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Zhu H, Deng X, Yakovlev VV, Zhang D. Dynamics of CH/ n hydrogen bond networks probed by time-resolved CARS spectroscopy. Chem Sci 2024:d4sc03985h. [PMID: 39156926 PMCID: PMC11323804 DOI: 10.1039/d4sc03985h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2024] [Accepted: 07/30/2024] [Indexed: 08/20/2024] Open
Abstract
Hydrogen bond (HB) networks are essential for stabilizing molecular structures in solution and govern the solubility and functionality of molecules in an aqueous environment. HBs are important in biological processes such as enzyme-substrate interactions, protein folding, and DNA replication. However, the exact role of weakly polarized C-H bonds as HB proton donors in solution, such as CH/n HBs, remains mostly unknown. Here, we employ a novel approach focusing on vibrational dephasing to investigate the coherence relaxation of induced dipoles in C-H bonds within CH/n HB networks, utilizing time-resolved coherent anti-Stokes Raman scattering (T-CARS) spectroscopy. Using a representative binary system of dimethyl sulfoxide (DMSO)-water, known for its C-H backboned HB system (i.e., C-H⋯S), we observed an increase in the dephasing time of the C-H bending mode with increasing water content until a percolation threshold at a 6 : 1 water : DMSO molar ratio, where the trend is reversed. These results provide compelling evidence for the existence of C-H⋯S structures and underscore the presence of a percolation effect, suggesting a critical threshold where long-range connectivity is disputed.
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Affiliation(s)
- Hanlin Zhu
- Zhejiang Key Laboratory of Micro-nano Quantum Chips and Quantum Control, School of Physics, Zhejiang University Hangzhou Zhejiang 310027 China
- MOE Frontier Science Center for Brain Science & Brain-Machine Integration, Zhejiang University Hangzhou Zhejiang 310027 China
| | - Xinyu Deng
- Zhejiang Key Laboratory of Micro-nano Quantum Chips and Quantum Control, School of Physics, Zhejiang University Hangzhou Zhejiang 310027 China
- MOE Frontier Science Center for Brain Science & Brain-Machine Integration, Zhejiang University Hangzhou Zhejiang 310027 China
| | - Vladislav V Yakovlev
- Department of Biomedical Engineering, Texas A&M University College Station TX 77843 USA
- Department of Physics and Astronomy, Texas A&M University College Station TX 77843 USA
- Department of Electrical and Computer Engineering, Texas A&M University College Station TX 77843 USA
| | - Delong Zhang
- Zhejiang Key Laboratory of Micro-nano Quantum Chips and Quantum Control, School of Physics, Zhejiang University Hangzhou Zhejiang 310027 China
- MOE Frontier Science Center for Brain Science & Brain-Machine Integration, Zhejiang University Hangzhou Zhejiang 310027 China
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2
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Monti GA, Falcone RD, Moyano F, Correa NM. Green AOT reverse micelles as nanoreactors for alkaline phosphatase. The hydrogen bond "dances" between water and the enzyme, the reaction product, and the reverse micelles interface. RSC Adv 2023; 13:1194-1202. [PMID: 36686944 PMCID: PMC9811498 DOI: 10.1039/d2ra06296h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2022] [Accepted: 12/21/2022] [Indexed: 01/06/2023] Open
Abstract
In this work, we present an investigation of the influence of water encapsulated in 1,4-bis-2-ethylhexylsulfosuccinate/methyl laurate and 1,4-bis-2-ethylhexylsulfosuccinate/isopropyl myristate reverse micelles on the enzymatic hydrolysis of 1-naphthyl phosphate by alkaline phosphatase. Our results show that the enzyme is active in the biocompatible reverse micelles studied and that the Michaelis-Menten kinetic model is valid in all systems. We found that both micellar systems studied have a particular behavior toward pH and that the penetration of external solvents into the interfaces is crucial to understanding the effect. Methyl laurate does not disrupt the interface and is not necessary to control the pH value since alkaline phosphatase in the center of the micelles is always solvated similarly. In contrast, isopropyl myristate disrupts the interfaces so that the water and 1-naphthol molecules cannot form hydrogen bond interactions with the polar head of the surfactant. Then, when the water is at pH = 7, the 1-naphthol moves away to the interfaces inhibiting alkaline phosphatase which is not observable when the water is at pH = 10. Our study shows that the concept of pH cannot be used directly in a confined environment. In addition, our research is of great importance in the field of reactions that occur in reverse micelles, catalyzed by enzymes.
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Affiliation(s)
- Gustavo A Monti
- Instituto para el Desarrollo Agroindustrial y de la Salud (IDAS, CONICET-UNRC), Departamento de Química, Universidad Nacional de Río Cuarto Río Cuarto Argentina
- Instituto de Investigaciones en Tecnologías Energéticas y Materiales Avanzados (IITEMA, CONICET-UNRC), Departamento de Tecnología Química, Universidad Nacional de Río Cuarto Río Cuarto Argentina
| | - R Darío Falcone
- Instituto para el Desarrollo Agroindustrial y de la Salud (IDAS, CONICET-UNRC), Departamento de Química, Universidad Nacional de Río Cuarto Río Cuarto Argentina
| | - Fernando Moyano
- Instituto para el Desarrollo Agroindustrial y de la Salud (IDAS, CONICET-UNRC), Departamento de Química, Universidad Nacional de Río Cuarto Río Cuarto Argentina
| | - N Mariano Correa
- Instituto para el Desarrollo Agroindustrial y de la Salud (IDAS, CONICET-UNRC), Departamento de Química, Universidad Nacional de Río Cuarto Río Cuarto Argentina
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3
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Blach D, Girardi VR, Silber JJ, Correa NM, Falcone RD. How the type of interface can alter the behavior of an aprotic ionic liquid-water mixture entrapped in different reverse micelles. An exploratory study using an enzymatic reaction as a sensor. Colloids Surf A Physicochem Eng Asp 2022. [DOI: 10.1016/j.colsurfa.2022.129812] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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4
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Dib N, Girardi VR, Silber JJ, Correa NM, Falcone RD. How the external solvent in biocompatible reverse micelles can improve the alkaline phosphatase behavior. Org Biomol Chem 2021; 19:4969-4977. [PMID: 34002175 DOI: 10.1039/d0ob02371j] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In the last decade, the nature of the nonpolar solvents that can be part of reverse micelles (RMs) has been the topic of several investigations to improve their applications. In this sense, the hydrolysis of 1-naphthyl phosphate catalyzed by the enzyme alkaline phosphatase (AP) was used as a probe to investigate the effect of the change of the external solvent on RMs formulated with the anionic surfactant sodium diethylhexyl sulfosuccinate (AOT). As external nonpolar solvents, two biocompatible lipophilic esters, isopropyl myristate and methyl laurate, and the traditional nonpolar solvents, n-heptane and benzene, were used. The results were compared among the RMs investigated and with the reaction in homogeneous media. Thus, the effect of the nanoconfinement as well as the impact of the replacement of a conventional external nonpolar solvent by biocompatible solvents were analyzed. The results indicate that the catalytic efficiency in the AOT RMs is larger than that in homogeneous media, denoting a different hydration level over the AP enzyme, which is directly related to the different degrees of nonpolar solvent penetration to the RM interface. Our findings demonstrated that toxic solvents such as n-heptane and benzene can be replaced by nontoxic ones (isopropyl myristate or methyl laurate) in AOT RMs without affecting the performance of micellar systems as nanoreactors, making them a green and promising alternative toward efficient and sustainable chemistry.
