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Freis B, Ramírez MDLÁ, Furgiuele S, Journe F, Cheignon C, Charbonnière LJ, Henoumont C, Kiefer C, Mertz D, Affolter-Zbaraszczuk C, Meyer F, Saussez S, Laurent S, Tasso M, Bégin-Colin S. Bioconjugation studies of an EGF-R targeting ligand on dendronized iron oxide nanoparticles to target head and neck cancer cells. Int J Pharm 2023; 635:122654. [PMID: 36720449 DOI: 10.1016/j.ijpharm.2023.122654] [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: 07/31/2022] [Revised: 01/20/2023] [Accepted: 01/23/2023] [Indexed: 01/31/2023]
Abstract
A major challenge in nanomedicine is designing nanoplatforms (NPFs) to selectively target abnormal cells to ensure early diagnosis and targeted therapy. Among developed NPFs, iron oxide nanoparticles (IONPs) are good MRI contrast agents and can be used for therapy by hyperthermia and as radio-sensitizing agents. Active targeting is a promising method for selective IONPs accumulation in cancer tissues and is generally performed by using targeting ligands (TL). Here, a TL specific for the epidermal growth factor receptor (EGFR) is bound to the surface of dendronized IONPs to produce nanostructures able to specifically recognize EGFR-positive FaDu and 93-Vu head and neck cancer cell lines. Several parameters were optimized to ensure a high coupling yield and to adequately quantify the amount of TL per nanoparticle. Nanostructures with variable amounts of TL on the surface were produced and evaluated for their potential to specifically target and be thereafter internalized by cells. Compared to the bare NPs, the presence of the TL at the surface was shown to be effective to enhance their internalization and to play a role in the total amount of iron present per cell.
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Affiliation(s)
- Barbara Freis
- Université de Strasbourg, CNRS, Institut de Physique et Chimie des Matériaux, UMR CNRS-UdS 7504, 23 Rue du Loess, BP 43, 67034 Strasbourg, France; Laboratoire de NMR et d'imagerie moléculaire, Université de Mons, Avenue Maistriau 19, 7000 Mons, Belgium
| | - María De Los Ángeles Ramírez
- Université de Strasbourg, CNRS, Institut de Physique et Chimie des Matériaux, UMR CNRS-UdS 7504, 23 Rue du Loess, BP 43, 67034 Strasbourg, France
| | - Sonia Furgiuele
- Department of Human Anatomy and Experimental Oncology, Faculty of Medicine, Research Institute for Health Sciences and Technology, University of Mons (UMONS), Avenue du Champ de Mars, 8, 7000 Mons, Belgium
| | - Fabrice Journe
- Department of Human Anatomy and Experimental Oncology, Faculty of Medicine, Research Institute for Health Sciences and Technology, University of Mons (UMONS), Avenue du Champ de Mars, 8, 7000 Mons, Belgium
| | - Clémence Cheignon
- Université de Strasbourg, CNRS, Institut Pluridisciplinaire Hubert Curien, UMR 7178, 25, rue Becquerel, 67087 Strasbourg, France
| | - Loïc J Charbonnière
- Université de Strasbourg, CNRS, Institut Pluridisciplinaire Hubert Curien, UMR 7178, 25, rue Becquerel, 67087 Strasbourg, France
| | - Céline Henoumont
- Laboratoire de NMR et d'imagerie moléculaire, Université de Mons, Avenue Maistriau 19, 7000 Mons, Belgium
| | - Celine Kiefer
- Université de Strasbourg, CNRS, Institut de Physique et Chimie des Matériaux, UMR CNRS-UdS 7504, 23 Rue du Loess, BP 43, 67034 Strasbourg, France
| | - Damien Mertz
- Université de Strasbourg, CNRS, Institut de Physique et Chimie des Matériaux, UMR CNRS-UdS 7504, 23 Rue du Loess, BP 43, 67034 Strasbourg, France
| | - Christine Affolter-Zbaraszczuk
- Inserm U1121, Centre de recherche en biomédecine de Strasbourg, 1 rue Eugène Boeckel, CS 60026, 67084 Strasbourg Cedex, France
| | - Florent Meyer
- Inserm U1121, Centre de recherche en biomédecine de Strasbourg, 1 rue Eugène Boeckel, CS 60026, 67084 Strasbourg Cedex, France
| | - Sven Saussez
- Department of Human Anatomy and Experimental Oncology, Faculty of Medicine, Research Institute for Health Sciences and Technology, University of Mons (UMONS), Avenue du Champ de Mars, 8, 7000 Mons, Belgium
| | - Sophie Laurent
- Laboratoire de NMR et d'imagerie moléculaire, Université de Mons, Avenue Maistriau 19, 7000 Mons, Belgium
| | - Mariana Tasso
- Université de Strasbourg, CNRS, Institut de Physique et Chimie des Matériaux, UMR CNRS-UdS 7504, 23 Rue du Loess, BP 43, 67034 Strasbourg, France; Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), Departamento de Química, Facultad de Ciencias Exactas, Universidad Nacional de La Plata - CONICET, Diagonal 113 y 64, 1900 La Plata, Argentina
| | - Sylvie Bégin-Colin
- Université de Strasbourg, CNRS, Institut de Physique et Chimie des Matériaux, UMR CNRS-UdS 7504, 23 Rue du Loess, BP 43, 67034 Strasbourg, France.
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2
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Mart M, Karakaya I, Jurczak J. DCC Mediated Direct Amidation of NSAID Naproxen, Ibuprofen and Ketoprofen with Secondary Amines. ChemistrySelect 2022. [DOI: 10.1002/slct.202202436] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Mehmet Mart
- Institute of Organic Chemistry Polish Academy of Sciences Kasprzaka, 44/52 01-224 Warsaw Poland
| | - Idris Karakaya
- Department of Chemistry College of Basic Sciences Gebze Technical University 41400 Gebze Turkey
| | - Janusz Jurczak
- Institute of Organic Chemistry Polish Academy of Sciences Kasprzaka, 44/52 01-224 Warsaw Poland
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3
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Víšová I, Houska M, Vaisocherová-Lísalová H. Biorecognition antifouling coatings in complex biological fluids: a review of functionalization aspects. Analyst 2022; 147:2597-2614. [PMID: 35621143 DOI: 10.1039/d2an00436d] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Recent progress in biointerface research has highlighted the role of antifouling functionalizable coatings in the development of advanced biosensors for point-of-care bioanalytical and biomedical applications dealing with real-world complex samples. The resistance to nonspecific adsorption promotes the biorecognition performance and overall increases the reliability and specificity of the analysis. However, the process of modification with biorecognition elements (so-called functionalization) may influence the resulting antifouling properties. The extent of these effects concerning both functionalization procedures potentially changing the surface architecture and properties, and the physicochemical properties of anchored biorecognition elements, remains unclear and has not been summarized in the literature yet. This critical review summarizes these key functionalization aspects with respect to diverse antifouling architectures showing low or ultra-low fouling quantitative characteristics in complex biological media such as bodily fluids or raw food samples. The subsequent discussion focuses on the impact of functionalization on fouling resistance. Furthermore, this review discusses some of the drawbacks of available surface sensitive characterization methods and highlights the importance of suitable assessment of the resistance to fouling.
