201
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Suggs K, Msezane AZ. Doubly-Charged Negative Ions as Novel Tunable Catalysts: Graphene and Fullerene Molecules Versus Atomic Metals. Int J Mol Sci 2020; 21:E6714. [PMID: 32933219 PMCID: PMC7554846 DOI: 10.3390/ijms21186714] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2020] [Revised: 09/02/2020] [Accepted: 09/11/2020] [Indexed: 12/29/2022] Open
Abstract
The fundamental mechanism underlying negative-ion catalysis involves bond-strength breaking in the transition state (TS). Doubly-charged atomic/molecular anions are proposed as novel dynamic tunable catalysts, as demonstrated in water oxidation into peroxide. Density Functional Theory TS calculations have found a tunable energy activation barrier reduction ranging from 0.030 eV to 2.070 eV, with Si2-, Pu2-, Pa2- and Sn2- being the best catalysts; the radioactive elements usher in new application opportunities. C602- significantly reduces the standard C60- TS energy barrier, while graphene increases it, behaving like cationic systems. According to their reaction barrier reduction efficiency, variation across charge states and systems, rank-ordered catalysts reveal their tunable and wide applications, ranging from water purification to biocompatible antiviral and antibacterial sanitation systems.
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Affiliation(s)
| | - Alfred Z. Msezane
- Department of Physics and CTSPS, Clark Atlanta University, Atlanta, GA 30314, USA;
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202
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Olson LJ, Misra SK, Ishihara M, Battaile KP, Grant OC, Sood A, Woods RJ, Kim JJP, Tiemeyer M, Ren G, Sharp JS, Dahms NM. Allosteric regulation of lysosomal enzyme recognition by the cation-independent mannose 6-phosphate receptor. Commun Biol 2020; 3:498. [PMID: 32908216 PMCID: PMC7481795 DOI: 10.1038/s42003-020-01211-w] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2020] [Accepted: 08/11/2020] [Indexed: 01/09/2023] Open
Abstract
The cation-independent mannose 6-phosphate receptor (CI-MPR, IGF2 receptor or CD222), is a multifunctional glycoprotein required for normal development. Through the receptor's ability to bind unrelated extracellular and intracellular ligands, it participates in numerous functions including protein trafficking, lysosomal biogenesis, and regulation of cell growth. Clinically, endogenous CI-MPR delivers infused recombinant enzymes to lysosomes in the treatment of lysosomal storage diseases. Although four of the 15 domains comprising CI-MPR's extracellular region bind phosphorylated glycans on lysosomal enzymes, knowledge of how CI-MPR interacts with ~60 different lysosomal enzymes is limited. Here, we show by electron microscopy and hydroxyl radical protein footprinting that the N-terminal region of CI-MPR undergoes dynamic conformational changes as a consequence of ligand binding and different pH conditions. These data, coupled with X-ray crystallography, surface plasmon resonance and molecular modeling, allow us to propose a model explaining how high-affinity carbohydrate binding is achieved through allosteric domain cooperativity.
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Affiliation(s)
- Linda J Olson
- Department of Biochemistry, Medical College of Wisconsin, Milwaukee, WI, 53226, USA.
| | - Sandeep K Misra
- Department of BioMolecular Sciences, University of Mississippi, Oxford, MS, 38677, USA
| | - Mayumi Ishihara
- Complex Carbohydrate Research Center, University of Georgia, Athens, GA, 30602, USA
| | - Kevin P Battaile
- IMCA-CAT, Hauptman-Woodward Medical Research Institute, Argonne, IL, USA
- New York Structural Biology Center, New York City, NY, 10027, USA
| | - Oliver C Grant
- Complex Carbohydrate Research Center, University of Georgia, Athens, GA, 30602, USA
| | - Amika Sood
- Complex Carbohydrate Research Center, University of Georgia, Athens, GA, 30602, USA
| | - Robert J Woods
- Complex Carbohydrate Research Center, University of Georgia, Athens, GA, 30602, USA
| | - Jung-Ja P Kim
- Department of Biochemistry, Medical College of Wisconsin, Milwaukee, WI, 53226, USA
| | - Michael Tiemeyer
- Complex Carbohydrate Research Center, University of Georgia, Athens, GA, 30602, USA
| | - Gang Ren
- The Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA
| | - Joshua S Sharp
- Department of BioMolecular Sciences, University of Mississippi, Oxford, MS, 38677, USA
| | - Nancy M Dahms
- Department of Biochemistry, Medical College of Wisconsin, Milwaukee, WI, 53226, USA.
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203
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Abstract
Ions are ubiquitous in nature. They play a key role for many biological processes on the molecular scale, from molecular interactions, to mechanical properties, to folding, to self-organisation and assembly, to reaction equilibria, to signalling, to energy and material transport, to recognition etc. Going beyond monovalent ions to multivalent ions, the effects of the ions are frequently not only stronger (due to the obviously higher charge), but qualitatively different. A typical example is the process of binding of multivalent ions, such as Ca2+ , to a macromolecule and the consequences of this ion binding such as compaction, collapse, potential charge inversion and precipitation of the macromolecule. Here we review these effects and phenomena induced by multivalent ions for biological (macro)molecules, from the "atomistic/molecular" local picture of (potentially specific) interactions to the more global picture of phase behaviour including, e. g., crystallisation, phase separation, oligomerisation etc. Rather than attempting an encyclopedic list of systems, we rather aim for an embracing discussion using typical case studies. We try to cover predominantly three main classes: proteins, nucleic acids, and amphiphilic molecules including interface effects. We do not cover in detail, but make some comparisons to, ion channels, colloidal systems, and synthetic polymers. While there are obvious differences in the behaviour of, and the relevance of multivalent ions for, the three main classes of systems, we also point out analogies. Our attempt of a comprehensive discussion is guided by the idea that there are not only important differences and specific phenomena with regard to the effects of multivalent ions on the main systems, but also important similarities. We hope to bridge physico-chemical mechanisms, concepts of soft matter, and biological observations and connect the different communities further.
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Affiliation(s)
| | - Felix Roosen‐Runge
- Department of Biomedical Sciences and Biofilms-Research Center for Biointerfaces (BRCB), Faculty of Health and SocietyMalmö UniversitySweden
- Division of Physical ChemistryLund UniversitySweden
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204
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Huang L, Zhang W, Yan D, Ma L, Ma H. Solubility and aggregation of soy protein isolate induced by different ionic liquids with the assistance of ultrasound. Int J Biol Macromol 2020; 164:2277-2283. [PMID: 32795570 DOI: 10.1016/j.ijbiomac.2020.08.031] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2020] [Revised: 07/19/2020] [Accepted: 08/04/2020] [Indexed: 01/03/2023]
Abstract
The aim of this study was to evaluate the effects of ionic liquids (ILs) and ultrasound on the solubility and aggregation behavior of soy protein isolate (SPI). A variety of ILs were tested. Results showed that changes in cation or anion altered the physicochemical properties of ionic liquids, which in turn influenced the solubility of SPI. High concentration of ILs resulted in the formation of insoluble aggregates, which lead to the decrease of solubility. In most of the cases, ultrasound pretreatment had a considerable impact on the solubility and aggregation of SPI. The solubility of SPI processed by combination of 1 mg/mL 1-butyl-2,3-dimethyl imidazolium chloride ([BDMIM]Cl) and ultrasound changed remarkably compared with single ultrasound and single [BDMIM]Cl processing, which was increased by 71.8% compared with that of control (P < .05). Changes in particle size, intrinsic fluorescence spectra and free sulfhydryl (SH) groups indicated that the structure of SPI refolded and reaggregated after the ultrasound and ILs pretreatments. Combined ultrasound and 1 mg/mL [BDMIM]Cl pretreatment showed a synergistic effect on changing the SPI microstructure. In conclusion, ultrasound-assisted ILs could be an effective modification method for the globular proteins.