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Affiliation(s)
- Nahir Dib
- Departamento de Química, Universidad Nacional de Rio Cuarto, Agencia Postal 3, C.P. X5804BYA, Ruta Nacional 36, km 601, Rio Cuarto, Córdoba, Argentina and Instituto de Desarrollo Agroindustrial y de la Salud (IDAS), Universidad Nacional de Río Cuarto, Agencia Postal 3, C.P. X5804BYA, Ruta Nacional 36, km 601, Río Cuarto, Córdoba, Argentina.
| | - Valeria R Girardi
- Departamento de Química, Universidad Nacional de Rio Cuarto, Agencia Postal 3, C.P. X5804BYA, Ruta Nacional 36, km 601, Rio Cuarto, Córdoba, Argentina
| | - Juana J Silber
- Departamento de Química, Universidad Nacional de Rio Cuarto, Agencia Postal 3, C.P. X5804BYA, Ruta Nacional 36, km 601, Rio Cuarto, Córdoba, Argentina and Instituto de Desarrollo Agroindustrial y de la Salud (IDAS), Universidad Nacional de Río Cuarto, Agencia Postal 3, C.P. X5804BYA, Ruta Nacional 36, km 601, Río Cuarto, Córdoba, Argentina.
| | - N Mariano Correa
- Departamento de Química, Universidad Nacional de Rio Cuarto, Agencia Postal 3, C.P. X5804BYA, Ruta Nacional 36, km 601, Rio Cuarto, Córdoba, Argentina and Instituto de Desarrollo Agroindustrial y de la Salud (IDAS), Universidad Nacional de Río Cuarto, Agencia Postal 3, C.P. X5804BYA, Ruta Nacional 36, km 601, Río Cuarto, Córdoba, Argentina.
| | - R Dario Falcone
- Departamento de Química, Universidad Nacional de Rio Cuarto, Agencia Postal 3, C.P. X5804BYA, Ruta Nacional 36, km 601, Rio Cuarto, Córdoba, Argentina and Instituto de Desarrollo Agroindustrial y de la Salud (IDAS), Universidad Nacional de Río Cuarto, Agencia Postal 3, C.P. X5804BYA, Ruta Nacional 36, km 601, Río Cuarto, Córdoba, Argentina.
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5
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Braham SA, Morellon-Sterling R, de Andrades D, Rodrigues RC, Siar EH, Aksas A, Pedroche J, Millán MDC, Fernandez-Lafuente R. Effect of Tris Buffer in the Intensity of the Multipoint Covalent Immobilization of Enzymes in Glyoxyl-Agarose Beads. Appl Biochem Biotechnol 2021; 193:2843-2857. [PMID: 34019251 DOI: 10.1007/s12010-021-03570-4] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2020] [Accepted: 04/08/2021] [Indexed: 12/12/2022]
Abstract
Tris is an extensively used buffer that presents a primary amine group on its structure. In the present work trypsin, chymotrypsin and penicillin G acylase (PGA) were immobilized/stabilized on glyoxyl agarose in presence of different concentrations of Tris (from 0 to 20 mM). The effects of the presence of Tris during immobilization were studied analyzing the thermal stability of the obtained immobilized biocatalysts. The results indicate a reduction of the enzyme stability when immobilized in the presence of Tris. This effect can be observed in inactivations carried out at pH 5, 7, and 9 with all the enzymes assayed. The reduction of enzyme stability increased with the Tris concentration. Another interesting result is that the stability reduction was more noticeable for immobilized PGA than in the other immobilized enzymes, the biocatalysts prepared in presence of 20 mM Tris lost totally the activity at pH 7 just after 1 h of inactivation, while the reference at this time still kept around 61 % of the residual activity. These differences are most likely due to the homogeneous distribution of the Lys groups in PGA compared to trypsin and chymotrypsin (where almost 50% of Lys group are in a small percentage of the protein surface). The results suggest that Tris could be affecting the multipoint covalent immobilization in two different ways, on one hand, reducing the number of available glyoxyl groups of the support during immobilization, and on the other hand, generating some steric hindrances that difficult the formation of covalent bonds.
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Affiliation(s)
- Sabrina Ait Braham
- Laboratoire de Biotechnologies Végétales et Ethnobotanique, Faculté des Sciences de la Nature et de la Vie, Université de Bejaia, 06000, Bejaia, Algeria
| | | | - Diandra de Andrades
- Departamento de Biocatálisis, Instituto de Catálisis-CSIC, C/ Marie Curie 2, Campus UAM-CSI, Cantoblanco, 28049, Madrid, Spain.,Biotechnology, Bioprocess, and Biocatalysis Group, Food Science and Technology Institute, Federal University of Rio Grande do Sul, Porto Alegre, RS, Brazil
| | - Rafael C Rodrigues
- Biotechnology, Bioprocess, and Biocatalysis Group, Food Science and Technology Institute, Federal University of Rio Grande do Sul, Porto Alegre, RS, Brazil
| | - El-Hocine Siar
- Departamento de Biocatálisis, Instituto de Catálisis-CSIC, C/ Marie Curie 2, Campus UAM-CSI, Cantoblanco, 28049, Madrid, Spain.,Transformation and Food Product Elaboration Laboratory, Nutrition and Food Technology Institute (INATAA), University of Brothers Mentouri Constantine 1, Constantine, Algeria
| | - Ali Aksas
- Laboratoire de Biotechnologies Végétales et Ethnobotanique, Faculté des Sciences de la Nature et de la Vie, Université de Bejaia, 06000, Bejaia, Algeria
| | - Justo Pedroche
- Group of Plant Proteins, Department of Food and Health, Instituto de la Grasa-CSIC, Seville, Spain
| | - Maria Del Carmen Millán
- Group of Plant Proteins, Department of Food and Health, Instituto de la Grasa-CSIC, Seville, Spain
| | - Roberto Fernandez-Lafuente
- Departamento de Biocatálisis, Instituto de Catálisis-CSIC, C/ Marie Curie 2, Campus UAM-CSI, Cantoblanco, 28049, Madrid, Spain. .,Center of Excellence in Bionanoscience Research, External Scientific Advisory Academics, King Abdulaziz University, Jeddah, 21589, Saudi Arabia.
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6
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Braham SA, Siar EH, Arana-Peña S, Bavandi H, Carballares D, Morellon-Sterling R, de Andrades D, Kornecki JF, Fernandez-Lafuente R. Positive effect of glycerol on the stability of immobilized enzymes: Is it a universal fact? Process Biochem 2021. [DOI: 10.1016/j.procbio.2020.12.015] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
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7
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Morellon-Sterling R, Siar EH, Braham SA, de Andrades D, Pedroche J, Millán MDC, Fernandez-Lafuente R. Effect of amine length in the interference of the multipoint covalent immobilization of enzymes on glyoxyl agarose beads. J Biotechnol 2021; 329:128-142. [PMID: 33600890 DOI: 10.1016/j.jbiotec.2021.02.005] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2020] [Revised: 01/25/2021] [Accepted: 02/10/2021] [Indexed: 12/20/2022]
Abstract
Trypsin, chymotrypsin, penicillin G acylase and ficin extract have been stabilized by immobilization on glyoxyl agarose, adding different aliphatic compounds bearing a primary amine group during the immobilization: ethyl amine, butyl amine, hexyl amine (at concentrations ranging from 0 to 20 mM) and octyl amine (from 0 to 10 mM) to analyze their effects on the immobilized enzyme stability. As expected, the presence of amines reduced the intensity of the enzyme-support multipoint covalent attachment, and therefore the enzyme stability. However, it is clear that this effect is higher using octyl amine for all enzymes (in some cases the enzyme immobilized in the presence of 10 mM octyl amine was almost inactivated while the reference kept over 50 % of the initial activity). This way, it seems that the most important effect of the presence of aminated compounds came from the generation of steric hindrances to the enzyme/support multi-reaction promoted by the ammines that are interacting with the aldehyde groups. In some instances, just 1 mM of aminated compounds is enough to greatly decrease enzyme stability. The results suggested that, if the composition of the enzyme extract is unknown, to eliminate small aminated compounds may be necessary to maximize the enzyme-support reaction.