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Affiliation(s)
- Ivana Víšová
- Institute of Physics of the Czech Academy of Sciences, Na Slovance 1999/2, 182 21 Prague 8, Czech Republic.
| | - Milan Houska
- Institute of Physics of the Czech Academy of Sciences, Na Slovance 1999/2, 182 21 Prague 8, Czech Republic.
| | - Hana Vaisocherová-Lísalová
- Institute of Physics of the Czech Academy of Sciences, Na Slovance 1999/2, 182 21 Prague 8, Czech Republic.
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4
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Ghosh S, Tran PN, McElheny D, Perez JJ, Nguyen AI. Peptidic Scaffolds Enable Rapid and Multivariate Secondary Sphere Evolution for an Abiotic Metallocatalyst. Inorg Chem 2022; 61:6679-6687. [PMID: 35446044 DOI: 10.1021/acs.inorgchem.2c00901] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Metalloenzymes have benefited from the iterative process of evolution to achieve the precise arrangements of secondary sphere non-covalent interactions that enhance metal-centered catalysis. Iterative synthesis of scaffolds that display complex secondary sphere elements in abiotic systems can be highly challenging and time-intensive. To overcome this synthetic bottleneck, we developed a highly modular and rapid synthetic strategy, leveraging the efficiency of solid-phase peptide synthesis and conformational control afforded by non-canonical residues to construct a ligand platform displaying up to four unique residues of varying electronics and sterics in the secondary coordination sphere. As a proof-of-concept that peptidic secondary sphere can cooperate with the metal complex, we applied this scaffold to a well-known, modestly active C-H oxidizing Fe catalyst to evolve specific non-covalent interactions that is more than double its catalytic activity. Solution-state NMR structures of several catalyst variants suggest that higher activity is correlated with a hydrophobic pocket above the Fe center that may enhance the formation of a catalyst-substrate complex. Above all, we show that peptides are a convenient, highly modular, and structurally defined ligand platform for creating secondary coordination spheres that comprise multiple, diverse functional groups.
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Affiliation(s)
- Sabari Ghosh
- Department of Chemistry, University of Illinois at Chicago, Chicago, Illinois 60607, United States
| | - Phuong Nguyen Tran
- Department of Chemistry, University of Illinois at Chicago, Chicago, Illinois 60607, United States
| | - Dan McElheny
- Department of Chemistry, University of Illinois at Chicago, Chicago, Illinois 60607, United States
| | - Juan J Perez
- Department of Chemistry, University of Illinois at Chicago, Chicago, Illinois 60607, United States
| | - Andy I Nguyen
- Department of Chemistry, University of Illinois at Chicago, Chicago, Illinois 60607, United States
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5
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Kaushik J, Tripathi KM, Singh R, Sonkar SK. Thiourea-functionalized graphene aerogel for the aqueous phase sensing of toxic Pb(II) metal ions and H 2O 2. CHEMOSPHERE 2022; 287:132105. [PMID: 34826890 DOI: 10.1016/j.chemosphere.2021.132105] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/26/2021] [Revised: 08/06/2021] [Accepted: 08/29/2021] [Indexed: 06/13/2023]
Abstract
A simpler approach of functionalization for the fabrication of thiourea-functionalized-Graphene Aerogel (t-GA) is described here. Graphene Aerogel (GA) was synthesized from bio-mass, which on a simpler oxidative treatment get converted to its water-soluble version due to the impregnation of several oxygenous functionalities like carboxylic, hydroxyl, etc. Further, these carboxylated groups have been functionalized with the molecules of thiourea using the long known dicyclohexylcarbodiimide (DCC) as a coupling agent. The as-synthesized t-GA shows bright yellow fluorescence with a quantum yield of ~3% and holds the high-aqueous solubility and photostability. The fluorescence property of t-GA has been used here for the specific and selective sensing of toxic lead (Pb(II)) metal ions from the used many other metal ions via the fluorescence quenching and showed a limit of detection ~7.3 nM. Further, the mechanism for selective sensing was studied in detail and found to be preferable via ligand to metal charge transfer quenching mechanism. The cyclic voltammetry studies supported the selective sensing of Pb(II). Moreover, t-GA has also been studied for the sensing of hydrogen peroxide and as a yellow fluorescent ink.
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Affiliation(s)
- Jaidev Kaushik
- Department of Chemistry, Malaviya National Institute of Technology Jaipur, Jaipur, 302017, Rajasthan, India
| | - Kumud Malika Tripathi
- Department of Chemistry, Indian Institute of Petroleum and Energy, Visakhapatnam, 530003, Andhra Pradesh, India
| | - Ravindra Singh
- Department of Chemistry, Maharani Shri Jaya Government Post-Graduate College, Bharatpur, Rajasthan, 321001, India
| | - Sumit Kumar Sonkar
- Department of Chemistry, Malaviya National Institute of Technology Jaipur, Jaipur, 302017, Rajasthan, India.
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6
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Jayalath IM, Gerken MM, Mantel G, Hartley CS. Substituent Effects on Transient, Carbodiimide-Induced Geometry Changes in Diphenic Acids. J Org Chem 2021; 86:12024-12033. [PMID: 34409831 DOI: 10.1021/acs.joc.1c01385] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
Nucleotide-induced conformational changes in motor proteins are key to many important cell functions. Inspired by this biological behavior, we report a simple chemically fueled system that exhibits carbodiimide-induced geometry changes. Bridging via transient anhydride formation leads to a significant reduction of the twist about the biaryl bond of substituted diphenic acids, giving a simple molecular clamp. The kinetics are well-described by a simple mechanism, allowing structure-property effects to be determined. The kinetic parameters can be used to derive important characteristics of the system such as the efficiencies (anhydride yields), maximum anhydride concentrations, and overall lifetimes. Transient diphenic anhydrides tolerate steric hindrance ortho to the biaryl bond but are significantly affected by electronic effects, with electron-deficient substituents giving lower yields, peak conversions, and lifetimes. The results provide useful guidelines for the design of functional systems incorporating diphenic acid units.
