química Analítica, Universitat de València, C/Dr. Moliner 50, Burjassot, Spain
| | - M Blázquez-Mateu
- Department de Química Analítica, Universitat de València, C/Dr. Moliner 50, Burjassot, Spain
| | - M J Ruiz-Angel
- Department de Química Analítica, Universitat de València, C/Dr. Moliner 50, Burjassot, Spain
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3
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Haseeb A, Fernandes MX, Samuelsson J. Modelling the pH dependent retention and competitive adsorption of charged and ionizable solutes in mixed-mode and reversed-phase liquid chromatography. J Chromatogr A 2024; 1730:465058. [PMID: 38876077 DOI: 10.1016/j.chroma.2024.465058] [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: 04/26/2024] [Revised: 06/04/2024] [Accepted: 06/06/2024] [Indexed: 06/16/2024]
Abstract
This study investigated the influence of pH on the retention of solutes using a mixed-mode column with carboxyl (-COOH) groups acting as weak cation exchanger bonded to the terminal of C18 ligands (C18-WCX column) and a traditional reversed-phase C18 column. First, a model based on electrostatic theory was derived and successfully used to predict the retention of charged solutes (charged, and ionizable) as a function of mobile phase pH on a C18-WCX column. While the Horváth model predicts the pH-dependent retention of ionizable solutes in reversed-phase liquid chromatography (RPLC) solely based on solute ionization, the developed model incorporates the concept of surface potential generated on the surface of the stationary phase and its variation with pH. To comprehensively understand the adsorption process, adsorption isotherms for these solutes were individually acquired on the C18-WCX and reversed-phase C18 columns. The adsorption isotherms followed the Langmuir model for the uncharged solute and the electrostatically modified Langmuir model for charged solutes. The elution profiles for the single components were calculated from these isotherms using the equilibrium dispersion column model and were found to be in close agreement with the experimental elution profiles. To enable modelling of two-component cases involving charged solute(s), a competitive adsorption isotherm model based on electrostatic theory was derived. This model was later successfully used to calculate the elution profiles of two components for scenarios involving (a) a C18 Column: two charged solutes, (b) a C18 Column: one charged and one uncharged solute, and (c) a C18-WCX Column: two charged solutes. The strong alignment between the experimental and calculated elution profiles in all three scenarios validated the developed competitive adsorption model.
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Affiliation(s)
- Abdul Haseeb
- Department of Engineering and Chemical Sciences, Karlstad University, SE-651 88 Karlstad, Sweden
| | - Miguel Xavier Fernandes
- Department of Engineering and Chemical Sciences, Karlstad University, SE-651 88 Karlstad, Sweden
| | - Jörgen Samuelsson
- Department of Engineering and Chemical Sciences, Karlstad University, SE-651 88 Karlstad, Sweden.
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4
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Kaya B, Gholam Azad M, Suleymanoglu M, Harmer JR, Wijesinghe TP, Richardson V, Zhao X, Bernhardt PV, Dharmasivam M, Richardson DR. Isosteric Replacement of Sulfur to Selenium in a Thiosemicarbazone: Promotion of Zn(II) Complex Dissociation and Transmetalation to Augment Anticancer Efficacy. J Med Chem 2024; 67:12155-12183. [PMID: 38967641 DOI: 10.1021/acs.jmedchem.4c00884] [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: 07/06/2024]
Abstract
We implemented isosteric replacement of sulfur to selenium in a novel thiosemicarbazone (PPTP4c4mT) to create a selenosemicarbazone (PPTP4c4mSe) that demonstrates potentiated anticancer efficacy and selectivity. Their design specifically incorporated cyclohexyl and styryl moieties to sterically inhibit the approach of their Fe(III) complexes to the oxy-myoglobin heme plane. Importantly, in contrast to the Fe(III) complexes of the clinically trialed thiosemicarbazones Triapine, COTI-2, and DpC, the Fe(III) complexes of PPTP4c4mT and PPTP4c4mSe did not induce detrimental oxy-myoglobin oxidation. Furthermore, PPTP4c4mSe demonstrated more potent antiproliferative activity than the homologous thiosemicarbazone, PPTP4c4mT, with their selectivity being superior or similar, respectively, to the clinically trialed thiosemicarbazone, COTI-2. An advantageous property of the selenosemicarbazone Zn(II) complexes relative to their thiosemicarbazone analogues was their greater transmetalation to Cu(II) complexes in lysosomes. This latter effect probably promoted their antiproliferative activity. Both ligands down-regulated multiple key receptors that display inter-receptor cooperation that leads to aggressive and resistant breast cancer.
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Affiliation(s)
- Busra Kaya
- Centre for Cancer Cell Biology and Drug Discovery, Griffith University, Nathan, Brisbane 4111, Australia
| | - Mahan Gholam Azad
- Centre for Cancer Cell Biology and Drug Discovery, Griffith University, Nathan, Brisbane 4111, Australia
| | - Mediha Suleymanoglu
- Centre for Cancer Cell Biology and Drug Discovery, Griffith University, Nathan, Brisbane 4111, Australia
- Department of Medical Biology, Istanbul Faculty of Medicine, Istanbul University, Fatih, Istanbul 34093, Turkey
| | - Jeffrey R Harmer
- Centre for Advanced Imaging, University of Queensland, Brisbane 4072, Australia
| | - Tharushi P Wijesinghe
- Centre for Cancer Cell Biology and Drug Discovery, Griffith University, Nathan, Brisbane 4111, Australia
| | - Vera Richardson
- Centre for Cancer Cell Biology and Drug Discovery, Griffith University, Nathan, Brisbane 4111, Australia
| | - Xiao Zhao
- Centre for Cancer Cell Biology and Drug Discovery, Griffith University, Nathan, Brisbane 4111, Australia
| | - Paul V Bernhardt
- School of Chemistry and Molecular Biosciences, University of Queensland, Brisbane 4072, Australia
| | - Mahendiran Dharmasivam
- Centre for Cancer Cell Biology and Drug Discovery, Griffith University, Nathan, Brisbane 4111, Australia
| | - Des R Richardson
- Centre for Cancer Cell Biology and Drug Discovery, Griffith University, Nathan, Brisbane 4111, Australia
- Department of Pathology and Biological Responses, Nagoya University Graduate School of Medicine, Nagoya 466-8550, Japan
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5
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Cecil T, Bautista J, Collinson MM, Rutan SC. Preparation and characterization of stationary phase gradients on C8 liquid chromatography columns. J Chromatogr A 2024; 1727:464974. [PMID: 38761702 DOI: 10.1016/j.chroma.2024.464974] [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: 02/23/2024] [Revised: 05/02/2024] [Accepted: 05/06/2024] [Indexed: 05/20/2024]
Abstract
Continuous C8 stationary phase gradients are created on commercial Waters Symmetry Shield RP8 columns by strategically cleaving the C8 moieties in a time-dependent fashion. The method relies on the controlled infusion of a trifluoroacetic acid/water/acetonitrile solution through the column to cleave the organic functionality (e.g., C8) from the siloxane framework. The bond cleavage solution is reactive enough to cleave the functional groups, even with polar groups embedded within the stationary phase to protect the silica. Both the longitudinal and radial heterogeneity were evaluated by extruding the silica powder into polyethylene tubing and evaluating the percent carbon content in the different sections using thermogravimetric analysis (TGA). TGA analysis shows the presence of a stationary phase gradient in the longitudinal direction but not in the radial direction. Two different gradient profiles were formed with good reproducibility by modifying the infusion method: one exhibited an 'S'-shaped gradient while the other exhibited a steep exponential-like gradient. The gradients were characterized chromatographically using test mixtures, and the results showed varied retention characteristics and an enhanced ability to resolve nicotine analytes.
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Affiliation(s)
- Thomas Cecil
- Department of Chemistry, Virginia Commonwealth University, Box 842006, Richmond, VA 23284-2006, USA
| | - Judith Bautista
- Dow Chemical, 230 Abner Jackson Pkwy, Lake Jackson, TX 77566, USA
| | - Maryanne M Collinson
- Department of Chemistry, Virginia Commonwealth University, Box 842006, Richmond, VA 23284-2006, USA.
| | - Sarah C Rutan
- Department of Chemistry, Virginia Commonwealth University, Box 842006, Richmond, VA 23284-2006, USA
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6
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Mao M, Ahrens L, Luka J, Contreras F, Kurkina T, Bienstein M, Sárria Pereira de Passos M, Schirinzi G, Mehn D, Valsesia A, Desmet C, Serra MÁ, Gilliland D, Schwaneberg U. Material-specific binding peptides empower sustainable innovations in plant health, biocatalysis, medicine and microplastic quantification. Chem Soc Rev 2024; 53:6445-6510. [PMID: 38747901 DOI: 10.1039/d2cs00991a] [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: 05/30/2024]
Abstract
Material-binding peptides (MBPs) have emerged as a diverse and innovation-enabling class of peptides in applications such as plant-/human health, immobilization of catalysts, bioactive coatings, accelerated polymer degradation and analytics for micro-/nanoplastics quantification. Progress has been fuelled by recent advancements in protein engineering methodologies and advances in computational and analytical methodologies, which allow the design of, for instance, material-specific MBPs with fine-tuned binding strength for numerous demands in material science applications. A genetic or chemical conjugation of second (biological, chemical or physical property-changing) functionality to MBPs empowers the design of advanced (hybrid) materials, bioactive coatings and analytical tools. In this review, we provide a comprehensive overview comprising naturally occurring MBPs and their function in nature, binding properties of short man-made MBPs (<20 amino acids) mainly obtained from phage-display libraries, and medium-sized binding peptides (20-100 amino acids) that have been reported to bind to metals, polymers or other industrially produced materials. The goal of this review is to provide an in-depth understanding of molecular interactions between materials and material-specific binding peptides, and thereby empower the use of MBPs in material science applications. Protein engineering methodologies and selected examples to tailor MBPs toward applications in agriculture with a focus on plant health, biocatalysis, medicine and environmental monitoring serve as examples of the transformative power of MBPs for various industrial applications. An emphasis will be given to MBPs' role in detecting and quantifying microplastics in high throughput, distinguishing microplastics from other environmental particles, and thereby assisting to close an analytical gap in food safety and monitoring of environmental plastic pollution. In essence, this review aims to provide an overview among researchers from diverse disciplines in respect to material-(specific) binding of MBPs, protein engineering methodologies to tailor their properties to application demands, re-engineering for material science applications using MBPs, and thereby inspire researchers to employ MBPs in their research.
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Affiliation(s)
- Maochao Mao
- Lehrstuhl für Biotechnologie, RWTH Aachen University, Worringerweg 3, 52074 Aachen, Germany.
| | - Leon Ahrens
- Lehrstuhl für Biotechnologie, RWTH Aachen University, Worringerweg 3, 52074 Aachen, Germany.
| | - Julian Luka
- Lehrstuhl für Biotechnologie, RWTH Aachen University, Worringerweg 3, 52074 Aachen, Germany.
| | - Francisca Contreras
- Lehrstuhl für Biotechnologie, RWTH Aachen University, Worringerweg 3, 52074 Aachen, Germany.
| | - Tetiana Kurkina
- Lehrstuhl für Biotechnologie, RWTH Aachen University, Worringerweg 3, 52074 Aachen, Germany.
| | - Marian Bienstein
- Lehrstuhl für Biotechnologie, RWTH Aachen University, Worringerweg 3, 52074 Aachen, Germany.
| | | | | | - Dora Mehn
- European Commission, Joint Research Centre (JRC), Ispra, Italy
| | - Andrea Valsesia
- European Commission, Joint Research Centre (JRC), Ispra, Italy
| | - Cloé Desmet
- European Commission, Joint Research Centre (JRC), Ispra, Italy
| | | | | | - Ulrich Schwaneberg
- Lehrstuhl für Biotechnologie, RWTH Aachen University, Worringerweg 3, 52074 Aachen, Germany.
