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Kitt JP, Bryce DA, Minteer SD, Harris JM. Confocal Raman Microscopy Investigation of Self-Assembly of Hybrid Phospholipid Bilayers within Individual Porous Silica Chromatographic Particles. Anal Chem 2019; 91:7790-7797. [PMID: 31083975 DOI: 10.1021/acs.analchem.9b01359] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Hybrid-supported phospholipid bilayers are a model structure utilized for measurement of molecular interactions that typically occur at cell membranes. These membrane models are prepared by adsorption of a lipid monolayer onto a stable n-alkyl chain layer that is covalently bound to a support surface. Hybrid bilayers have been adapted to chromatographic retention measurements of lipophilicity through the assembly of a phospholipid monolayer onto n-alkane-modified silica surfaces in reversed-phase chromatographic particles. Recent Raman microscopy studies of these particles have shown that the acyl chains of the phospholipid interact with the C18-alkyl chains immobilized on the silica surface, where both lipid and C18 alkyl chains become ordered because of chain interdigitation. Confocal Raman microscopy has also been used to investigate the association of small molecules with hybrid-lipid bilayers in C18 chromatographic silica particles; the partitioning of model solutes compares favorably to that in lipid vesicle membranes with similar changes in acyl-chain structure (disordering) with solute partitioning. The present study seeks information about how these membrane-mimetic bilayers assemble onto the C18-derivatized silica surfaces of reversed-phase chromatographic silica particles. Confocal Raman microscopy is capable of interrogating the time-dependent internal composition and structure within individual silica particles. The Raman scattering data can be resolved into component Raman spectra and corresponding composition vectors that describe the time-dependent changes in intensity of the component spectra. This analysis provides insight into how the structures of both the lipid and C18 alkyl chains of hybrid lipid bilayers evolve during deposition and organization on the internal surfaces of reversed-phase chromatographic silica particles.
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Affiliation(s)
- Jay P Kitt
- Department of Chemistry , University of Utah , 315 South 1400 East , Salt Lake City , Utah 84112-0850 , United States
| | - David A Bryce
- Department of Chemistry , University of Utah , 315 South 1400 East , Salt Lake City , Utah 84112-0850 , United States
| | - Shelley D Minteer
- Department of Chemistry , University of Utah , 315 South 1400 East , Salt Lake City , Utah 84112-0850 , United States
| | - Joel M Harris
- Department of Chemistry , University of Utah , 315 South 1400 East , Salt Lake City , Utah 84112-0850 , United States
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2
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Moravcová D, Planeta J, Wiedmer SK. Silica-based monolithic capillary columns modified by liposomes for characterization of analyte–liposome interactions by capillary liquid chromatography. J Chromatogr A 2013; 1317:159-66. [DOI: 10.1016/j.chroma.2013.08.031] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2013] [Revised: 08/06/2013] [Accepted: 08/09/2013] [Indexed: 01/29/2023]
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3
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Zhang C, Li J, Xu L, Shi ZG. Fast immobilized liposome chromatography based on penetrable silica microspheres for screening and analysis of permeable compounds. J Chromatogr A 2012; 1233:78-84. [DOI: 10.1016/j.chroma.2012.02.013] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2011] [Revised: 02/04/2012] [Accepted: 02/07/2012] [Indexed: 11/26/2022]
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4
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Dąbrowska M, Starek M, Skuciński J. Lipophilicity study of some non-steroidal anti-inflammatory agents and cephalosporin antibiotics: A review. Talanta 2011; 86:35-51. [DOI: 10.1016/j.talanta.2011.09.017] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2011] [Revised: 09/05/2011] [Accepted: 09/12/2011] [Indexed: 02/03/2023]
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5
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Noorizadeh H, Farmany A, Noorizadeh M. pK(a) modelling and prediction of drug molecules through GA-KPLS and L-M ANN. Drug Test Anal 2011; 5:103-9. [PMID: 21500371 DOI: 10.1002/dta.279] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2011] [Revised: 02/16/2011] [Accepted: 02/19/2011] [Indexed: 11/06/2022]
Abstract
Genetic algorithm and partial least square (GA-PLS), kernel PLS (GA-KPLS) and Levenberg- Marquardt artificial neural network (L-M ANN) techniques were used to investigate the correlation between dissociation constant (pK(a) ) and descriptors for 60 drug compounds. The applied internal (leave-group-out cross validation (LGO-CV)) and external (test set) validation methods were used for the predictive power of models. Descriptors of GA-KPLS model were selected as inputs in L-M ANN model. The results indicate that L-M ANN can be used as an alternative modeling tool for quantitative structure-property relationship (QSPR) studies.