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Affiliation(s)
- Liurong Huang
- School of Food and Biological Engineering, Jiangsu University, 301 Xuefu Road, Zhenjiang 212013, Jiangsu, China; Institute of Food Physical Processing, Jiangsu University, 301 Xuefu Road, Zhenjiang 212013, Jiangsu, China.
| | - Wenxue Zhang
- School of Food and Biological Engineering, Jiangsu University, 301 Xuefu Road, Zhenjiang 212013, Jiangsu, China
| | - Dongguang Yan
- School of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang 212013, Jiangsu, China
| | - Lixin Ma
- School of Food and Biological Engineering, Jiangsu University, 301 Xuefu Road, Zhenjiang 212013, Jiangsu, China
| | - Haile Ma
- School of Food and Biological Engineering, Jiangsu University, 301 Xuefu Road, Zhenjiang 212013, Jiangsu, China; Institute of Food Physical Processing, Jiangsu University, 301 Xuefu Road, Zhenjiang 212013, Jiangsu, China
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205
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Hua Y, Chen L, Hou C, Liu S, Pei Z, Lu Y. Supramolecular Vesicles Based on Amphiphilic Pillar[n]arenes for Smart Nano-Drug Delivery. Int J Nanomedicine 2020; 15:5873-5899. [PMID: 32848395 PMCID: PMC7429218 DOI: 10.2147/ijn.s255637] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2020] [Accepted: 06/10/2020] [Indexed: 11/23/2022] Open
Abstract
Supramolecular vesicles are the most popular smart nano-drug delivery systems (SDDs) because of their unique cavities, which have high loading carrying capacity and controlled-release action in response to specific stimuli. These vesicles are constructed from amphiphilic molecules via host-guest complexation, typically with targeted stimuli-responsive units, which are particularly important in biotechnology and biomedicine applications. Amphiphilic pillar[n]arenes, which are novel and functional macrocyclic host molecules, have been widely used to construct supramolecular vesicles because of their intrinsic rigid and symmetrical structure, electron-rich cavities and excellent properties. In this review, we first explain the synthesis of three types of amphiphilic pillar[n]arenes: neutral, anionic and cationic pillar[n]arenes. Second, we examine supramolecular vesicles composed of amphiphilic pillar[n]arenes recently used for the construction of SDDs. In addition, we describe the prospects for multifunctional amphiphilic pillar[n]arenes, particularly their potential in novel applications.
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Affiliation(s)
- Yijie Hua
- Analysis Center of College of Science & Technology, Hebei Agricultural University, Huanghua, Hebei061100, People’s Republic of China
| | - Lan Chen
- Analysis Center of College of Science & Technology, Hebei Agricultural University, Huanghua, Hebei061100, People’s Republic of China
| | - Chenxi Hou
- College of Chemistry & Pharmacy, Shaanxi Key Laboratory of Natural Products & Chemical Biology, Northwest A&F University, Yangling, Shaanxi712100, People’s Republic of China
| | - Shengbo Liu
- School of Chemistry, Biology, and Material Engineering, Suzhou University of Science and Technology, Suzhou, Jiangsu215009, People’s Republic of China
| | - Zhichao Pei
- College of Chemistry & Pharmacy, Shaanxi Key Laboratory of Natural Products & Chemical Biology, Northwest A&F University, Yangling, Shaanxi712100, People’s Republic of China
| | - Yuchao Lu
- Analysis Center of College of Science & Technology, Hebei Agricultural University, Huanghua, Hebei061100, People’s Republic of China
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206
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Abstract
Despite the central role of Na+ and K+ in physiological processes, it is still unclear whether they interact or alter the physical properties of simple zwitterionic phospholipid bilayers at physiologically relevant concentrations. Here we report a difference in membrane permeability between Na+ and K+, as measured with electrical impedance spectroscopy and tethered bilayer lipid membranes. We reveal that the differences in membrane permeability originate from distinct ion coordination by carbonyl oxygens at the phospholipid-water interface, altering the propensity for bilayer pore formation. Molecular dynamics simulations showed differences in the coordination of Na+ and K+ at the phospholipid-water interface of zwitterionic phospholipid bilayers. The ability of Na+ to conscript more phospholipids with a greater number of coordinating interactions causes a higher localized energy barrier for pore formation. These results provide evidence that ion-specific interactions at the phospholipid-water interface can modulate the physical properties of zwitterionic phospholipid bilayers.
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Affiliation(s)
- Evelyne Deplazes
- School of Life Sciences, University of Technology Sydney, Ultimo, NSW 2007, Australia
| | | | - Charles G Cranfield
- School of Life Sciences, University of Technology Sydney, Ultimo, NSW 2007, Australia
| | - Alvaro Garcia
- School of Life Sciences, University of Technology Sydney, Ultimo, NSW 2007, Australia
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207
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Sánchez-Arribas N, Martínez-Negro M, Villar EM, Pérez L, Aicart E, Taboada P, Guerrero-Martínez A, Junquera E. Biocompatible Nanovector of siRNA Consisting of Arginine-Based Cationic Lipid for Gene Knockdown in Cancer Cells. ACS Appl Mater Interfaces 2020; 12:34536-34547. [PMID: 32657573 DOI: 10.1021/acsami.0c06273] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Despite the use of small interfering RNAs (siRNAs) as therapeutic agents through the knockdown expression of pathogenic proteins, transportation and delivery of such siRNAs into cells continue to be under investigation. Within nonviral vectors, cationic lipids that include amino acid residues in their structures, and that have already demonstrated their suitability as plasmid DNA nanocarriers, may be also considered as potential siRNA vehicles. A double-chain cationic lipid based on the amino acid arginine mixed with a helper lipid has been the object of this biophysical study. First, ζ-potential measurements and agarose gel electrophoresis experiments confirmed the siRNA compaction, while small-angle X-ray scattering analysis (SAXS) revealed the structural pattern of the lipoplexes. Two bicontinuous cubic phases were found to coexist: the double-gyroid phase (QIIG) and the double-diamond phase (QIID), with Pn3m and Ia3d as crystallographic space groups, respectively; the siRNA is known to be located inside their bicontinuous aqueous channels. Second, in vitro studies in HeLa-green fluorescent protein (GFP) and T731-GFP cell lines (modified for GFP overexpression) showed moderate to high gene knockdown levels (determined by flow cytometry and epifluorescence microscopy) with remarkable cell viabilities (CCK-8 assay). Finally, nano-liquid chromatography/mass spectrometry (nanoLC-MS/MS) was used to identify the nature of the proteins adhered to the surface of the lipoplexes after incubation with human serum, simulating their behavior in biological fluids. The abundant presence of lipoproteins and serum albumin in such protein corona, together with the coexistence of the bicontinuous cubic phases, may be behind the remarkable silencing activity of these lipoplexes. The results reported herein show that the use of amino-acid-based cationic lipids mixed with a suitable helper lipid, which have already provided good results as DNA plasmid nanocarriers in cellular transfection processes, may also be a biocompatible option, and so far little investigated, in gene silencing in vitro strategies.
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Affiliation(s)
- Natalia Sánchez-Arribas
- Departamento de Quı́mica Fı́sica, Facultad de Ciencias Químicas, Universidad Complutense de Madrid, 28040 Madrid, Spain
| | - María Martínez-Negro
- Departamento de Quı́mica Fı́sica, Facultad de Ciencias Químicas, Universidad Complutense de Madrid, 28040 Madrid, Spain
| | - Eva M Villar
- Departamento de Fı́sica de Partı́culas, Facultad de Fı́sicas e Instituto de Investigaciones Sanitarias (IDIS), Universidad de Santiago de Compostela, Campus Vida, E-15782 Santiago de Compostela, Spain
| | - Lourdes Pérez
- Departamento de Tecnologı́a Quı́mica y Tensioactivos, IQAC-CSIC, 08034 Barcelona, Spain
| | - Emilio Aicart
- Departamento de Quı́mica Fı́sica, Facultad de Ciencias Químicas, Universidad Complutense de Madrid, 28040 Madrid, Spain
| | - Pablo Taboada
- Departamento de Fı́sica de Partı́culas, Facultad de Fı́sicas e Instituto de Investigaciones Sanitarias (IDIS), Universidad de Santiago de Compostela, Campus Vida, E-15782 Santiago de Compostela, Spain
| | - Andrés Guerrero-Martínez
- Departamento de Quı́mica Fı́sica, Facultad de Ciencias Químicas, Universidad Complutense de Madrid, 28040 Madrid, Spain
| | - Elena Junquera
- Departamento de Quı́mica Fı́sica, Facultad de Ciencias Químicas, Universidad Complutense de Madrid, 28040 Madrid, Spain
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208
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Mascheroni L, Francia V, Rossotti B, Ranucci E, Ferruti P, Maggioni D, Salvati A. Light-Triggered Trafficking to the Cell Nucleus of a Cationic Polyamidoamine Functionalized with Ruthenium Complexes. ACS Appl Mater Interfaces 2020; 12:34576-34587. [PMID: 32643926 PMCID: PMC7404250 DOI: 10.1021/acsami.0c08033] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Abstract
Strategies for endosomal escape and access to the cell nucleus are highly sought for nanocarriers to deliver their load efficiently following endocytosis. In this work, we have studied the uptake and intracellular trafficking of a polycationic polyamidoamine (PAA) endowed with a luminescent Ru complex, Ru-PhenAN, that shows unique trafficking to the cell nucleus. Live cell imaging confirmed the capacity of this polymer to access the nucleus, excluding artifacts due to cell fixation, and clarified that the mechanism of escape is light-triggered and relies on the presence of the Ru complexes and their capacity to absorb light and act as photosensitizers for singlet oxygen production. These results open up the possibility to use PAA-ruthenium complexes for targeted light-triggered delivery of genetic material or drugs to the cytosol and nucleus.