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Affiliation(s)
- Isuru M Jayalath
- Department of Chemistry & Biochemistry, Miami University, Oxford, Ohio 45056, United States
| | - Madelyn M Gerken
- Department of Chemistry & Biochemistry, Miami University, Oxford, Ohio 45056, United States
| | - Georgia Mantel
- Department of Chemistry & Biochemistry, Miami University, Oxford, Ohio 45056, United States
| | - C Scott Hartley
- Department of Chemistry & Biochemistry, Miami University, Oxford, Ohio 45056, United States
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7
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Lin X, O'Reilly Beringhs A, Lu X. Applications of Nanoparticle-Antibody Conjugates in Immunoassays and Tumor Imaging. AAPS J 2021; 23:43. [PMID: 33718979 PMCID: PMC7956929 DOI: 10.1208/s12248-021-00561-5] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2020] [Accepted: 01/20/2021] [Indexed: 02/06/2023] Open
Abstract
Modern diagnostic technologies rely on both in vitro and in vivo modalities to provide a complete understanding of the clinical state of a patient. Nanoparticle-antibody conjugates have emerged as promising systems to confer increased sensitivity and accuracy for in vitro diagnostics (e.g., immunoassays). Meanwhile, in vivo applications have benefited from the targeting ability of nanoparticle-antibody conjugates, as well as payload flexibility and tailored biodistribution. This review provides an encompassing overview of nanoparticle-antibody conjugates, from chemistry to applications in medical immunoassays and tumor imaging, highlighting the underlying principles and unique features of relevant preclinical applications employing commonly used imaging modalities (e.g., optical/photoacoustics, positron-emission tomography, magnetic resonance imaging, X-ray computed tomography).
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Affiliation(s)
- Xinhao Lin
- Department of Pharmaceutical Sciences, University of Connecticut, Storrs, Connecticut, USA
| | | | - Xiuling Lu
- Department of Pharmaceutical Sciences, University of Connecticut, Storrs, Connecticut, USA.
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8
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Borsley S, Leigh DA, Roberts BMW. A Doubly Kinetically-Gated Information Ratchet Autonomously Driven by Carbodiimide Hydration. J Am Chem Soc 2021; 143:4414-4420. [DOI: 10.1021/jacs.1c01172] [Citation(s) in RCA: 25] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- Stefan Borsley
- Department of Chemistry, University of Manchester, Oxford Road, Manchester M13 9PL, United Kingdom
| | - David A. Leigh
- Department of Chemistry, University of Manchester, Oxford Road, Manchester M13 9PL, United Kingdom
| | - Benjamin M. W. Roberts
- Department of Chemistry, University of Manchester, Oxford Road, Manchester M13 9PL, United Kingdom
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9
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Muthuvinothini A, Stella S. L-Cysteine capped Zn nanoparticles catalyzed synthesis of guanidines. SYNTHETIC COMMUN 2020. [DOI: 10.1080/00397911.2020.1837169] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Affiliation(s)
- Alagesan Muthuvinothini
- Department of Chemistry & Research Centre, Sarah Tucker College (Autonomous), Manonmaniam Sundaranar University, Tirunelveli, TN, India
| | - Selvaraj Stella
- Department of Chemistry & Research Centre, Sarah Tucker College (Autonomous), Manonmaniam Sundaranar University, Tirunelveli, TN, India
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10
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Bicego R, Francisco A, Ruas JS, Siqueira-Santos ES, Castilho RF. Undesirable effects of chemical inhibitors of NAD(P) + transhydrogenase on mitochondrial respiratory function. Arch Biochem Biophys 2020; 692:108535. [PMID: 32781052 DOI: 10.1016/j.abb.2020.108535] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2020] [Accepted: 07/31/2020] [Indexed: 10/23/2022]
Abstract
NAD(P)+ transhydrogenase (NNT) is located in the inner mitochondrial membrane and catalyzes a reversible hydride transfer between NAD(H) and NADP(H) that is coupled to proton translocation between the intermembrane space and mitochondrial matrix. NNT activity has an essential role in maintaining the NADPH supply for antioxidant defense and biosynthetic pathways. In the present report, we evaluated the effects of chemical compounds used as inhibitors of NNT over the last five decades, namely, 4-chloro-7-nitrobenzofurazan (NBD-Cl), N,N'-dicyclohexylcarbodiimide (DCC), palmitoyl-CoA, palmitoyl-l-carnitine, and rhein, on NNT activity and mitochondrial respiratory function. Concentrations of these compounds that partially inhibited the forward and reverse NNT reactions in detergent-solubilized mouse liver mitochondria significantly impaired mitochondrial respiratory function, as estimated by ADP-stimulated and nonphosphorylating respiration. Among the tested compounds, NBD-Cl showed the best relationship between NNT inhibition and low impact on respiratory function. Despite this, NBD-Cl concentrations that partially inhibited NNT activity impaired mitochondrial respiratory function and significantly decreased the viability of cultured Nnt-/- mouse astrocytes. We conclude that even though the tested compounds indeed presented inhibitory effects on NNT activity, at effective concentrations, they cause important undesirable effects on mitochondrial respiratory function and cell viability.
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Affiliation(s)
- Rafaela Bicego
- Department of Clinical Pathology, Faculty of Medical Sciences, University of Campinas (UNICAMP), Campinas, SP, Brazil
| | - Annelise Francisco
- Department of Clinical Pathology, Faculty of Medical Sciences, University of Campinas (UNICAMP), Campinas, SP, Brazil.
| | - Juliana S Ruas
- Department of Clinical Pathology, Faculty of Medical Sciences, University of Campinas (UNICAMP), Campinas, SP, Brazil
| | - Edilene S Siqueira-Santos
- Department of Clinical Pathology, Faculty of Medical Sciences, University of Campinas (UNICAMP), Campinas, SP, Brazil
| | - Roger F Castilho
- Department of Clinical Pathology, Faculty of Medical Sciences, University of Campinas (UNICAMP), Campinas, SP, Brazil.