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Affiliation(s)
- H Noorizadeh
- Faculty of Science, Islamic Azad University, Ilam Branch, Ilam, Iran.
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6
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Noorizadeh H, Sobhan Ardakani S, Ahmadi T, Mortazavi SS, Noorizadeh M. Application of genetic algorithm-kernel partial least square as a novel non-linear feature selection method: partitioning of drug molecules. Drug Test Anal 2011; 5:89-95. [DOI: 10.1002/dta.275] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2011] [Revised: 02/02/2011] [Accepted: 02/02/2011] [Indexed: 11/12/2022]
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7
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Bucak S, Wang C, Laibinis PE, Hatton TA. Dynamics of supported lipid bilayer deposition from vesicle suspensions. J Colloid Interface Sci 2010; 348:608-14. [DOI: 10.1016/j.jcis.2010.04.087] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2010] [Revised: 04/28/2010] [Accepted: 04/29/2010] [Indexed: 10/19/2022]
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8
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MacKinnon N, Guérin G, Liu B, Gradinaru CC, Rubinstein JL, Macdonald PM. Triggered instability of liposomes bound to hydrophobically modified core-shell PNIPAM hydrogel beads. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2010; 26:1081-1089. [PMID: 19754070 DOI: 10.1021/la902423v] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
The ability to trigger a destabilization of the membrane integrity of liposomes bound to environmentally sensitive hydrophobically modified core-shell hydrogel beads is demonstrated. Hydrogel beads with a core composed of poly(N-isopropylacrylamide) lightly cross-linked with bisacrylamide (BA) (pNIPAM) and a shell composed of NIPAM highly cross-linked with BA and containing varying amounts of acrylic acid (AA) [p(NIPAM-co-AA)] undergo a volume phase transition (VPT) at approximately 32 degrees C, as determined from (1)H magic angle spinning (MAS) NMR, regardless of the AA content of the shell. When the shell was hydrophobically modified with either decylamine or tetradecylamine, binding of extruded large unilamellar vesicles (eLUVs) composed of 1-palmitoyl-2-oleoylphosphatidylcholine (POPC) was quantitative, as determined via fluorescence spectroscopy. Fluorescence microscopy showed that such bound eLUVs did not fuse. Hydrogel-bound eLUV membrane permeability was assessed using (31)P MAS NMR in the presence of the chemical shift agent praseodymium and demonstrated that only at lower degrees of hydrophobic modification of the core-shell hydrogels was eLUV membrane barrier integrity maintained when T < VPT. At a low degree of hydrophobic modification, cycling the temperature above the VPT even for short periods caused the eLUV membranes to become leaky. Hence, eLUV membrane permeability was coupled to the hydrogel VPT, a situation that would be useful in applications requiring triggered release of liposomal contents.
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Affiliation(s)
- Neil MacKinnon
- Department of Chemistry, University of Toronto, Toronto, Ontario, Canada
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9
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Affiliation(s)
- Stefan Balaz
- Department of Pharmaceutical Sciences, College of Pharmacy, North Dakota State University, Fargo, North Dakota 58105, USA.