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Affiliation(s)
- Luca Mascheroni
- Dipartimento di
Chimica, Università degli Studi di
Milano, Via Golgi 19, 20133 Milan, Italy
- Department of Nanomedicine and Drug Targeting, Groningen Research
Institute of Pharmacy, University of Groningen, A. Deusinglaan 1, 9713 AV Groningen, The Netherlands
| | - Valentina Francia
- Department of Nanomedicine and Drug Targeting, Groningen Research
Institute of Pharmacy, University of Groningen, A. Deusinglaan 1, 9713 AV Groningen, The Netherlands
| | - Beatrice Rossotti
- Dipartimento di
Chimica, Università degli Studi di
Milano, Via Golgi 19, 20133 Milan, Italy
- Department of Nanomedicine and Drug Targeting, Groningen Research
Institute of Pharmacy, University of Groningen, A. Deusinglaan 1, 9713 AV Groningen, The Netherlands
| | - Elisabetta Ranucci
- Dipartimento di
Chimica, Università degli Studi di
Milano, Via Golgi 19, 20133 Milan, Italy
| | - Paolo Ferruti
- Dipartimento di
Chimica, Università degli Studi di
Milano, Via Golgi 19, 20133 Milan, Italy
| | - Daniela Maggioni
- Dipartimento di
Chimica, Università degli Studi di
Milano, Via Golgi 19, 20133 Milan, Italy
| | - Anna Salvati
- Department of Nanomedicine and Drug Targeting, Groningen Research
Institute of Pharmacy, University of Groningen, A. Deusinglaan 1, 9713 AV Groningen, The Netherlands
- a.salvati.@rug.nl
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209
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Zhao T, Ma X, Cai H, Ma Z, Liang H. Study on the Adsorption of CuFe 2O 4-Loaded Corncob Biochar for Pb(II). Molecules 2020; 25:E3456. [PMID: 32751355 PMCID: PMC7435881 DOI: 10.3390/molecules25153456] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2020] [Revised: 07/27/2020] [Accepted: 07/27/2020] [Indexed: 11/17/2022] Open
Abstract
A series of the magnetic CuFe2O4-loaded corncob biochar (CuFe2O4@CCBC) materials was obtained by combining the two-step impregnation of the corncob biochar with the pyrolysis of oxalate. CuFe2O4@CCBC and the pristine corncob biochar (CCBC) were characterized using XRD, SEM, VSM, BET, as well as pHZPC measurements. The results revealed that CuFe2O4 had a face-centered cubic crystalline phase and was homogeneously coated on the surface of CCBC. The as-prepared CuFe2O4@CCBC(5%) demonstrated a specific surface area of 74.98 m2·g-1, saturation magnetization of 5.75 emu·g-1 and pHZPC of 7.0. The adsorption dynamics and thermodynamic behavior of Pb(II) on CuFe2O4@CCBC and CCBC were investigated. The findings indicated that the pseudo-second kinetic and Langmuir equations suitably fitted the Pb(II) adsorption by CuFe2O4@CCBC or CCBC. At 30 °C and pH = 5.0, CuFe2O4@CCBC(5%) displayed an excellent performance in terms of the process rate and adsorption capacity towards Pb(II), for which the theoretical rate constant (k2) and maximum adsorption capacity (qm) were 7.68 × 10-3 g·mg-1··min-1 and 132.10 mg·g-1 separately, which were obviously higher than those of CCBC (4.38 × 10-3 g·mg-1·min-1 and 15.66 mg·g-1). The thermodynamic analyses exhibited that the adsorption reaction of the materials was endothermic and entropy-driven. The XPS and FTIR results revealed that the removal mechanism could be mainly attributed to the replacement of Pb2+ for H+ in Fe/Cu-OH and -COOH to form the inner surface complexes. Overall, the magnetic CuFe2O4-loaded biochar presents a high potential for use as an eco-friendly adsorbent to eliminate the heavy metals from the wastewater streams.
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Affiliation(s)
- Tianci Zhao
- College of Chemistry and Material Science, Hebei Normal University, Shijiazhuang 050024, China; (T.Z.); (H.C.)
| | - Xiaolong Ma
- School of Environmental Science and Engineering, Hebei University of Science and Technology, Shijiazhuang 050018, China;
| | - Hao Cai
- College of Chemistry and Material Science, Hebei Normal University, Shijiazhuang 050024, China; (T.Z.); (H.C.)
| | - Zichuan Ma
- College of Chemistry and Material Science, Hebei Normal University, Shijiazhuang 050024, China; (T.Z.); (H.C.)
| | - Huifeng Liang
- College of Chemistry and Chemical Engineering, Xingtai University, Xingtai 054001, China
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210
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Xu X, Woźniczka M, Van Hecke K, Buyst D, Mara D, Vervaet C, Herman K, Wynendaele E, Deconinck E, De Spiegeleer B. Structural study of L-ascorbic acid 2-phosphate magnesium, a raw material in cell and tissue therapy. J Biol Inorg Chem 2020; 25:875-885. [PMID: 32719971 DOI: 10.1007/s00775-020-01801-3] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2019] [Accepted: 06/29/2020] [Indexed: 02/02/2023]
Abstract
L-ascorbic acid 2-phosphate magnesium (APMg) salt is a vitamin C derivative frequently used as a raw material in cell and tissue therapy. APMg is not only used as a replacement of the unstable ascorbate, but also shows additional cell-biological functionalities. However, its unknown structural characteristics hamper the mechanistic elucidation of its biological role. Therefore, different techniques were applied for APMg structure characterization. Firstly, the stoichiometric composition was characterized by its solvent, ligand and magnesium content. No crystals of APMg could be obtained; however, a single crystal of APNa, the sodium salt of l-ascorbic acid 2-phosphate, was successfully obtained and its crystal structure was elucidated. FT-IR was applied to further clarify the structure of solid APMg. Finally, the structure of APMg in aqueous solution was explored by potentiometric titration as well as FT-IR.
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Affiliation(s)
- Xiaolong Xu
- Drug Quality and Registration (DruQuaR) Group, Faculty of Pharmaceutical Sciences, Ghent University, Ottergemsesteenweg 460, 9000, Ghent, Belgium
| | - Magdalena Woźniczka
- Department of Physical and Biocoordination Chemistry, Faculty of Pharmacy, Medical University of Łódź, Muszyńskiego 1, 90-151, Łódź, Poland
| | - Kristof Van Hecke
- Department of Chemistry, Ghent University, Krijgslaan 281, 9000, Ghent, Belgium
| | - Dieter Buyst
- Department of Organic and Macromolecular Chemistry, Ghent University, Krijgslaan 281, 9000, Ghent, Belgium
| | - Dimitrije Mara
- Department of Chemistry, Ghent University, Krijgslaan 281, 9000, Ghent, Belgium
| | - Chris Vervaet
- Department of Pharmaceutics, Faculty of Pharmaceutical Sciences, Ghent University, Ottergemsesteenweg 460, 9000, Ghent, Belgium
| | - Karen Herman
- Drug Quality and Registration (DruQuaR) Group, Faculty of Pharmaceutical Sciences, Ghent University, Ottergemsesteenweg 460, 9000, Ghent, Belgium
| | - Evelien Wynendaele
- Drug Quality and Registration (DruQuaR) Group, Faculty of Pharmaceutical Sciences, Ghent University, Ottergemsesteenweg 460, 9000, Ghent, Belgium
| | - Eric Deconinck
- Section of Medicines and Health Products, Scientific Direction Chemical and Physical Health Risks, Sciensano, Juliette Wytsmanstreet 14, 1050, Brussels, Belgium
| | - Bart De Spiegeleer
- Drug Quality and Registration (DruQuaR) Group, Faculty of Pharmaceutical Sciences, Ghent University, Ottergemsesteenweg 460, 9000, Ghent, Belgium.
