1
|
Ghasemi M, Jamadagni SN, Johnson ES, Larson RG. A Molecular Thermodynamic Model of Coacervation in Solutions of Polycations and Oppositely Charged Micelles. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2023; 39:10335-10351. [PMID: 37469275 DOI: 10.1021/acs.langmuir.3c00359] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/21/2023]
Abstract
To guide the rational design of personal care formulations, we formulate a molecular thermodynamic model that predicts coacervation from cationic polymers and mixed micelles containing neutral and anionic surfactants and added salt. These coacervates, which form as a result of dilution of conditioning shampoos during use, deposit conditioning agents and other actives to the scalp or skin and also provide lubrication benefits. Our model accounts for mixing entropy, hydrophobic interactions of polycation with water, free energies of bindings of oppositely charged groups to micelles and polycations, and electrostatic interactions that capture connectivity of charged groups on the polycation chain and the micelle. The model outputs are the compositions of surfactants, polycation, salt, and water in the coacervate and in its coexisting dilute phase, along with the binding fractions and coacervate volume fraction. We study the effects of overall composition (of surfactant, polycation, and added salt), charge fractions on micelles and polycations, and binding free energies on the phase diagram of coacervates. Then, we perform coacervation experiments for three systems: sodium dodecyl sulfate (SDS)-JR30M, sodium methyl cocoyl taurate (Taurate)-JR30M, and sodium lauryl alaninate (Alaninate)-JR30M, where JR30M is a cationic derivative of hydroxyethylcellulose (cat-HEC), and rationalize their coacervation data using our model. For comparison with experiment, we also develop a parametrization scheme to obtain the requisite binding energies and Flory-Huggins χ parameter. We find that our model predictions agree reasonably well with the experimental data, and that the sulfate-free surfactants of Taurate and Alaninate display much larger 2-phase regions compared to SDS with JR30M.
Collapse
Affiliation(s)
- Mohsen Ghasemi
- The Procter & Gamble Company, Mason, Ohio 45040, United States
| | | | - Eric S Johnson
- The Procter & Gamble Company, Mason, Ohio 45040, United States
| | - Ronald G Larson
- Department of Chemical Engineering, University of Michigan, Ann Arbor, Michigan 48109, United States
| |
Collapse
|
2
|
Rovnyak D, He J, Kong S, Eckenroad KW, Manley GA, Geffert RM, Krout MR, Strein TG. Determining sequential micellization steps of bile salts with multi-CMC modeling. J Colloid Interface Sci 2023; 644:496-508. [PMID: 37146486 DOI: 10.1016/j.jcis.2023.03.146] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2022] [Revised: 03/02/2023] [Accepted: 03/23/2023] [Indexed: 05/07/2023]
Abstract
HYPOTHESIS Bile salts exhibit complex concentration-dependent micellization in aqueous solution, rooted in a long-standing hypothesis of increasing size in bile aggregation that has historically focused on the measurement of only one CMC detected by a given method, without resolving successive stepwise aggregates. Whether bile aggregation is continuous or discrete, at what concentration does the first aggregate form, and how many aggregation steps occur, all remain as open questions. EXPERIMENTS Bile salt critical micelle concentrations (CMCs) were investigated with NMR chemical shift titrations and a multi-CMC phase separation modeling approach developed herein. The proposed strategy is to establish a correspondence of the phase separation and mass action models to treat the first CMC; subsequent micellization steps, involving larger micelles, are then treated as phase separation events. FINDINGS The NMR data and the proposed multi-CMC model reveal and resolve multiple closely spaced sequential preliminary, primary, and secondary discrete CMCs in dihydroxy and trihydroxy bile salt systems in basic (pH 12) solutions with a single model of one NMR data set. Complex NMR data are closely explained by the model. Four CMCs are established in deoxycholate below 100 mM (298 K, pH 12): 3.8 ± 0.5 mM, 9.1 ± 0.3 mM, 27 ± 2 mM, and 57 ± 4 mM, while three CMCs were observed in multiple bile systems, also under basic conditions. Global fitting leverages the sensitivity of different protons to different aggregation stages. In resolving these closely spaced CMCs, the method also obtains chemical shifts of these spectroscopically inaccessible (aka dark) states of the distinct micelles.
Collapse
Affiliation(s)
- David Rovnyak
- Dent Drive, Department of Chemistry, Bucknell University, Lewisburg, PA 17837, USA.
| | - Jiayi He
- University of Pennsylvania, Department of Chemistry, 231 S. 34 Street, Philadelphia, PA 19104-6323, USA.
| | - Sophie Kong
- Department of Pharmaceutical Chemistry, School of Pharmacy, University of California San Francisco, 1700 4th St, San Francisco, CA 94158, USA.
| | - Kyle W Eckenroad
- Bristol Myers Squibb, 1 Squibb Drive, 92-218 New Brunswick, NJ 08901, USA.
| | - Gregory A Manley
- AB SCIEX LLC, 500 Old Connecticut Path, Framingham, MA 01701, USA
| | - Raeanne M Geffert
- The University of North Carolina at Chapel Hill, UNC Eshelman School of Pharmacy, Division of Pharmacotherapy and Experimental Therapeutics, Kerr Hall, Campus Box 7569, Chapel Hill, NC 27599-7569, USA
| | - Michael R Krout
- Dent Drive, Department of Chemistry, Bucknell University, Lewisburg, PA 17837, USA.
| | - Timothy G Strein
- Dent Drive, Department of Chemistry, Bucknell University, Lewisburg, PA 17837, USA.
| |
Collapse
|
3
|
Sarolia J, Kumar D, Shah SA, Bahadur P, Tiwari S. Thermodynamics of pluronic 103 micellization in mannitol solution: Analyses based on isothermal titration calorimetry. Colloids Surf A Physicochem Eng Asp 2022. [DOI: 10.1016/j.colsurfa.2022.129240] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
4
|
The study of interactions between textile auxiliary polyelectrolytes by isothermal titration calorimetry. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2022.119286] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
|
5
|
Raschke S, Heuer A. Frame-guided assembly from a theoretical perspective. J Chem Phys 2022; 156:164905. [DOI: 10.1063/5.0084210] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The molecular self-assembly of various structures such as micelles and vesicles has been the subject of comprehensive studies. Recently, a new approach to design these structures, the frame-guided assembly, has been developed to progress towards fabrics of predefined shape and size, following an initially provided frame of guiding elements. Here we study frame-guided assembly into a two-dimensional membrane via computer simulations, based on a single-bead coarse grained surfactant model in continuous space. In agreement with the experiment the assembly process already starts for surfactant concentrations below the critical micelle concentration. Furthermore, upon increasing temperature the formation process gets more delocalized. Additionally, the assembly process of the resulting membrane plane is modelled by a lattice gas model. It displays a similar phenomenology but additionally allows the derivation of analytical mean-field predictions. In this way a fundamental understanding of frame-guided assembly can be gained.
