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Querard J, Gautier A, Le Saux T, Jullien L. Expanding discriminative dimensions for analysis and imaging. Chem Sci 2015; 6:2968-2978. [PMID: 28706678 PMCID: PMC5490003 DOI: 10.1039/c4sc03955f] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2014] [Accepted: 02/18/2015] [Indexed: 01/01/2023] Open
Abstract
OPTIMAL can discriminate – without any separation or washing step – a targeted photoswitchable probe used as labelling or titration contrast agent among various interfering compounds, photoswitchable or not.
Eliminating the contribution of interfering compounds is a key step in chemical analysis. In complex media, one possible approach is to perform a preliminary separation. However purification is often demanding, long, and costly; it may also considerably alter the properties of interacting components of the mixture (e.g. in a living cell). Hence there is a strong interest for developing separation-free non-invasive analytical protocols. Using photoswitchable probes as labelling and titration contrast agents, we demonstrate that the association of a modulated monochromatic light excitation with a kinetic filtering of the overall observable is much more attractive than constant excitation to read-out the contribution from a target probe under adverse conditions. An extensive theoretical framework enabled us to optimize the out-of-phase concentration first-order response of a photoswitchable probe to modulated illumination by appropriately matching the average light intensity and the radial frequency of the light modulation to the probe dynamics. Thus, we can selectively and quantitatively extract from an overall signal the contribution from a target photoswitchable probe within a mixture of species, photoswitchable or not. This simple titration strategy is more specifically developed in the context of fluorescence imaging, which offers promising perspectives.
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Affiliation(s)
- Jérôme Querard
- Ecole Normale Supérieure-PSL Research University , Département de Chimie , 24, rue Lhomond , F-75005 Paris , France . ; ; ; Tel: +33 4432 3333.,Sorbonne Universités , UPMC Univ Paris 06 , PASTEUR , F-75005 , Paris , France.,CNRS , UMR 8640 PASTEUR , F-75005 , Paris , France
| | - Arnaud Gautier
- Ecole Normale Supérieure-PSL Research University , Département de Chimie , 24, rue Lhomond , F-75005 Paris , France . ; ; ; Tel: +33 4432 3333.,Sorbonne Universités , UPMC Univ Paris 06 , PASTEUR , F-75005 , Paris , France.,CNRS , UMR 8640 PASTEUR , F-75005 , Paris , France
| | - Thomas Le Saux
- Ecole Normale Supérieure-PSL Research University , Département de Chimie , 24, rue Lhomond , F-75005 Paris , France . ; ; ; Tel: +33 4432 3333.,Sorbonne Universités , UPMC Univ Paris 06 , PASTEUR , F-75005 , Paris , France.,CNRS , UMR 8640 PASTEUR , F-75005 , Paris , France
| | - Ludovic Jullien
- Ecole Normale Supérieure-PSL Research University , Département de Chimie , 24, rue Lhomond , F-75005 Paris , France . ; ; ; Tel: +33 4432 3333.,Sorbonne Universités , UPMC Univ Paris 06 , PASTEUR , F-75005 , Paris , France.,CNRS , UMR 8640 PASTEUR , F-75005 , Paris , France
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Levesque M, Bénichou O, Voituriez R, Rotenberg B. Taylor dispersion with adsorption and desorption. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2012; 86:036316. [PMID: 23031022 DOI: 10.1103/physreve.86.036316] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/07/2012] [Indexed: 06/01/2023]
Abstract
We use a stochastic approach to show how Taylor dispersion is affected by kinetic processes of adsorption and desorption onto surfaces. A general theory is developed, from which we derive explicitly the dispersion coefficients of canonical examples such as Poiseuille flows in planar and cylindrical geometries, in both constant and sinusoidal velocity fields. These results open the way for the measurement of adsorption and desorption rate constants using stationary flows and molecular sorting using the stochastic resonance of the adsorption and desorption processes with the oscillatory velocity field.
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Granadero D, Bordello J, Pérez-Alvite MJ, Novo M, Al-Soufi W. Host-guest complexation studied by fluorescence correlation spectroscopy: adamantane-cyclodextrin inclusion. Int J Mol Sci 2010; 11:173-88. [PMID: 20162009 PMCID: PMC2820997 DOI: 10.3390/ijms11010173] [Citation(s) in RCA: 72] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2009] [Revised: 12/31/2009] [Accepted: 01/04/2010] [Indexed: 12/02/2022] Open
Abstract
The host-guest complexation between an Alexa 488 labelled adamantane derivative and beta-cyclodextrin is studied by Fluorescence Correlation Spectroscopy (FCS). A 1:1 complex stoichiometry and a high association equilibrium constant of K = 5.2 x 10(4) M(-1) are obtained in aqueous solution at 25 degrees C and pH = 6. The necessary experimental conditions are discussed. FCS proves to be an excellent method for the determination of stoichiometry and association equilibrium constant of this type of complexes, where both host and guest are nonfluorescent and which are therefore not easily amenable to standard fluorescence spectroscopic methods.