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211
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Jiang H, Xia Q, Liu D, Ling K. Calcium-cation-doped polydopamine-modified 2D black phosphorus nanosheets as a robust platform for sensitive and specific biomolecule sensing. Anal Chim Acta 2020; 1121:1-10. [PMID: 32493583 DOI: 10.1016/j.aca.2020.04.072] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2019] [Revised: 02/29/2020] [Accepted: 04/28/2020] [Indexed: 02/05/2023]
Abstract
Many polymer decorated/modified 2D nanomaterials have been developed as enhanced drug delivery systems and photothermal theranostic nanoagents. However, few reports describe the use of these novel nanomaterials as nanoplatforms for biomolecule sensing. Herein, we used calcium-cation-doped polydopamine-modified (PDA-modified) 2D black phosphorus (BP) nanosheets (BP@PDA) as a sensing nanoplatform for the detection of nucleic acids and proteins in complex biological samples. Fluorescent-dye-labeled single-strand DNA aptamer/probes are adsorbed by the Ca2+-doped BP@PDA mediated by calcium-cation coordination. The PDA coating enhances the stability of the inner BP, provides binding sites to DNA nucleobases, and quenches fluorescence. Without any chemical conjugation, this sensing nanoplatform selectively and specifically detects protein (human thrombin, linear range: 10-25 nM, detection limit: 0.02 nM), single-strand DNA (linear range: 1-10 nM, detection limit: 0.52 nM) in 1% serum diluted samples, and senses intracellular mRNAs (C-myc, and actin) in living cells. The nanoplatform exhibits the advantages of both the 2D nanomaterial (BP) and the coating polymer (PDA), naturally enters living cells unaided by transfection agents, resists enzymatic lysis and shows high biocompatibility. This nanoplatform design contributes towards future biomolecule analytical method development based on polymer decorated/modified 2D nanomaterials.
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Affiliation(s)
- Hongyan Jiang
- Department of Pharmacy, Shantou University Medical College, No. 22 Xinling Road, Shantou, 515041, China
| | - Qing Xia
- Department of Pharmacy, Shantou University Medical College, No. 22 Xinling Road, Shantou, 515041, China
| | - Daojun Liu
- Department of Pharmacy, Shantou University Medical College, No. 22 Xinling Road, Shantou, 515041, China
| | - Kai Ling
- Department of Pharmacy, Shantou University Medical College, No. 22 Xinling Road, Shantou, 515041, China.
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212
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Majhi D, Komolkin AV, Dvinskikh SV. NMR Spectroscopic Studies of Cation Dynamics in Symmetrically-Substituted Imidazolium-Based Ionic Liquid Crystals. Int J Mol Sci 2020; 21:ijms21145024. [PMID: 32708674 PMCID: PMC7404116 DOI: 10.3390/ijms21145024] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2020] [Revised: 07/11/2020] [Accepted: 07/12/2020] [Indexed: 11/16/2022] Open
Abstract
Ionic liquid crystals (ILCs) present a new class of non-molecular soft materials with a unique combination of high ionic conductivity and anisotropy of physicochemical properties. Symmetrically-substituted long-chain imidazolium-based mesogenic ionic liquids exhibiting a smectic liquid crystalline phase were investigated by solid state NMR spectroscopy and computational methods. The aim of the study was to reveal the correlation between cation size and structure, local dynamics, and orientational order in the layered mesophase. The obtained experimental data are consistent with the model of a rod-shaped cation with the two chains aligned in opposite directions outward from the imidazolium core. The alignment of the core plane to the phase director and the restricted conformations of the chain segments were determined and compared to those in single-chain counterparts. The orientational order parameter S~0.5-0.6 of double-chain ionic liquid crystals is higher than that of corresponding single-chain analogues. This is compatible with the enhanced contribution of van der Waals forces to the stabilization of smectic layers. Increased orientational order for the material with Br- counterions, which exhibit a smaller ionic radius and higher ability to form hydrogen bonds as compared to that of BF4-, also indicated a non-negligible influence of electrostatic and hydrogen bonding interactions. The enhanced rod-shape character and higher orientational order of symmetrically-substituted ILCs can offer additional opportunities in the design of self-assembling non-molecular materials.
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Affiliation(s)
- Debashis Majhi
- Department of Chemistry, KTH Royal Institute of Technology, SE-10044 Stockholm, Sweden;
| | - Andrei V. Komolkin
- Faculty of Physics, Saint Petersburg State University, 199034 Saint Petersburg, Russia;
| | - Sergey V. Dvinskikh
- Department of Chemistry, KTH Royal Institute of Technology, SE-10044 Stockholm, Sweden;
- Laboratory of Biomolecular NMR, Saint Petersburg State University, 199034 Saint Petersburg, Russia
- Correspondence:
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213
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Pajor K, Pajchel Ł, Zgadzaj A, Piotrowska U, Kolmas J. Modifications of Hydroxyapatite by Gallium and Silver Ions-Physicochemical Characterization, Cytotoxicity and Antibacterial Evaluation. Int J Mol Sci 2020; 21:ijms21145006. [PMID: 32679901 PMCID: PMC7404191 DOI: 10.3390/ijms21145006] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2020] [Revised: 07/14/2020] [Accepted: 07/14/2020] [Indexed: 12/11/2022] Open
Abstract
Hydroxyapatite (HA) powders enriched with silver or gallium ions or both were synthesized by two different routes: standard precipitation and the solid-state method. The powders were characterized by using several methods: inductively coupled plasma optical emission spectrometry (ICP-OES), powder X-ray diffractometry (PXRD), transmission electron microscopy (TEM), infrared spectroscopy (FT-IR) and solid-state nuclear magnetic resonance spectroscopy (ssNMR). The effects of enrichment of the HAs in Ag+ or Ga3+ or both on in vitro cytotoxicity and microbiological activity were discussed. PXRD experiments showed that the samples obtained by the wet method consisted of single-phase nanocrystalline HA, while the samples prepared via the solid-state method are microcrystalline with a small amount of calcium oxide. The introduction of higher amounts of silver ions was found to be more effective than enriching HA with small amounts of Ag+. Gallium and silver ions were found not to affect the lattice parameters. Ga3+ affected the crystallinity of the samples as well as the content of structural hydroxyl groups. Among samples synthesized by the wet method, only one (5Ag-HAw) was cytotoxic, whereas all Ga-containing samples obtained by the dry method showed cytotoxicity. In the preliminary antimicrobial test all the materials containing "foreign" ions showed high antibacterial activity.
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Affiliation(s)
- Kamil Pajor
- Department of Analytical Chemistry, Chair of Analytical Chemistry and Biomaterials, Medical University of Warsaw, Faculty of Pharmacy, ul. Banacha 1, 02-097 Warsaw, Poland; (K.P.); (Ł.P.)
| | - Łukasz Pajchel
- Department of Analytical Chemistry, Chair of Analytical Chemistry and Biomaterials, Medical University of Warsaw, Faculty of Pharmacy, ul. Banacha 1, 02-097 Warsaw, Poland; (K.P.); (Ł.P.)
| | - Anna Zgadzaj
- Department of Environmental Health Sciences, Medical University of Warsaw, Faculty of Pharmacy, ul. Banacha 1, 02-097 Warsaw, Poland;
| | - Urszula Piotrowska
- Faculty of Medical Sciences and Health Sciences, Kazimierz Pulaski University of Technology and Humanities in Radom, Chrobrego 27 St., 26-600 Radom, Poland;
| | - Joanna Kolmas
- Department of Analytical Chemistry, Chair of Analytical Chemistry and Biomaterials, Medical University of Warsaw, Faculty of Pharmacy, ul. Banacha 1, 02-097 Warsaw, Poland; (K.P.); (Ł.P.)
- Correspondence:
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214
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Chen B, Dong J, Li B, Xue C, Tetteh PA, Li D, Gao K, Deng X. Using a freshwater green alga Chlorella pyrenoidosa to evaluate the biotoxicity of ionic liquids with different cations and anions. Ecotoxicol Environ Saf 2020; 198:110604. [PMID: 32339924 DOI: 10.1016/j.ecoenv.2020.110604] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/02/2019] [Revised: 04/02/2020] [Accepted: 04/06/2020] [Indexed: 05/28/2023]
Abstract
With the extensive use of ionic liquids (ILs) in various industrial fields, their potential toxicity to aquatic ecosystem has attracted considerable attention. In this work, biotoxicity of ILs with different cations and anions was evaluated by using a freshwater green alga Chlorella pyrenoidosa. Results showed that 1-butyl-3-methylimidazolium chloride ([C4mim]Cl), 1-octyl-3-methylimidazolium chloride ([C8mim]Cl), 1-octyl-3-methylimidazolium nitrate ([C8mim]NO3), 1-octyl-3-methylimidazolium tetrafluoroborate ([C8mim]BF4), and 1-dodecyl-3-methylimidazolium chloride ([C12mim]Cl) had a significant inhibition on the algal growth with EC50 values of 23.48, 4.72, 3.80, 4.44, and 0.10 mg L-1 at the 72 h of exposure, respectively. These data suggested that the toxicity of ILs increased with the increase of side alkyl chain length, while anions had little influences on their toxicity to this alga. Moreover, changes in chlorophyll a content and chlorophyll fluorescence parameters (Fv/Fm and ΦPSII) indicated that the five ILs could damage the photosynthetic system of this alga resulting in the decrease of photosynthetic efficiency. The increased soluble protein content and antioxidase activity could be considered as an active response mechanism of this alga against the exposure of ILs. Content of malondialdehyde (MDA) in this alga increased significantly when it was exposed to ILs, suggesting that reactive oxygen species (ROS) were accumulated in the algal cells, which would cause injury of the algal biofilm and chloroplast. Therefore, results obtained in this work would help to explain the possible underlying toxic mechanisms of ILs to C. pyrenoidosa, and provide a significant theoretical support for assessing the toxicity of ILs to aquatic organisms.