Collapse
Affiliation(s)
- Simon Raschke
- Institute for Physical Chemistry, WWU Münster, Germany
| | - Andreas Heuer
- Physical Chemistry, Westfalische Wilhelms-Universitat Munster Fachbereich 12 Chemie und Pharmazie, Germany
| |
Collapse
|
6
|
Guerrero-Hernández L, Meléndez-Ortiz HI, Cortez-Mazatan GY, Vaillant-Sánchez S, Peralta-Rodríguez RD. Gemini and Bicephalous Surfactants: A Review on Their Synthesis, Micelle Formation, and Uses. Int J Mol Sci 2022; 23:1798. [PMID: 35163721 PMCID: PMC8836724 DOI: 10.3390/ijms23031798] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2021] [Revised: 11/30/2021] [Accepted: 12/03/2021] [Indexed: 12/14/2022] Open
Abstract
The use of surfactants in polymerization reactions is particularly important, mainly in emulsion polymerizations. Further, micelles from biocompatible surfactants find use in pharmaceutical dosage forms. This paper reviews recent developments in the synthesis of novel gemini and bicephalous surfactants, micelle formation, and their applications in polymer and nanoparticle synthesis, oil recovery, catalysis, corrosion, protein binding, and biomedical area, particularly in drug delivery.
Collapse
Affiliation(s)
- Lluvia Guerrero-Hernández
- Centro de Investigación en Química Aplicada, Blvd. Enrique Reyna No. 140, Col. San José de los Cerritos, Saltillo 25294, Mexico; (L.G.-H.); (G.Y.C.-M.); (S.V.-S.)
| | - Héctor Iván Meléndez-Ortiz
- CONACyT—Centro de Investigación en Química Aplicada, Blvd. Enrique Reyna No. 140, Col. San José de los Cerritos, Saltillo 25294, Mexico
| | - Gladis Y. Cortez-Mazatan
- Centro de Investigación en Química Aplicada, Blvd. Enrique Reyna No. 140, Col. San José de los Cerritos, Saltillo 25294, Mexico; (L.G.-H.); (G.Y.C.-M.); (S.V.-S.)
| | - Sandra Vaillant-Sánchez
- Centro de Investigación en Química Aplicada, Blvd. Enrique Reyna No. 140, Col. San José de los Cerritos, Saltillo 25294, Mexico; (L.G.-H.); (G.Y.C.-M.); (S.V.-S.)
| | - René D. Peralta-Rodríguez
- Centro de Investigación en Química Aplicada, Blvd. Enrique Reyna No. 140, Col. San José de los Cerritos, Saltillo 25294, Mexico; (L.G.-H.); (G.Y.C.-M.); (S.V.-S.)
| |
Collapse
|
7
|
Physicochemical study on molecular interactions of the active pharmaceutical ingredient ionic liquid domiphen salicylate with amino acids at different temperatures. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2021.117072] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
|
8
|
Importance of Conjugation of the Bile Salt on the Mechanism of Lipolysis. Molecules 2021; 26:molecules26195764. [PMID: 34641309 PMCID: PMC8510408 DOI: 10.3390/molecules26195764] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2021] [Revised: 09/08/2021] [Accepted: 09/13/2021] [Indexed: 12/17/2022] Open
Abstract
We aim to advance the discussion on the significance of the conjugation of bile salts (BS) in our organism. We hypothesize that conjugation influences the rate of lipolysis. Since the rate of lipolysis is a compound parameter, we compare the effect of conjugation on four surface parameters, which contribute to the rate. Since deconjugation is due to gut microbiota, we hypothesize that microbiota may affect the rate of lipolysis. A meta-analysis of literature data of critical micelle concentration, β, aggregation number, and molar solubilization ratio has been performed for the first time. In addition, critical micelle concentration (CMC), interfacial tension, and lipolysis rate measurements were performed. It was found that the unconjugated BS in mixed micelles increases the antagonism between the BS, therefore, increasing the CMC. This correlated with the effect of unconjugated BS on the solubilization capacity of mixed micelles. The collected literature information indicates that the role of the BS and its conjugation in our organism is a key factor influencing the functioning of our organism, where too high levels of unconjugated BS may lead to malabsorption of fat-soluble nutrients. The experimental lipolysis results irrevocably showed that conjugation is a significant factor influencing the rate.
Collapse
|
9
|
Liu J, Chen C, Wei T, Gayet O, Loncle C, Borge L, Dusetti N, Ma X, Marson D, Laurini E, Pricl S, Gu Z, Iovanna J, Peng L, Liang X. Dendrimeric nanosystem consistently circumvents heterogeneous drug response and resistance in pancreatic cancer. EXPLORATION (BEIJING, CHINA) 2021; 1:21-34. [PMID: 37366462 PMCID: PMC10291567 DOI: 10.1002/exp.20210003] [Citation(s) in RCA: 61] [Impact Index Per Article: 15.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/07/2021] [Accepted: 05/25/2021] [Indexed: 06/28/2023]
Abstract
Pancreatic ductal adenocarcinoma (PDAC) is a deadly cancer with no efficacious treatment. The application of nanomedicine is expected to bring new hope to PDAC treatment. In this study, we report a novel supramolecular dendrimeric nanosystem carrying the anticancer drug doxorubicin, which demonstrated potent anticancer activity, markedly overcoming the heterogeneity of drug response and resistance of primary cultured tumor cells derived from PDAC patients. This dendrimer nanodrug was constructed with a fluorinated amphiphilic dendrimer, which self-assembled into micelles nanostructure and encapsulated doxorubicin with high loading. Because of the fine nanosize, stable formulation and acid-promoted drug release, this dendrimeric nanosystem effectively accumulated in tumor, with deep penetration in tumor tissue and rapid drug uptake/release profile in cells, ultimately resulting in potent anticancer activity and complete suppression of tumor growth in patient-derived xenografts. Most importantly, this dendrimer nanodrug generated uniform and effective response when treating 35 primary pancreatic cancer cell lines issued from patient samples as a robust platform for preclinical drug efficacy testing. In addition, this dendrimer nanodrug formulation was devoid of adverse effects and showed excellent tolerability. Given all these uniquely advantageous features, this simple and convenient dendrimer nanodrug holds great promise as a potential candidate to treat the deadly PDAC.
