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Qiu L, Saha M, Kraft S, Dziekonski ET, Welch CJ, Dai Y, Kaerner A, Cooks RG. Quantitative Determination of Water in Organic Liquids by Ambient Mass Spectrometry. Angew Chem Int Ed Engl 2023; 62:e202310884. [PMID: 37740943 DOI: 10.1002/anie.202310884] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2023] [Revised: 08/31/2023] [Accepted: 09/18/2023] [Indexed: 09/25/2023]
Abstract
This study uses a rapid tandem mass-spectrometry method to determine water content in complex organic solutions. Emphasis is placed on trace-water analysis by a fast and accurate alternative to the Karl-Fischer method. In this new method, water is captured by a charge-labeled molecular probe. Water binds strongly with high specificity to the strongly electrophilic aldehyde site in a charge-labelled molecule (N-methylpyridinium); competitive binding by other analytes is effectively discriminated against in the mass-measurement step. Quantitative determinations are made over a wide concentration range, 0.001 % (10 ppm) to 99 %, with better than 10 % relative standard deviation, along with short (1 min) analysis times using small sample volumes (several μL). Applications include water measurement in simple organic solvents, for example, deuterated solvents, as well as in complex mixtures, for example, organic reaction mixtures. Additionally, this method allows for water monitoring in levitated droplets. Mechanistic investigations into the impact of water on important chemical processes in organic synthesis and environmental science are reported.
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Affiliation(s)
- Lingqi Qiu
- Department of Chemistry, Purdue University, West Lafayette, IN 47907, USA
| | - Mousumi Saha
- Department of Chemistry, Purdue University, West Lafayette, IN 47907, USA
| | | | - Eric T Dziekonski
- Department of Chemistry, Purdue University, West Lafayette, IN 47907, USA
| | - Christopher J Welch
- Indiana Consortium for Analytical Science & Engineering (ICASE), Indianapolis, IN 46202, USA
| | - Yumin Dai
- Department of Analytical Development, Takeda Development Center Americas, Inc., Cambridge, MA 02139, USA
| | | | - R Graham Cooks
- Department of Chemistry, Purdue University, West Lafayette, IN 47907, USA
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Álvarez-Miguel L, Álvarez-Miguel I, Martín-Álvarez JM, Álvarez CM, Rogez G, García-Rodríguez R, Miguel D. Copper complexes for the promotion of iminopyridine ligands derived from β-alanine and self-aldol additions: relaxivity and cytotoxic properties. Dalton Trans 2019; 48:17544-17555. [PMID: 31748774 DOI: 10.1039/c9dt03822a] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
In the study presented herein, we explore the ability of copper complexes with coordinated pyridine-2-carboxaldehyde (pyca) or 2-acetylpyridine (acepy) ligands to promote the addition of amines (Schiff condensation) and other nucleophiles such as alcohols (hemiacetal formation). Distinct reactivity patterns are observed: unlike pyca complexes, acepy copper complexes can promote self-aldol addition. The introduction of a flexible chain via Schiff condensation with β-alanine allows the possibility of chelate ring ring-opening processes mediated by pH. Further derivatization of the complex [CuCl(py-2-C(H)[double bond, length as m-dash]NCH2CH2COO)] is possible by replacing its chloride ligand with different pseudohalogens (N3-, NCO- and NCS-). In addition to the change in their magnetism, which correlates with their solid-state structures, more unexpected effects in their cytotoxicity and relaxitivities are observed, which determines their possibility to be used as MRI contrast agents. The replacement of a chloride by another pseudohalogen, although a simple strategy, can be used to critically change the cytotoxicity of the Schiff base copper(ii) complex and its selectivity towards specific cell lines.
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Affiliation(s)
- Lucía Álvarez-Miguel
- GIR MIOMET-IU CINQUIMA/Química Inorgánica, Facultad de Ciencias, Universidad de Valladolid, Paseo de Belen 7, E-47011 Valladolid, Spain.