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Affiliation(s)
- Biao Chen
- Jiangsu Key Laboratory of Sericulture Biology and Biotechnology, College of Biotechnology, Jiangsu University of Science and Technology, Zhenjiang, 212003, People's Republic of China
| | - Jingwei Dong
- Jiangsu Key Laboratory of Sericulture Biology and Biotechnology, College of Biotechnology, Jiangsu University of Science and Technology, Zhenjiang, 212003, People's Republic of China
| | - Bin Li
- Jiangsu Key Laboratory of Sericulture Biology and Biotechnology, College of Biotechnology, Jiangsu University of Science and Technology, Zhenjiang, 212003, People's Republic of China
| | - Chunye Xue
- Jiangsu Key Laboratory of Sericulture Biology and Biotechnology, College of Biotechnology, Jiangsu University of Science and Technology, Zhenjiang, 212003, People's Republic of China
| | - Pius Abraham Tetteh
- Jiangsu Key Laboratory of Sericulture Biology and Biotechnology, College of Biotechnology, Jiangsu University of Science and Technology, Zhenjiang, 212003, People's Republic of China
| | - Da Li
- Jiangsu Key Laboratory of Sericulture Biology and Biotechnology, College of Biotechnology, Jiangsu University of Science and Technology, Zhenjiang, 212003, People's Republic of China
| | - Kun Gao
- Jiangsu Key Laboratory of Sericulture Biology and Biotechnology, College of Biotechnology, Jiangsu University of Science and Technology, Zhenjiang, 212003, People's Republic of China
| | - Xiangyuan Deng
- Jiangsu Key Laboratory of Sericulture Biology and Biotechnology, College of Biotechnology, Jiangsu University of Science and Technology, Zhenjiang, 212003, People's Republic of China.
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215
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Abstract
Soil solution chemistry is influenced by atmospheric deposition of air pollutants, exchange processes with the soil matrix and soil-rhizosphere-plant interactions. In this study we present the results of the long-term Intercantonal Forest Observation Program in Switzerland with soil solution measurements since 1998 on a current total of 47 plots. The forest sites comprise two major forest types of Switzerland including a wide range of ecological gradients such as different nitrogen (N) deposition and soil conditions. The long-term data set of 20 years of soil solution measurements revealed an ongoing, but site-specific soil acidification. In strongly acidified soils (soil pH below 4.2), acidification indicators changed only slowly over the measured period, possibly due to high buffering capacity of the aluminum buffer (pH 4.2-3.8). In contrast, in less acidified sites we observed an increasing acidification rate over time, reflected, for example, by the continuous decrease in the ratio of base cations to aluminum (BC/Al ratio). Nowadays, the main driver of soil acidification is the high rate of N deposition, causing cation losses and hampering sustainable nutrient balances for tree nutrition. Mean nitrate leaching rates for the years 2005-2017 were 9.4 kg N ha-1 yr-1, ranging from 0.04 to 53 kg N ha-1 yr-1. Three plots with high N input had a remarkable low nitrate leaching. Both N deposition and nitrate leaching have decreased since 2000. However, the latter trend may be partly explained due to increased drought in recent years. Nonetheless, those high N depositions are still affecting the majority of the forest sites. Taken together, this study gives evidence of anthropogenic soil acidification in Swiss forest stands. The underlying long-term measurements of soil solution provides important information on nutrient leaching losses and the impact climate change effects such as droughts. Furthermore, this study improves the understanding of forest management and tree mortality regarding varying nitrate leaching rates.
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Affiliation(s)
- Sabine Braun
- Institute for Applied Plant Biology, Witterswil, Switzerland
| | - Simon Tresch
- Institute for Applied Plant Biology, Witterswil, Switzerland
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216
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Chen Y, Hu C, Deng D, Li Y, Luo L. Factors affecting sorption behaviors of tetracycline to soils: Importance of soil organic carbon, pH and Cd contamination. Ecotoxicol Environ Saf 2020; 197:110572. [PMID: 32283410 DOI: 10.1016/j.ecoenv.2020.110572] [Citation(s) in RCA: 32] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/24/2020] [Revised: 03/29/2020] [Accepted: 03/31/2020] [Indexed: 05/03/2023]
Abstract
The abuse of tetracycline arises the risk of antibiotic resistance genes and has been paid much attention. To understand the potential bioavailability of tetracycline (TC) in soil environments, this study explored the behaviors of TC adsorbing to six types of soils sampled from different regions of China. Moreover, the solution pH and existence of Cd2+ effect on TC sorption to soils were investigated to understand the influential factors affecting TC sorption. The results showed that the soil properties and sorption capacity of TC varied significantly with different soils. The sorption capacity of TC to soils might be largely affected by cation exchange capacity (CEC) and soil organic carbon (SOC), while the sorption rate, interaction strength and equilibrium sorption binding might be affected by soil pH, pHPZC, soil inorganic carbon (SIC) and H content. The result of solution pH effect suggested that the predominant sorption mechanism for acid soils might be hydrophobic interactions between soils and H2TC0, and the cation exchange was possibly proposed as the primary mechanism for TC sorption to alkaline soils. Furthermore, the presence of Cd2+ might increase TC sorption to acid soil, while reduce TC sorption to alkaline soil. It is expected that this study may provide important information for predicting the potential fate of TC (or similar antibiotics) in different soils, and thus helping to assess the bioavailability of TC in soils.
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Affiliation(s)
- Yuxuan Chen
- College of Environmental Sciences, Sichuan Agricultural University, Chengdu, 611130, PR China
| | - Chunyan Hu
- College of Environmental Sciences, Sichuan Agricultural University, Chengdu, 611130, PR China
| | - Dahang Deng
- College of Environmental Sciences, Sichuan Agricultural University, Chengdu, 611130, PR China
| | - Yigen Li
- College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, 611130, PR China
| | - Ling Luo
- College of Environmental Sciences, Sichuan Agricultural University, Chengdu, 611130, PR China.
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217
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Chao HC, Shih M, McLuckey SA. Generation of Multiply Charged Protein Anions from Multiply Charged Protein Cations via Gas-Phase Ion/Ion Reactions. J Am Soc Mass Spectrom 2020; 31:1509-1517. [PMID: 32421340 PMCID: PMC7332380 DOI: 10.1021/jasms.0c00062] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
We report a novel charge inversion ion/ion reaction that converts multiply charged protein cations to multiply charged protein anions via a single ion/ion collision using highly charged anions derived from nanoelectrospray ionization (nESI) of hyaluronic acids (HAs). This type of charge inversion reaction is demonstrated with cations derived from cytochrome c, apo-myoglobin, and carbonic anhydrase (CA) cations. For example, the reaction has been demonstrated to convert the [CA+22H]22+ carbonic anhydrase cation to a distribution of anions as high in absolute charge as [CA-19H]19-. Ion/ion reactions involving multiply charged ions of opposite polarity have previously been observed to result predominantly in the attachment of the reactant ions. All mechanisms for ion/ion charge inversion involving low energy ions proceed via the formation of a long-lived complex. Factors that underlie the charge inversion of protein cations to high anionic charge states in reaction with HA anions are hypothesized to include: (i) the relatively high charge densities of the HA anions that facilitate the extraction of multiple protons from the protein leading to multiply charged protein anions, (ii) the relatively high sum of absolute charges of the reactants that leads to high initial energies in the ion/ion complex, and (iii) the relatively high charge of the ion/ion complex following the multiple proton transfers that tends to destabilize the complex.