Collapse
Affiliation(s)
- Juan Liu
- CNRS, Centre Interdisciplinaire de Nanoscience de Marseille, UMR 7325, Equipe Labellisée Ligue Contre le CancerAix‐Marseille UniversitéMarseilleFrance
- Laboratory of Controllable NanopharmaceuticalsChinese Academy of Sciences (CAS) Center for Excellence in NanoscienceBeijingChina
- CAS Key Laboratory for Biomedical Effects of Nanomaterials and NanosafetyNational Center for Nanoscience and Technology of ChinaBeijingChina
- University of Chinese Academy of SciencesBeijingChina
- Hepato‐Pancreato‐Biliary Center, Beijing Tsinghua Changgung Hospital, School of MedicineTsinghua UniversityBeijingChina
| | - Chao Chen
- CNRS, Centre Interdisciplinaire de Nanoscience de Marseille, UMR 7325, Equipe Labellisée Ligue Contre le CancerAix‐Marseille UniversitéMarseilleFrance
| | - Tuo Wei
- CNRS, Centre Interdisciplinaire de Nanoscience de Marseille, UMR 7325, Equipe Labellisée Ligue Contre le CancerAix‐Marseille UniversitéMarseilleFrance
- Laboratory of Controllable NanopharmaceuticalsChinese Academy of Sciences (CAS) Center for Excellence in NanoscienceBeijingChina
- CAS Key Laboratory for Biomedical Effects of Nanomaterials and NanosafetyNational Center for Nanoscience and Technology of ChinaBeijingChina
- University of Chinese Academy of SciencesBeijingChina
| | - Odile Gayet
- Centre de Recherche en Cancérologie de Marseille, INSERM, UMR1068MarseilleFrance
| | - Céline Loncle
- Centre de Recherche en Cancérologie de Marseille, INSERM, UMR1068MarseilleFrance
| | - Laurence Borge
- Centre de Recherche en Cancérologie de Marseille, INSERM, UMR1068MarseilleFrance
| | - Nelson Dusetti
- Centre de Recherche en Cancérologie de Marseille, INSERM, UMR1068MarseilleFrance
| | - Xiaowei Ma
- Laboratory of Controllable NanopharmaceuticalsChinese Academy of Sciences (CAS) Center for Excellence in NanoscienceBeijingChina
- CAS Key Laboratory for Biomedical Effects of Nanomaterials and NanosafetyNational Center for Nanoscience and Technology of ChinaBeijingChina
- University of Chinese Academy of SciencesBeijingChina
| | - Domenico Marson
- Molecular Biology and Nanotechnology Laboratory (MolBNL@UniTS), DEAUniversity of TriesteTriesteItaly
| | - Erik Laurini
- Molecular Biology and Nanotechnology Laboratory (MolBNL@UniTS), DEAUniversity of TriesteTriesteItaly
| | - Sabrina Pricl
- Molecular Biology and Nanotechnology Laboratory (MolBNL@UniTS), DEAUniversity of TriesteTriesteItaly
- Department of General Biophysics, Faculty of Biology and Environmental ProtectionUniversity of LodzLodzPoland
| | - Zhongwei Gu
- National Engineering Research Center for BiomaterialsSichuan UniversityChengduChina
| | - Juan Iovanna
- Centre de Recherche en Cancérologie de Marseille, INSERM, UMR1068MarseilleFrance
| | - Ling Peng
- CNRS, Centre Interdisciplinaire de Nanoscience de Marseille, UMR 7325, Equipe Labellisée Ligue Contre le CancerAix‐Marseille UniversitéMarseilleFrance
| | - Xing‐Jie Liang
- Laboratory of Controllable NanopharmaceuticalsChinese Academy of Sciences (CAS) Center for Excellence in NanoscienceBeijingChina
- CAS Key Laboratory for Biomedical Effects of Nanomaterials and NanosafetyNational Center for Nanoscience and Technology of ChinaBeijingChina
- University of Chinese Academy of SciencesBeijingChina
| |
Collapse
|
10
|
Vázquez-Tato MP, Seijas JA, Meijide F, Fraga F, de Frutos S, Miragaya J, Trillo JV, Jover A, Soto VH, Vázquez Tato J. Highly Hydrophilic and Lipophilic Derivatives of Bile Salts. Int J Mol Sci 2021; 22:6684. [PMID: 34206572 PMCID: PMC8268814 DOI: 10.3390/ijms22136684] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2021] [Revised: 06/15/2021] [Accepted: 06/18/2021] [Indexed: 11/30/2022] Open
Abstract
Lipophilicity of 15 derivatives of sodium cholate, defined by the octan-1-ol/water partition coefficient (log P), has been theoretically determined by the Virtual log P method. These derivatives bear highly hydrophobic or highly hydrophilic substituents at the C3 position of the steroid nucleus, being linked to it through an amide bond. The difference between the maximum value of log P and the minimum one is enlarged to 3.5. The partition coefficient and the critical micelle concentration (cmc) are tightly related by a double-logarithm relationship (VirtuallogP=-(1.00±0.09)log(cmcmM)+(2.79±0.09)), meaning that the Gibbs free energies for the transfer of a bile anion from water to either a micelle or to octan-1-ol differ by a constant. The equation also means that cmc can be used as a measurement of lipophilicity. The demicellization of the aggregates formed by three derivatives of sodium cholate bearing bulky hydrophobic substituents has been studied by surface tension and isothermal titration calorimetry. Aggregation numbers, enthalpies, free energies, entropies, and heat capacities, ΔCP,demic, were obtained. ΔCP,demic, being positive, means that the interior of the aggregates is hydrophobic.
Collapse
Affiliation(s)
- M. Pilar Vázquez-Tato
- Departamento de Química Orgánica, Facultad de Ciencias, Universidad de Santiago de Compostela, Avda. Alfonso X El Sabio s/n, 27002 Lugo, Spain; (M.P.V.-T.); (J.A.S.)
| | - Julio A. Seijas
- Departamento de Química Orgánica, Facultad de Ciencias, Universidad de Santiago de Compostela, Avda. Alfonso X El Sabio s/n, 27002 Lugo, Spain; (M.P.V.-T.); (J.A.S.)
| | - Francisco Meijide
- Departamento de Química Física, Facultad de Ciencias, Universidad de Santiago de Compostela, Avda. Alfonso X El Sabio s/n, 27002 Lugo, Spain; (F.M.); (S.d.F.); (J.M.); (J.V.T.); (A.J.)
| | - Francisco Fraga
- Departamento de Física Aplicada, Facultad de Ciencias, Universidad de Santiago de Compostela, Avda. Alfonso X El Sabio s/n, 27002 Lugo, Spain;
| | - Santiago de Frutos
- Departamento de Química Física, Facultad de Ciencias, Universidad de Santiago de Compostela, Avda. Alfonso X El Sabio s/n, 27002 Lugo, Spain; (F.M.); (S.d.F.); (J.M.); (J.V.T.); (A.J.)
| | - Javier Miragaya
- Departamento de Química Física, Facultad de Ciencias, Universidad de Santiago de Compostela, Avda. Alfonso X El Sabio s/n, 27002 Lugo, Spain; (F.M.); (S.d.F.); (J.M.); (J.V.T.); (A.J.)
| | - Juan Ventura Trillo
- Departamento de Química Física, Facultad de Ciencias, Universidad de Santiago de Compostela, Avda. Alfonso X El Sabio s/n, 27002 Lugo, Spain; (F.M.); (S.d.F.); (J.M.); (J.V.T.); (A.J.)
| | - Aida Jover
- Departamento de Química Física, Facultad de Ciencias, Universidad de Santiago de Compostela, Avda. Alfonso X El Sabio s/n, 27002 Lugo, Spain; (F.M.); (S.d.F.); (J.M.); (J.V.T.); (A.J.)