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Kariyawasam LS, Kron JC, Jiang R, Sommer AJ, Hartley CS. Structure-Property Effects in the Generation of Transient Aqueous Benzoic Acid Anhydrides by Carbodiimide Fuels. J Org Chem 2019; 85:682-690. [PMID: 31834799 DOI: 10.1021/acs.joc.9b02746] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
The design of dissipative systems, which operate out-of-equilibrium by consuming chemical fuels, is challenging. As yet, there are a few examples of privileged fuel chemistries that can be broadly applied in abiotic systems in the same way that ATP hydrolysis is exploited throughout biochemistry. The key issue is that designing nonequilibrium systems is inherently about balancing the relative rates of coupled reactions. The use of carbodiimides as fuels to generate transient aqueous carboxylic anhydrides has recently been used in examples of new nonequilibrium materials and supramolecular assemblies. Here, we explore the kinetics of formation and decomposition of a series of benzoic anhydrides generated from the corresponding acids and EDC under typical conditions (EDC = N-(3-dimethylaminopropyl)-N'-ethylcarbodiimide hydrochloride). The reactions can be described by a simple mechanism that merges known behavior for the two processes independently. Structure-property effects in these systems are dominated by differences in the anhydride decomposition rate. The kinetic parameters allow trends in concentration-dependent properties to be simulated, such as reaction lifetimes, peak anhydride concentrations, and yields. For key properties, there are diminishing returns with the addition of increasing amounts of fuel. These results should provide useful guidelines for the design of functional systems making use of this chemistry.
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Affiliation(s)
- Lasith S Kariyawasam
- Department of Chemistry & Biochemistry , Miami University , Oxford , Ohio 45056 , United States
| | - Julie C Kron
- Department of Chemistry & Biochemistry , Miami University , Oxford , Ohio 45056 , United States
| | - Run Jiang
- Department of Chemistry & Biochemistry , Miami University , Oxford , Ohio 45056 , United States
| | - André J Sommer
- Department of Chemistry & Biochemistry , Miami University , Oxford , Ohio 45056 , United States
| | - C Scott Hartley
- Department of Chemistry & Biochemistry , Miami University , Oxford , Ohio 45056 , United States
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12
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Pramanik K, Sarkar P, Bhattacharyay D. 3‑Mercapto‑propanoic acid modified cellulose filter paper for quick removal of arsenate from drinking water. Int J Biol Macromol 2019; 122:185-194. [PMID: 30340008 DOI: 10.1016/j.ijbiomac.2018.10.065] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2018] [Revised: 10/12/2018] [Accepted: 10/14/2018] [Indexed: 11/20/2022]
Abstract
This paper reports a simple, facile and rapid preparation of 3‑mercapto‑propanoic acid (MPA) modified cellulose filter paper (MPA-Cell paper) for arsenate removal from drinking water. The MPA was covalently grafted to the cellulose filter paper (Cell) by esterification process through the formation of O‑acylisourea intermediate and characterized by the FTIR, SEM, EDS and XPS analyses. The arsenate adsorption efficiency was studied for batch and semi-continuous systems while exploring the adsorption kinetics, isotherm and the effect of pH for the former. The experimental data fitted well with Langmuir, Dubinin-Radushkevich (DR) and pseudo second order kinetic models. The mechanism of adsorption was studied by FTIR spectroscopy utilizing the adsorption isotherm, kinetic model and XPS results. The modified filter paper performed well at nearly neutral pH in arsenate removal through adsorption and demonstrated a significant arsenate uptake capacity of 92.59 mg/g. The DR and FTIR results indicated that the adsorption of arsenate ion occurred through ion exchange process. The MPA-Cell paper could have a potential use as low-cost but efficient commercial adsorbent for arsenate abatement from contaminated drinking water by both batch as well as semi-continuous operating systems. The MPA-Cell paper could purify ground water containing high level of arsenate.
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Affiliation(s)
- Krishnendu Pramanik
- Biosensor Laboratory, Department of Polymer Science and Technology, University of Calcutta, 92 A.P.C. Road, Kolkata 700009, West Bengal, India; Department of Chemical Engineering, Calcutta Institute of Technology, Banitabla, Howrah 711316, West Bengal, India
| | - Priyabrata Sarkar
- Department of Chemical Engineering, Calcutta Institute of Technology, Banitabla, Howrah 711316, West Bengal, India.
| | - Dipankar Bhattacharyay
- Department of Chemical Engineering, Calcutta Institute of Technology, Banitabla, Howrah 711316, West Bengal, India
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13
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14
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Ayrton ST, Chen X, Bain RM, Pulliam CJ, Achmatowicz M, Flick TG, Ren D, Cooks RG. Gas Phase Ion Chemistry to Determine Isoaspartate in a Peptide Backbone. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2018; 29:1339-1344. [PMID: 29546595 DOI: 10.1007/s13361-018-1923-0] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/04/2018] [Revised: 02/06/2018] [Accepted: 02/07/2018] [Indexed: 06/08/2023]
Abstract
Proof of concept evidence is presented for a new method for the determination of isoaspartate, an important post-translational modification. Chemical derivatization is performed using common reagents for the modification of carboxylic acids and shown to yield suitable diagnostic information with regard to isomerization at the aspartate residue. The diagnostic gas phase chemistry is probed by collision-induced dissociation mass spectrometry, on the timescale of the MS experiment and semi-quantitative calibration of the percentage of isoaspartate in a peptide sample is demonstrated. Graphical Abstract ᅟ.
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Affiliation(s)
- S T Ayrton
- Department of Chemistry, Purdue University, 560 Oval Drive, West Lafayette, IN, 47907, USA
| | - X Chen
- Department of Chemistry, Purdue University, 560 Oval Drive, West Lafayette, IN, 47907, USA
| | - R M Bain
- Department of Chemistry, Purdue University, 560 Oval Drive, West Lafayette, IN, 47907, USA
| | - C J Pulliam
- Department of Chemistry, Purdue University, 560 Oval Drive, West Lafayette, IN, 47907, USA
| | - M Achmatowicz
- Department of Analytical Research & Development, Amgen Inc., 1 Amgen Center Drive, Thousand Oaks, CA, 91320, USA
| | - T G Flick
- Department of Analytical Research & Development, Amgen Inc., 1 Amgen Center Drive, Thousand Oaks, CA, 91320, USA
| | - D Ren
- Department of Analytical Research & Development, Amgen Inc., 1 Amgen Center Drive, Thousand Oaks, CA, 91320, USA
| | - R G Cooks
- Department of Chemistry, Purdue University, 560 Oval Drive, West Lafayette, IN, 47907, USA.
