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Jiang H, Zhang H, Yin SJ, Lu M, Wang X, Yang FQ. Determination of lipid-water partition coefficient of neutral and ionic drugs by liposome electrokinetic chromatography. Electrophoresis 2021; 42:1436-1449. [PMID: 33908064 DOI: 10.1002/elps.202000382] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2020] [Revised: 04/17/2021] [Accepted: 04/20/2021] [Indexed: 11/08/2022]
Abstract
Profiling of lipid-water partition coefficients (KL/W ) of drugs is an essential issue during the early stage of drug development. In this study, two liposomes, including 1,2-distearoyl-sn-glycero-3-phosphocholine (DSPC) + cholesterol (Chol) (DSPC/Chol liposomes) and soybean lecithin (SPC) + Chol (SPC/Chol liposomes), were prepared for the liposome electrokinetic chromatography (LEKC) analysis, and the logarithm of lipid-water partition coefficients (log KL/W ) of neutral and ionic drugs were determined based on an iterative method. The log KL/W values determined by the SPC/Chol or DSPC/Chol liposomes LEKC were linearly fitted, which showed a good fitting coefficient (R2 = 0.89). Furthermore, the linear relationship between the data obtained from LEKC system and octanol-water system, immobilized artificial membrane, Caco-2 cell model, and software prediction was analyzed, respectively. Results illustrated that DSPC/Chol liposomes or SPC/Chol liposomes had a good linear relationship with Caco-2 cell model, and R2 was 0.81 and 0.72, respectively. Moreover, the linear free energy relationship analysis suggested that the solute volume, hydrogen bond basicity, and J- were the main descriptors that drove the partition process of solutes in the SPC/Chol or DSPC/Chol LEKC system. In addition, the normalized properties of the SPC/Chol and DSPC/Chol LEKC systems through linear free energy relationship analysis were very close. In short, DSPC/Chol liposomes are more suitable for simulating cell membranes than SPC/Chol liposomes, and the developed LEKC is an effective partitioning model for measuring the log KL/W of drugs.
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Affiliation(s)
- Hui Jiang
- School of Chemistry and Chemical Engineering, Chongqing University, Chongqing, P. R. China
| | - Hao Zhang
- School of Chemistry and Chemical Engineering, Chongqing University, Chongqing, P. R. China
| | - Shi-Jun Yin
- School of Chemistry and Chemical Engineering, Chongqing University, Chongqing, P. R. China
| | - Min Lu
- School of Chemistry and Chemical Engineering, Chongqing University, Chongqing, P. R. China
| | - Xu Wang
- School of Chemistry and Chemical Engineering, Chongqing University, Chongqing, P. R. China
| | - Feng-Qing Yang
- School of Chemistry and Chemical Engineering, Chongqing University, Chongqing, P. R. China
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2
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Guilleux C, Campbell PGC, Fortin C. Interactions Between Silver Nanoparticles/Silver Ions and Liposomes: Evaluation of the Potential Passive Diffusion of Silver and Effects of Speciation. ARCHIVES OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY 2018; 75:634-646. [PMID: 30238147 DOI: 10.1007/s00244-018-0562-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/29/2018] [Accepted: 09/10/2018] [Indexed: 06/08/2023]
Abstract
Silver nanoparticles, used mainly for their antibacterial properties, are among the most common manufactured nanomaterials. How they interact with aquatic organisms, especially how they cross biological membranes, remains uncertain. Free Ag+ ions, released from these nanoparticles, are known to play an important role in their overall bioavailability. In this project, we have studied the uptake of dissolved and nanoparticulate silver by liposomes. These unilamellar vesicles, composed of phospholipids, have long been used as models for natural biological membranes, notably to study the potential uptake of solutes by passive diffusion through the phospholipid bilayer. The liposomes were synthesized using extrusion techniques and were exposed over time to dissolved silver under different conditions where Ag+, AgS2O3-, or AgCl0 were the dominant species. Similar experiments were conducted with the complexes HgCl 2 0 and Cd(DDC) 2 0 , both of which are hydrophobic and known to diffuse passively through biological membranes. The uptake kinetics of Ag+, HgCl 2 0 , and Cd(DDC) 2 0 show no increase in internalized concentrations over time, unlike AgS2O3- and AgCl0, which appear to pass through the phospholipid bilayer. These results are in contradiction with our initial hypothesis that lipophilic Hg and Cd complexes would be able to cross the membrane, whereas silver would not. Encapsulated tritiated water inside the liposomes was shown to rapidly diffuse through the lipid bilayer, suggesting a high permeability. We hypothesize that monovalent anions or complexes as well as small neutral complexes with a strong dipole can diffuse through our model membrane. Finally, liposomes were exposed to 5-nm polyvinylpyrrolidone-coated silver nanoparticles over time. No significant uptake of nanoparticulate silver was observed. Neither disruption of the membrane nor invagination of nanoparticles into the liposomes was observed. This suggests that the main risk caused by AgNPs for nonendocytotic biological cells would be the elevation of the free silver concentration near the membrane surface due to adsorption of AgNPs and subsequent oxidation/dissolution.