| | - Victor H. Soto
- Escuela de Química, Centro de Investigación en Electroquímica y Energía Química (CELEQ), Universidad de Costa Rica, San José 11501-2060, Costa Rica;
| | - José Vázquez Tato
- Departamento de Química Física, Facultad de Ciencias, Universidad de Santiago de Compostela, Avda. Alfonso X El Sabio s/n, 27002 Lugo, Spain; (F.M.); (S.d.F.); (J.M.); (J.V.T.); (A.J.)
| |
Collapse
|
11
|
A Source of Systematic Errors in the Determination of Critical Micelle Concentration and Micellization Enthalpy by Graphical Methods in Isothermal Titration Calorimetry. ENTROPY 2021; 23:e23020236. [PMID: 33670582 PMCID: PMC7922405 DOI: 10.3390/e23020236] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/19/2021] [Revised: 02/04/2021] [Accepted: 02/06/2021] [Indexed: 12/02/2022]
Abstract
Isothermal titration calorimetry is frequently employed to determine the critical micelle concentration and the micellization enthalpy of surfactants in terms of geometrical characteristics of the titration curves. Previously we have shown theoretically that even for an infinitesimal injection, the heat per titrant mol depends on the stock solution concentration. In this work, we explore experimentally the influence of the stock solution concentration on the geometrical characteristics of the titration curve and its effect in determining the critical micelle concentration and the micellization enthalpy of surfactants. The systematic study of this phenomenology involves a great number of measurements at different temperatures with several repetitions carried out using a robotic calorimeter. As surfactant hexadecyltrimethylamonium bromide was used. The magnitude and shape of the heat titration depend on the stock solution concentration. As a consequence, the inflexion-point, break-point, and step-height decrease until a limiting value. A qualitative analysis suggests that the limiting value depends only on substance. This work shows that graphical methods could not be suitable for the calculation of the critical micelle concentration and micellization enthalpy because the magnitude and shape of the titration curve depend on the stock solution concentration. Micellar properties should be calculated by the application of theoretical models as in the ligand-binding studies.
Collapse
|
12
|
ITC for Characterization of Self-Assembly Process of Cationic Dendrons for siRNA Delivery. Methods Mol Biol 2021; 2282:245-266. [PMID: 33928580 DOI: 10.1007/978-1-0716-1298-9_15] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
siRNAs are emerging as promising therapeutic agents due to their ability to inhibit specific genes in many diseases. However, these tools require specific vehicles in order to be safely delivered to the targeted site. Among different siRNA delivery systems, self-assembled nanomicelles based on amphiphilic cationic dendrons (ACDs) have recently outperformed nanovectors based on covalent carriers. This chapter describes how isothermal titration calorimetry (ITC) can be exploited as one of the best techniques to investigate the self-assembly process of ACDs. Specifically, ITC can provide, as such or via specific analysis methods, a full thermodynamic characterization of these nanomicelles, including their critical micellar concentration, micelle aggregation number, degree of counterion binding, Gibbs free energy of micellization, and its enthalpic and entropic components.
Collapse
|
13
|
Mencia G, Lozano-Cruz T, Valiente M, Jiménez JL, de la Mata FJ, Muñoz-Fernández M, Cano J, Gillies E, Gómez R. Evaluation of pH-dependent amphiphilic carbosilane dendrons in micelle formation, drug loading and HIV-1 infection. Org Biomol Chem 2020; 18:9639-9652. [PMID: 33206746 DOI: 10.1039/d0ob01867h] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
New amphiphilic carbosilane dendrons with pH-dependent behaviour based on the presence of carboxylate (propionate or succinate) groups at their peripheries and a fatty acid at the focal point were developed. In the presence of salts, they were able to form micelles with critical aggregation concentrations increasing with increasing dendron generation. Their thermodynamic parameters were calculated from surface tension measurements and their diameters at different pHs were measured by dynamic light scattering. These micelles were stable at basic pH but degraded under acidic conditions. No significant differences were found for the propionate and succinate based dendron micelles at basic or acidic pH, but the succinate dendron assemblies were more stable at neutral pH. The properties of these systems as drug nano-carriers were studied using both hydrophilic and hydrophobic molecules, and the drug loading varied with the structure and charge of the drug. In addition, due to the presence of multiple negative charges, the dendrons exhibited anti-HIV activity. Higher generation dendrons with more peripheral carboxylates that were not assembled into micelles were more active than micelles composed of lower generation dendrons having fewer peripheral carboxylates.
Collapse
Affiliation(s)
- Gabriel Mencia
- Department of Organic and Inorganic Chemistry, and Research Institute in Chemistry "Andrés M. Del Río" (IQAR), University of Alcalá, Madrid, Spain.
| | | | | | | | | | | | | | | | | |
Collapse
|
14
|
Łudzik K, Woloszczuk S, Zając W, Jazdzewska M, Rogachev A, Kuklin AI, Zawisza A, Jóźwiak M. Can the Isothermal Calorimetric Curve Shapes Suggest the Structural Changes in Micellar Aggregates? Int J Mol Sci 2020; 21:ijms21165828. [PMID: 32823747 PMCID: PMC7461569 DOI: 10.3390/ijms21165828] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2020] [Revised: 08/08/2020] [Accepted: 08/11/2020] [Indexed: 11/30/2022] Open
Abstract
Inspired by the unusual shapes of the titration curve observed for many surfactants and mixed colloidal systems, we decided to extend the analysis to isothermal titration calorimetric curves (ITC) by paying special attention to potential structural changes in micellar aggregates. In this paper, we used isothermal titration calorimetry in conjunction with Scanning Transmission Electron Microscopy (STEM), Small-Angle Neutron Scattering (SANS) and X-ray Scattering (SAXS) methods support by Monte Carlo and semiempirical quantum chemistry simulations to confirm if the isothermal calorimetric curve shape can reflect micelle transition phenomena. For that purpose, we analysed, from the thermodynamic point of view, a group of cationic gemini surfactants, alkanediyl-α,ω-bis(dimethylalkylammonium) bromides. We proposed the shape of aggregates created by surfactant molecules in aqueous solutions and changes thereof within a wide temperature range. The results provide evidence for the reorganization processes and the relationship (dependence) between the morphology of the created aggregates and the conditions such as temperature, surfactant concentration and spacer chain length which affect the processes.
Collapse
Affiliation(s)
- Katarzyna Łudzik
- Department of Physical Chemistry, University of Lodz, 90-236 Lodz, Poland;
- Frank Laboratory of Neutron Physics, Joint Institute for Nuclear Research, 141980 Dubna, Russia; (M.J.); (A.R.); (A.I.K.)
- Correspondence:
| | | | - Wojciech Zając
- The Henryk Niewodniczański Institute of Nuclear Physics, Polish Academy of Sciences, 31-342 Cracow, Poland;
| | - Monika Jazdzewska
- Frank Laboratory of Neutron Physics, Joint Institute for Nuclear Research, 141980 Dubna, Russia; (M.J.); (A.R.); (A.I.K.)