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15
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Ferreira G, Costa C, Bassaizteguy V, Santos M, Cardozo R, Montes J, Settineri R, Nicolson GL. Incubation of human sperm with micelles made from glycerophospholipid mixtures increases sperm motility and resistance to oxidative stress. PLoS One 2018; 13:e0197897. [PMID: 29856778 PMCID: PMC5984032 DOI: 10.1371/journal.pone.0197897] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2018] [Accepted: 05/10/2018] [Indexed: 12/31/2022] Open
Abstract
Membrane integrity is essential in maintaining sperm viability, signaling, and motility, which are essential for fertilization. Sperm are highly susceptible to oxidative stress, as they are rich in sensitive polyunsaturated fatty acids (PUFA), and are unable to synthesize and repair many essential membrane constituents. Because of this, sperm cellular membranes are important targets of this process. Membrane Lipid Replacement (MLR) with glycerophospholipid mixtures (GPL) has been shown to ameliorate oxidative stress in cells, restore their cellular membranes, and prevent loss of function. Therefore, we tested the effects of MLR on sperm by tracking and monitoring GPL incorporation into their membrane systems and studying their effects on sperm motility and viability under different experimental conditions. Incubation of sperm with mixtures of exogenous, unoxidized GPL results in their incorporation into sperm membranes, as shown by the use of fluorescent dyes attached to GPL. The percent overall (total) sperm motility was increased from 52±2.5% to 68±1.34% after adding GPL to the incubation media, and overall sperm motility was recovered from 7±2% after H2O2 treatment to 58±2.5%)(n = 8, p<0.01) by the incorporation of GPL into sperm membranes. When sperm were exposed to H2O2, the mitochondrial inner membrane potential (MIMP), monitored using the MIMP tracker dye JC-1 in flow cytometry, diminished, whereas the addition of GPL prevented the decrease in MIMP. Confocal microscopy with Rhodamine-123 and JC-1 confirmed the mitochondrial localization of the dyes. We conclude that incubation of human sperm with glycerolphospholipids into the membranes of sperm improves sperm viability, motility, and resistance to oxidizing agents like H2O2. This suggests that human sperm might be useful to test innovative new treatments like MLR, since such treatments could improve fertility when it is adversely affected by increased oxidative stress.
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Affiliation(s)
- Gonzalo Ferreira
- Departamento de Biofísica, Laboratorio de Canales Iónicos y Señalización Celular, Facultad de Medicina, Universidad de la República, Montevideo, Uruguay
| | - Carlos Costa
- Departamento de Biofísica, Laboratorio de Canales Iónicos y Señalización Celular, Facultad de Medicina, Universidad de la República, Montevideo, Uruguay
| | - Verónica Bassaizteguy
- Departamento de Biofísica, Laboratorio de Canales Iónicos y Señalización Celular, Facultad de Medicina, Universidad de la República, Montevideo, Uruguay
| | - Marcelo Santos
- Departamento de Biofísica, Laboratorio de Canales Iónicos y Señalización Celular, Facultad de Medicina, Universidad de la República, Montevideo, Uruguay
| | - Romina Cardozo
- Departamento de Biofísica, Laboratorio de Canales Iónicos y Señalización Celular, Facultad de Medicina, Universidad de la República, Montevideo, Uruguay
| | | | - Robert Settineri
- Sierra Productions Research, LLC, Irvine, California, United States of America
| | - Garth L. Nicolson
- Dept. of Molecular Pathology, The Institute for Molecular Medicine, Huntington Beach, California, United States of America
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16
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Badland M, Crook R, Delayre B, Fussell SJ, Gladwell I, Hawksworth M, Howard RM, Walton R, Weisenburger GA. A comparative study of amide-bond forming reagents in aqueous media – Substrate scope and reagent compatibility. Tetrahedron Lett 2017. [DOI: 10.1016/j.tetlet.2017.10.014] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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17
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Psarra E, König U, Müller M, Bittrich E, Eichhorn KJ, Welzel PB, Stamm M, Uhlmann P. In Situ Monitoring of Linear RGD-Peptide Bioconjugation with Nanoscale Polymer Brushes. ACS OMEGA 2017; 2:946-958. [PMID: 31457480 PMCID: PMC6641180 DOI: 10.1021/acsomega.6b00450] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/01/2016] [Accepted: 02/24/2017] [Indexed: 05/04/2023]
Abstract
Bioinspired materials mimicking the native extracellular matrix environment are promising for biotechnological applications. Particularly, modular biosurface engineering based on the functionalization of stimuli-responsive polymer brushes with peptide sequences can be used for the development of smart surfaces with biomimetic cues. The key aspect of this study is the in situ monitoring and analytical verification of the biofunctionalization process on the basis of three complementary analytical techniques. In situ spectroscopic ellipsometry was used to quantify the amount of chemisorbed GRGDS at both the homopolymer poly(acrylic acid) (PAA) brush and the binary poly(N-isopropylacrylamide) (PNIPAAm)-PAA brushes, which was finally confirmed by an acidic hydrolysis combined with a subsequent reverse-phase high-performance liquid chromatography analysis. In situ attenuated total reflection-Fourier transform infrared spectroscopy provided a step-by-step detection of the biofunctionalization process so that an optimized protocol for the bioconjugation of GRGDS could be identified. The optimized protocol was used to create a temperature-responsive binary brush with a high amount of chemisorbed GRGDS, which is a promising candidate for the temperature-sensitive control of GRGDS presentation in further cell-instructive studies.
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Affiliation(s)
- Evmorfia Psarra
- Leibniz
Institute of Polymer Research Dresden, Hohe Street 6, 01069 Dresden, Germany
- Department
of Chemistry, Hamilton Hall, University
of Nebraska-Lincoln, 639 North 12th Street, Lincoln, Nebraska 68588, United
States
| | - Ulla König
- Leibniz
Institute of Polymer Research Dresden, Hohe Street 6, 01069 Dresden, Germany
| | - Martin Müller
- Leibniz
Institute of Polymer Research Dresden, Hohe Street 6, 01069 Dresden, Germany
| | - Eva Bittrich
- Leibniz
Institute of Polymer Research Dresden, Hohe Street 6, 01069 Dresden, Germany
| | - Klaus-Jochen Eichhorn
- Leibniz
Institute of Polymer Research Dresden, Hohe Street 6, 01069 Dresden, Germany
| | - Petra B. Welzel
- Leibniz
Institute of Polymer Research Dresden, Hohe Street 6, 01069 Dresden, Germany
| | - Manfred Stamm
- Leibniz
Institute of Polymer Research Dresden, Hohe Street 6, 01069 Dresden, Germany
- Faculty
of Science, Department of Chemistry, Chair of Physical Chemistry of
Polymeric Materials, Technische Universität
Dresden, Bergstr. 66, 01069 Dresden, Germany
| | - Petra Uhlmann
- Leibniz
Institute of Polymer Research Dresden, Hohe Street 6, 01069 Dresden, Germany
- Department
of Chemistry, Hamilton Hall, University
of Nebraska-Lincoln, 639 North 12th Street, Lincoln, Nebraska 68588, United
States
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18
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Schramm MP, Kanaura M, Ito K, Ide M, Iwasawa T. Introverted Phosphorus-Au Cavitands for Catalytic Use. European J Org Chem 2015. [DOI: 10.1002/ejoc.201501426] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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19
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Yan Q, Zheng HN, Jiang C, Li K, Xiao SJ. EDC/NHS activation mechanism of polymethacrylic acid: anhydride versus NHS-ester. RSC Adv 2015. [DOI: 10.1039/c5ra13844b] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
Both stable intermediates of anhydride and NHS-ester were observed after EDC/NHS activation of PMAA, where NHS-ester waxes, while anhydride wanes complementarily with increasing fragmentation degree of PMAA blocks in PMAA-associated polymer blends.