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Affiliation(s)
- Camille Guilleux
- Institut National de la Recherche Scientifique, INRS Eau Terre et Environnement, 490 rue de la Couronne, Quebec, G1K 9A9, Canada
| | - Peter G C Campbell
- Institut National de la Recherche Scientifique, INRS Eau Terre et Environnement, 490 rue de la Couronne, Quebec, G1K 9A9, Canada
| | - Claude Fortin
- Institut National de la Recherche Scientifique, INRS Eau Terre et Environnement, 490 rue de la Couronne, Quebec, G1K 9A9, Canada.
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3
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A novel enantioseparation approach based on liposome electrokinetic capillary chromatography. J Pharm Biomed Anal 2017; 145:186-194. [DOI: 10.1016/j.jpba.2017.06.008] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2017] [Revised: 06/03/2017] [Accepted: 06/05/2017] [Indexed: 11/19/2022]
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4
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Ophthalmic administration of a 10-fold-lower dose of conventional nanoliposome formulations caused levels of intraocular pressure similar to those induced by marketed eye drops. Eur J Pharm Sci 2017; 111:186-194. [PMID: 28923571 DOI: 10.1016/j.ejps.2017.09.024] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2017] [Revised: 08/13/2017] [Accepted: 09/14/2017] [Indexed: 10/18/2022]
Abstract
The purpose of this study was to compare the in vivo efficacy of several timolol (TM)-loaded liposomal formulations with current TM antiglaucoma treatment (aqueous 0.5% w/v eye drops). In this study, conventional liposomes (CL) and deformable liposomes, without (DL1) and with ethanol (DL2) were prepared and characterized. In addition, in vitro release and permeation studies, as well as in vivo lowering intraocular pressure (IOP) and biocompatibility studies were performed. It was found that the quali and quantitative lipid bilayer composition played a significant role in modifying the physical properties of vesicles. The deformability study and electronic microscopy images revealed that membrane elasticity of DL1 and DL2 was much higher than CL. However, in vitro permeation results showed that the flux and permeability coefficient were significantly higher in CL compared to DL. The IOP study revealed that TM-loaded CL showed the best pharmacological activity, in comparison to deformable vesicles. Compared to the eye drops, CL formulation could equally reduce the IOP but using a concentration 10-fold lower, whereas the effective time was significantly longer. In addition, the formulations showed no irritant effects after instillation on the ocular surface.
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Mitkova D, Vitkova V. The aqueous surroundings alter the bending rigidity of lipid membranes. RUSS J ELECTROCHEM+ 2016. [DOI: 10.1134/s1023193516120090] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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6
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Shahmoradi T, Sepehry H, Ashrafpour M. pH regulation of amphotericin B channels activity in the bilayer lipid membrane. J Nat Sci Biol Med 2016; 7:85-8. [PMID: 27003977 PMCID: PMC4780175 DOI: 10.4103/0976-9668.175082] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Background: Amphotericin B (AmB) is a polyene antibiotic frequently applied in the treatment of systemic fungal infections in spite of its secondary effects. The pH plays a crucial role in modulating biophysical features of ion channels in the bilayer lipid membranes. Aim: In this study, the role of pH in the regulation of AmB channel was assessed by single channel recording of ion channel incorporated in the artificial membrane. Materials and Methods: Bilayer lipid membrane was formed by phosphatidylcholine in a 350 μm diameter aperture between two chambers, cis and trans contained 200/50 mMKCl solutions, respectively; then AmB was incorporated into the bilayer lipid membrane. Single channel recordings were used to indicate the effects of pH changes on AmB channels activity. The records were analyzed by Clamp fit 10 software. Results: A kinetic analysis of single channel currents indicated a cation ion channel with 500 pS conductance and voltage-dependence of the open probability of the AmB channel (Po). A reduction of cis pH to 6 decreased Po and conductance. This effect was also voltage-dependent, being greater at a more positive above −40. The pH changes in the range of 6-8 had no effect on the reversal potential and ion selectivity. Conclusion: Our data indicated that extracellular acidity can reduce AmB activity.