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Affiliation(s)
| | - El-Hocine Siar
- Departamento de Biocatálisis, Instituto de Catálisis-CSIC, Campus UAM-CSIC Madrid, Spain; Transformation and Food Product Elaboration Laboratory, Nutrition and Food, Technology Institute (INATAA), University of Brothers Mentouri Constantine 1, Algeria
| | - Sabrina Ait Braham
- Departamento de Biocatálisis, Instituto de Catálisis-CSIC, Campus UAM-CSIC Madrid, Spain; Laboratoire de Biotechnologies Végétales et Ethnobotanique, Faculté des Sciences de la Nature et de la Vie, Université de Bejaia, 06000, Bejaia, Algeria
| | - Diandra de Andrades
- Departamento de Biocatálisis, Instituto de Catálisis-CSIC, Campus UAM-CSIC Madrid, Spain; Biotechnology, Bioprocess, and Biocatalysis Group, Food Science and Technology Institute, Federal University of Rio Grande do Sul, Porto Alegre, RS, Brazil
| | - Justo Pedroche
- Group of Plant Proteins, Department of Food and Health, Instituto de la Grasa-CSIC, Seville, Spain
| | - Mª Del Carmen Millán
- Group of Plant Proteins, Department of Food and Health, Instituto de la Grasa-CSIC, Seville, Spain
| | - Roberto Fernandez-Lafuente
- Departamento de Biocatálisis, Instituto de Catálisis-CSIC, Campus UAM-CSIC Madrid, Spain; Center of Excellence in Bionanoscience Research, External Scientific Advisory Academics, King Abdulaziz University, Jeddah, 21589, Saudi Arabia.
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8
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Effect of Concentrated Salts Solutions on the Stability of Immobilized Enzymes: Influence of Inactivation Conditions and Immobilization Protocol. Molecules 2021; 26:molecules26040968. [PMID: 33673063 PMCID: PMC7918437 DOI: 10.3390/molecules26040968] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2021] [Revised: 02/08/2021] [Accepted: 02/09/2021] [Indexed: 12/13/2022] Open
Abstract
This paper aims to investigate the effects of some salts (NaCl, (NH4)2SO4 and Na2SO4) at pH 5.0, 7.0 and 9.0 on the stability of 13 different immobilized enzymes: five lipases, three proteases, two glycosidases, and one laccase, penicillin G acylase and catalase. The enzymes were immobilized to prevent their aggregation. Lipases were immobilized via interfacial activation on octyl agarose or on glutaraldehyde-amino agarose beads, proteases on glyoxyl agarose or glutaraldehyde-amino agarose beads. The use of high concentrations of salts usually has some effects on enzyme stability, but the intensity and nature of these effects depends on the inactivation pH, nature and concentration of the salt, enzyme and immobilization protocol. The same salt can be a stabilizing or a destabilizing agent for a specific enzyme depending on its concentration, inactivation pH and immobilization protocol. Using lipases, (NH4)2SO4 generally permits the highest stabilities (although this is not a universal rule), but using the other enzymes this salt is in many instances a destabilizing agent. At pH 9.0, it is more likely to find a salt destabilizing effect than at pH 7.0. Results confirm the difficulty of foreseeing the effect of high concentrations of salts in a specific immobilized enzyme.
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Ishida K, Nakamura Y, Ohta T, Oe Y. A Molecular Probe with Both Chromogenic and Fluorescent Units for Detecting Serine Proteases. Molecules 2021; 26:molecules26020482. [PMID: 33477543 PMCID: PMC7831087 DOI: 10.3390/molecules26020482] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2020] [Revised: 01/15/2021] [Accepted: 01/15/2021] [Indexed: 11/16/2022] Open
Abstract
A molecular probe with l-phenylalanine p-nitroanilide and l-lysin 4-methylcoumaryl-7-amide, in which these amino acid derivatives are connected through a succinic-acid spacer, was prepared. Trypsin and papain were detected by blue-fluorescence emission of generated 7-amino-4-methylcoumarin (AMC). α-Chymotrypsin and nattokinase were detected from both the blue-fluorescence emission of AMC and the UV absorbance of p-nitroaniline. In addition, different time courses of p-nitroaniline and AMC were observed between the reaction of P1 with α-chymotrypsin and that with nattokinase. In the case of nattokinase, both the fluorescence emission and UV absorbance slowly increased. In contrast, the increasing UV absorbance was saturated at the early stage of the reaction of the present probe with chymotrypsin, whereas the fluorescence emission continuously increased in the following stages.
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Affiliation(s)
| | | | | | - Yohei Oe
- Correspondence: ; Tel./Fax: +81-774-65-6505
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10
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Oliva R, Jahmidi-Azizi N, Mukherjee S, Winter R. Harnessing Pressure Modulation for Exploring Ligand Binding Reactions in Cosolvent Solutions. J Phys Chem B 2021; 125:539-546. [PMID: 33430595 DOI: 10.1021/acs.jpcb.0c10212] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
A comprehensive understanding of ligand-protein interactions requires information about all thermodynamic parameters that describe the complexation reaction, and they should be able to provide the necessary information to understand the molecular forces that drive complex formation. Usually, binding studies are performed at ambient pressure conditions. However, in addition to using temperature variation to reveal enthalpic and entropic contributions to ligand binding, complementary pressure-dependent studies providing volumetric properties of the reaction can be beneficial. Changes in partial molar volume can inform about changes in packing and hydration upon ligand binding. Here, after a general discussion of pressure effects on ligand binding reactions, we present a comprehensive study of the effect of pressure and a widely used organic cosolvent, dimethyl sulfoxide (DMSO), on the binding of a small aromatic ligand, proflavine, to the enzyme α-chymotrypsin. We found that DMSO, which acts as a competitive inhibitor for proflavine, has a strong impact on the interaction process, resulting in a decrease of the binding constant. While the reaction performed in neat buffer is basically pressure insensitive, the partial molar volume of the complex in the presence of DMSO is larger compared with the uncomplexed state, rendering the binding constant markedly smaller upon pressurization. We also show that the magnitude and sign of the binding volume provide valuable information about the interaction mechanism and hydration changes, which is of particular interest when cosolvents are present.
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Affiliation(s)
- Rosario Oliva
- Physical Chemistry I - Biophysical Chemistry, Faculty of Chemistry and Chemical Biology, TU Dortmund University, Otto-Hahn-Strasse 4a, 44227 Dortmund, Germany
| | - Nisrine Jahmidi-Azizi
- Physical Chemistry I - Biophysical Chemistry, Faculty of Chemistry and Chemical Biology, TU Dortmund University, Otto-Hahn-Strasse 4a, 44227 Dortmund, Germany
| | - Sanjib Mukherjee
- Physical Chemistry I - Biophysical Chemistry, Faculty of Chemistry and Chemical Biology, TU Dortmund University, Otto-Hahn-Strasse 4a, 44227 Dortmund, Germany
| | - Roland Winter
- Physical Chemistry I - Biophysical Chemistry, Faculty of Chemistry and Chemical Biology, TU Dortmund University, Otto-Hahn-Strasse 4a, 44227 Dortmund, Germany
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Dutta A, Mahapatra M, Deb M, Ghosh NN, Chattopadhyay PK, Singha NR. Nonconjugated Biocompatible Macromolecular Luminogens for Sensing and Removals of Fe(III) and Cu(II): DFT Studies on Selective Coordination(s) and On-Off Sensing. Macromol Rapid Commun 2020; 42:e2000522. [PMID: 33210389 DOI: 10.1002/marc.202000522] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2020] [Revised: 10/11/2020] [Indexed: 12/16/2022]
Abstract
This work reports the design and synthesis of two nonaromatic biocompatible macromolecular luminogens, i.e., 2-(dimethylamino)ethyl methacrylate-co-2-(dimethylamino)ethyl 3-(N-(methylol)acrylamido)-2-methylpropanoate-co-N-(methylol)acrylamide/DMAEMA-co-DMAENMAMP-co-NMA (P1) and methacrylic acid-co-3-(N-(methylol)acrylamido)-2-methylpropanoic acid-co-N-(methylol)acrylamide/MEA-co-NMAMPA-co-NMA (P2), prepared through in situ anchored acrylamido-ester/DMAENMAMP and acrylamido-acid/NMAMPA third comonomers, respectively, in a facile polymerization of two non-luminous monomers in water medium to circumvent the drawbacks related to aggregation-caused quenching of aromatic luminogens. The structures of P1/P2, in situ anchored comonomers, fluorophores, N-branching associated n-π* interactions, and hydrogen bonding assisted aggregation-enhanced emissions are comprehended by nuclear magnetic resonance, Fourier transform infrared (FTIR), X-ray photoelectron spectroscopy (XPS), ultraviolet-visible, thermogravimetric analysis (TGA), dynamic light scattering (DLS), transmission electron microscopy (TEM), fluorescence lifetime, and fluorescence imaging. P1 and P2 are appropriate for sensitive detections/exclusions of Fe(III)/Cu(II) and cell-imaging. The intrinsic fluorescence, on-off sensing, selective coordinations of Fe(III) and Cu(II) with fluorophores, emission quenching mechanisms, and removals of Fe(III) and Cu(II) are investigated by DFT/NTO analyses of P1/P2 and Fe(III)-P1 and Cu(II)-P2 complexes, XPS, and isotherms and kinetics parameters. The excellent biocompatibilities, comparable limit of detections, i.e., 1.70 × 10-7 and 1.59 × 10-7 [m], and higher adsorption capacities, i.e., 77.25 and 154.13 mg g-1 , at low ppm; 303 K; and pH = 7 compel P1/P2 to be acceptable for multipurpose applications.