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7
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Zhou Y, Ramirez A, Yuill EM, Wang Q. Mechanistic studies to understand peak tailing due to sulfinic acid- and carboxylic acid-silanophilic interactions in reversed-phase liquid chromatography. J Chromatogr A 2024; 1721:464819. [PMID: 38537485 DOI: 10.1016/j.chroma.2024.464819] [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: 01/08/2024] [Revised: 03/13/2024] [Accepted: 03/14/2024] [Indexed: 04/13/2024]
Abstract
Silanophilic interactions are a primary contributor to peak tailing of acidic pharmaceutical compounds, thus a thorough understanding is especially important for reversed-phase liquid chromatography (RPLC) method development. Herein, a sulfinic acid compound that exhibited severe peak tailing in RPLC with acidic mobile phases was carefully studied. Results indicated that the neutral protonated form of the sulfinic acid is involved in the strong interaction that leads to peak tailing, but that tailing can be mitigated with a blocking effect achieved through use of acetic acid modifier in the mobile phase. Peak tailing was also observed with other structurally-similar sulfinic acids and carboxylic acids but was, in general, less severe with the latter. The Hydrophobic Subtraction Model (HSM) was applied to six commercial C18 columns that exhibited different tailing behaviors for the sulfinic acid compound in attempts to identify key sites of interaction within the stationary phase. A combination of heated acid column wash experiments and density functional theory (DFT) calculations indicate that the differential interactions of the acids with vicinal silanol pairs in the stationary phase play a major role in peak tailing.
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Affiliation(s)
- Yiyang Zhou
- Chemical Process Development, Bristol Myers Squibb Company, 1 Squibb Drive, New Brunswick, NJ 08903, USA.
| | - Antonio Ramirez
- Chemical Process Development, Bristol Myers Squibb Company, 1 Squibb Drive, New Brunswick, NJ 08903, USA
| | - Elizabeth M Yuill
- Chemical Process Development, Bristol Myers Squibb Company, 1 Squibb Drive, New Brunswick, NJ 08903, USA
| | - Qinggang Wang
- Chemical Process Development, Bristol Myers Squibb Company, 1 Squibb Drive, New Brunswick, NJ 08903, USA
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8
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Xu M, Wu Z. A mixed-mode reversed-phase/strong-anion-exchange stationary phase: Analyte-retention stability and application in the analysis of nonsteroidal anti-inflammatory drugs. J Chromatogr A 2024; 1722:464871. [PMID: 38593520 DOI: 10.1016/j.chroma.2024.464871] [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: 01/16/2024] [Revised: 04/01/2024] [Accepted: 04/03/2024] [Indexed: 04/11/2024]
Abstract
Mixed-mode reversed-phase/anion-exchange chromatography (RP/AEX) is an effective method for the chromatographic analysis of acidic drugs because it combines reversed-phase chromatography (RP) with anion-exchange chromatography (AEX). However, the result repeatability for the RP/AEX analysis of acidic drugs is frequently compromised by the detrimental effects of residual silanol groups in an RP/AEX stationary phase on peak separation and analyte retention. In this study, an RP/weak-AEX stationary phase with amino anion-exchange groups, Sil-AA, was prepared. Subsequently, an RP/strong-AEX stationary phase, Sil-PBQA, was prepared by replacing the amino groups in Sil-AA with a benzene ring and a benzyl-containing quaternary ammonium salt. The chromatographic behaviors of Sil-PBQA and Sil-AA were compared, and the effect of residual silanol groups on the chromatographic behavior of an RP/AEX stationary phase was evaluated. Residual silanol groups not only caused additional electrostatic interactions for acidic analytes, but also competed with the analytes for the anion-exchange sites in an RP/AEX stationary phase. The effects of different salt-containing mobile-phase systems on the analyte-retention behavior of Sil-PBQA were investigated to develop a method that enhanced the repeatability of the RP/AEX acidic-analyte-analysis results obtained using Sil-PBQA and facilitated the separation of nonsteroidal anti-inflammatory drugs on Sil-PBQA. The ideas presented in this paper can improve the separation of peaks and repeatability of results in the RP/AEX analysis of acidic drugs.
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Affiliation(s)
- Meng Xu
- School of Pharmaceutical Science & Technology, Tianjin University, 92 Weijin Road, Tianjin 300072, China.
| | - Zhenwei Wu
- School of Pharmaceutical Science & Technology, Tianjin University, 92 Weijin Road, Tianjin 300072, China
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9
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Walter TH, Yang J. Assessment of the reproducibility of a C 18 bonded phase based on ethylene-bridged hybrid organic/inorganic particles. J Chromatogr A 2024; 1716:464637. [PMID: 38217961 DOI: 10.1016/j.chroma.2024.464637] [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: 11/01/2023] [Revised: 01/05/2024] [Accepted: 01/07/2024] [Indexed: 01/15/2024]
Abstract
The batch-to-batch reproducibility of an endcapped trifunctional C18 bonded phase based on ethylene-bridged hybrid particles was assessed using a modified version of a chromatographic test developed by Neue and coworkers. The test involves the isocratic separation of six compounds chosen to probe different characteristics of the stationary phase, including hydrophobicity, hydrogen bonding and cation-exchange. The assessment was based on results for a total of 471 batches manufactured and tested over a 19 year time span. The results were compared to those for an endcapped monofunctional C18 bonded phase on silica particles, based on results generated for 246 batches over 29 years. Overall, both stationary phases show similar reproducibility, with relative standard deviations for the relative retentions ranging from 0.1 to 3.2 %.
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Affiliation(s)
- Thomas H Walter
- Waters Corporation, 34 Maple Street, Milford, MA 01757, USA.
| | - Jun Yang
- Waters Corporation, 34 Maple Street, Milford, MA 01757, USA
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10
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Vörös D, Angeletti A, Franchini C, Mai S, González L. Adsorption of 4-( N, N-Dimethylamino)-4'-nitrostilbene on an Amorphous Silica Glass Surface. THE JOURNAL OF PHYSICAL CHEMISTRY. C, NANOMATERIALS AND INTERFACES 2023; 127:22964-22974. [PMID: 38053626 PMCID: PMC10694811 DOI: 10.1021/acs.jpcc.3c05552] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/17/2023] [Revised: 11/03/2023] [Accepted: 11/03/2023] [Indexed: 12/07/2023]
Abstract
Stilbenes are a compelling class of organic photoswitches with a high degree of tunability that sensitively depend on their environment. In this study, we investigate the adsorption properties of 4-(N,N-dimethylamino)-4'-nitrostilbene (DANS), a push-pull stilbene, on amorphous silica glass. Plane-wave density functional theory (DFT) calculations are used to understand how the trans and cis isomers of DANS interact with the amorphous surface and which are the most preferred modes of adsorption. Our calculations revealed that the O-H···O hydrogen bonds between the nitro group and hydroxyl groups of the silica surface dominate the intramolecular interaction. In addition to hydrogen bonding, O-H···π interactions with the aromatic ring and double bond play a critical role in adsorption, whereas C-H···O interactions are present, but contribute little. Therefore, both isomers of DANS favor parallel orientations such that not only the functional groups but also the aromatic parts can strongly interact with the glass surface.
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Affiliation(s)
- Dóra Vörös
- Institute
of Theoretical Chemistry, Faculty of Chemistry, University of Vienna, Währinger Straße 17, 1090 Vienna, Austria
- Vienna
Doctoral School in Physics, University of
Vienna, Boltzmanngasse
5, 1090 Vienna, Austria
| | - Andrea Angeletti
- Computational
Materials Physics, Faculty of Physics, University
of Vienna, Kolingasse
14-16, 1090 Vienna, Austria
- Vienna
Doctoral School in Physics, University of
Vienna, Boltzmanngasse
5, 1090 Vienna, Austria
| | - Cesare Franchini
- Computational
Materials Physics, Faculty of Physics, University
of Vienna, Kolingasse
14-16, 1090 Vienna, Austria
- Department
of Physics and Astronomy ’Augusto Righi’, Alma Mater Studiorum—Università di Bologna, Bologna 40127, Italy
| | - Sebastian Mai
- Institute
of Theoretical Chemistry, Faculty of Chemistry, University of Vienna, Währinger Straße 17, 1090 Vienna, Austria
| | - Leticia González
- Institute
of Theoretical Chemistry, Faculty of Chemistry, University of Vienna, Währinger Straße 17, 1090 Vienna, Austria
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11
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Lv Q, Wu Y, Chen L, Dai J. "Ghost peaks" in reversed-phase liquid chromatography separation of an electron-rich aniline compound: Mechanism and solution for this phenomenon. J Chromatogr A 2023; 1707:464274. [PMID: 37586301 DOI: 10.1016/j.chroma.2023.464274] [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: 06/06/2023] [Revised: 08/01/2023] [Accepted: 08/01/2023] [Indexed: 08/18/2023]
Abstract
Two "ghost peaks" appeared in the process of developing an impurities analytical method for an electron-rich aniline compound by RP-HPLC. Surprisingly, the "ghost peaks" disappeared when the mobile phase was re-prepared. The "ghost peak" slowly began to reappear and gradually increased after increasing the injection volume or changing different instruments and columns. In this paper, the structures of two "ghost peaks" were analyzed by LC-MS/MS, which were identified as the dimer of the main peak and the oxidation products of the dimer. The mechanism was confirmed by studying the "ghost peaks" appearance phenomenon in the mobile phase with different pH values, different types of buffer salts, and different brand chromatographic columns. The potential chemical behavior of this type of compound on the column was clearly revealed in the process of RP-HPLC separation. The coupling reaction of electron-rich aniline compounds can be induced by partial or complete dissociation of the silanol group to Si-O-in the stationary phase of a reversed-phase chromatographic column under neutral and basic conditions of the mobile phase. Adding inorganic salts to the mobile phase can inhibit the reaction, and the higher salt concentration, the stronger the effect.
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Affiliation(s)
- Qinghui Lv
- Analytical Research Department, Chengdu Hyperway Pharmaceutical Co., Ltd., No. 802, 8th Floor, Building 7, No. 88, Keyuan South Road, Hi-tech Zone, Chengdu, Sichuan Province, PR China
| | - Yue Wu
- School of Pharmacy, Chengdu Medical College, No.783, Xindu Avenue, Xindu District, Chengdu, Sichuan Province, PR China
| | - Lili Chen
- Analytical Research Department, Chengdu Hyperway Pharmaceutical Co., Ltd., No. 802, 8th Floor, Building 7, No. 88, Keyuan South Road, Hi-tech Zone, Chengdu, Sichuan Province, PR China.
| | - Jing Dai
- School of Pharmacy, Chengdu Medical College, No.783, Xindu Avenue, Xindu District, Chengdu, Sichuan Province, PR China.