- Faculty of Physics, Adam Mickiewicz University, 61-614 Poznan, Poland;
| | - Andrey Rogachev
- Frank Laboratory of Neutron Physics, Joint Institute for Nuclear Research, 141980 Dubna, Russia; (M.J.); (A.R.); (A.I.K.)
- Moscow Institute of Physics and Technology, 9 Institutskiy per. 141701 Dolgoprudny, Russia
| | - Alexander Ivanowicz Kuklin
- Frank Laboratory of Neutron Physics, Joint Institute for Nuclear Research, 141980 Dubna, Russia; (M.J.); (A.R.); (A.I.K.)
- Moscow Institute of Physics and Technology, 9 Institutskiy per. 141701 Dolgoprudny, Russia
| | - Anna Zawisza
- Department of Organic and Applied Chemistry, University of Lodz, 91-403 Lodz Poland;
| | - Małgorzata Jóźwiak
- Department of Physical Chemistry, University of Lodz, 90-236 Lodz, Poland;
| |
Collapse
|
15
|
|
16
|
Wang M, Fang T, Zhong H, Li J, Yan Y, Zhang J. Optimal aggregation number of reverse micelles in supercritical carbon dioxide: a theoretical perspective. SOFT MATTER 2019; 15:3323-3329. [PMID: 30924475 DOI: 10.1039/c8sm02299b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
The aggregation number is one of the most fundamental and important structural parameters for the micelle or reverse micelle (RM) system. In this work, a simple, reliable method for the determination of the aggregation number of RMs in supercritical CO2 (scCO2) was presented through a molecular dynamics simulation. The process of pulling surfactants out of the RMs one by one was performed to calculate the aggregation number. The free energies of RMs with different numbers of surfactants were calculated through this process. We found an RM with the lowest free energy, which was considered to have the optimal number of surfactants. Therefore, the optimal aggregation number of RMs was acquired. In order to explain the existence of an optimal aggregation number, detailed analyses of surfactant accumulation were conducted by combining molecular dynamics with quantum chemistry methods. The results indicated that in the RMs with the lowest free energy, the head-group and tail-terminal of the surfactants accumulated on an equipotential surface. In this case, the surfactant film could effectively separate water and CO2; thus, the lowest free energy was expected. This method determined the aggregation number of RMs by theoretical calculations that did not depend on experimental measurements. This presented approach facilitates the evaluation of the characteristics of RMs in scCO2 and can be further applied in the RM system of organic solvents or even in the micellar system.
Collapse
Affiliation(s)
- Muhan Wang
- School of Materials Science and Engineering, China University of Petroleum, 266580 Qingdao, Shandong, China.
| | | | | | | | | | | |
Collapse
|
17
|
Rennie ML, Crowley PB. A Thermodynamic Model of Auto‐regulated Protein Assembly by a Supramolecular Scaffold. Chemphyschem 2019; 20:1011-1017. [DOI: 10.1002/cphc.201900153] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2019] [Indexed: 01/16/2023]
Affiliation(s)
- Martin L. Rennie
- School of ChemistryNational University of Ireland Galway University Road Galway Ireland
- Present address: Institute of Molecular Cell and System BiologyUniversity of Glasgow University Avenue Glasgow UK
| | - Peter B. Crowley
- School of ChemistryNational University of Ireland Galway University Road Galway Ireland
| |
Collapse
|
18
|
Shokry DS, Waters LJ, Parkes GMB, Mitchell JC. Prediction of human intestinal absorption using micellar liquid chromatography with an aminopropyl stationary phase. Biomed Chromatogr 2019; 33:e4515. [PMID: 30811616 DOI: 10.1002/bmc.4515] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2018] [Revised: 01/22/2019] [Accepted: 02/18/2019] [Indexed: 11/08/2022]
Abstract
The extent of human intestinal absorption (HIA) for a drug is considered to be an important pharmacokinetic parameter which must be determined for orally administered drugs. Traditional experimental methods relied upon animal testing and are renowned for being time consuming and expensive as well as being ethically unfavourable. As a result, the development of alternative methods to evaluate a drug's pharmacokinetics is crucial. Micellar liquid chromatography is considered to be one of these methods that can replace the use of animals in the prediction of HIA. In this study, the combination of an aminopropyl column with the biosurfactant sodium deoxycholate bile salt was used in the experimental determination of micelle-water partition coefficients (log Pmw ) for a group of compounds. Multiple linear regression was then used for the prediction of HIA using the experimentally determined log Pmw along with other molecular descriptors, leading to the construction of a model equation of R2 = 85% and a prediction power represented by R2 Pred. = 72%. The use of micellar liquid chromatography with an aminopropyl column in combination with sodium deoxycholate was found to be a good method for the prediction of human intestinal absorption, providing data for a far wider range of compounds compared with previous studies.
Collapse
Affiliation(s)
- Dina S Shokry
- School of Engineering and Science, Medway Centre for Pharmaceutical Science, University of Greenwich, Chatham, Kent, UK
| | - Laura J Waters
- School of Applied Sciences, University of Huddersfield, Queensgate, Huddersfield, UK
| | - Gareth M B Parkes
- School of Applied Sciences, University of Huddersfield, Queensgate, Huddersfield, UK
| | - John C Mitchell
- School of Engineering and Science, Medway Centre for Pharmaceutical Science, University of Greenwich, Chatham, Kent, UK
| |
Collapse
|
19
|
Abstract
Surfactants are ubiquitous in cellular membranes, detergents or as emulsification agents. Due to their amphiphilic properties, they cannot only mediate between two domains of very different solvent compatibility like water and organic but also show fascinating self-assembly features resulting in micelles, vesicles, or lyotropic liquid crystals. The current review article highlights some approaches towards the next generation surfactants, for example, those with catalytically active heads. Furthermore, it is shown that amphiphilic properties can be obtained beyond the classical hydrophobic-hydrophilic interplay, for instance with surfactants containing one molecular block with a special shape. Whereas, classical surfactants are static, researchers have become more interested in species that are able to change their properties depending on external triggers. The article discusses examples for surfactants sensitive to chemical (e.g., pH value) or physical triggers (temperature, electric and magnetic fields).