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Affiliation(s)
- Tahereh Shahmoradi
- Department of Physiology, Faculty of Medicine, International Branch of Shahid Behshti University of Medical Sciences, Shemiranat, Tehran, Iran
| | - Hamid Sepehry
- Neuroscience Research Center, Golestan University of Medical Sciences, Gorgan, Golestan, Iran
| | - Manuchehr Ashrafpour
- Department of Physiology, Faculty of Medicine, Babol University of Medical Sciences, Babol, Mazandaran, Iran
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7
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Kazarjan J, Mahlapuu R, Hansen M, Soomets U, Kaljurand M, Vaher M. Investigation of the surfactant type and concentration effect on the retention factors of glutathione and its analogues by micellar electrokinetic chromatography. J Sep Sci 2015. [DOI: 10.1002/jssc.201500567] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Jana Kazarjan
- Department of Chemistry; Tallinn University of Technology; Tallinn Estonia
| | - Riina Mahlapuu
- Institute of Biomedicine and Translational Medicine, Department of Biochemistry, Centre of Excellence for Translational Medicine; University of Tartu; Tartu Estonia
| | - Mats Hansen
- Institute of Biomedicine and Translational Medicine, Department of Biochemistry, Centre of Excellence for Translational Medicine; University of Tartu; Tartu Estonia
| | - Ursel Soomets
- Institute of Biomedicine and Translational Medicine, Department of Biochemistry, Centre of Excellence for Translational Medicine; University of Tartu; Tartu Estonia
| | - Mihkel Kaljurand
- Department of Chemistry; Tallinn University of Technology; Tallinn Estonia
| | - Merike Vaher
- Department of Chemistry; Tallinn University of Technology; Tallinn Estonia
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8
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Vesicles formed by mixed catanionic surfactants as novel pseudostationary phase in electrokinetic chromatography. J Chromatogr A 2014; 1359:296-302. [DOI: 10.1016/j.chroma.2014.07.016] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2014] [Revised: 07/03/2014] [Accepted: 07/07/2014] [Indexed: 11/20/2022]
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9
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Teixeira VH, Vila-Viçosa D, Baptista AM, Machuqueiro M. Protonation of DMPC in a Bilayer Environment Using a Linear Response Approximation. J Chem Theory Comput 2014; 10:2176-84. [DOI: 10.1021/ct5000082] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Vitor H. Teixeira
- Centro
de Química e Bioquímica, Departamento de Química
e Bioquímica, Faculdade de Ciências, Universidade de Lisboa, 1749-016 Lisboa, Portugal
| | - Diogo Vila-Viçosa
- Centro
de Química e Bioquímica, Departamento de Química
e Bioquímica, Faculdade de Ciências, Universidade de Lisboa, 1749-016 Lisboa, Portugal
| | - António M. Baptista
- Instituto
de Tecnologia Química e Biológica, Universidade Nova de Lisboa, Av. da República, 2780-157 Oeiras, Portugal
| | - Miguel Machuqueiro
- Centro
de Química e Bioquímica, Departamento de Química
e Bioquímica, Faculdade de Ciências, Universidade de Lisboa, 1749-016 Lisboa, Portugal
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10
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Zhang W, Sun J, He Z. The application of open disk-like structures as model membrane and drug carriers. Asian J Pharm Sci 2013. [DOI: 10.1016/j.ajps.2013.07.019] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022] Open
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11
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Naumowicz M, Figaszewski ZA, Poltorak L. Electrochemical impedance spectroscopy as a useful method for examination of the acid–base equilibria at interface separating electrolyte solution and phosphatidylcholine bilayer. Electrochim Acta 2013. [DOI: 10.1016/j.electacta.2012.12.093] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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12
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13