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Affiliation(s)
- Arnab Dutta
- Advanced Polymer Laboratory, Department of Polymer Science and Technology, Government College of Engineering and Leather Technology (Post Graduate), Maulana Abul Kalam Azad University of Technology, Salt Lake City, Kolkata, West Bengal, 700106, India
| | - Manas Mahapatra
- Advanced Polymer Laboratory, Department of Polymer Science and Technology, Government College of Engineering and Leather Technology (Post Graduate), Maulana Abul Kalam Azad University of Technology, Salt Lake City, Kolkata, West Bengal, 700106, India
| | - Mousumi Deb
- Advanced Polymer Laboratory, Department of Polymer Science and Technology, Government College of Engineering and Leather Technology (Post Graduate), Maulana Abul Kalam Azad University of Technology, Salt Lake City, Kolkata, West Bengal, 700106, India
| | - Narendra Nath Ghosh
- Department of Chemistry, University of Gour Banga, Mokdumpur, Malda, West Bengal, 732103, India
| | - Pijush Kanti Chattopadhyay
- Department of Leather Technology, Government College of Engineering and Leather Technology (Post Graduate), Maulana Abul Kalam Azad University of Technology, Salt Lake City, Kolkata, West Bengal, 700106, India
| | - Nayan Ranjan Singha
- Advanced Polymer Laboratory, Department of Polymer Science and Technology, Government College of Engineering and Leather Technology (Post Graduate), Maulana Abul Kalam Azad University of Technology, Salt Lake City, Kolkata, West Bengal, 700106, India
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12
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Mahapatra M, Dutta A, Mitra M, Karmakar M, Ghosh NN, Chattopadhyay PK, Singha NR. Intrinsically Fluorescent Biocompatible Terpolymers for Detection and Removal of Bi(III) and Cell Imaging. ACS APPLIED BIO MATERIALS 2020; 3:6155-6166. [DOI: 10.1021/acsabm.0c00718] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Manas Mahapatra
- Advanced Polymer Laboratory, Department of Polymer Science and Technology, Government College of Engineering and Leather Technology (Post Graduate), Maulana Abul Kalam Azad University of Technology, Salt Lake City, Kolkata 700106, West Bengal, India
| | - Arnab Dutta
- Advanced Polymer Laboratory, Department of Polymer Science and Technology, Government College of Engineering and Leather Technology (Post Graduate), Maulana Abul Kalam Azad University of Technology, Salt Lake City, Kolkata 700106, West Bengal, India
| | - Madhushree Mitra
- Department of Leather Technology, Government College of Engineering and Leather Technology (Post Graduate), Maulana Abul Kalam Azad University of Technology, Salt Lake City, Kolkata 700106, West Bengal, India
| | - Mrinmoy Karmakar
- Advanced Polymer Laboratory, Department of Polymer Science and Technology, Government College of Engineering and Leather Technology (Post Graduate), Maulana Abul Kalam Azad University of Technology, Salt Lake City, Kolkata 700106, West Bengal, India
| | - Narendra Nath Ghosh
- Department of Chemistry, University of Gour Banga, Mokdumpur 732103, West Bengal, India
| | - Pijush Kanti Chattopadhyay
- Department of Leather Technology, Government College of Engineering and Leather Technology (Post Graduate), Maulana Abul Kalam Azad University of Technology, Salt Lake City, Kolkata 700106, West Bengal, India
| | - Nayan Ranjan Singha
- Advanced Polymer Laboratory, Department of Polymer Science and Technology, Government College of Engineering and Leather Technology (Post Graduate), Maulana Abul Kalam Azad University of Technology, Salt Lake City, Kolkata 700106, West Bengal, India
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13
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Chen S, Li J, Fu Z, Wei G, Li H, Zhang B, Zheng L, Deng Z. Enzymatic Synthesis of β-Sitosterol Laurate by Candida rugosa Lipase AY30 in the Water/AOT/Isooctane Reverse Micelle. Appl Biochem Biotechnol 2020; 192:392-414. [DOI: 10.1007/s12010-020-03302-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2019] [Accepted: 03/12/2020] [Indexed: 10/24/2022]
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14
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Ostermeier L, Oliva R, Winter R. The multifaceted effects of DMSO and high hydrostatic pressure on the kinetic constants of hydrolysis reactions catalyzed by α-chymotrypsin. Phys Chem Chem Phys 2020; 22:16325-16333. [DOI: 10.1039/d0cp03062g] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The cosolvent DMSO and high pressure have antagonistic effects on the kinetic constants of α-chymotrypsin-catalyzed hydrolysis reactions.
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Affiliation(s)
- Lena Ostermeier
- Physical Chemistry I – Biophysical Chemistry
- Faculty of Chemistry and Chemical Biology
- TU Dortmund University
- D-44227 Dortmund
- Germany
| | - Rosario Oliva
- Physical Chemistry I – Biophysical Chemistry
- Faculty of Chemistry and Chemical Biology
- TU Dortmund University
- D-44227 Dortmund
- Germany
| | - Roland Winter
- Physical Chemistry I – Biophysical Chemistry
- Faculty of Chemistry and Chemical Biology
- TU Dortmund University
- D-44227 Dortmund
- Germany
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15
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Dib N, Falcone RD, Acuña A, García-Río L. Characterization of Reverse Micelles Formulated with the Ionic-Liquid-like Surfactant Bmim-AOT and Comparison with the Traditional Na-AOT: Dynamic Light Scattering, 1H NMR Spectroscopy, and Hydrolysis Reaction of Carbonate as a Probe. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:12744-12753. [PMID: 31495176 DOI: 10.1021/acs.langmuir.9b01083] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
The present study investigated how the presence of butylmethylimidazolium cation (bmim+) alters the interfacial properties of reverse micelles (RMs) created with the ionic liquid-like surfactant 1-butyl-3-methylimidazolium 1,4-bis-2-ethylhexylsulfosuccinate (bmim-AOT), in comparison to sodium 1,4-bis-2-ethylhexylsulfosuccinate (Na-AOT) RMs, employing dynamic light scattering (DLS) and 1H NMR techniques. Moreover, through the hydrolysis reaction of bis(4-nitrophenyl)carbonate inside both RMs as reaction probe, interfacial properties changes were explored in more detail. The kinetic solvent isotope effect was also analyzed. Micellar systems were formed using n-heptane as external nonpolar solvent and water as the polar component. According to the DLS studies, water is encapsulated inside the organized media; however, a different tendency is observed depending on the cationic component of the surfactant. For Na-AOT system, the results suggest that the micellar shapes are probably spherical, while in the case of bmim-AOT, a transition from ellipsoidal to spherical micelles could be occurring when water is added. 1H NMR data show that water is structured differently when Na+ cation is replaced by bmim+; in bmim-AOT RMs, the interaction of water with the surfactant is weaker and the water hydrogen-bonding network is less disturbed than in Na-AOT RMs. Kinetic studies reveal that the hydrolysis reaction in bmim-AOT RMs was much more favorable in comparison to Na-AOT RMs. In addition, when water content decreases in bmim-AOT RMs, the hydrolysis reaction rate increases and the solvent isotope effect remains constant, while for Na-AOT solutions, both the reaction rate and the solvent isotope effect decrease. Our results indicate that bmim+ cation would be located in the surfactant layer in such a way the negative charge density in the interface is less than that in Na-AOT RMs, and the reaction is more favorable. Additionally, as 1H NMR studies reveal, the interfacial water molecules would be more available in bmim-AOT RMs to participate in the nucleophilic attack. Therefore, the present study evidences how the replacement of Na+ counterion by bmim+ alters the composition of the interface of AOT RMs.