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Affiliation(s)
- Daniel Granadero
- Departamento de Química Física, Facultade de Ciencias, Universidade de Santiago de Compostela, E-27002 Lugo, Spain; E-Mails:
(D.G.);
(J.B.);
(M.N.)
| | - Jorge Bordello
- Departamento de Química Física, Facultade de Ciencias, Universidade de Santiago de Compostela, E-27002 Lugo, Spain; E-Mails:
(D.G.);
(J.B.);
(M.N.)
| | - Maria Jesus Pérez-Alvite
- Departamento de Química Orgánica, Facultade de Química, Universidade de Santiago de Compostela, E-15782 Santiago de Compostela, Spain; E-Mail:
(M.J.P-A.)
| | - Mercedes Novo
- Departamento de Química Física, Facultade de Ciencias, Universidade de Santiago de Compostela, E-27002 Lugo, Spain; E-Mails:
(D.G.);
(J.B.);
(M.N.)
| | - Wajih Al-Soufi
- Departamento de Química Física, Facultade de Ciencias, Universidade de Santiago de Compostela, E-27002 Lugo, Spain; E-Mails:
(D.G.);
(J.B.);
(M.N.)
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Oda Y, Matsuda S, Yamanoi T, Murota A, Katsuraya K. Identification of the inclusion complexation between phenyl β-d-(13C6)glucopyranoside and α-cyclodextrin using 2D 1H or 13C DOSY spectrum. Supramol Chem 2009. [DOI: 10.1080/10610270802709345] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
| | | | | | - Akihiko Murota
- b Department of Applied Chemistry , School of Science and Technology, Meiji University , Kanagawa, Japan
| | - Kaname Katsuraya
- c Department of Human Ecology , Wayo Women's University , Chiba, Japan
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Berthoumieux H, Jullien L, Lemarchand A. Temporal Modulation of a Spatially Periodic Potential for Kinetically Governed Oriented Motion. J Phys Chem B 2007; 111:2045-51. [PMID: 17269817 DOI: 10.1021/jp0669714] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
This theoretical paper introduces an experimental protocol derived from the concept of Brownian motors in order to selectively confer an oriented motion to given charged reactants. Instead of maintaining permanently the system in nonequilibrium conditions, we propose a simple experimental trick to restore periodically a transient out-of-equilibrium regime: the reactive medium is alternately submitted to a sawtooth potential and to a potential ramp. The model provides approximate analytical expressions for the operating conditions allowing us to design the extraction from a mixture of any desired reactant characterized by its rate constants. The orders of magnitude suggest a possible implementation in microsystems where the present approach could be used for separation and analysis.
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Affiliation(s)
- H Berthoumieux
- Ecole Normale Supérieure, Département de Chimie, UMR CNRS ENS Université Paris 6 8640 PASTEUR, 24, Rue Lhomond, 75231 Paris Cedex 05, France
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Park JW. Kinetics and Mechanism of Cyclodextrin Inclusion Complexation Incorporating Bidirectional Inclusion and Formation of Orientational Isomers. J Phys Chem B 2006; 110:24915-22. [PMID: 17149912 DOI: 10.1021/jp065238+] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The kinetics of cyclodextrin (CD) inclusion complexation has been usually analyzed in terms of a one-step reaction or a consecutive two-step reaction involving intracomplex structural transformation as a second step. These schemes presume the inclusion of guest molecules through only one side of the CD cavity and the formation of unidirectional CD complexes. However, there has been increasing experimental evidence for the inclusion of guests through both sides of the CD cavity and the formation of orientational isomers for noncentrosymmetric guest molecules. This article presents a novel parallel reaction scheme for CD inclusion complexation, incorporating bidirectional inclusion and the formation of orientational isomers into the scheme. It is shown that the parallel reaction scheme gives the same concentration versus reaction time relationship as the consecutive two-step reaction scheme. The experimental methods for determining the microscopic directional rate constants are presented. The kinetic parameters of the two-step reaction scheme are expressed as functions of the directional rate constants. The ratios of orientational isomers of alpha-CD-based [2]-pseudorotaxanes and the microscopic directional rate constants of the threading and dethreading reactions are estimated from the reported thermodynamic and kinetics data obtained by using either the one-step or two-step reaction scheme. It is shown that the thermodynamic preference of an isomer over the other is mainly due to the slow dethreading rate of the isomer.
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Affiliation(s)
- Joon Woo Park
- Department of Chemistry, Ewha Womans University, Seoul 120-750, Korea.
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Lemarchand A, Jullien L. Symmetry-Broken Reactant Motion upon Phase-Related Symmetrically Modulated Excitations: Application to Highly Selective Molecular Sorting. J Phys Chem A 2005; 109:5770-6. [PMID: 16833909 DOI: 10.1021/jp0509156] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
This paper introduces a separation protocol relying on affinity chromatography that exhibits unprecedented selectivities. We submit the mixture contained in the separative medium to the simultaneous action of two symmetrically modulated excitations. The first is a uniform periodic field (e.g., electric field) with zero mean value, whereas the second is the periodic modulation of a thermodynamic parameter such as the temperature. Under appropriate tuning of the modulations with the dynamics of the discriminating chemical reaction, we predict a symmetry breaking of molecular motion: the mixture components that are addressed by their rate constants exhibit an oriented motion for a particular phase relation between the modulations of the field and the thermodynamic parameter. The resulting velocity of the mixture components depends on the rate constants and on a conjugated thermodynamic value such as the standard enthalpy of the discrimination process in the case of a temperature modulation. In particular, it may be possible to separate mixture components with identical rate constants. We use the present approach to design a protocol to sort nucleic acids by their sequence.
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Affiliation(s)
- A Lemarchand
- Laboratoire de Physique Théorique des Liquides, Université Pierre et Marie Curie, C.N.R.S. U.M.R. 7600, 4, place Jussieu, 75252 Paris Cedex 05, France.
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