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Wiedmer SK, Lokajová J. Capillary electromigration techniques for studying interactions between analytes and lipid dispersions. J Sep Sci 2012; 36:37-51. [DOI: 10.1002/jssc.201200829] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2012] [Revised: 09/26/2012] [Accepted: 09/26/2012] [Indexed: 11/11/2022]
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14
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Franzen U, Østergaard J. Physico-chemical characterization of liposomes and drug substance–liposome interactions in pharmaceutics using capillary electrophoresis and electrokinetic chromatography. J Chromatogr A 2012; 1267:32-44. [DOI: 10.1016/j.chroma.2012.07.018] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2012] [Revised: 07/02/2012] [Accepted: 07/06/2012] [Indexed: 01/19/2023]
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15
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Chromatography approaches for early screening of the phospholipidosis-inducing potential of pharmaceuticals. J Pharm Biomed Anal 2012; 61:184-90. [DOI: 10.1016/j.jpba.2011.11.033] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2011] [Revised: 11/29/2011] [Accepted: 11/30/2011] [Indexed: 11/21/2022]
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16
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El Deeb S, Iriban MA, Gust R. MEKC as a powerful growing analytical technique. Electrophoresis 2010; 32:166-83. [PMID: 21171121 DOI: 10.1002/elps.201000398] [Citation(s) in RCA: 83] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2010] [Revised: 09/30/2010] [Accepted: 09/30/2010] [Indexed: 11/11/2022]
Abstract
This review summarizes the principle and the developments in MEKC in terms of separation power, sensitivity, and detection approaches more than 25 years after its appearance. Newly used surfactants are mentioned. Classical and new sample concentration techniques in MEKC are described. The different detection approaches in MEKC with advantages, limitations, and future prospects are also discussed. This review highlights the wider application of MEKC in different analytical fields. Various recent selected applications of this technique in different analytical fields are reported.
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Affiliation(s)
- Sami El Deeb
- Institute of Pharmacy, Freie Universität Berlin, Berlin, Germany
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17
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Laine J, Lokajová J, Parshintsev J, Holopainen JM, Wiedmer SK. Interaction of a commercial lipid dispersion and local anesthetics in human plasma: implications for drug trapping by “lipid-sinks”. Anal Bioanal Chem 2010; 396:2599-607. [DOI: 10.1007/s00216-009-3435-z] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2009] [Revised: 12/23/2009] [Accepted: 12/28/2009] [Indexed: 10/19/2022]
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18
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Cherney DP, Harris JM. Confocal Raman microscopy of optical-trapped particles in liquids. ANNUAL REVIEW OF ANALYTICAL CHEMISTRY (PALO ALTO, CALIF.) 2010; 3:277-97. [PMID: 20636043 DOI: 10.1146/annurev-anchem-070109-103404] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
The in situ analysis of small, dispersed particles in liquids is a challenging problem, the successful solution to which influences diverse applications of colloidal particles in materials science, synthetic chemistry, and molecular biology. Optical trapping of small particles with a tightly focused laser beam can be combined with confocal Raman microscopy to provide molecular structure information about individual, femtogram-sized particles in liquid samples. In this review, we consider the basic principles of combining optical trapping and confocal Raman spectroscopy, then survey the applications that have been developed through the combination of these techniques and their use in the analysis of particles dispersed in liquids.