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Affiliation(s)
| | | | - Scott A. McLuckey
- Address correspondence to: Dr. Scott A. McLuckey, 560 Oval Drive, Department of Chemistry, Purdue University, West Lafayette, IN 47907-2084, USA, Phone: (765) 494-5270, Fax: (765) 494-0239,
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218
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Skripov AV, Soloninin AV, Babanova OA, Skoryunov RV. Anion and Cation Dynamics in Polyhydroborate Salts: NMR Studies. Molecules 2020; 25:E2940. [PMID: 32604750 PMCID: PMC7356768 DOI: 10.3390/molecules25122940] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2020] [Revised: 06/22/2020] [Accepted: 06/24/2020] [Indexed: 12/03/2022] Open
Abstract
Polyhydroborate salts represent the important class of energy materials attracting significant recent attention. Some of these salts exhibit promising hydrogen storage properties and/or high ionic conductivities favorable for applications as solid electrolytes in batteries. Two basic types of thermally activated atomic jump motion are known to exist in these materials: the reorientational (rotational) motion of complex anions and the translational diffusion of cations or complex anions. The present paper reviews recent progress in nuclear magnetic resonance (NMR) studies of both reorientational and diffusive jump motion in polyhydroborate salts. The emphasis is put on sodium and lithium closo-borates exhibiting high ionic conductivity and on borohydride-based systems showing extremely fast reorientational motion down to low temperatures. For these systems, we discuss the effects of order-disorder phase transitions on the parameters of reorientations and diffusive jumps, as well as the mechanism of low-temperature rotational tunneling.
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Affiliation(s)
- Alexander V. Skripov
- Institute of Metal Physics, Ural Branch of the Russian Academy of Sciences, S. Kovalevskoi 18, 620108 Ekaterinburg, Russia; (A.V.S.); (O.A.B.); (R.V.S.)
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219
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Cong X, Tian H, Liu S, Mao K, Chen H, Xin Y, Liu F, Wang X, Meng X, Zhu G, Wang J, Gao X, Tan H, Yang YG, Sun T. Cationic Liposome/DNA Complexes Mediate Antitumor Immunotherapy by Promoting Immunogenic Tumor Cell Death and Dendritic Cell Activation. ACS Appl Mater Interfaces 2020; 12:28047-28056. [PMID: 32478501 DOI: 10.1021/acsami.0c08112] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Immunotherapy has been successfully used in the treatment of multiple malignancies, but clinical studies revealed low response rates. Thus, the development of new effective immunotherapeutic modalities is urgently needed. Successfully inducing tumor cell death with enhanced antigenicity is important for the expansion and differentiation of tumor-specific CD8+ cytotoxic T lymphocytes. Cationic liposome/DNA complexes (CLN/DNA), which usually have obvious cytotoxic effects, may improve the antitumor immunity through enhancing the immunogenicity of dying tumor cells. Herein, we report that a plasmid DNA-encapsulated cationic lipid nanoparticle formulated with cholesterol, DOTAP, and DSPE-mPEG2000 significantly increases the tumor cell death with high antigenicity in vitro. Furthermore, the cationic liposome/DNA complex (CLN/DNA) treatment promotes the activation of dendritic cells (DCs). We also find that the intratumorally injected CLN/DNA successfully promoted the activation of DCs in the tumor-draining lymph node. Importantly, both local tumor growth and distant tumor formation were significantly inhibited by T cell-dependent antitumor immune responses after intratumoral injection of CLN/DNA. This study presents a simple and effective strategy for improving the cancer immunotherapy.
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Affiliation(s)
- Xiuxiu Cong
- Key Laboratory of Organ Regeneration and Transplantation of Ministry of Education, The First Hospital, Jilin University, Changchun, Jilin 130061, China
- National-local Joint Engineering Laboratory of Animal Models for Human Diseases, Changchun, Jilin 130062, China
| | - Huimin Tian
- Key Laboratory of Organ Regeneration and Transplantation of Ministry of Education, The First Hospital, Jilin University, Changchun, Jilin 130061, China
- National-local Joint Engineering Laboratory of Animal Models for Human Diseases, Changchun, Jilin 130062, China
| | - Shuhan Liu
- Key Laboratory of Organ Regeneration and Transplantation of Ministry of Education, The First Hospital, Jilin University, Changchun, Jilin 130061, China
- National-local Joint Engineering Laboratory of Animal Models for Human Diseases, Changchun, Jilin 130062, China
| | - Kuirong Mao
- Key Laboratory of Organ Regeneration and Transplantation of Ministry of Education, The First Hospital, Jilin University, Changchun, Jilin 130061, China
- National-local Joint Engineering Laboratory of Animal Models for Human Diseases, Changchun, Jilin 130062, China
- International Center of Future Science at Jilin University, Changchun, Jilin 130015, China
| | - Hongmei Chen
- Key Laboratory of Organ Regeneration and Transplantation of Ministry of Education, The First Hospital, Jilin University, Changchun, Jilin 130061, China
| | - Yanbao Xin
- Key Laboratory of Organ Regeneration and Transplantation of Ministry of Education, The First Hospital, Jilin University, Changchun, Jilin 130061, China
- National-local Joint Engineering Laboratory of Animal Models for Human Diseases, Changchun, Jilin 130062, China
| | - Feiqi Liu
- Key Laboratory of Organ Regeneration and Transplantation of Ministry of Education, The First Hospital, Jilin University, Changchun, Jilin 130061, China
| | - Xin Wang
- Key Laboratory of Organ Regeneration and Transplantation of Ministry of Education, The First Hospital, Jilin University, Changchun, Jilin 130061, China
- National-local Joint Engineering Laboratory of Animal Models for Human Diseases, Changchun, Jilin 130062, China
| | - Xiandi Meng
- Key Laboratory of Organ Regeneration and Transplantation of Ministry of Education, The First Hospital, Jilin University, Changchun, Jilin 130061, China
- National-local Joint Engineering Laboratory of Animal Models for Human Diseases, Changchun, Jilin 130062, China
| | - Ge Zhu
- Key Laboratory of Organ Regeneration and Transplantation of Ministry of Education, The First Hospital, Jilin University, Changchun, Jilin 130061, China
- National-local Joint Engineering Laboratory of Animal Models for Human Diseases, Changchun, Jilin 130062, China
| | - Jialiang Wang
- Key Laboratory of Organ Regeneration and Transplantation of Ministry of Education, The First Hospital, Jilin University, Changchun, Jilin 130061, China
- National-local Joint Engineering Laboratory of Animal Models for Human Diseases, Changchun, Jilin 130062, China
| | - Xue Gao
- Key Laboratory of Organ Regeneration and Transplantation of Ministry of Education, The First Hospital, Jilin University, Changchun, Jilin 130061, China
- National-local Joint Engineering Laboratory of Animal Models for Human Diseases, Changchun, Jilin 130062, China
| | - Huizhu Tan
- Key Laboratory of Organ Regeneration and Transplantation of Ministry of Education, The First Hospital, Jilin University, Changchun, Jilin 130061, China
- National-local Joint Engineering Laboratory of Animal Models for Human Diseases, Changchun, Jilin 130062, China
| | - Yong-Guang Yang
- Key Laboratory of Organ Regeneration and Transplantation of Ministry of Education, The First Hospital, Jilin University, Changchun, Jilin 130061, China
- National-local Joint Engineering Laboratory of Animal Models for Human Diseases, Changchun, Jilin 130062, China
- International Center of Future Science at Jilin University, Changchun, Jilin 130015, China
| | - Tianmeng Sun
- Key Laboratory of Organ Regeneration and Transplantation of Ministry of Education, The First Hospital, Jilin University, Changchun, Jilin 130061, China
- National-local Joint Engineering Laboratory of Animal Models for Human Diseases, Changchun, Jilin 130062, China
- International Center of Future Science at Jilin University, Changchun, Jilin 130015, China
- State Key Laboratory of Supramolecular Structure and Materials, Jilin University, Changchun, Jilin 130012, China
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220
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Pieńkos M, Zadykowicz B. Computational Insights on the Mechanism of the Chemiluminescence Reaction of New Group of Chemiluminogens-10-Methyl-9-thiophenoxycarbonylacridinium Cations. Int J Mol Sci 2020; 21:E4417. [PMID: 32575922 PMCID: PMC7420290 DOI: 10.3390/ijms21124417] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2020] [Revised: 06/19/2020] [Accepted: 06/20/2020] [Indexed: 11/16/2022] Open
Abstract
Immunodiagnostics, in which one of the promising procedures is the chemiluminescent labelling, is essential to facilitate the detection of infections in a human organism. One of the standards commonly used in luminometric assays is luminol, which characterized by low quantum yield in aqueous environments. Acridinium esters have better characteristics in this topic. Therefore, the search for new derivatives, especially those characterized by the higher quantum yield of chemiluminescence, is one of the aims of the research undertaken. Using the proposed mechanism of chemiluminescence, we examined the effect of replacing a single atom within a center of reaction on the efficient transformation of substrates into electronically excited products. The density functional theory (DFT) and time dependent (TD) DFT calculated thermodynamic and kinetic data concerning the chemiluminescence and competitive dark pathways suggests that some of the scrutinized derivatives have better characteristics than the chemiluminogens used so far. Synthesis of these candidates for efficient chemiluminogens, followed by studies of their chemiluminescent properties, and ultimately in chemiluminescent labelling, are further steps to confirm their potential applicability in immunodiagnostics.