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12
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Yoshii T, Nakano K, Okuda T, Citterio D, Hiruta Y. Evaluation of separation performance for eggshell-based reversed-phase HPLC columns by controlling particle size and application in quantitative therapeutic drug monitoring. ANALYTICAL METHODS : ADVANCING METHODS AND APPLICATIONS 2023; 15:1790-1796. [PMID: 36938787 DOI: 10.1039/d3ay00219e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
Eggshell-based reversed-phase packing materials were applied to an analytical column for high-performance liquid chromatography. Commercially available eggshell powder was classified by a cyclone system to obtain three types of particles with different diameters (arithmetic mean ± standard deviation: 4.3 ± 3.8, 5.6 ± 3.3, and 9.5 ± 5.5 μm). Sedimentation separation removed tiny particles from each sample, resulting in particles with arithmetic means of 6.6 ± 5.5, 7.3 ± 4.5, and 10.2 ± 5.0 μm, respectively. The unclassified particles and three particle types treated with sedimentation separation were subsequently packed into analytical columns (150 mm × 4.6 mm I.D.), and their separation efficiencies were evaluated by comparing their height equivalent to a theoretical plate (HETP). The column without sedimentation separation exhibited the highest HETP, whereas the columns with sedimentation separation showed better separation efficiency and lower back pressure. The column with the best separation efficiency was applied for the separation of 10 alkylbenzenes and 5 steroids, and all peaks were observed with complete separation (peak resolution: RS > 1.5). Finally, the column was used for quantitative analysis of voriconazole, an azole antifungal agent, and imatinib, a first-generation molecularly targeted drug for cancer treatment, in spiked whole blood. Excellent accuracy (99.1-102.8%) and precision (0.6-1.9%) were observed for the spiked drugs and long-term stability (>3000 column volumes of mobile phase flow) indicated good applicability of the developed eggshell-based column as an analytical column for routine analyses of therapeutic drugs in blood.
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Affiliation(s)
- Tomoka Yoshii
- Department of Applied Chemistry, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama, Kanagawa 223-8522, Japan.
| | - Kohei Nakano
- Department of Applied Chemistry, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama, Kanagawa 223-8522, Japan.
| | - Tomoaki Okuda
- Department of Applied Chemistry, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama, Kanagawa 223-8522, Japan.
| | - Daniel Citterio
- Department of Applied Chemistry, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama, Kanagawa 223-8522, Japan.
| | - Yuki Hiruta
- Department of Applied Chemistry, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama, Kanagawa 223-8522, Japan.
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13
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Jacobs JH, McKelvie KH, Nanji S, Marriott RA. Sour Gas Adsorption on Silica Gels. ACS OMEGA 2023; 8:12592-12602. [PMID: 37033864 PMCID: PMC10077463 DOI: 10.1021/acsomega.3c01366] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/28/2023] [Accepted: 03/09/2023] [Indexed: 06/19/2023]
Abstract
One of the essential factors for water adsorption on silica gels is the concentration of silanol groups on the silica surface. However, no systematic investigation on the adsorption of sour gas components, methane (CH4), carbon dioxide (CO2), and hydrogen sulfide (H2S) on silica gels with different textural properties and surface silanol concentrations, has been conducted. Three silica gels of 22, 30, and 60 Å pore sizes, with silanol concentrations of αtotal = 2.516, 2.340, and 2.152 OH nm-2, respectively, were studied in this work. The adsorption data for CH4, CO2, H2S, and H2O at T = 0, 25, and 50 °C on the 22 and 30 Å pore size silica gels were presented, and a comparison of the data for the 60 Å pore size silica gel on the same adsorbates was conducted. All three silica gels showed an adsorption affinity in the order of H2O > H2S > CO2 > CH4. The isosteric heats of adsorption of H2O and H2S had a greater dependence on the silanol concentration than CO2 and CH4. At p < 10 bar, there was no difference in the adsorption per m2 of CH4 between the silica gels (n ads = 1.7 mmol m-2, for all silicas at p = 10 bar), while higher pressures resulted in greater adsorption capacity in the larger pore volume silica gels (at p = 20 bar: n ads = 3.0, 3.3, and 3.4 mmol m-2 for the 22, 30, and 60 Å pore size silicas, respectively). H2S adsorption at low pressures (p < 4 bar) was larger on the samples with larger silanol concentrations (at p = 3 bar: n ads = 6.1, 4.7, and 4.5 mmol m-2 for the 22, 30, and 60 Å pore size silicas, respectively), but above p = 4 bar, the 60 Å pore size silica had a greater adsorption capacity than the 30 Å pore size (at p = 5 bar: n ads = 8.0, 6.0, and 6.2 mmol m-2 for the 22, 30, and 60 Å pore size silicas, respectively).
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14
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Mohanan S, Guan X, Liang M, Karakoti A, Vinu A. Stimuli-Responsive Silica Silanol Conjugates: Strategic Nanoarchitectonics in Targeted Drug Delivery. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2023:e2301113. [PMID: 36967548 DOI: 10.1002/smll.202301113] [Citation(s) in RCA: 9] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/07/2023] [Revised: 02/28/2023] [Indexed: 06/18/2023]
Abstract
The design of novel drug delivery systems is exceptionally critical in disease treatments. Among the existing drug delivery systems, mesoporous silica nanoparticles (MSNs) have shown profuse promise owing to their structural stability, tunable morphologies/sizes, and ability to load different payload chemistry. Significantly, the presence of surface silanol groups enables functionalization with relevant drugs, imaging, and targeting agents, promoting their utility and popularity among researchers. Stimuli-responsive silanol conjugates have been developed as a novel, more effective way to conjugate, deliver, and release therapeutic drugs on demand and precisely to the selected location. Therefore, it is urgent to summarize the current understanding and the surface silanols' role in making MSN a versatile drug delivery platform. This review provides an analytical understanding of the surface silanols, chemistry, identification methods, and their property-performance correlation. The chemistry involved in converting surface silanols to a stimuli-responsive silica delivery system by endogenous/exogenous stimuli, including pH, redox potential, temperature, and hypoxia, is discussed in depth. Different chemistries for converting surface silanols to stimuli-responsive bonds are discussed in the context of drug delivery. The critical discussion is culminated by outlining the challenges in identifying silanols' role and overcoming the limitations in synthesizing stimuli-responsive mesoporous silica-based drug delivery systems.
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Affiliation(s)
- Shan Mohanan
- Global Innovative Centre for Advanced Nanomaterials, The School of Engineering, College of Engineering, Science and Environment, The University of Newcastle, Callaghan, 2308, Australia
| | - Xinwei Guan
- Global Innovative Centre for Advanced Nanomaterials, The School of Engineering, College of Engineering, Science and Environment, The University of Newcastle, Callaghan, 2308, Australia
| | - Mingtao Liang
- School of Biomedical Sciences and Pharmacy, College of Health Medicine and Wellbeing, The University of Newcastle, Callaghan, 2308, Australia
| | - Ajay Karakoti
- Global Innovative Centre for Advanced Nanomaterials, The School of Engineering, College of Engineering, Science and Environment, The University of Newcastle, Callaghan, 2308, Australia
| | - Ajayan Vinu
- Global Innovative Centre for Advanced Nanomaterials, The School of Engineering, College of Engineering, Science and Environment, The University of Newcastle, Callaghan, 2308, Australia
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15
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Surface-bubble-modulated liquid chromatography: an experimental strategy for identification of molecular processes of solute retention in reversed-phase separation systems. ANAL SCI 2023; 39:791-813. [PMID: 36894780 DOI: 10.1007/s44211-023-00291-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2022] [Accepted: 02/07/2023] [Indexed: 03/11/2023]
Abstract
Molecular level understanding of the chemistry at the aqueous/hydrophobe interface is crucial to separation processes in aqueous media, such as reversed-phase liquid chromatography (RPLC) and solid-phase extraction (SPE). Despite significant advances in our knowledge of the solute retention mechanism in these reversed-phase systems, direct observation of the behavior of molecules and ions at the interface in reversed-phase systems still remains a major challenge and experimental probing techniques that provide the spatial information of the distribution of molecules and ions are required. This review addresses surface-bubble-modulated liquid chromatography (SBMLC), which has a stationary gas phase in a column packed with hydrophobic porous materials and enables one to observe the molecular distribution in the heterogeneous reversed-phase systems consisting of the bulk liquid phase, the interfacial liquid layer, and the hydrophobic materials. The distribution coefficients of organic compounds referring to their accumulations onto the interface of alkyl- and phenyl-hexyl-bonded silica particles exposed to water or acetonitrile-water and into the bonded layers from the bulk liquid phase are determined by SBMLC. The experimental data obtained by SBMLC show that the water/hydrophobe interface exhibits an accumulation selectivity for organic compounds, which is quite different from that of the interior of the bonded chain layer, and the overall separation selectivity of the reversed-phase systems is determined by the relative sizes of the aqueous/hydrophobe interface and the hydrophobe. The solvent composition and the thickness of the interfacial liquid layer formed on octadecyl-bonded (C18) silica surfaces are also estimated from the bulk liquid phase volume determined by the ion partition method employing small inorganic ions as probes. It is clarified that various hydrophilic organic compounds as well as inorganic ions recognize the interfacial liquid layer formed on the C18-bonded silica surfaces as being different from the bulk liquid phase. The behavior of some solute compounds exhibiting substantially weak retention in RPLC or the so-called negative adsorption, such as urea, sugars, and inorganic ions, can rationally be interpreted with a partition between the bulk liquid phase and the interfacial liquid layer. The spatial distribution of solute molecules and the structural properties of the solvent layer on the C18-bonded layer determined by the liquid chromatographic methods are discussed in comparison to the results obtained by other research groups using molecular simulation methods.
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16
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Gély CA, Picard-Hagen N, Chassan M, Garrigues JC, Gayrard V, Lacroix MZ. Contribution of Reliable Chromatographic Data in QSAR for Modelling Bisphenol Transport across the Human Placenta Barrier. MOLECULES (BASEL, SWITZERLAND) 2023; 28:molecules28020500. [PMID: 36677565 PMCID: PMC9863378 DOI: 10.3390/molecules28020500] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/05/2022] [Revised: 12/20/2022] [Accepted: 12/22/2022] [Indexed: 01/06/2023]
Abstract
Regulatory measures and public concerns regarding bisphenol A (BPA) have led to its replacement by structural analogues, such as BPAF, BPAP, BPB, BPF, BPP, BPS, and BPZ. However, these alternatives are under surveillance for potential endocrine disruption, particularly during the critical period of fetal development. Despite their structural analogies, these BPs differ greatly in their placental transport efficiency. For predicting the fetal exposure of this important class of emerging contaminants, quantitative structure-activity relationship (QSAR) studies were developed to model and predict the placental clearance indices (CI). The most usual input parameters were molecular descriptors obtained by modelling, but for bisphenols (BPs) with structural similarities or heteroatoms such as sulfur, these descriptors do not contrast greatly. This study evaluated and compared the capacity of QSAR models based either on molecular or chromatographic descriptors or a combination of both to predict the placental passage of BPs. These chromatographic descriptors include both the retention mechanism and the peak shape on columns that reflect specific molecular interactions between solute and stationary and mobile phases and are characteristic of the molecular structure of BPs. The chromatographic peak shape such as the asymmetry and tailing factors had more influence on predicting the placental passage than the usual retention parameters. Furthermore, the QSAR model, having the best prediction capacity, was obtained with the chromatographic descriptors alone and met the criteria of internal and cross validation. These QSAR models are crucial for predicting the fetal exposure of this important class of emerging contaminants.