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10
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Svec F. Stellan Hjertén's contribution to the development of monolithic stationary phases. Electrophoresis 2008; 29:1593-603. [PMID: 18383033 DOI: 10.1002/elps.200700569] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
This overview is presented to celebrate the birthday of one of the luminaries of the separation science and my friend - Stellan Hjertén. He made significant contributions to a variety of areas in separation science such as electrophoresis, LC, and CEC to name just a few. Since the scope of his work was enormous, this review will focus only on a single aspect of his scientific activities, the design and applications of monolithic materials. During the years starting from 1989, Stellan Hjertén published many excellent papers concerning the preparation of acrylamide chemistry-based monoliths and their use in both micro-HPLC and CEC. The following text details his works in the field.
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Affiliation(s)
- Frantisek Svec
- The Molecular Foundry, E.O. Lawrence Berkeley National Laboratory, Berkeley, CA 94720-8197, USA.
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11
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Lee TH, Aguilar MI. Trends in the development and application of functional biomembrane surfaces. BIOTECHNOLOGY ANNUAL REVIEW 2006; 12:85-136. [PMID: 17045193 DOI: 10.1016/s1387-2656(06)12004-9] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/10/2023]
Affiliation(s)
- Tzong-Hsien Lee
- Department of Biochemistry and Molecular Biology, Monash University, Victoria 3800, Australia
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12
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Escuder-Gilabert L, Molero-Monfort M, Villanueva-Camañas RM, Sagrado S, Medina-Hernández MJ. Potential of biopartitioning micellar chromatography as an in vitro technique for predicting drug penetration across the blood-brain barrier. J Chromatogr B Analyt Technol Biomed Life Sci 2005; 807:193-201. [PMID: 15203029 DOI: 10.1016/j.jchromb.2004.04.004] [Citation(s) in RCA: 55] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2004] [Revised: 03/31/2004] [Accepted: 03/31/2004] [Indexed: 10/26/2022]
Abstract
The blood-brain barrier (BBB) is considered to be the main barrier to drug transport into the central nervous system (CNS). The BBB restricts the passive diffusion of many drugs from blood to brain. The ease with which any particular drug diffuses across the BBB is determined largely by the molecular features of drugs, and it is therefore possible to predict the BBB permeability of a drug from its molecular structure. Biopartitioning micellar chromatography (BMC), a mode of micellar liquid chromatography that uses micellar mobile phases of Brij35 in adequate experimental conditions, can be useful in mimicking the drug partitioning process into biological systems. Retention in BMC depends on the hydrophobicity, electronic and steric properties of drugs. In this paper, the usefulness of BMC for predicting the BBB penetration ability of drugs expressed as the brain/blood distribution coefficient (BB) is demonstrated. A multiple linear regression (MLR) model that relates the BB distribution coefficients data with BMC retention data and total molar charge is proposed. The model is obtained using 44 heterogeneous drugs including, neutral, anionic, and cationic compounds. A comparison with other reported methodologies to predict the BBB permeability is also presented.
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Affiliation(s)
- L Escuder-Gilabert
- Departamento de Química Analítica, Universidad de Valencia, C/Vicente Andrés Estellés s/n, 46100 Burjassot, Valencia, Spain
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13
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Escuder-Gilabert L, Sagrado S, Villanueva-Camañas RM, Medina-Hernández MJ. Quantitative structure-retention relationships for ionic and non-ionic compounds in biopartitioning micellar chromatography. Biomed Chromatogr 2004; 19:155-68. [PMID: 15515109 DOI: 10.1002/bmc.432] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Quantitative structure-retention relationships, QSRRs, represent a powerful tool in chromatography. The objectives of QSRR studies are to predict the chromatographic retention behaviour of solutes based on their structural properties, to elucidate retention mechanisms, to optimize the separation of complex mixtures or to prepare experimental designs. In this paper, using the retention factors of 151 structurally unrelated solutes that cover a wide range of hydrophobicity, molecular size, hydrogen bonding properties and ionization degrees obtained in biopartitioning micellar chromatography (BMC) at different Brij35 micellar concentrations, several multivariate QSRR models are tested. It is demonstrated that the chromatographic retention of any molecule in BMC, independently of its family, can be adequately described by its hydrophobicity (expressed as log P) and its anionic and cationic total molar charge (expressed as alpha(A) and alpha(B)).