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Affiliation(s)
| | - Beata Zadykowicz
- Faculty of Chemistry, University of Gdańsk, Wita Stwosza 63, 80-308 Gdańsk, Poland;
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221
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Farsang E, Horváth K, Beck A, Wang Q, Lauber M, Guillarme D, Fekete S. Impact of the column on effluent pH in cation exchange pH gradient chromatography, a practical study. J Chromatogr A 2020; 1626:461350. [PMID: 32797830 DOI: 10.1016/j.chroma.2020.461350] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2020] [Revised: 06/09/2020] [Accepted: 06/15/2020] [Indexed: 01/16/2023]
Abstract
In ionexchange chromatography, the pH gradient mode becomes more and more popular today for the analysis of therapeutic proteins as this mode can provide higher or alternative selectivity to the commonly used salt gradient mode. Ideally, a linear pH response is expected when performing linear gradients. However up to now, only a very few buffer systems have been developed and are commercially available which can perform nearly linear pH responses when flowing through a given column. It is also known that a selected buffer system (mobile phase) can work well on one column but can fail on other column. The goal of this study was to practically evaluate the effects that ionexchange columns (weak and strong exchangers) might have on effluent pH, when performing linear pH gradient separations of therapeutic monoclonal antibodies. To attain this objective, the pH was monitored on-line at the column outlet using a specific setup. To make comprehensive observations of the phenomenon, four different mobile phase conditions and five cation exchange columns (weak and strong exchangers) were employed. The obtained pH responses were systematically compared to responses measured in the absence of the columns. From this work, it has become clear that both the column and mobile phase can have significant effects on pH gradient chromatography and that their combination must be considered when developing a new method. Phase systems (column + mobile phase) providing linear pH responses are indeed the most suitable for separating mAbs with different isoelectric points and, with them, it is possible to elute mAbs across wide retention time ranges and with high selectivity.
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Affiliation(s)
- Evelin Farsang
- Department of Analytical Chemistry, University of Pannonia, Egyetem u. 10., H-8200 Veszprém, Hungary
| | - Krisztián Horváth
- Department of Analytical Chemistry, University of Pannonia, Egyetem u. 10., H-8200 Veszprém, Hungary
| | - Alain Beck
- Center of Immunology Pierre Fabre, 5 Avenue Napoléon III, BP 60497, 74160 Saint-Julien-en-Genevois, France
| | - Qi Wang
- Waters Corporation, 34 Maple Street, Milford, MA 01757-3696, United States; Current Address: Bristol Myers Squibb, 38 Jackson Rd, Devens, MA 01434, United States
| | - Matthew Lauber
- Waters Corporation, 34 Maple Street, Milford, MA 01757-3696, United States
| | - Davy Guillarme
- Institute of Pharmaceutical Sciences of Western Switzerland, University of Geneva, CMU-Rue Michel Servet 1, 1211 Geneva 4, Switzerland
| | - Szabolcs Fekete
- Institute of Pharmaceutical Sciences of Western Switzerland, University of Geneva, CMU-Rue Michel Servet 1, 1211 Geneva 4, Switzerland.
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222
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Huang SR, Dang A, Tureček F. Ground and Excited States of Gas-Phase DNA Nucleobase Cation-Radicals. A UV-vis Photodisociation Action Spectroscopy and Computational Study of Adenine and 9-Methyladenine. J Am Soc Mass Spectrom 2020; 31:1271-1281. [PMID: 32324398 DOI: 10.1021/jasms.0c00095] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Cation radicals of adenine (A•+) and 9-methyladenine (MA•+) were generated in the gas phase by collision-induced intramolecular electron transfer in copper-terpyridine-nucleobase ternary complexes and characterized by collision-induced dissociation (CID) mass spectra and UV-vis photodissociation action spectroscopy in the 210-700 nm wavelength region. The action spectra of both A•+ and MA•+ displayed characteristic absorption bands in the near-UV and visible regions. Another tautomer of A•+ was generated as a minor product by multistep CID of protonated 9-(2-bromoethyl)adenine. Structure analysis by density functional theory and coupled-clusters ab initio calculations pointed to the canonical 9-H-tautomer Ad1•+ as the global energy minimum of adenine cation radicals. The canonical tautomer MA1•+ was also calculated to be a low-energy structure among methyladenine cation radicals. However, two new noncanonical tautomers were found to be energetically comparable to MA1•+. Vibronic absorption spectra were calculated for several tautomers of A•+ and MA•+ and benchmarked on equation-of-motion coupled-clusters excited-state calculations. Analysis of the vibronic absorption spectra of A•+ tautomers pointed to the canonical tautomer Ad1•+ as providing the best match with the action spectrum. Likewise, the canonical tautomer MA1•+ was the unequivocal best match for the MA•+ ion generated in the gas phase. According to potential-energy mapping, MA1•+ was separated from energetically favorable noncanonical cation radicals by a high-energy barrier that was calculated to be above the dissociation threshold for loss of a methyl hydrogen atom, thus preventing isomerization. Structures and energetics of all four DNA nucleobase cation radicals are compared and discussed.
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Affiliation(s)
- Shu R Huang
- Department of Chemistry, University of Washington, Bagley Hall, Box 351700, Seattle, Washington 98195-1700, United States
| | - Andy Dang
- Department of Chemistry, University of Washington, Bagley Hall, Box 351700, Seattle, Washington 98195-1700, United States
| | - František Tureček
- Department of Chemistry, University of Washington, Bagley Hall, Box 351700, Seattle, Washington 98195-1700, United States
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223
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Ivanić M, Durn G, Škapin SD, Sondi I. Size-related mineralogical and surface physicochemical properties of the mineral particles from the recent sediments of the Eastern Adriatic Sea. Chemosphere 2020; 249:126531. [PMID: 32213392 DOI: 10.1016/j.chemosphere.2020.126531] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/22/2020] [Revised: 03/14/2020] [Accepted: 03/16/2020] [Indexed: 06/10/2023]
Abstract
The mineral composition and surface physico-chemical properties, i.e., specific surface area (SSA), cation exchange capacity (CEC), and surface charge of recent sediments and their submicron mineral fractions from different sedimentological environments of the Eastern Adriatic were investigated. The influence of organic matter on these properties was also investigated. It was shown that illite and mixed-layered clay minerals (MLCM) were ubiquitous and showed no size-related preferences while the occurrence of smectites, chlorites, and kaolinites varied. The smectites content increased and the chlorites decreased slightly with decreasing particle size. The sediments from the carbonate-rich environment contained no smectites or chlorites and had the highest kaolinite content. For the first time, in the recent sediments of the Adriatic Sea the poorly- and the well-crystallised kaolinite (Kl and KlD) were distinguished. While Kl predominates in the submicron-sized fraction, KlD occurred only in micron-sized fractions. Authigenic aragonite of submicron-sized was determined in a distinct environment of the semi-enclosed marine lake. The differences in mineral composition and particle size of sediments and their separated fractions were reflected in a wide range of the SSA and CEC values obtained. The highest values of SSA and CEC were determined in the phyllosilicates-rich submicron-sized fractions range, 109 m2g-1 and 87.4 cmol+kg-1, respectively. The submicron-sized fraction from aragonite-rich marine lake showed the lowest values of SSA (56.4 m2g-1) and CEC (38.8 cmol+kg-1), which are still unexpectedly high for carbonate-rich environments. The removal of organic matter resulted in a significant increase in SSA and CEC, up to 150% and 76%, respectively.
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Affiliation(s)
- Maja Ivanić
- Ruđer Bošković Institute, Division for Marine and Environmental Research, Bijenička 54, 10000, Zagreb, Croatia
| | - Goran Durn
- Faculty of Mining, Geology and Petroleum Engineering, University of Zagreb, Pierottijeva 6, 10000, Zagreb, Croatia
| | - Srečo D Škapin
- Department of Advanced Materials, Jožef Stefan Institute, Jamova cesta 39, 1000, Ljubljana, Slovenia
| | - Ivan Sondi
- Faculty of Mining, Geology and Petroleum Engineering, University of Zagreb, Pierottijeva 6, 10000, Zagreb, Croatia.
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224
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Sasaki Y, Takase M, Mori S, Uno H. Synthesis and Properties of NitroHPHAC: The First Example of Substitution Reaction on HPHAC. Molecules 2020; 25:molecules25112486. [PMID: 32471200 PMCID: PMC7321187 DOI: 10.3390/molecules25112486] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2020] [Revised: 05/23/2020] [Accepted: 05/24/2020] [Indexed: 11/29/2022] Open
Abstract
Hexapyrrolohexaazacoronene (HPHAC) is one of the N-containing polycyclic aromatic hydrocarbons in which six pyrroles are fused circularly around a benzene. Despite the recent development of HPHAC analogues, there is no report on direct introduction of functional groups into the HPHAC skeleton. This work reports the first example of nitration reaction of decaethylHPHAC. The structures of nitrodecaethylHPHAC including neutral and two oxidized species (radical cation and dication), intramolecular charge transfer (ICT) character, and global aromaticity of the dication are discussed.