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Affiliation(s)
- Clémence A. Gély
- ToxAlim (Research Centre in Food Toxicology), National Research Institute for Agriculture, Food and Environment (INRAE), National Veterinay School of Toulouse (ENVT), University of Toulouse, 31076 Toulouse, France
- Therapeutic Innovations and Resistances (INTHERES), National Research Institute for Agriculture, Food and Environment (INRAE), National Veterinay School of Toulouse (ENVT), University of Toulouse, 31076 Toulouse, France
| | - Nicole Picard-Hagen
- ToxAlim (Research Centre in Food Toxicology), National Research Institute for Agriculture, Food and Environment (INRAE), National Veterinay School of Toulouse (ENVT), University of Toulouse, 31076 Toulouse, France
| | - Malika Chassan
- Therapeutic Innovations and Resistances (INTHERES), National Research Institute for Agriculture, Food and Environment (INRAE), National Veterinay School of Toulouse (ENVT), University of Toulouse, 31076 Toulouse, France
| | - Jean-Christophe Garrigues
- Molecular Interactions and Chemical and Photochemical Reactivity Laboratory (IMRCP), University of Toulouse, 31062 Toulouse, France
| | - Véronique Gayrard
- ToxAlim (Research Centre in Food Toxicology), National Research Institute for Agriculture, Food and Environment (INRAE), National Veterinay School of Toulouse (ENVT), University of Toulouse, 31076 Toulouse, France
| | - Marlène Z. Lacroix
- Therapeutic Innovations and Resistances (INTHERES), National Research Institute for Agriculture, Food and Environment (INRAE), National Veterinay School of Toulouse (ENVT), University of Toulouse, 31076 Toulouse, France
- Correspondence:
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17
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Arima J, Sakate Y, Monden K, Kobayashi H, Nishi M, Shimizu K. Silica adsorption tag derived from the silica polycondensation protein glassin for the immobilization of soluble proteins. J Biosci Bioeng 2022; 134:477-483. [PMID: 36192321 DOI: 10.1016/j.jbiosc.2022.09.001] [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: 04/10/2022] [Revised: 09/02/2022] [Accepted: 09/04/2022] [Indexed: 12/13/2022]
Abstract
Glassin is a water-soluble protein from the siliceous skeleton of a marine sponge that adsorbs tightly to silica at pH 7.0-9.0 and accelerates silica particle formation from silicic acid. Glassin comprises three distinct domains: a His and Asp-rich (HD) domain, a Pro-rich (P) domain, and a His and Thr-rich (HT) domain. Here, we investigated the roles of these three domains in silica adsorption by using glutathione S-transferase (GST) fused with glassin or with each domain. GST fused with the HD domain exhibited tight adsorption, equivalent to that of GST fused with the full-length glassin sequence at values above 7.0. The apparent Kd values for the binding of full-length glassin and HD to fumed silica at pH 7.0 were 20.8 and 22.7 nM, respectively, indicating that this domain greatly contributes to the silica adsorption ability of glassin. In addition, no internal cleavage was observed in the HD domain, whereas GST fused with the full-length glassin sequence exhibited internal cleavage. The HD domain adsorbed on silica did not dissociate even at pH 6.0. Given these findings, we concluded that the HD domain has potential as a tag for the immobilization of soluble proteins.
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Affiliation(s)
- Jiro Arima
- Department of Agricultural, Life and Environmental Sciences, Faculty of Agriculture, Tottori University, 4-101 Koyama-Minami, Tottori 680-8553, Japan.
| | - Yuto Sakate
- Department of Agricultural Science, Graduate School of Sustainability Science, Tottori University, 4-101 Koyama-Minami, Tottori 680-8553, Japan
| | - Keigo Monden
- Department of Agricultural, Life and Environmental Sciences, Faculty of Agriculture, Tottori University, 4-101 Koyama-Minami, Tottori 680-8553, Japan
| | - Hiroki Kobayashi
- Department of Agricultural Science, Graduate School of Sustainability Science, Tottori University, 4-101 Koyama-Minami, Tottori 680-8553, Japan
| | - Michika Nishi
- Department of Agricultural Science, Graduate School of Sustainability Science, Tottori University, 4-101 Koyama-Minami, Tottori 680-8553, Japan
| | - Katsuhiko Shimizu
- Platform for Community-based Research and Education, Tottori University, Tottori 680-8550, Japan
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18
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MacLeod R, Chan FV, Yuan H, Ye X, Sin YJA, Vitelli TM, Cucu T, Leung A, Baljak I, Osinski S, Fu Y, Jung GID, Amar A, DeAngelis PL, Hellman U, Cowman MK. Selective isolation of hyaluronan by solid phase adsorption to silica. Anal Biochem 2022; 652:114769. [PMID: 35660507 PMCID: PMC9589902 DOI: 10.1016/j.ab.2022.114769] [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: 12/05/2021] [Revised: 04/28/2022] [Accepted: 05/27/2022] [Indexed: 11/01/2022]
Abstract
A solid phase adsorption method for selective isolation of hyaluronan (HA) from biological samples is presented. Following enzymatic degradation of protein, HA can be separated from sulfated glycosaminoglycans, other unsulfated glycosaminoglycans, nucleic acids, and proteolytic fragments by adsorption to amorphous silica at specific salt concentrations. The adsorbed HA can be released from silica using neutral and basic aqueous solutions. HA ranging in size from ∼9 kDa to MDa polymers has been purified by this method from human serum and conditioned medium of cultured cells.
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Affiliation(s)
- Rebecca MacLeod
- Department of Biomedical Engineering, Tandon School of Engineering, New York University, 433 First Avenue, 9thfloor, New York, NY, 10010, USA.
| | - Fok Vun Chan
- Echelon Biosciences Inc., 675 Arapeen Drive, Suite 302, Salt Lake City, UT, 84108, USA.
| | - Han Yuan
- Department of Chemical and Biomolecular Engineering, Tandon School of Engineering, New York University, 6 Metrotech Center, Brooklyn, NY, 11201, USA.
| | - Xin Ye
- Department of Chemical and Biomolecular Engineering, Tandon School of Engineering, New York University, 6 Metrotech Center, Brooklyn, NY, 11201, USA.
| | - Yun Jin Ashley Sin
- Department of Biomedical Engineering, Tandon School of Engineering, New York University, 433 First Avenue, 9thfloor, New York, NY, 10010, USA.
| | - Teraesa M Vitelli
- Department of Biomedical Engineering, Tandon School of Engineering, New York University, 433 First Avenue, 9thfloor, New York, NY, 10010, USA.
| | - Tudor Cucu
- Department of Chemical and Biomolecular Engineering, Tandon School of Engineering, New York University, 6 Metrotech Center, Brooklyn, NY, 11201, USA.
| | - Annie Leung
- Department of Chemical and Biomolecular Engineering, Tandon School of Engineering, New York University, 6 Metrotech Center, Brooklyn, NY, 11201, USA.
| | - Irene Baljak
- Department of Biomedical Engineering, Tandon School of Engineering, New York University, 433 First Avenue, 9thfloor, New York, NY, 10010, USA.
| | - Samantha Osinski
- Department of Chemical and Biomolecular Engineering, Tandon School of Engineering, New York University, 6 Metrotech Center, Brooklyn, NY, 11201, USA.
| | - Yuhong Fu
- Department of Chemical and Biomolecular Engineering, Tandon School of Engineering, New York University, 6 Metrotech Center, Brooklyn, NY, 11201, USA.
| | - Gyu Ik Daniel Jung
- Department of Chemical and Biomolecular Engineering, Tandon School of Engineering, New York University, 6 Metrotech Center, Brooklyn, NY, 11201, USA.
| | - Anant Amar
- Department of Chemical and Biomolecular Engineering, Tandon School of Engineering, New York University, 6 Metrotech Center, Brooklyn, NY, 11201, USA.
| | - Paul L DeAngelis
- Department of Biochemistry and Molecular Biology, University of Oklahoma Health Sciences Center, 940 Stanton L. Young Blvd., Oklahoma, OK, 73104, USA.
| | - Urban Hellman
- Department of Public Health and Clinical Medicine, Umeå University, SE-901 87, Umeå, Sweden.
| | - Mary K Cowman
- Department of Biomedical Engineering, Tandon School of Engineering, New York University, 433 First Avenue, 9thfloor, New York, NY, 10010, USA; Department of Chemical and Biomolecular Engineering, Tandon School of Engineering, New York University, 6 Metrotech Center, Brooklyn, NY, 11201, USA.
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19
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Quantitative evaluation of reversed-phase packing material based on calcium carbonate microspheres modified with an alternating copolymer. J Chromatogr A 2022; 1677:463294. [PMID: 35809518 DOI: 10.1016/j.chroma.2022.463294] [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: 01/08/2022] [Revised: 06/27/2022] [Accepted: 06/28/2022] [Indexed: 11/24/2022]
Abstract
Considering the vulnerability of silica gel to alkaline mobile phases, a highly alkaline stable stationary phase for HPLC is required to separate basic compounds with high separation efficiency. To address this issue, we have developed a high alkaline stable packing material (CaCO3-PMAcO) based on mesoporous calcium carbonate microspheres modified with poly(maleic acid-alt-1-octadecene). In this study, we report further investigation of the separation performance of CaCO3-PMAcO column by systematically evaluating the effects of particle size and chromatographic conditions. Based on the theory of the van Deemter equation, the separation efficiency was related to the size of CaCO3-PMAcO particles (2.9 - 5.7 µm). The evaluation of thermodynamics of retention by changing the column temperature from 20 °C to 45 °C implied that the retention mode was dominated by hydrophobic interaction associated with the exothermic enthalpy changes (-11.1 to -12.5 kJ/mol). The results of column selectivity tests revealed that the CaCO3-PMAcO column had hydrophobic selectivity comparable to C18 silica gel columns (αP/B; CaCO3-PMAcO column: 1.53, C18 column: 1.69), and higher shape/steric selectivity (αTri/Ter; CaCO3-PMAcO column: 1.56, C18 column: 0.955). In practice, the CaCO3-PMAcO column could be applied to the separation of not only alkylbenzenes and polycyclic aromatic hydrocarbons, but also to basic tricyclic antidepressants by using an alkaline mobile phase (pH 12).
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20
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Farajzadeh MA, Fazli N, Pezhhanfar S, Afshar Mogaddam MR. Combination of a dispersive solid phase extraction method based on octadecylamine modified magnetic nanoparticles with dispersive liquid-liquid microextraction for the extraction and preconcentration of pesticides. ANALYTICAL METHODS : ADVANCING METHODS AND APPLICATIONS 2022; 14:2376-2388. [PMID: 35666192 DOI: 10.1039/d2ay00404f] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
In the present work, a new and efficient sorbent has been prepared using the co-precipitation method for magnetic dispersive solid phase extraction followed by dispersive liquid-liquid microextraction. This method was used for the extraction and preconcentration of some widely-used pesticides (chlorpyrifos, haloxyfop-R-methyl, oxadiazon, diniconazole, clodinafop-propargyl, fenpropathrin, and fenoxaprop-P-ethyl) from fruit juices prior to their determination by gas chromatography-flame ionization detection. The sorbent was prepared by octadecylamine co-precipitation with Fe3O4. In the first step, mg amount of the magnetic sorbent was spread into an aqueous sample solution including the selected analytes and vortexed. Then the analytes were eluted with acetonitrile from the surface of the nanoparticles separated with an external magnetic field from the aqueous solution. In the second step, the obtained eluent was mixed with an extraction solvent (chloroform) at the μL-level and rapidly injected into deionized water. After centrifugation, an aliquot of the sedimented phase was injected into the separation system. Experimental parameters which control the performance of both steps were investigated and optimized. Using optimum extraction conditions, the proposed method provided low limits of detection (0.23-0.41 μg L-1) and quantification (0.81-1.3 μg L-1), high enrichment factors (353-443), acceptable extraction recoveries (70-88%), and satisfactory relative standard deviations (≤6%) for intra- (n = 6) and inter-day (n = 4) precisions at a concentration of 30 μg L-1 of each pesticide.