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Affiliation(s)
- Nahir Dib
- Instituto para el Desarrollo Agroindustrial y de la Salud (IDAS), CONICET-UNRC, Departamento de Química , Universidad Nacional de Río Cuarto , Agencia Postal # 3, CP X5804BYA Río Cuarto , Argentina
| | - R Dario Falcone
- Instituto para el Desarrollo Agroindustrial y de la Salud (IDAS), CONICET-UNRC, Departamento de Química , Universidad Nacional de Río Cuarto , Agencia Postal # 3, CP X5804BYA Río Cuarto , Argentina
| | - Angel Acuña
- Centro Singular de Investigación en Química Biolóxica e Materiais Moleculares (CIQUS) and Departamento de Química Física , Universidade de Santiago de Compostela , 15782 Santiago , Spain
| | - Luis García-Río
- Centro Singular de Investigación en Química Biolóxica e Materiais Moleculares (CIQUS) and Departamento de Química Física , Universidade de Santiago de Compostela , 15782 Santiago , Spain
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16
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Gomez Rodríguez EI, Falcone RD, Beassoni PR, Moyano F, Correa NM. Supramolecular Systems as an Alternative for Enzymatic Degradation of 1‐Naphthyl Methylcarbamate (Carbaryl) Pesticide. ChemistrySelect 2019. [DOI: 10.1002/slct.201901735] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Esteban I. Gomez Rodríguez
- Instituto para el Desarrollo Agroindustrial y de la Salud (IDAS)UNRC-CONICET Facultad de Ciencias ExactasFísico-Químicas y Naturales Agencia Postal # 3 C.P. X5804BYA Río Cuarto ARGENTINA
- Departamento de QuímicaUniversidad Nacional de Río CuartoFacultad de Ciencias ExactasFísico-Químicas y Naturales, Agencia Postal # 3 C.P. X5804BYA Río Cuarto ARGENTINA
| | - R. Darío Falcone
- Instituto para el Desarrollo Agroindustrial y de la Salud (IDAS)UNRC-CONICET Facultad de Ciencias ExactasFísico-Químicas y Naturales Agencia Postal # 3 C.P. X5804BYA Río Cuarto ARGENTINA
- Departamento de QuímicaUniversidad Nacional de Río CuartoFacultad de Ciencias ExactasFísico-Químicas y Naturales, Agencia Postal # 3 C.P. X5804BYA Río Cuarto ARGENTINA
| | - Paola R. Beassoni
- Instituto para el Desarrollo Agroindustrial y de la Salud (IDAS)UNRC-CONICET Facultad de Ciencias ExactasFísico-Químicas y Naturales Agencia Postal # 3 C.P. X5804BYA Río Cuarto ARGENTINA
- Departamento de Biologia Molecular Universidad Nacional de Río CuartoFacultad de Ciencias ExactasFísico-Químicas y Naturales. Agencia Postal # 3 C.P. X5804BYA Río Cuarto ARGENTINA
| | - Fernando Moyano
- Instituto para el Desarrollo Agroindustrial y de la Salud (IDAS)UNRC-CONICET Facultad de Ciencias ExactasFísico-Químicas y Naturales Agencia Postal # 3 C.P. X5804BYA Río Cuarto ARGENTINA
- Departamento de QuímicaUniversidad Nacional de Río CuartoFacultad de Ciencias ExactasFísico-Químicas y Naturales, Agencia Postal # 3 C.P. X5804BYA Río Cuarto ARGENTINA
| | - N. Mariano Correa
- Instituto para el Desarrollo Agroindustrial y de la Salud (IDAS)UNRC-CONICET Facultad de Ciencias ExactasFísico-Químicas y Naturales Agencia Postal # 3 C.P. X5804BYA Río Cuarto ARGENTINA
- Departamento de QuímicaUniversidad Nacional de Río CuartoFacultad de Ciencias ExactasFísico-Químicas y Naturales, Agencia Postal # 3 C.P. X5804BYA Río Cuarto ARGENTINA
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17
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Mulko L, Pereyra JY, Rivarola CR, Barbero CA, Acevedo DF. Improving the retention and reusability of Alpha-amylase by immobilization in nanoporous polyacrylamide-graphene oxide nanocomposites. Int J Biol Macromol 2019; 122:1253-1261. [DOI: 10.1016/j.ijbiomac.2018.09.078] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2018] [Revised: 09/05/2018] [Accepted: 09/13/2018] [Indexed: 10/28/2022]
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18
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Lépori CMO, Correa NM, Silber JJ, Vaca Chávez F, Falcone RD. Interfacial properties modulated by the water confinement in reverse micelles created by the ionic liquid-like surfactant bmim-AOT. SOFT MATTER 2019; 15:947-955. [PMID: 30644504 DOI: 10.1039/c8sm02217h] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
The behavior of the interfacial water entrapped in reverse micelles (RMs) that were formed by the ionic liquid-like surfactant 1-butyl-3-methylimidazolium 1,4-bis-2-ethylhexylsulfosuccinate (bmim-AOT) was investigated with the use of UV-Vis absorption spectroscopy and nuclear magnetic resonance (NMR) relaxometry. The solvatochromism of two molecular probes, namely, 1-methyl-8-oxyquinolinium betaine (QB) and N,N,N',N'-tetramethylethylenediamine copper(ii)acetylacetonate tetraphenylborate ([Cu(acac)(tmen)][B(C6H5)4]), was investigated. As a comparison, the analog RMs formed by sodium 1,4-bis-2-ethylhexylsulfosuccinate (Na-AOT) were also explored. By varying the water content inside the RMs and consequently the different magnitude of the water-surfactant interactions at the interface, interesting properties were observed by comparing bmim-AOT and Na-AOT RMs. From the solvatochromic behavior of ([Cu(acac)(tmen)][B(C6H5)4]), we found that the interface in bmim-AOT RMs shows a smaller electron donating capacity than that in Na-AOT RMs. QB revealed that the interfacial region is a weaker hydrogen bond donor and less polar than the corresponding Na-AOT RMs. NMR experiments showed that the molecular motion of water in bmim-AOT RMs is less restricted than that of the water molecules confined in Na-AOT RMs. In summary, the results show how the nature of the bmim+ cation affects the interaction between the entrapped water and the RM interface, greatly modifying the interfacial water structure in comparison with the results known for Na-AOT.
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Affiliation(s)
- Cristian M O Lépori
- Departamento de Química, Universidad Nacional de Río Cuarto, Agencia Postal # 3, C.P. X5804BYA Río Cuarto, Argentina.
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19
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Borunda T, Myers AJ, Mary Fisher J, Crans DC, Johnson MD. Confinement Effects on Chemical Equilibria: Pentacyano(Pyrazine)Ferrate(II) Stability Changes within Nanosized Droplets of Water. Molecules 2018; 23:E858. [PMID: 29642558 PMCID: PMC6016957 DOI: 10.3390/molecules23040858] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2018] [Revised: 03/30/2018] [Accepted: 04/04/2018] [Indexed: 11/16/2022] Open
Abstract
Nanoscale confinement is known to impact properties of molecules and we observed changes in the reactivity of an iron coordination complex, pentacyano(pyrazine)ferrate(II). The confinement of two coordination complexes in a sodium AOT/isooctane reverse micellar (RM) water droplet was found to dramatically increase the hydrolysis rate of [Fe(CN)₅pyz]3- and change the monomer-dimer equilibria between [Fe(CN)₅pyz]3- and [Fe₂(CN)10pyz]6-. Combined UV-Vis and ¹H-NMR spectra of these complexes in RMs were analyzed and the position of the monomer-dimer equilibrium and the relative reaction times were determined at three different RM sizes. The data show that the hydrolysis rates (loss of pyrazine) are dramatically enhanced in RMs over bulk water and increase as the size of the RM decreases. Likewise, the monomer-dimer equilibrium changes to favor the formation of dimer as the RM size decreases. We conclude that the effects of the [Fe(CN)₅pyz]3- stability is related to its solvation within the RM.