Collapse
Affiliation(s)
- Sebastian Polarz
- Department of ChemistryUniversity of KonstanzUniversitätsstrasse 1078457KonstanzGermany
| | - Marius Kunkel
- Department of ChemistryUniversity of KonstanzUniversitätsstrasse 1078457KonstanzGermany
| | - Adrian Donner
- Department of ChemistryUniversity of KonstanzUniversitätsstrasse 1078457KonstanzGermany
| | - Moritz Schlötter
- Department of ChemistryUniversity of KonstanzUniversitätsstrasse 1078457KonstanzGermany
| |
Collapse
|
20
|
Fernandez-Alvarez R, Medoš Ž, Tošner Z, Zhigunov A, Uchman M, Hervø-Hansen S, Lund M, Bešter-Rogač M, Matějíček P. Total Description of Intrinsic Amphiphile Aggregation: Calorimetry Study and Molecular Probing. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:14448-14457. [PMID: 30343575 DOI: 10.1021/acs.langmuir.8b03462] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Isothermal titration calorimetry (ITC) is an apt tool for a total thermodynamic description of self-assembly of atypical amphiphiles such as anionic boron cluster compounds (COSAN) in water. Global fitting of ITC enthalpograms reveals remarkable features that differentiate COSAN from classical amphiphiles: (i) strong enthalpy and weak entropy contribution to the free energy of aggregation, (ii) low degree of counterion binding, and (iii) very low aggregation number, leading to deviations from the ideal closed association model. The counterion condensation obtained from the thermodynamic model was compared with the results of 7Li DOSY NMR of Li[COSAN] micelles, which allows direct tracking of Li cations. The basic thermodynamic study of COSAN alkaline salt aggregation was complemented by NMR and ITC experiments in dilute Li/NaCl and acetonitrile aqueous solutions of COSAN. The strong affinity of acetonitrile molecules to COSAN clusters was microscopically investigated by all-atomic molecular dynamics simulations. The impact of ionic strength on COSAN self-assembling was comparable to the behavior of classical amphiphiles, whereas even a small amount of acetonitrile cosolvent has a pronounced nonclassical character of COSAN aggregation. It demonstrates that large self-assembling changes are triggered by traces of organic solvents.
Collapse
Affiliation(s)
| | - Žiga Medoš
- Faculty of Chemistry and Chemical Technology , University of Ljubljana , Večna pot 113 , SI-1000 Ljubljana , Slovenia
| | | | - Alexander Zhigunov
- Institute of Macromolecular Chemistry, v.v.i. , Academy of Sciences of the Czech Republic , Heyrovský Sq. 2 , 16206 Prague 6 , Czechia
| | | | - Stefan Hervø-Hansen
- Division of Theoretical Chemistry , University of Lund , P.O. Box 124, SE-22100 Lund , Sweden
| | - Mikael Lund
- Division of Theoretical Chemistry , University of Lund , P.O. Box 124, SE-22100 Lund , Sweden
| | - Marija Bešter-Rogač
- Faculty of Chemistry and Chemical Technology , University of Ljubljana , Večna pot 113 , SI-1000 Ljubljana , Slovenia
| | | |
Collapse
|
21
|
Lu Y, Zhang E, Yang J, Cao Z. Strategies to improve micelle stability for drug delivery. NANO RESEARCH 2018; 11:4985-4998. [PMID: 30370014 PMCID: PMC6201237 DOI: 10.1007/s12274-018-2152-3] [Citation(s) in RCA: 284] [Impact Index Per Article: 40.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/22/2018] [Revised: 07/10/2018] [Accepted: 07/13/2018] [Indexed: 05/22/2023]
Abstract
Micelles have been studied as drug delivery carriers for decades. Their use can potentially result in high drug accumulation at the target site through the enhanced permeability and retention effect. Nevertheless, the lack of stability of micelles in the physiological environment limits their efficacy as a drug carrier. In particular, micelles tend to disassociate and prematurely release the encapsulated drugs, lowering delivery efficacy and creating toxicity concerns. Many efforts to enhance the stability of micelles have focused mainly on decreasing the critical micelle forming concentration and improving blood circulation. Herein, we review different strategies including crosslinking and non-crosslinking approaches designed to stabilize micelles and offer perspectives on future research directions.
Collapse
Affiliation(s)
- Yang Lu
- Department of Chemical Engineering and Materials Science, Wayne State University, Detroit 48202, MI, USA
| | - Ershuai Zhang
- Department of Chemical Engineering and Materials Science, Wayne State University, Detroit 48202, MI, USA
| | - Jianhai Yang
- Department of Chemical Engineering and Materials Science, Wayne State University, Detroit 48202, MI, USA
| | - Zhiqiang Cao
- Department of Chemical Engineering and Materials Science, Wayne State University, Detroit 48202, MI, USA
| |
Collapse
|
22
|
Kwasny MT, Zhu L, Hickner MA, Tew GN. Thermodynamics of Counterion Release Is Critical for Anion Exchange Membrane Conductivity. J Am Chem Soc 2018; 140:7961-7969. [PMID: 29901997 DOI: 10.1021/jacs.8b03979] [Citation(s) in RCA: 47] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
As the field of anion exchange membranes (AEMs) employs an increasing variety of cations, a critical understanding of cation properties must be obtained, especially as they relate to membrane ion conductivity. Here, to elucidate such properties, metal cation-based AEMs, featuring bis(norbornene) nickel, ruthenium, or cobalt complexes, were synthesized and characterized. In addition, isothermal titration calorimetry (ITC) was used to probe counterion exchange thermodynamics in order to understand previously reported differences in conductivity. The ion conductivity data reported here further demonstrated that nickel-complex cations had higher conductivity as compared to their ruthenium and cobalt counterparts. Surprisingly, bulk hydration number, ion concentration, ion exchange capacity, and activation energy were not sufficient to explain differences in conductivity, so the thermodynamics of metal cation-counterion association were explored using ITC. Specifically, for the nickel cation as compared to the other two metal-based cations, a larger thermodynamic driving force for chloride counterion release was observed, shown through a smaller Δ Htot for counterion exchange, which indicated weaker cation-counterion association. The use of ITC to study cation-counterion association was further exemplified by characterizing more traditional AEM cations, such as quaternary ammoniums and an imidazolium cation, which demonstrated small variances in their enthalpic response, but an overall Δ Htot similar to that of the nickel-based cation. The cation hydration, rather than its hydration shell or the bulk hydration of the membrane, likely played the key role in determining the strength of the initial cation-counterion pair. This report identifies for the first time how ITC can be used to experimentally determine thermodynamic quantities that are key parameters for understanding and predicting conductivity in AEMs.
Collapse
Affiliation(s)
- Michael T Kwasny
- Department of Polymer Science and Engineering , University of Massachusetts Amherst , Amherst , Massachusetts 01003 , United States
| | - Liang Zhu
- Department of Materials Science and Engineering , The Pennsylvania State University , University Park , Pennsylvania 16802 , United States
| | - Michael A Hickner
- Department of Materials Science and Engineering , The Pennsylvania State University , University Park , Pennsylvania 16802 , United States
| | - Gregory N Tew
- Department of Polymer Science and Engineering , University of Massachusetts Amherst , Amherst , Massachusetts 01003 , United States
| |
Collapse
|
23
|
Fernandez-Alvarez R, Ďorďovič V, Uchman M, Matějíček P. Amphiphiles without Head-and-Tail Design: Nanostructures Based on the Self-Assembly of Anionic Boron Cluster Compounds. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:3541-3554. [PMID: 29144761 DOI: 10.1021/acs.langmuir.7b03306] [Citation(s) in RCA: 52] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Anionic boron cluster compounds (ABCCs) are intrinsically amphiphilic building blocks suitable for nanochemistry. ABCCs are involved in atypical weak interactions, notably dihydrogen bonding, due to their peculiar polyhedral structure, consisting of negatively charged B-H units. The most striking feature of ABCCs that differentiates them from typical surfactants is the lack of head-and-tail structure. Furthermore, their structure can be described as intrinsically amphiphilic or aquaneutral. Therefore, classical terms established to describe self-assembly of classical amphiphiles are insufficient and need to be reconsidered. The opinions and theories focused on the solution behavior of ABCCs are briefly discussed. Moreover, a comparison between ABCCs with other amphiphilic systems is made focusing on the explanation of enthalpy-driven micellization or relations between hydrophobic and chaotropic effects. Despite the unusual structure, ABCCs still show self- and coassembly properties comparable to classical amphiphiles such as ionic surfactants. They self-assemble into micelles in water according to the closed association model. The most typical features of ABCCs solution behavior is demonstrated on calorimetry, NMR spectroscopy, and tensiometry experiments. Altogether, the unique features of ABCCs makes them a valuable inclusion into the nanochemisty toolbox to develop novel nanostructures both alone and with other molecules.