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Affiliation(s)
- L Escuder-Gilabert
- Departamento de Química Analítica, Universitat de València, C/ Vicente Andrés Estellés s/n, E-46100 Burjassot, Valencia, Spain
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14
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Wiedmer SK, Riekkola ML, Jussila MS. Phospholipids and liposomes in liquid chromatographic and capillary electromigration techniques. Trends Analyt Chem 2004. [DOI: 10.1016/j.trac.2004.03.001] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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15
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Maruska A, Kornysova O. Continuous beds (monoliths): stationary phases for liquid chromatography formed using the hydrophobic interaction-based phase separation mechanism. ACTA ACUST UNITED AC 2004; 59:1-48. [PMID: 15134905 DOI: 10.1016/j.jbbm.2003.12.003] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2003] [Revised: 12/09/2003] [Accepted: 12/09/2003] [Indexed: 01/10/2023]
Abstract
The pioneering research work published by Hjertén et al. [J. Chromatogr. 473 (1989) 273] in 1989 dealing with development and application of the continuous bed (monolithic) technique as an attractive alternative for the classical packed columns in chromatography, stimulated further investigations in this direction. The research data published since that time on the development and application of the continuous beds formed using hydrophobic interaction-based phase separation mechanism are reviewed. Some innovative species of the beds, such as polyrotaxane beds or nonparticulate restricted-access materials for direct analysis of the biological fluids in the capillary format are also discussed. Characteristic features and practical details of the continuous bed technique are revealed. Due to many advantages, the continuous bed technique became a competitor with the traditional packings in capillary or chip-based microanalysis. The importance of the continuous bed morphology on the chromatographic characteristics is shown. The applicability of modern microscopic analysis to evaluate the morphology of the continuous beds is demonstrated.
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Affiliation(s)
- Audrius Maruska
- Department of Chemistry, Vytautas Magnus University, Vileikos 8, LT-3035 Kaunas, Lithuania.
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16
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Mao X, Kong L, Li X, Guo B, Zou H. Unilamellar liposomes covalently coupled on silica gel for liquid chromatography. Anal Bioanal Chem 2003; 375:550-5. [PMID: 12610709 DOI: 10.1007/s00216-002-1721-0] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2002] [Revised: 10/31/2002] [Accepted: 11/25/2002] [Indexed: 11/27/2022]
Abstract
Silica gel was used as a support for the covalent coupling of liposomes, which could overcome drawbacks of soft gel beads in column efficiency and separation speed. The influences of the concentration of added dimethylaminopyridine and reaction time on the chloroformate activation reaction of silica gel were investigated. Temperature and pH for covalent coupling of liposomes on the activated silica gel were also optimized. Experimental results indicated that the stability of the covalently coupled liposome columns was obviously superior to that of the noncovalently coated liposome columns but the selectivity of both columns was basically identical. Separation and analysis of a crude extract of a traditional Chinese medicine Ligusticum Wallichii and a mixture of small peptides on both columns further support this conclusion.
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Affiliation(s)
- Xiqin Mao
- National Chromatographic R & A Center, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 116011, Dalian, China
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17
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Tsirkin I, Grushka E. Characterization of dynamically prepared phospholipid-modified reversed-phase columns. J Chromatogr A 2001; 919:245-54. [PMID: 11442029 DOI: 10.1016/s0021-9673(01)00824-x] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
We have modified a reversed-phase (RP8) column by passing through it an aqueous solution of phosphatidylcholine-based liposomes. The phospholipids from the liposomes adsorb onto the octyl chain of the stationary phase, thus altering the nature of the stationary phase and of the chromatographic interactions. The properties of the phospholipid-modified column were investigated using solutes belonging to several chemical classes. We found that the retention factors of negatively and positively charged solutes decreased as the amount of phospholipid in the column was increased. For the solutes studied here the extent of the decrease was smaller for the positive solutes. With neutral solutes, the retention factors of some (benzenediols) increased markedly while with others (ketones) the retention factors decreased. The selectivities between the various solutes on the phospholipid-modified column were different than on the original reversed-phase column. The retention behavior of the solutes can be explained in terms of (1) effective shielding of the hydrophobic part of the stationary phase by the polar head groups of the phospholipids and (2) hydrogen bond formation between the solutes and the carbonyl oxygens as well as the non-ester phosphate oxygens in the polar head groups of the phospholipids.