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Affiliation(s)
- Daniel P Cherney
- Department of Chemistry, University of Utah, Salt Lake City, 84112, USA
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19
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Østergaard J, Moeller EH. Ghrelin-liposome interactions: Characterization of liposomal formulations of an acylated 28-amino acid peptide using CE. Electrophoresis 2010; 31:339-45. [DOI: 10.1002/elps.200900394] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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20
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Wiedmer SK, Lokajová J, Riekkola ML. Marker compounds for the determination of retention factors in EKC. J Sep Sci 2009; 33:394-409. [DOI: 10.1002/jssc.200900625] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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21
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Franzen U, Jorgensen L, Larsen C, Heegaard NHH, Østergaard J. Determination of liposome-buffer distribution coefficients of charged drugs by capillary electrophoresis frontal analysis. Electrophoresis 2009; 30:2711-9. [DOI: 10.1002/elps.200900013] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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22
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Muhonen J, Holopainen JM, Wiedmer SK. Interactions between local anesthetics and lipid dispersions studied with liposome electrokinetic capillary chromatography. J Chromatogr A 2009; 1216:3392-7. [PMID: 19251262 DOI: 10.1016/j.chroma.2009.02.028] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2008] [Revised: 02/06/2009] [Accepted: 02/10/2009] [Indexed: 11/26/2022]
Abstract
In the case of local anesthetic intoxication, intravenous administration of lipid-based Intralipid dispersion (Fresenius Kabi) can be used for the entrapment of hydrophobic drugs. Our long-term aim is to develop a sensitive, efficient, and non-harmful lipid-based formulation to specifically trap harmful substances. In this study liposome electrokinetic capillary chromatography (LEKC) was used to study the interactions between local anesthetics and Intralipid or liposome dispersions. Intralipid dispersion and extruded liposomes with different concentrations of 1-palmitoyl-2-oleyl-sn-glycerophosphatidylcholine (POPC), phosphatidylglycerol, cardiolipin, cholesterol, oleic acid, and linoleic acid were used as a pseudostationary phase in LEKC and their interactions with lidocaine, prilocaine, and bupivacaine were studied. POPC liposomes containing 1mol% of palmitoyl-2-[12-[(7-nitro-2-1,3-benzoxadiazol-4-yl)amino]dodecanoyl]-sn-glycero-3-phosphocholine as a fluorescent marker were used for the first time in LEKC connected with laser-induced fluorescent detection in order to calculate the retention factor for anesthetics.
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Affiliation(s)
- Jaana Muhonen
- Department of Chemistry, Laboratory of Analytical Chemistry, University of Helsinki, Helsinki, Finland
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24
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Antibiotic fusidic acid has strong interactions with negatively charged lipid membranes: An electrokinetic capillary chromatographic study. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2008; 1778:2640-7. [DOI: 10.1016/j.bbamem.2008.06.019] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/25/2008] [Revised: 06/24/2008] [Accepted: 06/25/2008] [Indexed: 10/21/2022]
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25
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Østergaard J, Jorgensen L, Engelbrecht Thomsen A, Weng Larsen S, Larsen C, Jensen H. Drug-liposome distribution phenomena studied by capillary electrophoresis-frontal analysis. Electrophoresis 2008; 29:3320-4. [DOI: 10.1002/elps.200700757] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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26
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Jiang Z, Reilly J, Everatt B. A method for rapidly predicting drug tissue distribution using surfactant vesicle electrokinetic chromatography. Electrophoresis 2008; 29:3674-84. [DOI: 10.1002/elps.200800236] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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27
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XIAN DL, HUANG KL, LIU SQ, XIAO JY. Quantitative Retention-Activity Relationship Studies by Liposome Electrokinetic Chromatography to Predict Skin Permeability. CHINESE J CHEM 2008. [DOI: 10.1002/cjoc.200890127] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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28