Collapse
Affiliation(s)
- Roberto Fernandez-Alvarez
- Department of Physical and Macromolecular Chemistry, Faculty of Science , Charles University , Hlavova 2030 , 128 40 Prague 2 , Czechia
| | - Vladimír Ďorďovič
- Department of Physical and Macromolecular Chemistry, Faculty of Science , Charles University , Hlavova 2030 , 128 40 Prague 2 , Czechia
| | - Mariusz Uchman
- Department of Physical and Macromolecular Chemistry, Faculty of Science , Charles University , Hlavova 2030 , 128 40 Prague 2 , Czechia
| | - Pavel Matějíček
- Department of Physical and Macromolecular Chemistry, Faculty of Science , Charles University , Hlavova 2030 , 128 40 Prague 2 , Czechia
| |
Collapse
|
24
|
Koh A, Todd K, Sherbourne E, Gross RA. Fundamental Characterization of the Micellar Self-Assembly of Sophorolipid Esters. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:5760-5768. [PMID: 28510440 DOI: 10.1021/acs.langmuir.7b00480] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Surfactants are ubiquitous constituents of commercial and biological systems that function based on complex structure-dependent interactions. Sophorolipid (SL) n-alkyl esters (SL-esters) comprise a group of modified naturally derived glycolipids from Candida bombicola. Herein, micellar self-assembly behavior as a function of SL-ester chain length was studied. Surface tensions as low as 31.2 mN/m and critical micelle concentrations (CMCs) as low as 1.1 μM were attained for diacetylated SL-decyl ester (dASL-DE) and SL-octyl ester, respectively. For deacetylated SL-esters, CMC values reach a lower limit at SL-ester chains above n-butyl (SL-BE, 1-3 μM). This behavior of SL-esters with increasing hydrophobic tail length is unlike other known surfactants. Diffusion-ordered spectroscopy (DOSY) and T1 relaxation NMR experiments indicate this behavior is due to a change in intramolecular interactions, which impedes the self-assembly of SL-esters with chain lengths above SL-BE. This hypothesis is supported by micellar thermodynamics where a disruption in trends occurs at n-alkyl ester chain lengths above those of SL-BE and SL-hexyl ester (SL-HE). Diacetylated (dA) SL-esters exhibit an even more unusual trend in that CMC increases from 1.75 to 815 μM for SL-ester chain lengths of dASL-BE and dASL-DE, respectively. Foaming studies, performed to reveal the macroscopic implications of SL-ester micellar behavior, show that the observed instability in foams formed using SL-esters are due to coalescence, which highlights the importance of understanding intermicellar interactions. This work reveals that SL-esters are an important new family of green high-performing surfactants with unique structure-property relationships that can be tuned to optimize micellar characteristics.
Collapse
Affiliation(s)
- Amanda Koh
- Department of Chemical & Biological Engineering, ‡Department of Biology, and §Department of Chemistry, Center for Biotechnology and Interdisciplinary Studies, Rensselaer Polytechnic Institute (RPI) , Biotechnology Building, 110 Eighth Street, Troy, New York 12180, United States
| | - Katherine Todd
- Department of Chemical & Biological Engineering, ‡Department of Biology, and §Department of Chemistry, Center for Biotechnology and Interdisciplinary Studies, Rensselaer Polytechnic Institute (RPI) , Biotechnology Building, 110 Eighth Street, Troy, New York 12180, United States
| | - Ezekiel Sherbourne
- Department of Chemical & Biological Engineering, ‡Department of Biology, and §Department of Chemistry, Center for Biotechnology and Interdisciplinary Studies, Rensselaer Polytechnic Institute (RPI) , Biotechnology Building, 110 Eighth Street, Troy, New York 12180, United States
| | - Richard A Gross
- Department of Chemical & Biological Engineering, ‡Department of Biology, and §Department of Chemistry, Center for Biotechnology and Interdisciplinary Studies, Rensselaer Polytechnic Institute (RPI) , Biotechnology Building, 110 Eighth Street, Troy, New York 12180, United States
| |
Collapse
|
25
|
Alipour E, Halverson D, McWhirter S, Walker GC. Phospholipid Bilayers: Stability and Encapsulation of Nanoparticles. Annu Rev Phys Chem 2017; 68:261-283. [DOI: 10.1146/annurev-physchem-040215-112634] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Elnaz Alipour
- Department of Chemistry, University of Toronto, Toronto, Ontario M5S 3H6, Canada;, , ,
| | - Duncan Halverson
- Department of Chemistry, University of Toronto, Toronto, Ontario M5S 3H6, Canada;, , ,
| | - Samantha McWhirter
- Department of Chemistry, University of Toronto, Toronto, Ontario M5S 3H6, Canada;, , ,
| | - Gilbert C. Walker
- Department of Chemistry, University of Toronto, Toronto, Ontario M5S 3H6, Canada;, , ,
| |
Collapse
|
26
|
Huang Y, Sumida M, Kumazoe M, Sugihara K, Suemasu Y, Yamada S, Yamashita S, Miyakawa J, Takahashi T, Tanaka H, Fujimura Y, Tachibana H. Oligomer formation of a tea polyphenol, EGCG, on its sensing molecule 67 kDa laminin receptor. Chem Commun (Camb) 2017; 53:1941-1944. [DOI: 10.1039/c6cc09504f] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Green tea polyphenol (−)-epigallocatechin-3-O-gallate (EGCG) has been attributed to the activation of its cell surface sensing receptor 67 kDa laminin receptor (67LR).