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Reznichenko O, Quillévéré A, Martins RP, Loaëc N, Kang H, Lista MJ, Beauvineau C, González-García J, Guillot R, Voisset C, Daskalogianni C, Fåhraeus R, Teulade-Fichou MP, Blondel M, Granzhan A. Novel cationic bis(acylhydrazones) as modulators of Epstein-Barr virus immune evasion acting through disruption of interaction between nucleolin and G-quadruplexes of EBNA1 mRNA. Eur J Med Chem 2019; 178:13-29. [PMID: 31173968 DOI: 10.1016/j.ejmech.2019.05.042] [Citation(s) in RCA: 31] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2019] [Revised: 04/25/2019] [Accepted: 05/15/2019] [Indexed: 12/18/2022]
Abstract
The oncogenic Epstein-Barr virus (EBV) evades the immune system through limiting the expression of its highly antigenic and essential genome maintenance protein, EBNA1, to the minimal level to ensure viral genome replication, thereby also minimizing the production of EBNA1-derived antigenic peptides. This regulation is based on inhibition of translation of the virally-encoded EBNA1 mRNA, and involves the interaction of host protein nucleolin (NCL) with G-quadruplex (G4) structures that form in the glycine-alanine repeat (GAr)-encoding sequence of the EBNA1 mRNA. Ligands that bind to these G4-RNA can prevent their interaction with NCL, leading to disinhibition of EBNA1 expression and antigen presentation, thereby interfering with the immune evasion of EBNA1 and therefore of EBV (M.J. Lista et al., Nature Commun., 2017, 8, 16043). In this work, we synthesized and studied a series of 20 cationic bis(acylhydrazone) derivatives designed as G4 ligands. The in vitro evaluation showed that most derivatives based on central pyridine (Py), naphthyridine (Naph) or phenanthroline (Phen) units were efficient G4 binders, in contrast to their pyrimidine (Pym) counterparts, which were poor G4 binders due to a significantly different molecular geometry. The influence of lateral heterocyclic units (N-substituted pyridinium or quinolinium residues) on G4-binding properties was also investigated. Two novel compounds, namely PyDH2 and PhenDH2, used at a 5 μM concentration, were able to significantly enhance EBNA1 expression in H1299 cells in a GAr-dependent manner, while being significantly less toxic than the prototype drug PhenDC3 (GI50 > 50 μM). Antigen presentation, RNA pull-down and proximity ligation assays confirmed that the effect of both drugs was related to the disruption of NCL-EBNA1 mRNA interaction and the subsequent promotion of GAr-restricted antigen presentation. Our work provides a novel modular scaffold for the development of G-quadruplex-targeting drugs acting through interference with G4-protein interaction.
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Affiliation(s)
- Oksana Reznichenko
- CNRS UMR9187, INSERM U1196, Institut Curie, PSL Research University, 91405, Orsay, France; CNRS UMR9187, INSERM U1196, Université Paris Sud, Université Paris-Saclay, 91405, Orsay, France
| | - Alicia Quillévéré
- INSERM UMR1078, Université de Bretagne Occidentale (UBO), Établissement Français du Sang (EFS) Bretagne, CHRU Brest, 29200, Brest, France
| | - Rodrigo Prado Martins
- INSERM UMR1131, Institut de Génétique Moléculaire (IGM), Université Paris 7, Hôpital St. Louis, 75010, Paris, France
| | - Nadège Loaëc
- INSERM UMR1078, Université de Bretagne Occidentale (UBO), Établissement Français du Sang (EFS) Bretagne, CHRU Brest, 29200, Brest, France
| | - Hang Kang
- CNRS UMR9187, INSERM U1196, Institut Curie, PSL Research University, 91405, Orsay, France; CNRS UMR9187, INSERM U1196, Université Paris Sud, Université Paris-Saclay, 91405, Orsay, France
| | - María José Lista
- INSERM UMR1078, Université de Bretagne Occidentale (UBO), Établissement Français du Sang (EFS) Bretagne, CHRU Brest, 29200, Brest, France
| | - Claire Beauvineau
- CNRS UMR9187, INSERM U1196, Institut Curie, PSL Research University, 91405, Orsay, France; CNRS UMR9187, INSERM U1196, Université Paris Sud, Université Paris-Saclay, 91405, Orsay, France
| | - Jorge González-García
- CNRS UMR9187, INSERM U1196, Institut Curie, PSL Research University, 91405, Orsay, France; CNRS UMR9187, INSERM U1196, Université Paris Sud, Université Paris-Saclay, 91405, Orsay, France
| | - Régis Guillot
- CNRS UMR8182, Institut de Chimie Moléculaire et des Matériaux d'Orsay (ICMMO), Université Paris Sud, Université Paris-Saclay, 91405, Orsay, France
| | - Cécile Voisset
- INSERM UMR1078, Université de Bretagne Occidentale (UBO), Établissement Français du Sang (EFS) Bretagne, CHRU Brest, 29200, Brest, France
| | - Chrysoula Daskalogianni
- INSERM UMR1131, Institut de Génétique Moléculaire (IGM), Université Paris 7, Hôpital St. Louis, 75010, Paris, France
| | - Robin Fåhraeus
- INSERM UMR1131, Institut de Génétique Moléculaire (IGM), Université Paris 7, Hôpital St. Louis, 75010, Paris, France
| | - Marie-Paule Teulade-Fichou
- CNRS UMR9187, INSERM U1196, Institut Curie, PSL Research University, 91405, Orsay, France; CNRS UMR9187, INSERM U1196, Université Paris Sud, Université Paris-Saclay, 91405, Orsay, France.
| | - Marc Blondel
- INSERM UMR1078, Université de Bretagne Occidentale (UBO), Établissement Français du Sang (EFS) Bretagne, CHRU Brest, 29200, Brest, France.
| | - Anton Granzhan
- CNRS UMR9187, INSERM U1196, Institut Curie, PSL Research University, 91405, Orsay, France; CNRS UMR9187, INSERM U1196, Université Paris Sud, Université Paris-Saclay, 91405, Orsay, France.
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