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Affiliation(s)
- Qin Yan
- State Key Laboratory of Coordination Chemistry
- School of Chemistry and Chemical Engineering
- Nanjing University
- Nanjing 210093
- China
| | - Hong-Ning Zheng
- State Key Laboratory of Coordination Chemistry
- School of Chemistry and Chemical Engineering
- Nanjing University
- Nanjing 210093
- China
| | - Chuan Jiang
- State Key Laboratory of Coordination Chemistry
- School of Chemistry and Chemical Engineering
- Nanjing University
- Nanjing 210093
- China
| | - Kun Li
- State Key Laboratory of Coordination Chemistry
- School of Chemistry and Chemical Engineering
- Nanjing University
- Nanjing 210093
- China
| | - Shou-Jun Xiao
- State Key Laboratory of Coordination Chemistry
- School of Chemistry and Chemical Engineering
- Nanjing University
- Nanjing 210093
- China
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20
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Ohashi K, Ito K, Iwasawa T. Self-Folded Silyl Cavitands with In- and Outwardly Directed Allyl Groups. European J Org Chem 2014. [DOI: 10.1002/ejoc.201301843] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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21
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Xie Y, Pan H. Regioselective Acetylate of 1,3-Disubstituted Selenoureas Promoted by Recyclable Ion-Supported Hypervalent Iodine(III) Reagent. PHOSPHORUS SULFUR 2013. [DOI: 10.1080/10426507.2013.797418] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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22
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Kalamkar V, Joshi M, Borkar V, Srivastava S, Kanyalkar M. Intermolecular interaction of voriconazole analogues with model membrane by DSC and NMR, and their antifungal activity using NMR based metabolic profiling. Bioorg Med Chem 2013; 21:6753-62. [PMID: 24012381 DOI: 10.1016/j.bmc.2013.08.004] [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: 06/01/2013] [Revised: 08/01/2013] [Accepted: 08/02/2013] [Indexed: 10/26/2022]
Abstract
The development of novel antifungal agents with high susceptibility and increased potency can be achieved by increasing their overall lipophilicity. To enhance the lipophilicity of voriconazole, a second generation azole antifungal agent, we have synthesized its carboxylic acid ester analogues, namely p-methoxybenzoate (Vpmb), toluate (Vtol), benzoate (Vbz) and p-nitrobenzoate (Vpnb). The intermolecular interactions of these analogues with model membrane have been investigated using nuclear magnetic resonance (NMR) and differential scanning calorimetric (DSC) techniques. The results indicate varying degree of changes in the membrane bilayer's structural architecture and physico-chemical characteristics which possibly can be correlated with the antifungal effects via fungal membrane. Rapid metabolite profiling of chemical entities using cell preparations is one of the most important steps in drug discovery. We have evaluated the effect of synthesized analogues on Candida albicans. The method involves real time (1)H NMR measurement of intact cells monitoring NMR signals from fungal metabolites which gives Metabolic End Point (MEP). This is then compared with Minimum Inhibitory Concentration (MIC) determined using conventional methods. Results indicate that one of the synthesized analogues, Vpmb shows reasonably good activity.
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Affiliation(s)
- Vaibhav Kalamkar
- Prin K.M. Kundnani College of Pharmacy, Plot 23, Jyot Joy Building, Rambhau Salgaonkar Marg, Cuffe Parade, Mumbai 400005, India
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23
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Darlington DN, Gonzales MD. HPLC DETERMINATION OF VALPROIC ACID IN PLASMA BY CONJUGATION TO A HYDRAZIDE. J LIQ CHROMATOGR R T 2013. [DOI: 10.1080/10826076.2012.717059] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Affiliation(s)
| | - Mary D. Gonzales
- a US Army Institute of Surgical Research , San Antonio , Texas , USA
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24
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Piras AM, Dessy A, Dinucci D, Chiellini F. 2-Methoxy Aniline Grafted Poly(maleic anhydride-alt-butyl vinyl ether) Hemiester: A New Biocompatible Polymeric Free Radical Scavenger. Macromolecules 2011. [DOI: 10.1021/ma102309m] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Anna Maria Piras
- Laboratory of Bioactive Polymeric Materials for Biomedical and Environmental Applications (BIOlab), UdR INSTM, Department of Chemistry & Industrial Chemistry, University of Pisa, Pisa, Italy
| | - Alberto Dessy
- Laboratory of Bioactive Polymeric Materials for Biomedical and Environmental Applications (BIOlab), UdR INSTM, Department of Chemistry & Industrial Chemistry, University of Pisa, Pisa, Italy
| | - Dinuccio Dinucci
- Laboratory of Bioactive Polymeric Materials for Biomedical and Environmental Applications (BIOlab), UdR INSTM, Department of Chemistry & Industrial Chemistry, University of Pisa, Pisa, Italy
| | - Federica Chiellini
- Laboratory of Bioactive Polymeric Materials for Biomedical and Environmental Applications (BIOlab), UdR INSTM, Department of Chemistry & Industrial Chemistry, University of Pisa, Pisa, Italy
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25
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Marcelli T, Olimpieri F, Volonterio A. Domino synthesis of 1,3,5-trisubstituted hydantoins: a DFT study. Org Biomol Chem 2011; 9:5156-61. [DOI: 10.1039/c1ob05242j] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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26
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Liu S, Gan H, Hermann AT, Rick SW, Gibb BC. Kinetic resolution of constitutional isomers controlled by selective protection inside a supramolecular nanocapsule. Nat Chem 2010; 2:847-52. [PMID: 20861900 DOI: 10.1038/nchem.751] [Citation(s) in RCA: 99] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2010] [Accepted: 06/14/2010] [Indexed: 11/09/2022]
Abstract
The concept of self-assembling container molecules as yocto-litre reaction flasks is gaining prominence. However, the idea of using such containers as a means of protection is not well developed. Here, we illustrate this idea in the context of kinetic resolutions. Specifically, we report on the use of a water-soluble, deep-cavity cavitand to bring about kinetic resolutions within pairs of esters that otherwise cannot be resolved because they react at very similar rates. Resolution occurs because the presence of the cavitand leads to a competitive binding equilibrium in which the stronger binder primarily resides inside the host and the weaker binding ester primarily resides in the bulk hydrolytic medium. For the two families of ester examined, the observed kinetic resolutions were highest within the optimally fitting smaller esters.