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Affiliation(s)
- I Tsirkin
- Department of Inorganic and Analytical Chemistry, The Hebrew University of Jerusalem, Israel
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18
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Liu XY, Yang Q, Kamo N, Miyake J. Effect of liposome type and membrane fluidity on drug–membrane partitioning analyzed by immobilized liposome chromatography. J Chromatogr A 2001; 913:123-31. [PMID: 11355804 DOI: 10.1016/s0021-9673(00)01266-8] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Immobilized liposome chromatography (ILC) has been proven to be a useful method for the study or rapid screening of drug-membrane interactions. To obtain an adequate liposomal membrane phase for ILC, unilamellar liposomes were immobilized in gel beads by avidin-biotin binding. The retardation of 15 basic drugs on the liposome column could be converted to membrane partitioning coefficients, K(LM). The effects of small or large unilamellar liposomes and multilamellar liposomes on the drug-membrane partitioning were compared. The K(LM) values for both small and large liposomes were similar, but higher than those for the multilamellar liposomes. The basic drugs showed stronger partitioning into negatively charged liposomes than into either neutral liposomes or positively charged liposomes. The membrane fluidity of the immobilized liposomes was modulated by incorporating cholesterol into the liposomal membranes, by changing the acyl chain length and degree of unsaturation of the phospholipids, and by changing the temperature for ILC runs. Our data show that K(LM) obtained using ILC correlated well with those reported by batch studies using free liposomes. It is concluded that negatively charged or cholesterol-containing large unilamellar liposomes are suitable models for the ILC analysis of drug-membrane interactions.
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Affiliation(s)
- X Y Liu
- National Institute for Advanced Interdisciplinary Research, Agency of Industrial Science and Technology, Tsukuba, Ibaraki, Japan
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19
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Liu X, Yang Q, Nakamura C, Miyake J. Avidin-biotin-immobilized liposome column for chromatographic fluorescence on-line analysis of solute-membrane interactions. JOURNAL OF CHROMATOGRAPHY. B, BIOMEDICAL SCIENCES AND APPLICATIONS 2001; 750:51-60. [PMID: 11204223 DOI: 10.1016/s0378-4347(00)00427-8] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Unilamellar liposomes with entrapped fluorescent dye calcein were stably immobilized in gel beads by avidin-biotin-binding. The immobilized liposomes remained extremely stable upon storage and chromatographic runs. The immobilized calcein-entrapped liposomes were utilized for fluorescent analysis of solute-membrane interactions, which in some cases are too weak to be detected by chromatographic retardation. A liposome column was used as a sensitive probe to detect the interactions of membranes with pharmaceutical drugs, peptides and proteins. Retardation of the solutes was monitored using a UV detector. Perturbation of the membranes, reflected as leakage of the entrapped calcein by some of the solutes, can thus be detected on-line using a flow-fluorescent detector. For the amphiphilic drugs or synthetic peptides, perturbation of membranes became more pronounced when the retardation (hydrophobicity) of the molecules increased. On the other hand, in the case of positively-charged peptides, polylysine, or partially denatured bovine carbonic anhydrase, significant dye leakage from the liposomes was observed although the retardation was hardly to be measured. Weak protein-membrane interactions can thus be assumed from the large leakage of calcein from the liposomes. This provides additional useful information for solute-membrane interactions, as perturbation of the membranes was also indicated by avidin-biotin-immobilized liposome chromatography (ILC).