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Affiliation(s)
- Mir Ali Farajzadeh
- Department of Analytical Chemistry, Faculty of Chemistry, University of Tabriz, Tabriz, Iran.
- Engineering Faculty, Near East University, 99138 Nicosia, North Cyprus, Mersin 10, Turkey
| | - Nasim Fazli
- Department of Analytical Chemistry, Faculty of Chemistry, University of Tabriz, Tabriz, Iran.
| | - Sakha Pezhhanfar
- Department of Analytical Chemistry, Faculty of Chemistry, University of Tabriz, Tabriz, Iran.
| | - Mohammad Reza Afshar Mogaddam
- Pharmaceutical Analysis Research Center and Faculty of Pharmacy, Tabriz University of Medical Sciences, Tabriz, Iran
- Food and Drug Safety Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
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21
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Gogoi H, Banerjee S, Datta A. Photoluminescent silica nanostructures and nanohybrids. Chemphyschem 2022; 23:e202200280. [PMID: 35686692 DOI: 10.1002/cphc.202200280] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2022] [Revised: 06/02/2022] [Indexed: 11/06/2022]
Abstract
The complicated photophysics of wide variety of defects existing in silica (SiO2) layer of nanometer thickness determines wide spread photoluminescence bands of Si/SiO2 based system as well as SiO2 nanoparticles (NPs) for their applications in photovoltaic and optoelectronic devices. This review attempts to summarize different photophysical processes in pure SiO2 NPs. Moreover, these NPs also act as scaffolds for various guest molecules to perform their specific functions. Guest fluorophore molecules when trapped inside pores of SiO2 NPs exhibit a different photodynamics than free state, which opens up several important applications of hybrid SiO2 NPs in artificial photosynthesis, sensing, biology and optical fiber.
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Affiliation(s)
- Hemen Gogoi
- Indian Institute of Technology Bombay, Chemistry, Department of Chemistry, IIT Bombay, Powai, 400076, Mumbai, INDIA
| | - Subhasree Banerjee
- Panchmura Mahavidyalaya, Chemistry, Department of Chemistry Panchmura Mahavidyalaya Bankura, West Bengal 722156, Ind, 722156, Bankura, INDIA
| | - Anindya Datta
- Indian Institute of Technology Bombay, Department of Chemistry, Powai, 400076, Mumbai, INDIA
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22
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Sobczak Ł, Kołodziej D, Goryński K. Modifying current thin-film microextraction (TFME) solutions for analyzing prohibited substances: Evaluating new coatings using liquid chromatography. J Pharm Anal 2022; 12:470-480. [PMID: 35811627 PMCID: PMC9257446 DOI: 10.1016/j.jpha.2021.12.007] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2021] [Revised: 12/30/2021] [Accepted: 12/31/2021] [Indexed: 11/01/2022] Open
Abstract
For identifying and quantifying prohibited substances, solid-phase microextraction (SPME) continues to arouse interest as a sample preparation method. However, the practical implementation of this method in routine laboratory testing is currently hindered by the limited number of coatings compatible with the ubiquitous high-performance liquid chromatography (HPLC) systems. Only octadecyl (C18) and polydimethylsiloxane/divinylbenzene ligands are currently marketed for this purpose. To address this situation, the present study evaluated 12 HPLC-compatible coatings, including several chemistries not currently used in this application. The stationary phases of SPME devices in the geometry of thin film-coated blades were prepared by applying silica particles bonded with various functional ligands (C18, octyl, phenyl-hexyl, 3-cyanopropyl, benzenesulfonic acid, and selected combinations of these), as well as unbonded silica, to a metal support. Most of these chemistries have not been previously used as microextraction coatings. The 48 most commonly misused substances were selected to assess the extraction efficacy of each coating, and eight desorption solvent compositions were used to optimize the desorption conditions. All samples were analyzed using an HPLC system coupled with triple quadrupole tandem mass spectrometry. This evaluation enables selection of the best-performing coatings for quantifying prohibited substances and investigates the relationship between extraction efficacy and the physicochemical characteristics of the analytes. Ultimately, using the most suitable coatings is essential for trace-level analysis of chemically diverse prohibited substances.
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23
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Abstract
Ionic liquids (ILs) are non-molecular solvents; specifically, molten salts with low melting points, often below 100 °C and even below room temperature, thus allowing these solvents to remain liquid [...]
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24
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Lossmann K, Hecht R, Saame J, Heering A, Leito I, Kipper K. Retention mechanisms of acidic and basic analytes on the Pentafluorophenyl stationary phase using fluorinated eluent additives. J Chromatogr A 2022; 1666:462850. [DOI: 10.1016/j.chroma.2022.462850] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2021] [Revised: 01/20/2022] [Accepted: 01/23/2022] [Indexed: 11/17/2022]
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25
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Trachta M, Rubes M, Bludský O. Towards accurate ab initio modeling of siliceous zeolite structures. J Chem Phys 2022; 156:094708. [DOI: 10.1063/5.0083191] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Affiliation(s)
- Michal Trachta
- Institute of Organic Chemistry and Biochemistry, Prague, Czech Republic
| | | | - Ota Bludský
- Molecular Modelling, Institute of Organic Chemistry and Biochemistry Czech Academy of Sciences, Czech Republic
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26
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Dembek M, Bocian S, Buszewski B. Solvent Influence on Zeta Potential of Stationary Phase-Mobile Phase Interface. Molecules 2022; 27:molecules27030968. [PMID: 35164234 PMCID: PMC8839144 DOI: 10.3390/molecules27030968] [Citation(s) in RCA: 17] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2021] [Revised: 01/07/2022] [Accepted: 01/27/2022] [Indexed: 11/29/2022] Open
Abstract
Zeta potential is a surface characteristic formed on the solid surface and liquid interface. It is an interesting way to describe the surface properties of materials; thus, a series of four homemade polar embedded stationary phases that contain phosphate groups incorporated into hydrophobic ligands were investigated according to surface zeta potential. Measurements were carried out using Zetasizer Nano ZS for the stationary phases suspensions prepared in various solvent and solvent binary mixtures. The negative zeta potential values were obtained for most cases due to negatively charged residual silanols and phosphate groups. However, in some solvents: tetrahydrofuran, isopropanol, and toluene zeta potential are positive. Additionally, it was observed that the zeta potential seems to be independent of the type of silica gel used for the stationary phase synthesis.
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Affiliation(s)
| | - Szymon Bocian
- Correspondence: ; Tel.: +48-56-611-4308; Fax: +48-56-611-4837
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Mileo PGM, Rogge SMJ, Houlleberghs M, Breynaert E, Martens JA, Van Speybroeck V. Interfacial study of clathrates confined in reversed silica pores. JOURNAL OF MATERIALS CHEMISTRY. A 2021; 9:21835-21844. [PMID: 34707871 PMCID: PMC8491980 DOI: 10.1039/d1ta03105h] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/13/2021] [Accepted: 08/22/2021] [Indexed: 05/08/2023]
Abstract
Storing methane in clathrates is one of the most promising alternatives for transporting natural gas (NG) as it offers similar gas densities to liquefied and compressed NG while offering lower safety risks. However, the practical use of clathrates is limited given the extremely low temperatures and high pressures necessary to form these structures. Therefore, it has been suggested to confine clathrates in nanoporous materials, as this can facilitate clathrate's formation conditions while preserving its CH4 volumetric storage. Yet, the choice of nanoporous materials to be employed as the clathrate growing platform is still rather arbitrary. Herein, we tackle this challenge in a systematic way by computationally exploring the stability of clathrates confined in alkyl-grafted silica materials with different pore sizes, ligand densities and ligand types. Based on our findings, we are able to propose key design criteria for nanoporous materials favoring the stability of a neighbouring clathrate phase, namely large pore sizes, high ligand densities, and smooth pore walls. We hope that the atomistic insight provided in this work will guide and facilitate the development of new nanomaterials designed to promote the formation of clathrates.
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Affiliation(s)
- Paulo G M Mileo
- Center for Molecular Modeling (CMM), Ghent University Technologiepark 46 B-9052 Zwijnaarde Belgium
| | - Sven M J Rogge
- Center for Molecular Modeling (CMM), Ghent University Technologiepark 46 B-9052 Zwijnaarde Belgium
| | - Maarten Houlleberghs
- Center for Surface Chemistry and Catalysis, Katholieke Universiteit Leuven Celestijnenlaan 200F 3001 Heverlee Belgium
| | - Eric Breynaert
- Center for Surface Chemistry and Catalysis, Katholieke Universiteit Leuven Celestijnenlaan 200F 3001 Heverlee Belgium
| | - Johan A Martens
- Center for Surface Chemistry and Catalysis, Katholieke Universiteit Leuven Celestijnenlaan 200F 3001 Heverlee Belgium
| | - Veronique Van Speybroeck
- Center for Molecular Modeling (CMM), Ghent University Technologiepark 46 B-9052 Zwijnaarde Belgium
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Timchenko YV, Stavrianidi AN, Smolenkov AD, Pirogov AV, Shpigun OA. A novel simple and sensitive approach for determination of 1,1-dimethylhydrazine in aqueous samples by high performance liquid chromatography with ultraviolet and tandem mass spectrometric detection after derivatization with unsubstituted aromatic aldehydes. CHEMOSPHERE 2021; 280:130747. [PMID: 33975236 DOI: 10.1016/j.chemosphere.2021.130747] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/19/2021] [Revised: 04/27/2021] [Accepted: 04/28/2021] [Indexed: 06/12/2023]
Abstract
In this work, simple, rapid and highly sensitive method of hazardous chemical 1,1-dimethylhydrazine (unsymmetrical dimethylhydrazine, UDMH) determination based on pre-column derivatization with unsubstituted aromatic aldehydes and reversed-phase high performance liquid chromatography-ultraviolet-tandem mass spectrometry (RP HPLC-UV-MS/MS) has been developed. Along with benzaldehyde, commercially available aromatic aldehydes, namely: 2-naphthaldehyde, 2-pyridinecarboxaldehyde, and 2-quinolinecarboxaldehyde, were used as derivatizing reagents in the analysis of hydrazines for the first time. The reactions were studied in a wide pH range by varying reaction time and other conditions. A slightly alkaline pH 9 was shown to be optimal for the derivatization of UDMH by aromatic aldehydes. The quantitative yield of derivatization products under the established conditions was confirmed by HPLC analysis with amperometric detection. For all studied reagents, wide linear ranges of concentrations (0.01-1000 μg/L) in natural water samples were observed. The limits of detection for UDMH in natural water were in the 3.7-130 ng/L range. 2-Quinolinecarboxaldehyde was selected as the most appropriate reagent for HPLC-UV-MS/MS determination of UDMH. In case of using this reagent, the accuracy was in the range of 97-102%, and precision, expressed as RSD was less than 8%. The developed approach does not require laborious stages of pre-concentration and isolation of UDMH from natural water components.