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Affiliation(s)
- Teofilo Borunda
- Department of Chemistry & Biochemistry, New Mexico State University, Las Cruces, NM 88003, USA.
| | - Alexander J Myers
- Department of Chemistry & Biochemistry, New Mexico State University, Las Cruces, NM 88003, USA.
| | - J Mary Fisher
- Department of Chemistry, Colorado State University, Ft. Collins, CO 80523, USA.
| | - Debbie C Crans
- Department of Chemistry, Colorado State University, Ft. Collins, CO 80523, USA.
| | - Michael D Johnson
- Department of Chemistry & Biochemistry, New Mexico State University, Las Cruces, NM 88003, USA.
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20
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Monti GA, Fernández GA, Correa NM, Falcone RD, Moyano F, Silbestri GF. Gold nanoparticles stabilized with sulphonated imidazolium salts in water and reverse micelles. ROYAL SOCIETY OPEN SCIENCE 2017; 4:170481. [PMID: 28791171 PMCID: PMC5541566 DOI: 10.1098/rsos.170481] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/10/2017] [Accepted: 06/20/2017] [Indexed: 05/20/2023]
Abstract
Herein we describe the synthesis of gold nanoparticles (Au-NPs) in presence of sulphonated imidazolium salts [1,3-bis(2,6-diisopropyl-4-sodiumsulfonatophenyl)imidazolium (L1), 1-mesityl-3-(3-sulfonatopropyl)imidazolium (L2) and 1-(3-sulfonatopropyl)imidazolium (L3)] in water and in a confinement environment created by reverse micelles (RMs). The Au-NPs were characterized-with an excellent agreement between different techniques-by UV-vis spectroscopy, transmission electron microscopy (TEM), dynamic light scattering (DLS) and zeta potential. In homogeneous media, the Au-NPs interact with the imidazolium ring and the sulphonate groups were directed away from the NPs' surface. This fact is responsible for the Au-NPs' stability-over three months-in water. Based on the obtained zeta potential values we assume the degree of coverage of the Au-NPs by the imidazolium salts. In n-heptane/sodium 1,4-bis (2-ethylhexyl) sulfosuccinate (AOT)/water RMs, the Au-NPs formed in presence of sulphonated imidazolium salts present different patterns depending on the ligand used as stabilizer. Interestingly, the Au-NPs are more stable in time when the salts are present in AOT RMs (three weeks) in comparison with the same RMs system but in absence of ligands (less than an hour). Clearly, the sulphonated imidazolium salts are very effective Au-NPs stabilizers in a different medium and this generates a plus to be able to use them for multiple purposes.
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Affiliation(s)
- Gustavo A. Monti
- Departamento de Química, Universidad Nacional de Río Cuarto, Agencia Postal no. 3, C.P. X5804BYA Río Cuarto, Argentina
| | - Gabriela A. Fernández
- INQUISUR, Departamento de Química, Universidad Nacional del Sur (UNS)-CONICET, Av. Alem 1253, B8000CPB, Bahía Blanca, Argentina
| | - N. Mariano Correa
- Departamento de Química, Universidad Nacional de Río Cuarto, Agencia Postal no. 3, C.P. X5804BYA Río Cuarto, Argentina
| | - R. Darío Falcone
- Departamento de Química, Universidad Nacional de Río Cuarto, Agencia Postal no. 3, C.P. X5804BYA Río Cuarto, Argentina
| | - Fernando Moyano
- Departamento de Química, Universidad Nacional de Río Cuarto, Agencia Postal no. 3, C.P. X5804BYA Río Cuarto, Argentina
- Authors for correspondence: Fernando Moyano e-mail:
| | - Gustavo F. Silbestri
- INQUISUR, Departamento de Química, Universidad Nacional del Sur (UNS)-CONICET, Av. Alem 1253, B8000CPB, Bahía Blanca, Argentina
- Authors for correspondence: Gustavo F. Silbestri e-mail:
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21
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Enzyme activity of α-chymotrypsin: Deactivation by gold nano-cluster and reactivation by glutathione. J Colloid Interface Sci 2017; 494:74-81. [DOI: 10.1016/j.jcis.2017.01.027] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2016] [Revised: 01/07/2017] [Accepted: 01/09/2017] [Indexed: 11/15/2022]
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22
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Crosio MA, Silber JJ, Moyano F, Correa NM, Falcone RD. The Use of AOBH-DEHP Molecular Probe to Characterize BHDC Reverse Micelles Interfaces. Insights on the Interfacial Water Structure. ChemistrySelect 2017. [DOI: 10.1002/slct.201700361] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Matías A. Crosio
- Departamento de Química; Universidad Nacional de Río Cuarto, Agencia Postal # 3. ( X5804ZAB ); Río Cuarto Argentina
| | - Juana J. Silber
- Departamento de Química; Universidad Nacional de Río Cuarto, Agencia Postal # 3. ( X5804ZAB ); Río Cuarto Argentina
| | - Fernando Moyano
- Departamento de Química; Universidad Nacional de Río Cuarto, Agencia Postal # 3. ( X5804ZAB ); Río Cuarto Argentina
| | - N. Mariano Correa
- Departamento de Química; Universidad Nacional de Río Cuarto, Agencia Postal # 3. ( X5804ZAB ); Río Cuarto Argentina
| | - R. Darío Falcone
- Departamento de Química; Universidad Nacional de Río Cuarto, Agencia Postal # 3. ( X5804ZAB ); Río Cuarto Argentina
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23
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Phukon A, Ray S, Sahu K. How Does Interfacial Hydration Alter during Rod to Sphere Transition in DDAB/Water/Cyclohexane Reverse Micelles? Insights from Excited State Proton Transfer and Fluorescence Anisotropy. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:6656-6665. [PMID: 27292367 DOI: 10.1021/acs.langmuir.6b01254] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
How does microscopic organization of an organized assembly alter during macroscopic structural transition? The question may be important to ascertain driving forces responsible for such transitions. Didodecyldimethylammonium bromide (DDAB)/water/cyclohexane reverse micelle is an attractive assembly that undergoes structural transition from rod to spherical shape when the amount of water loading, w0 ([water]/[surfactant]), exceeds a particular value (w0 ∼ 8). Here, we intend to investigate the effect of the morphological change upon interfacial hydration using steady-state and time-resolved fluorescence measurements. The anionic fluorophore 8-hydroxypyrene-1,3,6-trisulfonate (HPTS or pyranine) is expected to be trapped within the positively charged RM interface. The fluorophore can undergo excited-state proton transfer (ESPT) in the presence of water and, thus, is able to provide insight on the level of hydration within the interface. The ESPT process is markedly inhibited within the interface at low w0 and gradually favored with increase of w0. The time-resolved fluorescence decays could be best analyzed by assuming distribution of HPTS over two distinct interfacial regions- partly hydrated and mostly dehydrated. The relative population of the two regions varies distinctly at low w0 (<6) and high w0 (>6) regimes. Moreover, fluorescence anisotropy (steady-state and time-resolved) varies differently with respect to w0, before and after the transition point (w0 ∼ 8).