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Affiliation(s)
- X Liu
- National Institute for Advanced Interdisciplinary Research, Agency of Industrial Science and Technology, Tsukuba, Ibaraki, Japan
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Molero-Monfort M, Martín-Biosca Y, Sagrado S, Villanueva-Camañas RM, Medina-Hernández MJ. Micellar liquid chromatography for prediction of drug transport. J Chromatogr A 2000; 870:1-11. [PMID: 10722056 DOI: 10.1016/s0021-9673(99)01067-5] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
The vast majority of well absorbed drugs are transported passively across the cell membranes. Physicochemical descriptors of drug molecules that are believed to influence transcellular transport are routinely used to predict drug absorption by means of complex mathematical models. In this paper, a new in vitro method, based on the retention data in micellar liquid chromatography (MLC), is validated for the prediction of passive drug absorption. The retention of a heterogeneous drugs set in MLC using Brij 35 as surfactant in the mobile phase is compared with the retention data reported in literature obtained in red cell membrane lipid liposomes, human red cell membranes vesicles (vesicles), native membranes of adsorbed red cells (ghosts) and egg phospholipids liposomes [Beigi et al., Int. J. Pharm., 164 (1998) 129-137]. Finally, the correlation between the logarithm of retention factors in MLC and reported oral drug absorption values for barbiturates and beta-blockers is studied. Predictive regression models for estimating oral drug absorption using the logarithm of the retention values as independent variable are proposed.
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Affiliation(s)
- M Molero-Monfort
- Departamento de Química Analítica, Universidad de Valencia, Burjassot, Spain
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21
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Molero-Monfort M, Sagrado S, Villanueva-Camañas RM, Medina-Hernández MJ. Retention-activity relationship studies of benzodiazepines by micellar liquid chromatography. Biomed Chromatogr 1999; 13:394-400. [PMID: 10477896 DOI: 10.1002/(sici)1099-0801(199910)13:6<394::aid-bmc898>3.0.co;2-0] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Solute partitioning into lipid bilayers of biological membranes is the basis for drug and metabolite uptake, passive transport across membranes and bioaccumulation. In order to emulate in vitro the partitioning process in the biomembranes, different approaches have been proposed. The use of micellar solutions as mobile phases in reversed-phase liquid chromatography (micellar liquid chromatography, MLC) has proven to be valid in the prediction of the biological activities of local anesthetics, catecholamines and barbiturates. In this paper we focus our attention on benzodiazepines. The retention of benzodiazepines using different concentrations of Brij35 as micellar mobile phase in modified C(18) stationary phase was studied. Quantitative retention-activity relationships (QRAR) in MLC were investigated for these compounds. An adequate correlation between the capacity factors (log k) and the toxicity (log LD(50)) and anxiolitic activity (log ED(50)) of benzodiazepines was obtained.
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Affiliation(s)
- M Molero-Monfort
- Departamento de Química Analítica, Universidad de Valencia, C/ Vicente Andrés Estellés s/n, 46100 Burjassot, Valencia, Spain
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Abstract
Drug interaction with lipid bilayers was quantified by immobilized biomembrane chromatography on a series of columns containing different small amounts of human red cell membrane vesicles to extend and characterize this technique, which shows a potential for drug screening and prediction of drug absorption in humans. The chromatographic retention volume for each drug was essentially proportional to the amount of immobilized lipid, and the slope equalled the capacity factor (Ks) previously determined on single columns. Gel beds containing 0.5-2 micromol of membrane phospholipid allowed analysis of drugs with log Ks values of 2.5-4.3 in time periods of 1 min to 1 h. Highly lipophilic drugs could thus be analyzed conveniently in aqueous buffer.