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Foley JP, Hong M, Polinko MA, Pascoe RJ, Ahuja ES. Compositional effects on electrophoretic and chromatographic figures of merit in electrokinetic chromatography with cetyltrimethylammonium bromide/sodium octyl sulfate vesicles as the pseudostationary phase. Part 1: Effect of the phase ratio. Electrophoresis 2008; 29:1180-8. [DOI: 10.1002/elps.200700809] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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29
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Xian D, Huang K, Liu S, Xiao J. Liposome Electrokinetic Chromatography: An in vitro Approach for Predicting Ecotoxicity. Chromatographia 2008. [DOI: 10.1365/s10337-008-0538-1] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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30
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Evaluation of Ferulic Acid-Biomembrane Interaction by Liposome Electrokinetic Chromatography. CHINESE JOURNAL OF ANALYTICAL CHEMISTRY 2007. [DOI: 10.1016/s1872-2040(07)60090-5] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Wang Y, Sun J, Liu H, He Z. Rapidly profiling blood–brain barrier penetration with liposome EKC. Electrophoresis 2007; 28:2391-5. [PMID: 17578839 DOI: 10.1002/elps.200600631] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
This report intended to study the potential of liposome EKC (LEKC) as a convenient and high-throughput screening tool to assess drug penetration across the blood-brain barrier (BBB). The retention factors (k) of 24 structurally diverse compounds were determined with LEKC and vesicle EKC (VEKC), respectively. Principal component analysis of the steady-state concentrations ratio of compounds in the brain and in the blood expressed as log BB, log k(LEKC), log k(VEKC), and other lipophilic descriptors including octanol/water partition coefficient (Clog P), octanol/water distribution coefficients (log D(7.4)), and polar surface area (PSA), showed the maximum similarity of partitioning processes in LEKC to drug penetration across the BBB. Furthermore, the log BB were correlated with the above five lipophilic descriptors, and the results showed that log k(LEKC) gave the better correlation coefficient (r(2) = 0.811, p <0.0001) than those of log D(7.4), Clog P, PSA, and log k(VEKC) (r(2) = 0.730, 0.672, 0.627, and 0.620, p <0.0001). This is the first report of the use of LEKC as a promising rapid tool to profile drug penetration across the BBB.
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Affiliation(s)
- Yongjun Wang
- Department of Biopharmaceutics, School of Pharmacy, Shenyang Pharmaceutical University, Shenyang, PR China
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32
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Wang Y, Sun J, Liu H, Wang Y, He Z. Prediction of Human Drug Absorption Using Liposome Electrokinetic Chromatography. Chromatographia 2007. [DOI: 10.1365/s10337-006-0140-3] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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33
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Zhou Y, Raphael RM. Solution pH alters mechanical and electrical properties of phosphatidylcholine membranes: relation between interfacial electrostatics, intramembrane potential, and bending elasticity. Biophys J 2006; 92:2451-62. [PMID: 17172308 PMCID: PMC1864824 DOI: 10.1529/biophysj.106.096362] [Citation(s) in RCA: 98] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Solution pH affects numerous biological processes and some biological membranes are exposed to extreme pH environments. We utilized micropipette aspiration of giant unilamellar vesicles composed of 1-stearoyl-2-oleoyl-phosphatidylcholine to characterize the effect of solution pH (2-9) on membrane mechanical properties. The elastic area compressibility modulus was unaffected between pH 3 and 9 but was reduced by approximately 30% at pH 2. Fluorescence experiments utilizing the phase-sensitive probe Laurdan confirmed gel-phase characteristics at pH 2, explaining the reduction of membrane elasticity. The membrane bending stiffness, kc, increased by approximately 40% at pH 4 and pH 9 over the control value at pH 6.5. Electrophoretic mobility measurements indicate that these changes are qualitatively consistent with theoretical models that predict the effect of membrane surface charge density and Debye length on kc, substantiating a coupling between the mechanical and interfacial electrical properties of the membrane. The effect of pH on intramembrane electrical properties was examined by studying the spectral shifts of the potentiometric probe di-8 ANEPPS. The intramembrane (dipole) potential (Psid) increased linearly as the solution pH decreased in a manner consistent with the partitioning of hydroxide ions into the membrane. However, changes in Psid did not correlate with changes in kc. These mechanical and electrical studies lead to the conclusion that the effect of pH on membrane bending stiffness results from alterations in interfacial, as opposed to intramembrane, electrostatics.