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Affiliation(s)
- Aparajita Phukon
- Department of Chemistry, Indian Institute of Technology Guwahati , Guwahati 781039, Assam, India
| | - Sudipta Ray
- Department of Chemistry, Indian Institute of Technology Guwahati , Guwahati 781039, Assam, India
| | - Kalyanasis Sahu
- Department of Chemistry, Indian Institute of Technology Guwahati , Guwahati 781039, Assam, India
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24
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Durantini AM, Falcone RD, Silber JJ, Correa NM. Effect of Confinement on the Properties of Sequestered Mixed Polar Solvents: Enzymatic Catalysis in Nonaqueous 1,4-Bis-2-ethylhexylsulfosuccinate Reverse Micelles. Chemphyschem 2016; 17:1678-85. [PMID: 26891863 DOI: 10.1002/cphc.201501190] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2015] [Revised: 02/10/2016] [Indexed: 11/06/2022]
Abstract
The influence of different glycerol, N,N-dimethylformamide (DMF) and water mixtures encapsulated in 1,4-bis-2-ethylhexylsulfosuccinate (AOT)/n-heptane reverse micelles (RMs) on the enzymatic hydrolysis of 2-naphthyl acetate by α-chymotrypsin is demonstrated. In the case of the mixtures with DMF and protic solvents it has been previously shown, using absorption, emission and dynamic light-scattering techniques, that solvents are segregated inside the polar core of the RMs. Protic solvents anchor to the AOT, whereas DMF locates to the polar core of the aggregate. Thus, DMF not only helps to solubilize the hydrophobic substrate, increasing its effective concentrations but surprisingly, it does not affect the enzyme activity. The importance of ensuring the presence of RMs, encapsulation of the polar solvents and the corrections by substrate partitioning in order to obtain reliable conclusions is highlighted. Moreover, the effect of a constrained environment on solvent-solvent interactions in homogenous media and its impact on the use of RMs as nanoreactors is stressed.
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Affiliation(s)
- Andres M Durantini
- Department of Chemistry and Center for Self-Assembled Chemical Structures, McGill University, 801 Sherbrooke Street West, Montreal, Quebec, H3A 0B8, Canada
| | - R Dario Falcone
- Departamento de Química, Universidad Nacional de Río Cuarto, Agencia Postal # 3. C.P., X5804BYA, Río Cuarto, Argentina
| | - Juana J Silber
- Departamento de Química, Universidad Nacional de Río Cuarto, Agencia Postal # 3. C.P., X5804BYA, Río Cuarto, Argentina
| | - N Mariano Correa
- Departamento de Química, Universidad Nacional de Río Cuarto, Agencia Postal # 3. C.P., X5804BYA, Río Cuarto, Argentina.
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25
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Zhong X, Qian Y, Huang J, Yang D, Deng Y, Qiu X. Fabrication of Lignosulfonate Vesicular Reverse Micelles to Immobilize Horseradish Peroxidase. Ind Eng Chem Res 2016. [DOI: 10.1021/acs.iecr.5b04939] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Xiaowen Zhong
- School
of Chemistry and Chemical
Engineering, State Key Lab of Pulp and Paper Engineering, South China University of Technology, Guangzhou, 510640, People’s Republic of China
| | - Yong Qian
- School
of Chemistry and Chemical
Engineering, State Key Lab of Pulp and Paper Engineering, South China University of Technology, Guangzhou, 510640, People’s Republic of China
| | - Jinhao Huang
- School
of Chemistry and Chemical
Engineering, State Key Lab of Pulp and Paper Engineering, South China University of Technology, Guangzhou, 510640, People’s Republic of China
| | - Dongjie Yang
- School
of Chemistry and Chemical
Engineering, State Key Lab of Pulp and Paper Engineering, South China University of Technology, Guangzhou, 510640, People’s Republic of China
| | - Yonghong Deng
- School
of Chemistry and Chemical
Engineering, State Key Lab of Pulp and Paper Engineering, South China University of Technology, Guangzhou, 510640, People’s Republic of China
| | - Xueqing Qiu
- School
of Chemistry and Chemical
Engineering, State Key Lab of Pulp and Paper Engineering, South China University of Technology, Guangzhou, 510640, People’s Republic of China
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26
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Luna MA, Correa NM, Silber JJ, Falcone RD, Moyano F. Properties of AOT reverse micelle interfaces with different polar solvents. J PHYS ORG CHEM 2016. [DOI: 10.1002/poc.3535] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- M. Alejandra Luna
- Departamento de Química; Universidad Nacional de Río Cuarto; Agencia Postal # 3. C.P. X5804BYA Río Cuarto Argentina
| | - N. Mariano Correa
- Departamento de Química; Universidad Nacional de Río Cuarto; Agencia Postal # 3. C.P. X5804BYA Río Cuarto Argentina
| | - Juana J. Silber
- Departamento de Química; Universidad Nacional de Río Cuarto; Agencia Postal # 3. C.P. X5804BYA Río Cuarto Argentina
| | - R. Dario Falcone
- Departamento de Química; Universidad Nacional de Río Cuarto; Agencia Postal # 3. C.P. X5804BYA Río Cuarto Argentina
| | - Fernando Moyano
- Departamento de Química; Universidad Nacional de Río Cuarto; Agencia Postal # 3. C.P. X5804BYA Río Cuarto Argentina
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27
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Luna MA, Silber JJ, Sereno L, Correa NM, Moyano F. Determining the substrate permeability through the bilayer of large unilamellar vesicles of DOPC. A kinetic study. RSC Adv 2016. [DOI: 10.1039/c6ra12847e] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
In this work we determine the permeability of DOPC vesicles in the presence of different cholesterol contents, by using the enzymatic hydrolysis of N-benzoyl-l-tyrosine p-nitroanilide catalyzed by α-chymotrypsin.
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Affiliation(s)
- Maria Alejandra Luna
- Departamento de Química
- Universidad Nacional de Río Cuarto
- C.P. X5804BYA Río Cuarto
- Argentina
| | - Juana J. Silber
- Departamento de Química
- Universidad Nacional de Río Cuarto
- C.P. X5804BYA Río Cuarto
- Argentina
| | - Leonides Sereno
- Departamento de Química
- Universidad Nacional de Río Cuarto
- C.P. X5804BYA Río Cuarto
- Argentina
| | - N. Mariano Correa
- Departamento de Química
- Universidad Nacional de Río Cuarto
- C.P. X5804BYA Río Cuarto
- Argentina
| | - Fernando Moyano
- Departamento de Química
- Universidad Nacional de Río Cuarto
- C.P. X5804BYA Río Cuarto
- Argentina
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28
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Phukon A, Barman N, Sahu K. Wet Interface of Benzylhexadecyldimethylammonium Chloride Reverse Micelle Revealed by Excited State Proton Transfer of a Localized Probe. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:12587-12596. [PMID: 26540303 DOI: 10.1021/acs.langmuir.5b03632] [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
Excited state proton transfer (ESPT) of an anionic photoacid 8-hydroxypyrene-1,3,6-trisulfonic acid (HPTS or pyranine) has been studied inside a cationic reverse micelle (RM), water/benzylhexadecyldimethylammonium chloride (BHDC)/benzene, using steady-state and time-resolved fluorescence spectroscopy. The observed ESPT behavior is found to be remarkably different from the known ESPT trend of HPTS inside anionic AOT and cationic CTAB RMs; the ESPT dynamics approaches that of bulk water at higher w0 (≥10) inside AOT RM while no ESPT was observed for CTAB reverse micelle [ Sedgwick J. Am. Chem. Soc. 2012 , 134 , 11904 - 11907 ]. The ESPT dynamics inside BHDC RM is remarkably slower compared to that of water at all w0 (= [water]/[surfactant]) values and relatively much less sensitive to w0 variation compared to AOT RM. 2D NOESY and fluorescence anisotropy measurements reveal that the probe (HPTS) is embedded inside the positive interface of BHDC RM. Despite its trapped location, HPTS is able to undergo ESPT due to significant penetration of water molecules into the interface. Furthermore, facile ESPT at higher w0 is consistent with higher degree of interface hydration as predicted by a recent MD simulation [ Agazzi Langmuir 2014 , 30 , 9643 - 9653 ]. The study shows that ESPT dynamics inside RM varies not only with the interface charge but also on the nature of the headgroup and solvation.