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Affiliation(s)
- F Beigi
- Department of Biochemistry, Biomedical Center, Uppsala University, Sweden
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24
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Hjertén S. Standard and Capillary Chromatography, Including Electrochromatography, on Continuous Polymer Beds (Monoliths), Based on Water-Soluble Monomers. Ind Eng Chem Res 1999. [DOI: 10.1021/ie970676b] [Citation(s) in RCA: 66] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Affiliation(s)
- Stellan Hjertén
- Department of Biochemistry, Uppsala University, Biomedical Center, P.O. Box 576, S-751 23 Uppsala, Sweden
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25
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Wainer IW, Zhang Y, Xiao Y, Kellar KJ. Liquid chromatographic studies with immobilized neuronal nicotinic acetylcholine receptor stationary phases: effects of receptor subtypes, pH and ionic strength on drug-receptor interactions. JOURNAL OF CHROMATOGRAPHY. B, BIOMEDICAL SCIENCES AND APPLICATIONS 1999; 724:65-72. [PMID: 10202958 DOI: 10.1016/s0378-4347(98)00579-9] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
Nicotinic acetylcholine receptor (nAChR) alpha3-subunits, beta4-subunits, alpha3/beta4-subunit combination and alpha4/beta2-subunit combination were immobilized on chromatographic stationary phases and the binding affinities of the different nAChR subtypes were chromatographically evaluated. The observed relative binding affinities of epibatidine were alpha4/beta2>alpha3/beta4 and epibatidine did not bind at alpha3-subunits and beta4-subunits. No significant difference in binding affinities was observed on the alpha4/beta2 nAChRs immobilized in immobilized artificial membrane (IAM) particles and those sterically immobilized on Superdex 200 beads. The effects of mobile phase pH and ionic strength on the binding affinities of the alpha3/beta4 nAChRs support were also investigated. The results are consistent with the proposed ligand-nAChR binding model in which a cationic center exists at the binding site.
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Affiliation(s)
- I W Wainer
- Department of Pharmacology, Georgetown University School of Medicine, Washington, DC 20007, USA
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Lundahl P, Zeng CM, Lagerquist Hägglund C, Gottschalk I, Greijer E. Chromatographic approaches to liposomes, proteoliposomes and biomembrane vesicles. JOURNAL OF CHROMATOGRAPHY. B, BIOMEDICAL SCIENCES AND APPLICATIONS 1999; 722:103-20. [PMID: 10068136 DOI: 10.1016/s0378-4347(98)00370-3] [Citation(s) in RCA: 42] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
Size-exclusion chromatography has been used for fractionation of liposomes, proteoliposomes and biomembrane vesicles of up to approximately 500 nm in size and for separation of these entities from smaller components. Liposome sizes, encapsulation stability, and solute affinities for membrane proteins have been determined. Counter-current distribution in aqueous two-phase systems has widened the range of applications to larger structures. Immobilized biomembrane vesicles and (proteo)liposomes provide stationary phases for chromatographic analysis of specific or nonspecific membrane-solute interactions.
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Affiliation(s)
- P Lundahl
- Department of Biochemistry, Biomedical Center, Uppsala University, Sweden
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Zhang Y, Xiao Y, Kellar KJ, Wainer IW. Immobilized nicotinic receptor stationary phase for on-line liquid chromatographic determination of drug-receptor affinities. Anal Biochem 1998; 264:22-5. [PMID: 9784183 DOI: 10.1006/abio.1998.2828] [Citation(s) in RCA: 75] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Nicotinic acetylcholine receptors (nAChR) are ligand-gated ion channels which mediate nicotinic cholinergic transmission in the nervous system. A nAChR subtype composed of alpha3 and beta4 subunits (alpha3/beta4 subtype), prepared from a stably transfected KXalpha3beta4R2 cell line, has been immobilized in the phospholipid monolayer of an immobilized artificial membrane (IAM) liquid chromatography (LC) stationary phase. Approximately 60 mg of protein was immobilized per gram IAM particles. The resulting phase was used for the rapid on-line chromatographic determination of drug binding affinities to nAChRs. Relative binding affinities were determined by frontal chromatography for (+/-)-epibatidine (Kd: 0.27 +/- 0.05 nM) > A85380 (Kd: 17.2 +/- 0.5 nM) > (-)-nicotine (Kd: 88 +/- 33 nM) > carbachol (Kd: 1280 +/- 30 nM) > atropine (Kd: 14,570 +/- 2600 nM). These results are consistent with the affinity rank order obtained from binding assays using membrane homogenates. The immobilized receptor LC stationary phase was stable and reproducible. This approach opens up the possibility of the production of a variety of immobilized receptor LC stationary phases which may be used for direct determination of drug-receptor binding interactions and for the rapid on-line screening of combinatorial pools for drug candidates.