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Affiliation(s)
- Yury V Timchenko
- Department of Chemistry, Lomonosov Moscow State University, Leninskie Gory, 1-3, GSP-1, Moscow, 119991, Russia.
| | - Andrey N Stavrianidi
- Department of Chemistry, Lomonosov Moscow State University, Leninskie Gory, 1-3, GSP-1, Moscow, 119991, Russia; A.N. Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Leninsky Prospect, 31, GSP-1, Moscow, 119071, Russia
| | - Alexander D Smolenkov
- Department of Chemistry, Lomonosov Moscow State University, Leninskie Gory, 1-3, GSP-1, Moscow, 119991, Russia
| | - Andrey V Pirogov
- Department of Chemistry, Lomonosov Moscow State University, Leninskie Gory, 1-3, GSP-1, Moscow, 119991, Russia
| | - Oleg A Shpigun
- Department of Chemistry, Lomonosov Moscow State University, Leninskie Gory, 1-3, GSP-1, Moscow, 119991, Russia
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Wang Y, Hao Z, Pan L. Evaluation of multiple hydrophilic interaction chromatography columns and surrogate matrix for arginine quantification in saliva by high-resolution mass spectrometry. J Sep Sci 2021; 44:3580-3593. [PMID: 34405941 DOI: 10.1002/jssc.202100361] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2021] [Revised: 08/15/2021] [Accepted: 08/15/2021] [Indexed: 02/05/2023]
Abstract
Arginine, a pivotal ingredient in many biochemical synthetic pathways, can be used as a biomarker for many oral care clinical applications. It is still a challenge to develop a sensitive and reliable chromatographic method to quantify arginine as a biomarker in saliva, with or without arginine product pretreatment. The current method solved two critical issues for arginine quantitation in human saliva. The first issue was how to optimize arginine peak shape. A hydrophilic interaction chromatography method based on the column selection, pH and pKa relationship, mobile phase ionic strength, organic solvent consideration, and temperature effects was developed. An optimized chromatographic condition for arginine quantitation in the saliva matrix was obtained. The second issue was how to build confidence in the use of a simple surrogate matrix methodology to replace the more complex traditional standard addition methodology. The surrogate matrix methodology we developed is applicable to the measurement of arginine as a potential non-invasive biomarker in human saliva. The method detection and quantification limit reached 2 and 6 ng/mL. The tailing factor was within the 0.9-1.1 range even though arginine had three pKa values at 2.18, 9.09, and 13.2.
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Affiliation(s)
- Yu Wang
- Cross Category Research and Innovation Department, Technology Center, Colgate-Palmolive Company, Piscataway, New Jersey, USA
| | - Zhigang Hao
- Cross Category Research and Innovation Department, Technology Center, Colgate-Palmolive Company, Piscataway, New Jersey, USA
| | - Long Pan
- Cross Category Research and Innovation Department, Technology Center, Colgate-Palmolive Company, Piscataway, New Jersey, USA
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30
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Construction of β-cyclodextrin linked glycidyl methacrylate polymers for stereoselective separation of chiral drug. JOURNAL OF POLYMER RESEARCH 2021. [DOI: 10.1007/s10965-021-02634-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Birdsall RE, Kellett J, Ippoliti S, Ranbaduge N, Lauber MA, Yu YQ, Chen W. Reducing metal-ion mediated adsorption of acidic peptides in RPLC-based assays using hybrid silica chromatographic surfaces. J Chromatogr B Analyt Technol Biomed Life Sci 2021; 1179:122700. [PMID: 34329890 DOI: 10.1016/j.jchromb.2021.122700] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2021] [Revised: 03/05/2021] [Accepted: 04/02/2021] [Indexed: 10/21/2022]
Abstract
In this study we evaluate column hardware exhibiting a novel hybrid silica surface in its ability to mitigate metal-induced adsorption artifacts such as chromatographic peak tailing for acidic amino acid residue containing peptides. Using a conventional reversed-phase liquid chromatography (RPLC)-based method, chromatographic performance of a peptide map was compared using a traditional stainless-steel column and an equivalent column bearing a novel hybrid silica surface. Tailing factors for six peptides containing acidic amino acid residues (Tf ≥ 1.50) were observed to be reduced up to 80% to a nominal value Tf ≤ 1.2 with R.S.D. % ≤ 4%. Furthermore, recovery for two of the identified peptides exhibited increased recovery in addition to reduced peak tailing when using the column bearing the hybrid silica surface. Performance was unaffected for peaks where there were no implications of metal induced effects. Collectively, this study demonstrates that the novel hybrid silica surface can effectively reduce peak tailing for acidic residue containing peptides.
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Affiliation(s)
- Robert E Birdsall
- Waters Corporation, 34 Maple Street, Milford, MA 01757, United States.
| | - Jacob Kellett
- Waters Corporation, 34 Maple Street, Milford, MA 01757, United States.
| | - Samantha Ippoliti
- Waters Corporation, 34 Maple Street, Milford, MA 01757, United States.
| | - Nilini Ranbaduge
- Waters Corporation, 34 Maple Street, Milford, MA 01757, United States.
| | - Matthew A Lauber
- Waters Corporation, 34 Maple Street, Milford, MA 01757, United States.
| | - Ying Qing Yu
- Waters Corporation, 34 Maple Street, Milford, MA 01757, United States.
| | - Weibin Chen
- Waters Corporation, 34 Maple Street, Milford, MA 01757, United States.
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The adsorption of methanol on reversed phase stationary phases in supercritical fluid chromatography. J Chromatogr A 2021; 1653:462386. [PMID: 34274884 DOI: 10.1016/j.chroma.2021.462386] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2021] [Revised: 06/30/2021] [Accepted: 07/01/2021] [Indexed: 11/23/2022]
Abstract
The surface excess isotherms of methanol from carbon dioxide on reversed phase stationary phases under two different operational conditions - which can be considered subcritical and supercritical conditions depending on the molar fraction of CO2 in methanol - were determined using the minor disturbance peak method. The shapes of the surface excess isotherms were very similar in subcritical and supercritical conditions for the same column. To verify the influence of the sample solvent on the separation efficiency, two solvents methanol and heptane were used as sample solvents for alkylbenzene samples for the separation on the studied columns with pure carbon dioxide mobile phase. The separation efficiency was determined by calculating the number of theoretical plates. On the embedded amide stationary phase with methanol as a sample solvent the efficiency has increased due to the displacement effect of methanol on the solutes which are retained less than methanol. Then the efficiency for the rest of solutes, which coincide with the elution of the methanol peak tail has decreased as a result of the tag-along effect. The surface adsorbent heterogeneity has been discussed; the bonded ligands on the stationary phase surface demonstrated adsorption a big amount of CO2, while methanol could adsorb with small amount on the residual silanols on the surface of stationary phase and the embedded (amide) polar group in the bonded phase.
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Ohmuro S, Ishizaki R, Tsukamoto M, Nasu S, Yasui T, Takada K, Yuchi A. Effects of Residual Silanol on Solid Phase Extraction of Organic Compounds to Octadecylsilyl Silica. ANAL SCI 2021; 37:879-885. [PMID: 33132232 DOI: 10.2116/analsci.20p314] [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: 11/23/2022]
Abstract
Batchwise equilibrium study was carried out on the retention of nonpolar and polar organic compounds to octadecylsilyl (ODS) silicas of different properties at atmospheric pressure. While nonpolar compounds were retained only by distribution on the ODS phase, polar compounds were retained by both distribution and Langmuir-type adsorption on residual silanol. Retention on ODS silica with more silanol proceeded at a higher rate than retention on ODS silica with less silanol and was reversible on this solid phase extraction time-scale. An increase in surface density of ODS decreased the distribution constant, due to a decrease in fraction of ODS functioning as an extracting medium and also decreased the saturated adsorption amount, due to reductions of the residual silanol and the functioning ODS. The ODS silica with the lowest ODS density showed a distribution constant 31 times higher and a saturated adsorption amount 27 times higher than the ODS silica with the highest ODS density. On the other hand, because the interaction between the organic part and the ODS group introduced at higher density is strengthened, the adsorption constant is increased by about 5 times compared to the low density ODS silica. The electronic effects of substituents to nitrogen- and oxygen-containing compounds on retention were discussed. In conclusion, ODS silica with an appreciable amount of residual silanol is superior for solid phase extraction.
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Affiliation(s)
- Satoshi Ohmuro
- Graduate School of Engineering, Nagoya Institute of Technology
| | - Ryo Ishizaki
- Graduate School of Engineering, Nagoya Institute of Technology
| | | | - Shizuka Nasu
- Graduate School of Engineering, Nagoya Institute of Technology
| | - Takashi Yasui
- Graduate School of Engineering, Nagoya Institute of Technology
| | - Kazutake Takada
- Graduate School of Engineering, Nagoya Institute of Technology
| | - Akio Yuchi
- Graduate School of Engineering, Nagoya Institute of Technology
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Static vs. Dynamic Electrostatic Repulsion Reversed Phase Liquid Chromatography: Solutions for Pharmaceutical and Biopharmaceutical Basic Compounds. SEPARATIONS 2021. [DOI: 10.3390/separations8050059] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Many efforts have been made to separate basic compounds, which are challenging to resolve in reversed phase liquid chromatography. In this process, they are strongly retained and the peak shape undergoes significant distortion. The principal origin of this has been identified with the non-negligible interaction with residual deprotonated silanols. Consequently, all solutions that efficiently shield silanols are being sought. This review is an upgrade on the use of the electrostatic repulsion reversed phase (ERRP) approach: retention of bases, in protonated form, can be achieved by modulating the charge repulsion caused by the presence of positive charges in the chromatographic system. This study successfully (i) introduced fixed positive charges in the structure of stationary phases, (ii) used cationic and hydrophobic additives in the mobile phase, and (iii) used the ERRP-like approach employed at the preparative level for peptide purification.
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Gallo M, Serpella L, Leone F, Manna L, Banchero M, Ronchetti S, Onida B. Piroxicam Loading onto Mesoporous Silicas by Supercritical CO 2 Impregnation. Molecules 2021; 26:molecules26092500. [PMID: 33922927 PMCID: PMC8123285 DOI: 10.3390/molecules26092500] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2021] [Revised: 04/16/2021] [Accepted: 04/22/2021] [Indexed: 11/16/2022] Open
Abstract
Piroxicam (PRX) is a commonly prescribed nonsteroidal anti-inflammatory drug. Its efficacy, however, is partially limited by its low water solubility. In recent years, different studies have tackled this problem and have suggested delivering PRX through solid dispersions. All these strategies, however, involve the use of potentially harmful solvents for the loading procedure. Since piroxicam is soluble in supercritical CO2 (scCO2), the present study aims, for the first time, to adsorb PRX onto mesoporous silica using scCO2, which is known to be a safer and greener technique compared to the organic solvent-based ones. For comparison, PRX is also loaded by adsorption from solution and incipient wetness impregnation using ethanol as solvent. Two different commercial mesoporous silicas are used (SBA-15 and Grace Syloid® XDP), which differ in porosity order and surface silanol population. Physico-chemical analyses show that the most promising results are obtained through scCO2, which yields the amorphization of PRX, whereas some crystallization occurs in the case of adsorption from solution and IWI. The highest loading of PRX by scCO2 is obtained in SBA-15 (15 wt.%), where molecule distribution appears homogeneous, with very limited pore blocking.
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36
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Koreshkova AN, Gupta V, Peristyy A, Hasan CK, Nesterenko PN, Paull B. Recent advances and applications of synthetic diamonds in solid-phase extraction and high-performance liquid chromatography. J Chromatogr A 2021; 1640:461936. [PMID: 33548824 DOI: 10.1016/j.chroma.2021.461936] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2020] [Revised: 01/18/2021] [Accepted: 01/19/2021] [Indexed: 12/20/2022]
Abstract
Since the advent of diamond-based adsorbents in the late 1960s, the interest in their use for solid-phase extraction (SPE) and high-performance liquid chromatography (HPLC) has steadily increased. This is primarily due to their unique properties, such as extreme chemical and thermal stability, high mechanical strength and biocompatibility, and complex mixed-mode retention mechanisms. Currently, the most commonly used synthetic diamonds in SPE and HPLC are detonation nanodiamonds (DND), high-pressure high-temperature (HPHT) diamonds, and chemical vapour deposition (CVD) diamonds. These diamonds have been either used as individual particles (in both modified and unmodified forms), or for surface modification, or entrapped within composites and core-shell particles to develop new diamond-based adsorbents. These diamond-based adsorbents have been used for a variety of applications, including streamlined proteome analysis; extraction of anions, cations, actinides, uranium, lanthanides, alkaline earth metals, transition metals, and post-transition metals; and development of reversed-phase, normal phase, hydrophilic interaction, ion chromatography, and mixed-mode liquid chromatography columns, to name but a few. These varied applications of different types of diamonds are typically governed by their specific properties. This review discusses the various surface and bulk properties of DND, HPHT diamonds, and CVD diamonds that facilitate or limit their use in different SPE and HPLC based applications.