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Affiliation(s)
- Aparajita Phukon
- Department of Chemistry, Indian Institute of Technology Guwahati , Guwahati 781039, Assam, India
| | - Nabajeet Barman
- Department of Chemistry, Indian Institute of Technology Guwahati , Guwahati 781039, Assam, India
| | - Kalyanasis Sahu
- Department of Chemistry, Indian Institute of Technology Guwahati , Guwahati 781039, Assam, India
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29
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Markaryan SA, Sarkisyan AR, Shaginyan GA. Effect of the dioctyl sodium sulfosuccinate (AOT) concentration on the properties of the AOT-n-heptane-DMSO-water micellar system. RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY A 2015. [DOI: 10.1134/s003602441509023x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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30
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Maity B, Chatterjee A, Ahmed SA, Seth D. Photophysics of crystal violet lactone in reverse micelles and its dual behaviour. RSC Adv 2015. [DOI: 10.1039/c5ra06309d] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
The photophysics of Crystal Violet Lactone (CVL) in aqueous and non aqueous reverse micelles (RMs) have been studied. It was observed that in RMs, the CTA → CTB transformation is retarded.
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Affiliation(s)
- Banibrata Maity
- Department of Chemistry
- Indian Institute of Technology Patna
- Patna 800013
- India
| | - Aninda Chatterjee
- Department of Chemistry
- Indian Institute of Technology Patna
- Patna 800013
- India
| | | | - Debabrata Seth
- Department of Chemistry
- Indian Institute of Technology Patna
- Patna 800013
- India
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31
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Yu X, Zou F, Yao P, Huang X, Qu Y. Gold nanoparticles tune the activity of laccase in anionic reverse micelles. SOFT MATTER 2014; 10:6425-6432. [PMID: 25046816 DOI: 10.1039/c4sm01127a] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
The interfacial property of reverse micelles is an important factor affecting the catalytic activity of enzymes hosted in the micelles. In this article, the effect of gold nanoparticles (GNPs) on the catalytic activity of laccase (non-surface-active enzyme) and the related mechanism are reported. It was found that laccase activity was dependent on the size of the particle and its concentration as well as on the water content and the concentration of AOT. It was shown that there existed several types of micelles in the present reverse micellar system in the presence of GNPs. The population of the various micelles depended on the concentrations of both GNPs and AOT. Fluorescence and circular dichroism spectra of laccase at different water contents and GNP concentrations indicated that the conformation of laccase and its activity were tuned by GNPs via changing the structure of the reverse micelles. Analysis showed that changes in the thickness of the water layer (Lw) and in the apparent occupied area of individual AOT molecules (AAOT) caused by GNPs were the main parameters affecting the activity of laccase. The present work extends and deepens the understanding of the tuning mechanism of GNPs on enzymatic performance in reverse micelles and provides guidance for rational design of the optimal microenvironment of laccase.
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Affiliation(s)
- Xinxin Yu
- Key Laboratory of Colloid & Interface Chemistry of the Education Ministry of China, Shandong University, No. 27 Shanda Nanlu, Jinan 250100, PR China.
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32
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Koninti RK, Gavvala K, Sengupta A, Hazra P. Excited State Proton Transfer Dynamics of Topotecan Inside Biomimicking Nanocavity. J Phys Chem B 2014; 119:2363-71. [DOI: 10.1021/jp5066902] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Raj Kumar Koninti
- Department
of Chemistry, Indian Institute of Science Education and Research (IISER), Pune 411008, Maharashtra, India
| | - Krishna Gavvala
- Department
of Chemistry, Indian Institute of Science Education and Research (IISER), Pune 411008, Maharashtra, India
| | - Abhigyan Sengupta
- Department
of Chemistry, Indian Institute of Science Education and Research (IISER), Pune 411008, Maharashtra, India
| | - Partha Hazra
- Department
of Chemistry, Indian Institute of Science Education and Research (IISER), Pune 411008, Maharashtra, India
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33
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Silva OF, Correa NM, Silber JJ, de Rossi RH, Fernández MA. Supramolecular assemblies obtained by mixing different cyclodextrins and AOT or BHDC reverse micelles. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2014; 30:3354-3362. [PMID: 24597759 DOI: 10.1021/la404584q] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
In this contribution we show the effect of the surfactant polar head and the external solvent on the incorporation of different cyclodextrins (CDs) {α-CD, β-CD, γ-CD, decenylsuccinyl-β-CD (Mod-β-CD), and hydroxypropyl-β-CD (hp-β-CD)} in different reverse micelles (RMs) {benzene/sodium 1,4-bis(2-ethylhexyl) sulfosuccinate(AOT)/water, and benzene/benzyl-n-hexadecyldimethylammonium chloride (BHDC)/water} and compare them with previous results obtained in n-heptane/AOT/water RMs. To investigate the different systems, we have used UV-vis spectrophotometry, induced circular dichroism spectroscopy (ICD), and the achiral molecular probe methyl orange (MO). The results show dramatic differences changing the external solvent and the surfactant, which are explained by considering the differences in the RMs interface composition, the water-surfactant interaction, and the CDs' location in the different media investigated. None of the CDs were incorporated into the benzene/AOT/water RMs at any [H2O]/[surfactant] ratio studied (W0) whereas it was previously shown that Mod-β-CD and hp-β-CD could be included in n-heptane/AOT/water RMs. However, all of the CDs are incorporated in benzene/BHDC/water RMs at W0 > 10 and hp-β-CD is dissolved even at W0 = 0. Different from what was found in n-heptane/AOT RMs, in BHDC RMs MO showed ICD signals with two different CDs: Mod-β-CD and hp-β-CD. The results are explained by considering the known difference in the interfacial water structure for AOT and BHDC RMs and the electron-rich region on the secondary hydroxyl (wider side of the CDs), which helps to solubilize all CDs in BHDC. This study shows that chiral cyclodextrin could be available for a guest in an organic medium such as the RMs. Therefore we have created a potentially powerful nanoreactor with two different confined regions in the same aggregate: the polar core of the RMs and the chiral hydrophobic cavity of cyclodextrin.
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Affiliation(s)
- O Fernando Silva
- Instituto de Investigaciones en Físico-Química de Córdoba, INFIQC-CONICET, Facultad de Ciencias Químicas, Departamento de Química Orgánica, Universidad Nacional de Córdoba, Ciudad Universitaria , X5000HUA Córdoba, Argentina
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34
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Das K, Maiti S, Das PK. Probing enzyme location in water-in-oil microemulsion using enzyme-carbon dot conjugates. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2014; 30:2448-59. [PMID: 24528191 DOI: 10.1021/la403835h] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
This article delineates the formation and characterization of different enzyme-carbon dot conjugates in aqueous medium (pH = 7.0). We used soybean peroxidase (SBP), Chromobacterium viscosum (CV) lipase, trypsin, and cytochrome c (cyt c) for the formation of conjugate either with cationic carbon dot (CCD) or anionic carbon dot (ACD) depending on the overall charge of the protein at pH 7.0. These nanobioconjugates were used to probe the location of enzymes in water-in-oil (w/o) microemulsion. The size of the synthesized water-soluble carbon dots were of 2-3 nm with distinctive emission property. The formation of enzyme/protein-carbon dot conjugates in aqueous buffer was confirmed via fluorescence spectroscopy and zeta potential measurement, and the structural alteration of enzyme/protein was monitored by circular dichroism spectroscopy. Biocatalytic activities of protein/enzymes in conjugation with carbon dots were found to be decreased in aqueous phosphate buffer (pH 7.0, 25 mM). Interestingly, the catalytic activity of the nanobioconjugates of SBP, CV lipase, and cyt c did not reduce in cetyltrimethylammonium bromide (CTAB)-based reverse micelle. It indicates different localization of carbon dots and the enzymes inside the reverse micelle. The hydrophilic carbon dots always preferred to be located in the water pool of reverse micelle, and thus, enzyme must be located away from the water pool, which is the interface. However, in case of trypsin-carbon dot conjugate, the enzyme activity notably decreased in reverse micelle in the presence of carbon dot in a similar way that was observed in water. This implies that trypsin and carbon dots both must be located at the same place, which is the water pool of reverse micelle. Carbon dot induced deactivation was not observed for those enzymes which stay away from the water pool and localized at the interfacial domain while deactivation is observed for those enzymes which reside at the water pool. Thus, the location of enzymes in the microdomain of w/o microemulsion can be predicted by comparing the activity profile of enzyme-carbon dot conjugate in water and w/o microemulsion.
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Affiliation(s)
- Krishnendu Das
- Department of Biological Chemistry, Indian Association for the Cultivation of Science Jadavpur , Kolkata 700 032, India
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