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Affiliation(s)
- Simin Liu
- Department of Chemistry, University of New Orleans, New Orleans, Louisiana 70148, USA
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27
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On-line analysis of volatile fatty acids in anaerobic treatment processes. Anal Chim Acta 2010; 668:74-9. [DOI: 10.1016/j.aca.2009.12.019] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2009] [Revised: 12/08/2009] [Accepted: 12/15/2009] [Indexed: 11/22/2022]
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28
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Lledó A, Rebek J. Self-folding cavitands: structural characterization of the induced-fit model. Chem Commun (Camb) 2010; 46:1637-9. [PMID: 20177600 DOI: 10.1039/b927031k] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Deletion of structural elements in cavitand receptors is used to evaluate the thermodynamic and kinetic parameters of binding in these hosts. The use of a bulky guest showcases the importance of host-guest shape adaptations in the molecular recognition process.
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Affiliation(s)
- Agustí Lledó
- The Skaggs Institute for Chemical Biology and Department of Chemistry, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA
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29
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Sam S, Touahir L, Salvador Andresa J, Allongue P, Chazalviel JN, Gouget-Laemmel AC, Henry de Villeneuve C, Moraillon A, Ozanam F, Gabouze N, Djebbar S. Semiquantitative study of the EDC/NHS activation of acid terminal groups at modified porous silicon surfaces. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2010; 26:809-14. [PMID: 19725548 DOI: 10.1021/la902220a] [Citation(s) in RCA: 214] [Impact Index Per Article: 15.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Abstract
Infrared spectroscopy is used to investigate the transformation of carboxyl-terminated alkyl chains immobilized on a surface into succinimidyl ester-terminated chains by reaction with an aqueous solution of N-ethyl-N'-(3-(dimethylamino)propyl)carbodiimide (EDC) and N-hydroxysuccinimide (NHS). The acid chains are covalently grafted at the surface of hydrogenated porous silicon whose large specific surface area allows for assessing the activation yield in a semiquantitative way by infrared (IR) spectroscopy and detecting trace amounts of surface products and/or reaction products of small IR cross section. In this way, we rationalize the different reaction paths and optimize the reaction conditions to obtain as pure as possible succinimidyl ester-terminated surfaces. A diagram mapping the surface composition after activation was constructed by systematically varying the solution composition. Results are accounted for by NHS surface adsorption and a kinetic competition between the various EDC-induced surface reactions.
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Affiliation(s)
- S Sam
- Physique de la Matière Condensée, Ecole Polytechnique, CNRS, 91128 Palaiseau, France
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30
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Takabayashi S, Okamoto K, Motoyama H, Nakatani T, Sakaue H, Takahagi T. X-ray photoelectron analysis of surface functional groups on diamond-like carbon films by gas-phase chemical derivatization method. SURF INTERFACE ANAL 2010. [DOI: 10.1002/sia.3156] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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31
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Xiao S, Ajami D, Rebek Jr. J. An extended cavitand with an introverted carboxylic acid. Chem Commun (Camb) 2010; 46:2459-61. [DOI: 10.1039/b926072b] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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32
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Adediran SA, Day TP, Sil D, Kimbrell MR, Warshakoon HJ, Malladi SS, David SA. Synthesis of a highly water-soluble derivative of amphotericin B with attenuated proinflammatory activity. Mol Pharm 2009; 6:1582-90. [PMID: 19663403 PMCID: PMC3709255 DOI: 10.1021/mp9001602] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
Amphotericin B (AmB), a well-known polyene antifungal agent, displays a marked tendency to self-associate and, as a consequence, exhibits very poor solubility in water. The therapeutic index of AmB is low and is associated with significant dose-related nephrotoxicity, as well as acute, infusion-related febrile reactions. Reports in the literature indicate that the toxicity of AmB may be related to the physical state of the drug. Reaction of AmB in dimethylformamide with bis(dimethylaminopropyl)carbodiimide yielded an unexpected N-alkylguanidine/N-acylurea bis-adduct of AmB which was highly water-soluble. The absorption spectrum of the AmB derivative in water indicated excellent monomerization, and the antifungal activities of reference AmB and its water-soluble derivative against Candida albicans were found to be virtually identical. Furthermore, the water-soluble adduct is significantly less active in engaging TLR4, which would suggest that the adduct may be less proinflammatory.
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Affiliation(s)
| | | | - Diptesh Sil
- Department of Medicinal Chemistry, University of Kansas
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33
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Takács E, Berente Z, Háda V, Mahó S, Kollár L, Skoda-Földes R. Synthesis of new steroidal derivatives by the reaction of steroid–amino acid conjugates with N,N′-dicyclohexyl-carbodiimide. Unusual formation of steroidal imide derivatives. Tetrahedron 2009. [DOI: 10.1016/j.tet.2009.04.036] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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34
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Hooley RJ, Rebek J. Chemistry and catalysis in functional cavitands. ACTA ACUST UNITED AC 2009; 16:255-64. [PMID: 19318207 DOI: 10.1016/j.chembiol.2008.09.015] [Citation(s) in RCA: 158] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2008] [Revised: 09/04/2008] [Accepted: 09/17/2008] [Indexed: 11/17/2022]
Abstract
Biological macromolecules use binding forces to access unfavorable chemical equilibria and stabilize reactive intermediates by temporarily isolating them from the surrounding medium. Certain synthetic receptors, functional cavitands, share these abilities and allow for the direct observation of labile intermediates by conventional spectroscopy. The cavitands feature inwardly directed functional groups that form reversible, covalent bonds with small molecules held inside. Tetrahedral intermediates of carbonyl addition reactions--hemiaminals, hemiacetals, and hemiketals--show amplified concentrations and lifetimes of minutes under ambient conditions. Labile intermediates in addition reactions of carboxylic acids to isonitriles are also stabilized by isolation in the space of the cavitands. The restricted environments channel the reactions of intermediates in cavitands along a specific path and strengthen the parallels between functional synthetic cavitands and enzymes.