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Affiliation(s)
- Aleksandra N Koreshkova
- Australian Centre for Research on Separation Science (ACROSS), School of Natural Sciences, University of Tasmania, Private Bag 75, Hobart, TAS 7001, Australia
| | - Vipul Gupta
- Australian Centre for Research on Separation Science (ACROSS), School of Natural Sciences, University of Tasmania, Private Bag 75, Hobart, TAS 7001, Australia; ARC Centre of Excellence for Electromaterials Science (ACES), School of Natural Sciences, University of Tasmania, Private Bag 75, Hobart, TAS, 7001, Australia
| | - Anton Peristyy
- Australian Centre for Research on Separation Science (ACROSS), School of Natural Sciences, University of Tasmania, Private Bag 75, Hobart, TAS 7001, Australia
| | - Chowdhury K Hasan
- Australian Centre for Research on Separation Science (ACROSS), School of Natural Sciences, University of Tasmania, Private Bag 75, Hobart, TAS 7001, Australia; School of Environment and Life Sciences, Independent University, Bangladesh, Dhaka, Bangladesh
| | - Pavel N Nesterenko
- Chemistry Department, Physical Chemistry Division, Lomonosov Moscow State University, 1-3 Leninskie Gory, 119991, Moscow, Russian Federation
| | - Brett Paull
- Australian Centre for Research on Separation Science (ACROSS), School of Natural Sciences, University of Tasmania, Private Bag 75, Hobart, TAS 7001, Australia; ARC Centre of Excellence for Electromaterials Science (ACES), School of Natural Sciences, University of Tasmania, Private Bag 75, Hobart, TAS, 7001, Australia.
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Pankajkumar-Patel N, Peris-García E, Ruiz-Angel M, García-Alvarez-Coque M. Analysis of tricyclic antidepressants in pharmaceuticals by microemulsion liquid chromatography. Microchem J 2021. [DOI: 10.1016/j.microc.2020.105659] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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38
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Paula MV, Azevedo LAD, Silva IDDL, Vinhas GM, Alves Junior S. Effects of gamma radiation on nanocomposite films of polycaprolactone with modified MCM-48. POLIMEROS 2021. [DOI: 10.1590/0104-1428.20210044] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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39
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Yamaguchi A, Katayama K, Holt SA. In-situ Neutron Reflectometry Study on Adsorption of Glucose Oxidase at Mesoporous Aluminum Oxide Film. ANAL SCI 2020; 36:1331-1336. [PMID: 32536623 DOI: 10.2116/analsci.20p160] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
In the present study, the adsorption of glucose oxidase (GOD) to a mesoporous aluminum oxide (MAO) film was examined with in-situ neutron reflectometry (NR) measurements. The MAO film was deposited on a cover glass slip and a Si disc, and its pore structure was characterized by X-ray reflectometry (XRR) and NR. The Si disc with MAO film was applied for an in-situ NR experiment, and its NR profiles before/after adsorption of GOD were continuously measured with a flow cell. The results indicated that the negatively-charged GOD molecules hardly penetrate into the narrow pore channel (pore diameter = ca. 10 nm) with opposite surface charge.
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Affiliation(s)
| | | | - Stephen A Holt
- Australian Centre for Neutron Scattering, Australian Nuclear Science and Technology Organisation (ANSTO)
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40
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Chen WY, Matulis D, Hu WP, Lai YF, Wang WH. Studies of the interactions mechanism between DNA and silica surfaces by Isothermal Titration Calorimetry. J Taiwan Inst Chem Eng 2020. [DOI: 10.1016/j.jtice.2020.11.019] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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41
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McCarthy CA, Zemlyanov DY, Crean AM, Taylor LS. Comparison of Drug Release and Adsorption under Supersaturating Conditions for Ordered Mesoporous Silica with Indomethacin or Indomethacin Methyl Ester. Mol Pharm 2020; 17:3062-3074. [PMID: 32633973 DOI: 10.1021/acs.molpharmaceut.0c00489] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Incomplete drug release from mesoporous silica systems has been observed in several studies. This work aims to increase the understanding of this phenomenon by investigating the mechanism of drug-silica interactions and adsorption behavior from supersaturated aqueous solutions of two similar drug molecules with different hydrogen bonding capabilities. Drug-silica interactions between indomethacin or its methyl ester and SBA-15 were investigated using spectroscopic techniques (infrared, fluorescence and X-ray photoelectron) and adsorption experiments. The results demonstrate that the predominant mechanism of interaction of both drugs with silica is hydrogen bonding between drug acceptor carbonyl groups with donor groups on the silica surface. The presence of a drug hydrogen bond donor group did not enhance drug adsorption. No evidence was obtained for drug adsorption through nonspecific hydrophobic interactions. Drug adsorption onto the silica surface was investigated under supersaturating conditions through the generation of adsorption isotherms. Similar adsorption isotherms were observed for each compound when the concentration scale was normalized to the drug amorphous solubility. In other words, the equilibrium between the drug adsorbed on the silica surface and free drug in solution was related to the drug activity in solution. The high tendency of the drug to adsorb when the solution is supersaturated was, in turn, found to limit the extent of drug release during dissolution under nonsink conditions. Thus, adsorption provides an explanation for incomplete drug release.
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Affiliation(s)
- Carol A McCarthy
- SSPC Pharm. Res. Centre, School of Pharmacy, University College Cork, Cork T12 YN60, Ireland
| | - Dmitry Y Zemlyanov
- Birck Nanotechnology Center, Purdue University, West Lafayette 47907, Indiana, United States
| | - Abina M Crean
- SSPC Pharm. Res. Centre, School of Pharmacy, University College Cork, Cork T12 YN60, Ireland
| | - Lynne S Taylor
- Department of Industrial and Physical Pharmacy, College of Pharmacy, Purdue University, West Lafayette 47907, Indiana, United States
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42
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Schnepper MT, Roles J, Hickman JJ. Characterization of Drug-Polymer Adsorption Isotherms in Body-on-a-Chip Systems by Inverse Liquid-Solid Chromatography. ACS Biomater Sci Eng 2020; 6:4462-4475. [PMID: 33455187 DOI: 10.1021/acsbiomaterials.0c00350] [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: 11/28/2022]
Abstract
Body-on-a-chip and human-on-a-chip systems are currently being used to augment and could eventually replace animal models in drug discovery and basic biological research. However, hydrophobic molecules, especially therapeutic compounds, tend to adsorb to the polymer materials used to create these microfluidic platforms, which may distort the dose-response curves that feed into pharmacokinetic/pharmacodynamic (PK/PD) models, which translate preclinical data into predictions of clinical outcomes. Inverse liquid-solid chromatography paired with a numerical optimization based on the Langmuir model of adsorption was used to characterize the adsorption isotherm parameters of drugs to polydimethylsiloxane (PDMS) and polymethylmethacrylate (PMMA), polymers commonly used in these platforms. The adsorption isotherms were then compared against concentration measurements of drugs recirculated in these platforms. This research further illustrates the point that by quantifying drug or drug candidate interactions before system dosing and including this data in the PK/PD models, then polymers used in these platforms need not be limited to "less-adsorbing" materials.
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Affiliation(s)
- Mark T Schnepper
- NanoScience Technology Center, University of Central Florida, 12424 Research Parkway, Suite 400, Orlando, Florida 32826, United States
| | - Jeff Roles
- Hesperos, Inc., 12501 Research Pkwy #100, Orlando, Florida 32826, United States
| | - James J Hickman
- NanoScience Technology Center, University of Central Florida, 12424 Research Parkway, Suite 400, Orlando, Florida 32826, United States.,Hesperos, Inc., 12501 Research Pkwy #100, Orlando, Florida 32826, United States
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Jaglińska K, Polak B, Klimek-Turek A, Pomastowski P, Buszewski B, Dzido TH. Retardation of some drugs in thin-layer chromatographic systems with impregnated silica gel plates with hen's egg white and bovine serum albumin. J Chromatogr A 2020; 1625:461277. [PMID: 32709329 DOI: 10.1016/j.chroma.2020.461277] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2020] [Revised: 05/22/2020] [Accepted: 05/23/2020] [Indexed: 10/24/2022]
Abstract
The influence of impregnation the chromatographic plate adsorbent layer, silica, with hen's egg white albumin (OVA) or bovine serum albumin (BSA) on the retention of some popular medicines (paracetamol, aminophenazone, theophylline, caffeine, acetanilide, ciprofloxacin, tramadol, acetylsalicylic acid, acebutolol) is investigated. The effect of composition and buffer pH of the mobile phase on solute separation selectivity is also studied. The chromatographic systems with and without above mentioned albumins and their influence on investigated drug retention are compared. In general, it has been turned out that retention of tested medicines in systems with the sorbent impregnated with albumin significantly increase relative to those with non-impregnated.
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Affiliation(s)
- Kamila Jaglińska
- Physical Chemistry Department. Medical University of Lublin, 4A Chodźki Street, 20-093 Lublin, Poland.
| | - Beata Polak
- Physical Chemistry Department. Medical University of Lublin, 4A Chodźki Street, 20-093 Lublin, Poland
| | - Anna Klimek-Turek
- Physical Chemistry Department. Medical University of Lublin, 4A Chodźki Street, 20-093 Lublin, Poland
| | - Paweł Pomastowski
- Department of Environmental Chemistry and Bioanalytics, Faculty of Chemistry, Nicolaus Copernicus University in Torun, 87-100 Toruń, Poland; Centre for Modern Interdisciplinary Technologies. Nicolaus Copernicus University in Torun, 4 Wileńska Street, 87-100 Toruń, Poland
| | - Bogusław Buszewski
- Department of Environmental Chemistry and Bioanalytics, Faculty of Chemistry, Nicolaus Copernicus University in Torun, 87-100 Toruń, Poland; Centre for Modern Interdisciplinary Technologies. Nicolaus Copernicus University in Torun, 4 Wileńska Street, 87-100 Toruń, Poland
| | - Tadeusz H Dzido
- Physical Chemistry Department. Medical University of Lublin, 4A Chodźki Street, 20-093 Lublin, Poland
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Hydrophilic Liquid Chromatography versus Reversed-Phase Liquid Chromatography in the Absence and the Presence of 1-Hexyl-3-methylimidazolium Chloride for the Analysis of Basic Compounds. SEPARATIONS 2020. [DOI: 10.3390/separations7020030] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
In reversed-phase liquid chromatography (RPLC), positively charged basic compounds yield broad and asymmetric peaks, as a result of ionic interactions with free silanols that remain on conventional silica-based columns. Diverse solutions have been proposed to mask the silanophilic activity, which is translated to an improved peak shape. In this work, the chromatographic performance of hydrophilic interaction liquid chromatography (HILIC) was evaluated as an alternative to the addition of an ionic liquid (IL) to the aqueous-organic mobile phase used with RPLC columns, for the analysis of eight β-adrenoceptor antagonists. ILs change the behavior of RPLC stationary phases owing to adsorption on their surface. Meanwhile, in HILIC, a layer of adsorbed water is formed on the stationary phase surface. The association of cationic basic compounds with the adsorbed additive ions, hydrophilic partitioning on the HILIC columns, and other interactions, give rise to complex retention mechanisms. The chromatographic behavior was examined in terms of retention, elution strength, selectivity, peak shape and resolution, using acetonitrile-water mobile phases buffered at pH 3. Both chromatographic modes, RPLC with added IL and HILIC, proved to be a viable solution to the problem of poor peak shape for basic compounds.