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Affiliation(s)
- Yong Zhou
- Department of Biochemistry and Cell Biology, Rice University, Houston, Texas, USA
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Luo H, Zheng C, Cheng YK. The retention properties of nucleobases in alkyl C8-/C18- and IAM-chromatographic systems in relation to log Pow. J Chromatogr B Analyt Technol Biomed Life Sci 2006; 847:245-61. [PMID: 17070738 DOI: 10.1016/j.jchromb.2006.10.009] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2006] [Revised: 09/05/2006] [Accepted: 10/09/2006] [Indexed: 10/24/2022]
Abstract
In order to evaluate the differences in the partition properties of 35 structurally congeneric nucleobases of biological interests in octanol-water biphasic, alkyl C(8)/C(18), and IAM systems, a comparative chromatographic study was performed. Comparing with the reversed-phase C(8)/C(18) retention data, most of the purines possessed weaker IAM retention except for those with specific H-bond and/or electrostatic interactions. Quantitative correlations between the experimental log P(ow) literature values and the IAM, C(8), and C(18) log k were evaluated (R(2)=0.943, 0.794, and 0.767, respectively). Although IAM retention correlated significantly better (larger R(2) value) with the log P(ow) values statistically, the latter was revealed apparently behaving more like (slope approaching unity) alkyl C(8)/C(18) retention and hence also has the same shortcoming in under-representing analytes capable of forming short-term H-bond/electrostatic interactions with polar head-groups of phospholipids. A chemically meaningful structure-retention model (q(2)=0.824 and R(2)=0.968) was derived, in which the hydrophobic interaction is identified as the underlying factor for the retention of purines in IAM system modulated non-trivially by H-bond/electrostatic interactions.
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Affiliation(s)
- Haibin Luo
- Department of Chemistry, Hong Kong Baptist University, Kowloon Tong, Hong Kong
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Bilek G, Kremser L, Blaas D, Kenndler E. Capillary electrophoresis of liposomes functionalized for protein binding. Electrophoresis 2006; 27:3999-4007. [PMID: 16983637 DOI: 10.1002/elps.200600087] [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: 11/11/2022]
Abstract
CE enabled assessing the attachment of hexa-histidine-tagged proteins to functionalized phospholipid liposomes. The liposomes were made of 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine, phosphatidyl-ethanolamine, cholesterol and distearoyl-glycero-3-phosphoethanolamine-N-methoxy(polyethylene glycol) in a molar ratio of 29:26:40:5. The unilamellar vesicles, which had an average diameter of 170 nm, were labelled by inclusion of FITC-dextran for fluorescence detection. CE was carried out in poly(vinyl alcohol) (PVA)-coated capillaries at 25 degrees C with a BGE consisting of Tris-HCl (50 mM, pH 8.0). For conjugation of the liposomes with the proteins (soluble synthetic receptor fragments with molecular mass of 60 and 70 kDa, respectively), Ni(2+) was implanted into the vesicle surface by an anchor lipid containing a nitrilotriacetate acid (NTA) group as complexation agent for the metal ions. The difference in surface charge enabled the separation of the different species of interest by CE: plain vesicles, vesicles functionalised with Ni-NTA, vesicle-protein complexes and the species formed upon removal of the Ni-ions by complexation with EDTA. Loss of the Ni-ions resulted in the release of the proteins and the reappearance of the plain Ni-free NTA-liposome species in the electropherograms.
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Affiliation(s)
- Gerhard Bilek
- Institute for Analytical Chemistry, University of Vienna, Vienna, Austria
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Bilek G, Kremser L, Blaas D, Kenndler E. Analysis of liposomes by capillary electrophoresis and their use as carrier in electrokinetic chromatography. J Chromatogr B Analyt Technol Biomed Life Sci 2006; 841:38-51. [PMID: 16682264 DOI: 10.1016/j.jchromb.2006.03.031] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2006] [Revised: 03/07/2006] [Accepted: 03/15/2006] [Indexed: 11/21/2022]
Abstract
This contribution reviews work about liposomes in the context of electrically driven separation methods in the capillary format. The discussion covers four topics. The one broaches the application of liposomes as pseudo-stationary phases or carriers in vesicle or liposome electrokinetic chromatography (EKC) in the way as microemulsions and micelles are used; it includes the chromatographic use of liposomal bilayers as stationary phases attached to the wall for capillary electrochromatography (CEC). The second topic is the characterization and separation of liposomes as analytes by capillary electrophoresis (CE). Then the determination of distribution coefficients and binding constants between liposomes and ligands is discussed, and finally work dealing with peptides and proteins are reviewed with lipid bilayers as constituents of the electrically driven separation system.
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Affiliation(s)
- Gerhard Bilek
- Institute for Analytical Chemistry, University of Vienna, Währingerstrasse 38, A-1090 Vienna, Austria
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