Collapse
|
27
|
Nanostructuring Biomaterials with Specific Activities towards Digestive Enzymes for Controlled Gastrointestinal Absorption of Lipophilic Bioactive Molecules. Adv Colloid Interface Sci 2016; 237:52-75. [PMID: 28314428 DOI: 10.1016/j.cis.2016.10.003] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2016] [Revised: 10/18/2016] [Accepted: 10/18/2016] [Indexed: 11/24/2022]
Abstract
This review describes the development of novel lipid-based biomaterials that modulate fat digestion for the enhanced uptake of encapsulated lipophilic bioactive compounds (e.g. drugs and vitamins). Specific focus is directed towards analysing how key material characteristics affect the biological function of digestive lipases and manipulate lipolytic digestion. The mechanism of lipase action is a complex, interfacial process, whereby hydrolysis can be controlled by the ability for lipase to access and adsorb to the lipid-in-water interface. However, significant conjecture exists within the literature regarding parameters that influence the activities of digestive lipases. Important findings from recent investigations that strategically examined the interplay between the interfacial composition of the lipid microenvironment and lipolysis kinetics in simulated biophysical environments are presented. The correlation between lipolysis and the rate of solubilisation and absorption of lipophilic compounds in the gastrointestinal tract (GIT) is detailed. Greater insights into the mechanism of lipase action have provided a new approach for designing colloidal carriers that orally deliver poorly soluble compounds, directly impacting the pharmaceutical and food industries.
Collapse
|
28
|
Displacement of Drugs From Cyclodextrin Complexes by Bile Salts: A Suggestion of an Intestinal Drug-Solubilizing Capacity From an In Vitro Model. J Pharm Sci 2016; 105:2640-2647. [DOI: 10.1002/jps.24678] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2015] [Revised: 07/13/2015] [Accepted: 09/15/2015] [Indexed: 11/07/2022]
|
29
|
Vila Verde A, Frenkel D. Kinetics of formation of bile salt micelles from coarse-grained Langevin dynamics simulations. SOFT MATTER 2016; 12:5172-5179. [PMID: 27199094 DOI: 10.1039/c6sm00763e] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
We examine the mechanism of formation of micelles of dihydroxy bile salts using a coarse-grained, implicit solvent model and Langevin dynamics simulations. We find that bile salt micelles primarily form via addition and removal of monomers, similarly to surfactants with typical head-tail molecular structures, and not via a two-stage mechanism - involving formation of oligomers and their subsequent aggregation to form larger micelles - originally proposed for bile salts. The free energy barrier to removal of single bile monomers from micelles is ≈2kBT, much less than what has been observed for head-tail surfactants. Such a low barrier may be biologically relevant: it allows for rapid release of bile monomers into the intestine, possibly enabling the coverage of fat droplets by bile salt monomers and subsequent release of micelles containing fats and bile salts - a mechanism that is not possible for ionic head-tail surfactants of similar critical micellar concentrations.
Collapse
Affiliation(s)
- Ana Vila Verde
- Theory and Bio-Systems Department, Max Planck Institute of Colloids and Interfaces, Wissenschaftspark Golm, 14424 Potsdam, Germany.
| | | |
Collapse
|
30
|
Waters LJ, Shokry DS, Parkes GM. Predicting human intestinal absorption in the presence of bile salt with micellar liquid chromatography. Biomed Chromatogr 2016; 30:1618-24. [DOI: 10.1002/bmc.3731] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2015] [Revised: 02/22/2016] [Accepted: 03/29/2016] [Indexed: 11/05/2022]
Affiliation(s)
- Laura J. Waters
- School of Applied Sciences; University of Huddersfield; Queensgate Huddersfield HD1 3DH UK
| | - Dina S. Shokry
- School of Applied Sciences; University of Huddersfield; Queensgate Huddersfield HD1 3DH UK
| | - Gareth M.B. Parkes
- School of Applied Sciences; University of Huddersfield; Queensgate Huddersfield HD1 3DH UK
| |
Collapse
|
31
|
Køhler J, Schönbeck C, Westh P, Holm R. Hydration Differences Explain the Large Variations in the Complexation Thermodynamics of Modified γ-Cyclodextrins with Bile Salts. J Phys Chem B 2016; 120:396-405. [DOI: 10.1021/acs.jpcb.5b10536] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jonatan Køhler
- Pharmaceutical
Science and CMC Biologics, H. Lundbeck A/S, Ottiliavej 9, DK-2500 Valby, Denmark
- NSM,
Research Unit for Functional Biomaterials, Roskilde University, Universitetsvej 1, DK-4000 Roskilde, Denmark
| | - Christian Schönbeck
- Pharmaceutical
Science and CMC Biologics, H. Lundbeck A/S, Ottiliavej 9, DK-2500 Valby, Denmark
- NSM,
Research Unit for Functional Biomaterials, Roskilde University, Universitetsvej 1, DK-4000 Roskilde, Denmark
| | - Peter Westh
- NSM,
Research Unit for Functional Biomaterials, Roskilde University, Universitetsvej 1, DK-4000 Roskilde, Denmark
| | - René Holm
- Pharmaceutical
Science and CMC Biologics, H. Lundbeck A/S, Ottiliavej 9, DK-2500 Valby, Denmark
| |
Collapse
|
32
|
Zhang H, Deng L, Sun P, Que F, Weiss J. Solubilization of octane in cationic surfactant–anionic polymer complexes: Effect of ionic strength. J Colloid Interface Sci 2016; 461:88-95. [DOI: 10.1016/j.jcis.2015.09.028] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2015] [Revised: 09/07/2015] [Accepted: 09/08/2015] [Indexed: 10/23/2022]
|
33
|
Use of isothermal titration calorimetry to study surfactant aggregation in colloidal systems. Biochim Biophys Acta Gen Subj 2015; 1860:999-1016. [PMID: 26459003 DOI: 10.1016/j.bbagen.2015.10.003] [Citation(s) in RCA: 74] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2015] [Revised: 09/23/2015] [Accepted: 10/07/2015] [Indexed: 02/01/2023]
Abstract
BACKGROUND Isothermal titration calorimetry (ITC) is a general technique that allows for precise and highly sensitive measurements. These measurements may provide a complete and accurate thermodynamic description of association processes in complex systems such as colloidal mixtures. SCOPE OF THE REVIEW This review will address uses of ITC for studies of surfactant aggregation to form micelles, with emphasis on the thermodynamic studies of homologous surfactant series. We will also review studies on surfactant association with polymers of different molecular characteristics and with colloidal particles. GENERAL SIGNIFICANCE ITC studies on the association of different homologous series of surfactants provide quantitative information on independent contribution from their apolar hydrocarbon chains and polar headgroups to the different thermodynamic functions associated with micellization (Gibbs energy, enthalpy and entropy). Studies on surfactant association to polymers by ITC provide a comprehensive description of the association process, including examples in which particular features revealed by ITC were elucidated by using ancillary techniques such as light or X-ray scattering measurements. Examples of uses of ITC to follow surfactant association to biomolecules such as proteins or DNA, or nanoparticles are also highlighted. Finally, recent theoretical models that were proposed to analyze ITC data in terms of binding/association processes are discussed. MAJOR CONCLUSIONS This review stresses the importance of using direct calorimetric measurements to obtain and report accurate thermodynamic data, even in complex systems. These data, whenever possible, should be confirmed and associated with other ancillary techniques that allow elucidation of the nature of the transformations detected by calorimetric results, providing a complete description of the process under scrutiny.
Collapse
|