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45
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Pankajkumar-Patel N, Peris-García E, Ruiz-Angel MJ, García-Alvarez-Coque MC. Comparison of surfactant-mediated liquid chromatographic modes with sodium dodecyl sulphate for the analysis of basic drugs. ANALYTICAL METHODS : ADVANCING METHODS AND APPLICATIONS 2020; 12:2443-2452. [PMID: 32930233 DOI: 10.1039/d0ay00526f] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
In reversed-phase liquid chromatography (RPLC), basic drugs are positively charged at the usual working pH range and interact with free anionic silanols present in conventional silica-based stationary phases. This translates into stronger retention and tailed and broadened peaks. This problem can be resolved by the addition of reagents to the mobile phase that are adsorbed on the stationary phase, avoiding the access of solutes to silanols. Among these additives, surfactants under micellar conditions have provided good silanol suppressing potency through the technique known as micellar liquid chromatography (MLC). The most common example of this is anionic sodium dodecyl sulphate (SDS). When SDS is at moderate concentration in the presence of high organic solvent content, micelles are not formed and the chromatographic mode is known as high submicellar liquid chromatography (HSLC). In contrast, the addition of an oil to an aqueous solution of SDS containing micelles gives rise to microemulsions in a chromatographic mode known as microemulsion liquid chromatography (MELC). A comprehensive comparison of the chromatographic behaviour of a set of basic β-adrenoceptor antagonists analysed by MLC, HSLC and MELC is carried out in this work, in terms of retention, peak shape and organic solvent consumption. The study shows that high submicellar eluents reduce retention and enhance efficiency with respect to conventional RPLC and MLC. Meanwhile, MELC allows reduced analysis times with less organic solvent with respect to HSLC. The narrower and more symmetrical peaks in MLC, HSLC and MELC, with respect to conventional RPLC, reveal the presence of silanol masking.
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Affiliation(s)
- N Pankajkumar-Patel
- Departament de Química Analítica, Universitat de València, c/Dr. Moliner 50, Burjassot, Spain.
| | - E Peris-García
- Departament de Química Analítica, Universitat de València, c/Dr. Moliner 50, Burjassot, Spain.
| | - M J Ruiz-Angel
- Departament de Química Analítica, Universitat de València, c/Dr. Moliner 50, Burjassot, Spain.
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46
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Evaluation of surface energetics of zirconium-containing mesoporous silica using novel universal isotherm model. ADSORPTION 2020. [DOI: 10.1007/s10450-020-00229-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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47
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Zhao WJ, Chen XY, Liu YQ, Li P, Li HJ. Liquid chromatographic separation of alkaloids in herbal medicines: Current status and perspectives. J Sep Sci 2020; 43:1755-1772. [PMID: 32160388 DOI: 10.1002/jssc.202000081] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2020] [Revised: 03/07/2020] [Accepted: 03/08/2020] [Indexed: 12/27/2022]
Abstract
Alkaloids are a widespread group of basic compounds in herbal medicines and have attracted great interest due to various pharmaceutical activities and desirable druggability. Their distinctive structures make chromatographic separation fairly difficult. Peak tailing, poor resolution, and inferior column-to-column reproducibility are common obstacles to overcome. In order to provide a valuable reference, the methodologies and/or strategies on liquid chromatographic separation of alkaloids in herbal medicines proposed from 2012 to 2019 are thoroughly summarized.
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Affiliation(s)
- Wen-Jing Zhao
- State Key Laboratory of Natural Medicines, China Pharmaceutical University, Nanjing, P.R. China
| | - Xu-Yan Chen
- State Key Laboratory of Natural Medicines, China Pharmaceutical University, Nanjing, P.R. China
| | - Yu-Qian Liu
- State Key Laboratory of Natural Medicines, China Pharmaceutical University, Nanjing, P.R. China
| | - Ping Li
- State Key Laboratory of Natural Medicines, China Pharmaceutical University, Nanjing, P.R. China
| | - Hui-Jun Li
- State Key Laboratory of Natural Medicines, China Pharmaceutical University, Nanjing, P.R. China
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48
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Manetto S, Mazzoccanti G, Ciogli A, Villani C, Gasparrini F. Ultra-high performance separation of basic compounds on reversed-phase columns packed with fully/superficially porous silica and hybrid particles by using ultraviolet transparent hydrophobic cationic additives. J Sep Sci 2020; 43:1653-1662. [PMID: 32043722 DOI: 10.1002/jssc.201901333] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2019] [Revised: 02/06/2020] [Indexed: 12/22/2022]
Abstract
The use of the tetrabutylammonium additive was investigated in the ultra-high performance reversed-phase liquid chromatographic elution of basic molecules of pharmaceutical interest. When added to the mobile phase at low pH, the hydrophobic tetrabutylammonium cation interacts with the octadecyl chains and with the residual silanols, thus imparting a positive charge to the stationary phase, modulating retention and improving peak shape of protonated basic solutes. Two sources of additive were tested: a mixture of tetrabutylammonium hydroxide/trifluoroacetic acid and tetrabutylammonium hydrogen sulfate. Retention and peak shape of 11 basic pharmaceutical compounds were evaluated on commercially available ultra-fast columns packed with octadecyl stationary phases (Ascentis Express C18 2.0 µm, Acquity BEH C18 1.7 µm, Titan C18 1.9 µm). All columns benefit from the use of additive, especially tetrabutylammonium hydrogen sulfate, providing very symmetric peaks with reasonable retention times. Focusing on the probe compounds amitriptyline and sertraline, efficiency and asymmetry values were investigated at increasing retention factor. The trend is very different to that obtained in reversed-phase conditions and the effect lies in the complex molecular interaction mechanisms based on hydrophobic and ion exchange interactions as well as electrostatic repulsion.
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Affiliation(s)
- Simone Manetto
- Dipartimento di Chimica e Tecnologie del Farmaco, "Sapienza" Università di Roma, Rome, Italy
| | - Giulia Mazzoccanti
- Dipartimento di Chimica e Tecnologie del Farmaco, "Sapienza" Università di Roma, Rome, Italy
| | - Alessia Ciogli
- Dipartimento di Chimica e Tecnologie del Farmaco, "Sapienza" Università di Roma, Rome, Italy
| | - Claudio Villani
- Dipartimento di Chimica e Tecnologie del Farmaco, "Sapienza" Università di Roma, Rome, Italy
| | - Francesco Gasparrini
- Dipartimento di Chimica e Tecnologie del Farmaco, "Sapienza" Università di Roma, Rome, Italy
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49
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Yang Y, Tian F, Nie D, Liu Y, Qian K, Yu M, Wang A, Zhang Y, Shi X, Gan Y. Rapid transport of germ-mimetic nanoparticles with dual conformational polyethylene glycol chains in biological tissues. SCIENCE ADVANCES 2020; 6:eaay9937. [PMID: 32083187 PMCID: PMC7007268 DOI: 10.1126/sciadv.aay9937] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/04/2019] [Accepted: 11/22/2019] [Indexed: 05/23/2023]
Abstract
Polyethylene glycols (PEGs) can improve the diffusivity of nanoparticles (NPs) in biological hydrogels, while extended PEG chains severely impede cellular uptake of NPs. Inspired by invasive germs with flagellum-driven mucus-penetrating and fimbriae-mediated epithelium-adhering abilities, we developed germ-mimetic NPs (GMNPs) to overcome multiple barriers in mucosal and tumor tissues. In vitro studies and computational simulations revealed that the tip-specific extended PEG chains on GMNP functioned similarly to flagella, facilitating GMNP diffusion (up to 83.0-fold faster than their counterparts). Meanwhile, the packed PEG chains on the bodies of GMNP mediated strong adhesive interactions with cells similarly to the fimbriae, preserving cellular uptake efficiency. The in vivo results proved the superior tumor permeability and improved oral bioavailability provided by the GMNP (21.9-fold over administration of crystalline drugs). These findings offer useful guidelines for the rational design of NPs by manipulating surface polymer conformation to realize multiple functions and to enhance delivery efficacy.
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Affiliation(s)
- Yiwei Yang
- Shanghai Institute of Materia Medica, Chinese Academy of Sciences, No. 501 Haike Road, Shanghai 201203, P. R. China
- University of Chinese Academy of Sciences, No. 19A Yuquan Road, Beijing 100049, P. R. China
| | - Falin Tian
- Laboratory of Theoretical and Computational Nanoscience, Key Laboratory for Nanosystem and Hierarchy Fabrication, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Chinese Academy of Sciences, Beijing 100190, P. R. China
| | - Di Nie
- Shanghai Institute of Materia Medica, Chinese Academy of Sciences, No. 501 Haike Road, Shanghai 201203, P. R. China
- University of Chinese Academy of Sciences, No. 19A Yuquan Road, Beijing 100049, P. R. China
| | - Yuan Liu
- Shanghai Institute of Materia Medica, Chinese Academy of Sciences, No. 501 Haike Road, Shanghai 201203, P. R. China
| | - Kun Qian
- Shanghai Institute of Materia Medica, Chinese Academy of Sciences, No. 501 Haike Road, Shanghai 201203, P. R. China
- University of Chinese Academy of Sciences, No. 19A Yuquan Road, Beijing 100049, P. R. China
| | - Miaorong Yu
- Shanghai Institute of Materia Medica, Chinese Academy of Sciences, No. 501 Haike Road, Shanghai 201203, P. R. China
- University of Chinese Academy of Sciences, No. 19A Yuquan Road, Beijing 100049, P. R. China
| | - Aohua Wang
- Shanghai Institute of Materia Medica, Chinese Academy of Sciences, No. 501 Haike Road, Shanghai 201203, P. R. China
- University of Chinese Academy of Sciences, No. 19A Yuquan Road, Beijing 100049, P. R. China
| | - Yaqi Zhang
- Shanghai Institute of Materia Medica, Chinese Academy of Sciences, No. 501 Haike Road, Shanghai 201203, P. R. China
- University of Chinese Academy of Sciences, No. 19A Yuquan Road, Beijing 100049, P. R. China
| | - Xinghua Shi
- Laboratory of Theoretical and Computational Nanoscience, Key Laboratory for Nanosystem and Hierarchy Fabrication, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Chinese Academy of Sciences, Beijing 100190, P. R. China
- University of Chinese Academy of Sciences, No. 19A Yuquan Road, Beijing 100049, P. R. China
| | - Yong Gan
- Shanghai Institute of Materia Medica, Chinese Academy of Sciences, No. 501 Haike Road, Shanghai 201203, P. R. China
- University of Chinese Academy of Sciences, No. 19A Yuquan Road, Beijing 100049, P. R. China
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50
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De Pra M, Greco G, Krajewski MP, Martin MM, George E, Bartsch N, Steiner F. Effects of titanium contamination caused by iron-free high-performance liquid chromatography systems on peak shape and retention of drugs with chelating properties. J Chromatogr A 2020; 1611:460619. [DOI: 10.1016/j.chroma.2019.460619] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2019] [Revised: 10/09/2019] [Accepted: 10/12/2019] [Indexed: 02/03/2023]
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