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Affiliation(s)
- Richard J Hooley
- The Skaggs Institute for Chemical Biology and the Department of Chemistry, The Scripps Research Institute, MB-26, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA
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35
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Robert-Peillard F, Palacio-Barco E, Dudal Y, Coulomb B, Boudenne JL. Alternative Spectrofluorimetric Determination of Short-Chain Volatile Fatty Acids in Aqueous Samples. Anal Chem 2009; 81:3063-70. [DOI: 10.1021/ac802768u] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Fabien Robert-Peillard
- Laboratoire Chimie Provence-UMR 6264, Université d’Aix-Marseille I, II, III-CNRS, 3 Place Victor Hugo, Case 29, 13331 Marseille Cedex 3, France, and INRA-SupAgro, Laboratoire Biogéochimie du Sol et de la Rhizosphère-UMR1222, 2 Place Viala, Bâtiment 12, 34080 Montpellier Cedex 2, France
| | - Edwin Palacio-Barco
- Laboratoire Chimie Provence-UMR 6264, Université d’Aix-Marseille I, II, III-CNRS, 3 Place Victor Hugo, Case 29, 13331 Marseille Cedex 3, France, and INRA-SupAgro, Laboratoire Biogéochimie du Sol et de la Rhizosphère-UMR1222, 2 Place Viala, Bâtiment 12, 34080 Montpellier Cedex 2, France
| | - Yves Dudal
- Laboratoire Chimie Provence-UMR 6264, Université d’Aix-Marseille I, II, III-CNRS, 3 Place Victor Hugo, Case 29, 13331 Marseille Cedex 3, France, and INRA-SupAgro, Laboratoire Biogéochimie du Sol et de la Rhizosphère-UMR1222, 2 Place Viala, Bâtiment 12, 34080 Montpellier Cedex 2, France
| | - Bruno Coulomb
- Laboratoire Chimie Provence-UMR 6264, Université d’Aix-Marseille I, II, III-CNRS, 3 Place Victor Hugo, Case 29, 13331 Marseille Cedex 3, France, and INRA-SupAgro, Laboratoire Biogéochimie du Sol et de la Rhizosphère-UMR1222, 2 Place Viala, Bâtiment 12, 34080 Montpellier Cedex 2, France
| | - Jean-Luc Boudenne
- Laboratoire Chimie Provence-UMR 6264, Université d’Aix-Marseille I, II, III-CNRS, 3 Place Victor Hugo, Case 29, 13331 Marseille Cedex 3, France, and INRA-SupAgro, Laboratoire Biogéochimie du Sol et de la Rhizosphère-UMR1222, 2 Place Viala, Bâtiment 12, 34080 Montpellier Cedex 2, France
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36
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Restorp P, Rebek J. Reaction of isonitriles with carboxylic acids in a cavitand: observation of elusive isoimide intermediates. J Am Chem Soc 2008; 130:11850-1. [PMID: 18698780 PMCID: PMC2642476 DOI: 10.1021/ja803854r] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A deep cavitand with an inwardly directed carboxylic acid function reacts with small aliphatic isonitriles to form N-acyl formamides inside the cavity. The unique isolation and stabilization of covalently bound guests within the structured environment of the cavitand allows for observation of the labile O-acyl isoimide intermediate using conventional spectroscopic methods.
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Affiliation(s)
- Per Restorp
- The Skaggs Institute for Chemical Biology, 10550 North Torrey Pines Road, La Jolla, California, 92037, USA
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37
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Abstract
Water stabilized, deep cavitands with three walls and an open side are shown to be receptors for amines and ammonium cations bearing bulky aliphatic groups. The missing wall allows the binding of guests not accommodated by the four-walled counterparts.
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Affiliation(s)
- Agustí Lledó
- The Skaggs Institute for Chemical Biology, 10550 North Torrey Pines Road, La Jolla, California 92037, USA
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38
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Purse BW, Butterfield SM, Ballester P, Shivanyuk A, Rebek J. Interaction energies and dynamics of acid-base pairs isolated in cavitands. J Org Chem 2008; 73:6480-8. [PMID: 18672933 DOI: 10.1021/jo8008534] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The use of capsules and cavitands in physical organic chemistry is briefly reviewed, and their application to the study of salt bridges is introduced. Carboxylate/ammonium ion pairs are generated within an environment that more or less surrounds the functional groups within a synthetic fixed introverted solvent sphere. This is provided by cavitands that fold around amines and present them with a carboxylic acid function. Both organic and water-soluble versions were prepared, and their equilibrium affinities with quinuclidine bases were determined by NMR methods. The association constants range from approximately 10(3) M(-1) in water to more than 10(5) M(-1) in organic solvents. Studies of nitrogen inversion and tumbling of [2.2.2]-diazabicyclooctane within the introverted acids also illustrate the strength of the acid-base interactions. The barriers to in-out exchange of several amine guests were determined to be in the range from 15 to 24 kcal mol(-1). Some parallels with enzymes are drawn: the receptor folds around the guest species; presents them with inwardly directed functionality; and provides a generally hydrophobic environment and a periphery of secondary amide bonds.
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Affiliation(s)
- Byron W Purse
- The Skaggs Institute for Chemical Biology and Department of Chemistry, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, USA
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39
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Iwasawa T, Nishimoto Y, Hama K, Kamei T, Nishiuchi M, Kawamura Y. Synthesis of the functionalized cavitands with inwardly directed dialkylsilyl groups and phosphorous lone pairs. Tetrahedron Lett 2008. [DOI: 10.1016/j.tetlet.2008.05.103] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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40
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Hooley RJ, Iwasawa T, Rebek J. Detection of reactive tetrahedral intermediates in a deep cavitand with an introverted functionality. J Am Chem Soc 2007; 129:15330-9. [PMID: 18004856 DOI: 10.1021/ja0759343] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Labile hemiaminal intermediates are stabilized by binding in a deep cavitand with an introverted aldehyde functionality. The aldehyde is attached to the cavitand via an anthracene spacer that rotates rapidly about the cavitand rim. The half-lives of these hemiaminals vary from 30 min to over 100 h at ambient temperature, due to hydrogen bonding with the organized peptide-like framework at the cavitand rim. The intermediates are sufficiently long-lived to allow study by 2D NMR techniques requiring many hours of acquisition time. Mechanistic analysis of the dehydration step shows first-order kinetics. The analogous "extroverted" reaction was also performed, where the addition took place outside the cavitand, displaying standard steady-state kinetics; no hemiaminal was observed. The cavitand shows strong selectivity based not on binding affinity but upon the rate of the product-forming step. A 10:1 ratio of product imines was obtained, while the initial binding ratio was 1:1. The cavitand acts as a mimic of enzymes in that it uses weak binding forces to stabilize reactive intermediates and isolates them from the medium. The synthetic environment allows direct detection and analysis of the intermediates, as opposed to natural systems that must be analyzed indirectly.
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Affiliation(s)
- Richard J Hooley
- The Skaggs Institute for Chemical Biology and Department of Chemistry, The Scripps Research Institute, MB-26, 10550 North Torrey Pines Road, La Jolla, California 92037, USA
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