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Affiliation(s)
- Y Zhang
- Department of Pharmacology, Georgetown University School of Medicine, Washington, DC, 20007, USA
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Zeng L, Kassel DB. Developments of a Fully Automated Parallel HPLC/Mass Spectrometry System for the Analytical Characterization and Preparative Purification of Combinatorial Libraries. Anal Chem 1998. [DOI: 10.1021/ac9805448] [Citation(s) in RCA: 91] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Lu Zeng
- CombiChem, Inc., 9050 Camino Santa Fe, San Diego, California 92121
| | - Daniel B. Kassel
- CombiChem, Inc., 9050 Camino Santa Fe, San Diego, California 92121
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Yang Q, Liu XY, Ajiki S, Hara M, Lundahl P, Miyake J. Avidin-biotin immobilization of unilamellar liposomes in gel beads for chromatographic analysis of drug-membrane partitioning. JOURNAL OF CHROMATOGRAPHY. B, BIOMEDICAL SCIENCES AND APPLICATIONS 1998; 707:131-41. [PMID: 9613942 DOI: 10.1016/s0378-4347(97)00620-8] [Citation(s) in RCA: 62] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
To construct a homogeneous lipid membrane chromatographic phase, biotinylated unilamellar liposomes of small and large sizes (SUVs and LUVs, respectively) were immobilized in avidin- or streptavidin-derived gel beads in amounts up to 55 micromol phospholipid/ml gel bed at yields above 50%. The immobilized liposomes exhibited excellent stability due to avidin-biotin multiple-site binding. The trapped volume and size distribution of the immobilized liposomes (0.33-0.42 microl/micromol lipid and 20-30 nm diameter for SUVs, 1.7-1.9 microl/micromol lipid and 80-120 nm for LUVs) indicated the unilamellarity and integrity of the immobilized liposomes. Partitioning of 15 pharmaceutical drugs into the bilayers of LUVs immobilized in different gel matrices correlated very well, as shown by chromatographic drug retention analysis. The partitioning of several beta-blockers into the immobilized LUVs showed a close correlation with their partitioning, reported in the literature, into free liposomes. The avidin-biotin-immobilized unilamellar liposomes can thus be used for chromatographic analysis and screening of solute-membrane interactions.
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Affiliation(s)
- Q Yang
- Biomic Design Group, National Institute for Advanced Interdisciplinary Research, Agency of Industrial Science and Technology, Ibaraki, Japan
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30
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Beigi F, Gottschalk I, Lagerquist Hägglund C, Haneskog L, Brekkan E, Zhang Y, Österberg T, Lundahl P. Immobilized liposome and biomembrane partitioning chromatography of drugs for prediction of drug transport. Int J Pharm 1998. [DOI: 10.1016/s0378-5173(97)00398-0] [Citation(s) in RCA: 70] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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31
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Lundqvist A, Lundahl P. Chromatography on cells and biomolecular assemblies. JOURNAL OF CHROMATOGRAPHY. B, BIOMEDICAL SCIENCES AND APPLICATIONS 1997; 699:209-20. [PMID: 9392376 DOI: 10.1016/s0378-4347(97)00143-6] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Red cells, biomembrane vesicles, proteoliposomes and liposomes non-covalently immobilized in gel particles or beads have been used as stationary phases for biomembrane affinity analyses and ion-exchange chromatographic separation. Lipid monolayers coupled to silica beads have been utilized for membrane protein purification in detergent solution and plant cell walls for group separation of macromolecules according to size and charge. Further methodological studies are essential to implement general practical application.
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Affiliation(s)
- A Lundqvist
- Department of Biochemistry, Biomedical Center, Uppsala University, Sweden
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32
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Lundahl P, Beigi F. Immobilized liposome chromatography of drugs for model analysis of drug-membrane interactions. Adv Drug Deliv Rev 1997. [DOI: 10.1016/s0169-409x(96)00437-1] [Citation(s) in RCA: 60] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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