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Affiliation(s)
| | - Masayoshi Takase
- Correspondence: (M.T.); (H.U.); Tel.: +81-89-927-9612 (M.T.); +81-89-927-9610 (H.U.)
| | | | - Hidemitsu Uno
- Correspondence: (M.T.); (H.U.); Tel.: +81-89-927-9612 (M.T.); +81-89-927-9610 (H.U.)
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225
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Balanikas E, Banyasz A, Baldacchino G, Markovitsi D. Guanine Radicals Generated in Telomeric G-Quadruplexes by Direct Absorption of Low-Energy UV Photons: Effect of Potassium Ions. Molecules 2020; 25:molecules25092094. [PMID: 32365780 PMCID: PMC7248781 DOI: 10.3390/molecules25092094] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2020] [Revised: 04/23/2020] [Accepted: 04/27/2020] [Indexed: 11/16/2022] Open
Abstract
The study deals with the primary species, ejected electrons, and guanine radicals, leading to oxidative damage, that is generated in four-stranded DNA structures (guanine quadruplexes) following photo-ionization by low-energy UV radiation. Performed by nanosecond transient absorption spectroscopy with 266 nm excitation, it focusses on quadruplexes formed by folding of GGG(TTAGGG)3 single strands in the presence of K+ ions, TEL21/K+. The quantum yield for one-photon ionization (9.4 × 10-3) was found to be twice as high as that reported previously for TEL21/Na+. The overall population of guanine radicals decayed faster, their half times being, respectively, 1.4 and 6.7 ms. Deprotonation of radical cations extended over four orders of magnitude of time; the faster step, concerning 40% of their population, was completed within 500 ns. A reaction intermediate, issued from radicals, whose absorption spectrum peaked around 390 nm, was detected.
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Affiliation(s)
- Evangelos Balanikas
- LIDYL, CEA, CNRS, Université Paris-Saclay, F-91191 Gif-sur-Yvette, France; (E.B.); (A.B.); (G.B.)
| | - Akos Banyasz
- LIDYL, CEA, CNRS, Université Paris-Saclay, F-91191 Gif-sur-Yvette, France; (E.B.); (A.B.); (G.B.)
- Univ Lyon, ENS de Lyon, CNRS UMR 5182, Université Claude Bernard Lyon 1, Laboratoire de Chimie, F-69342 Lyon, France
| | - Gérard Baldacchino
- LIDYL, CEA, CNRS, Université Paris-Saclay, F-91191 Gif-sur-Yvette, France; (E.B.); (A.B.); (G.B.)
| | - Dimitra Markovitsi
- LIDYL, CEA, CNRS, Université Paris-Saclay, F-91191 Gif-sur-Yvette, France; (E.B.); (A.B.); (G.B.)
- Correspondence: ; Tel.: +33-169084644
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226
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Sutton JM, Bartlett MG. Modeling cationic adduction of oligonucleotides using electrospray desorption ionization. Rapid Commun Mass Spectrom 2020; 34:e8696. [PMID: 31834644 DOI: 10.1002/rcm.8696] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/10/2019] [Revised: 12/06/2019] [Accepted: 12/07/2019] [Indexed: 06/10/2023]
Abstract
RATIONALE Cationic adduction causes poor sensitivity and increases spectral complexity during mass spectral analysis of oligonucleotides and alkylamines are used to reduce this adduction. It is unclear the effect of the physiochemical properties of the alkylamines on the reduction of the cationic adduction. METHODS All samples were directly infused into a Synapt G2 HDMS quadrupole time-of-flight (TOF) hybrid mass spectrometer in negative ion electrospray ionization mode through the native built-in fluidics system. The infusion flow rate was set to 50 μL/min. The TOFMS tuning parameters were as follows: capillary voltage -2.0 kV, cone voltage 25 V, extraction cone voltage 2 V, source temperature 125°C, desolvation temperature 450°C, cone gas flow rate 0 L/h, and desolvation gas (nitrogen) flow rate 1000 L/h. RESULTS A quantitative model was created to predict the optimized alkylamine for MS analysis, while a qualitative model was generated to explain the most important physiochemical properties: proton affinity (13.83%), gas-phase basicity (11.79%), pKa (11.47%), boiling point (10.73%), MW (10.3%), Henry's Law Constant (9.56%), and partition coefficient (logP) (9.44%). The quantitative model was applied to RNA (microRNA) and a phosphorothioate and predicts the trend of cationic adduction. CONCLUSIONS Two models are described to understand the physiochemical properties that contribute to the adduction and to provide users a quick mathematical tool to predict the best choice of alkylamine to lower cationic adduction and decrease spectral complexity while enhancing sensitivity.
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Affiliation(s)
- J Michael Sutton
- Department of Pharmaceutical and Biomedical Sciences, College of Pharmacy, University of Georgia, 250 West Green Street, Athens, GA, 30602-2352, USA
| | - Michael G Bartlett
- Department of Pharmaceutical and Biomedical Sciences, College of Pharmacy, University of Georgia, 250 West Green Street, Athens, GA, 30602-2352, USA
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227
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Hoseini M, Sharifi S, Sazgarnia A. The Influence of Anionic, Cationic Surfactant and AOT/Water/Heptane Reverse Micelle on Photophysical Properties of Crocin: Compare with RPMI Effect. J Fluoresc 2020; 30:665-677. [PMID: 32338327 DOI: 10.1007/s10895-020-02525-y] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2020] [Accepted: 03/09/2020] [Indexed: 12/27/2022]
Abstract
Encapsulation of crocin (CN), having large nonlinear optical (NLO) properties, can be utilized in studies of photodynamic therapy (PDT). For this purpose, photo-physical and NLO properties of CN encapsulation with and without cell culture medium (CCM) were investigated. As well, nonlinear absorption (NLA) coefficient and nonlinear refractive (NLR) indices were found to be 10-7 (cm W-1) and 10-12 (cm2 W-1); respectively. The results revealed that NLO properties of CN had changed through its dipole moment. Reflecting on the theory of Bilot and Kawski, it was evidenced that the dipole moment of CN could change with a nano-droplet size. Furthermore, it was demonstrated that RPMI-1640 as a growth medium had failed to change NLO properties of CN encapsulated in nano-droplet. Accordingly, the encapsulated CN in nano-droplet in the form of a photosensitizer (PS) was suggested as a good candidate to examine PDT under in-vitro conditions.
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Affiliation(s)
- Mehdi Hoseini
- Department of Medical Physics, School of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran.
- Medical Physics Research Center, Mashhad University of Medical Sciences, Mashhad, Iran.
| | - Soheil Sharifi
- Department of Physics, Faculty of Science, Ferdowsi University of Mashhad, Mashhad, Iran
| | - Ameneh Sazgarnia
- Department of Medical Physics, School of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran
- Medical Physics Research Center, Mashhad University of Medical Sciences, Mashhad, Iran
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228
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Wojciechowski JP, Martin AD, Du EY, Garvey CJ, Nordon RE, Thordarson P. Non-reversible heat-induced gelation of a biocompatible Fmoc-hexapeptide in water. Nanoscale 2020; 12:8262-8267. [PMID: 32236222 DOI: 10.1039/d0nr00289e] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Hydrogel materials which respond to changes in temperature are widely applicable for injectable drug delivery or tissue engineering applications. Here, we report the unsual heat-induced gelation behaviour of a low molecular weight gelator based on an Fmoc-hexapeptide, Fmoc-GFFRGD. We show that Fmoc-GFFRGD forms kinetically stable fibres when mixed with divalent cations (e.g. Ca2+). Gelation of the mixture occurs upon heating of the mixture which enables electrostatic screening by the divalent cations and hydrophobic collapse of the fibres to give a self-supporting hydrogel network that shows good biocompatibility with L929 fibroblast cells. This work highlights a unique mechanism to initiate heat-induced gelation which should find opportunities as a gelation trigger for injectable hydrogels or fundamental self-assembly applications.
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Affiliation(s)
- Jonathan P Wojciechowski
- School of Chemistry, The Australian Centre for Nanomedicine and the ARC Centre for Convergent Bio-Nano Science & Technology, University of New South Wales, Sydney, NSW 2052, Australia.
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229
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Kouli ME, Banis G, Savvidou MG, Ferraro A, Hristoforou E. A Study on Magnetic Removal of Hexavalent Chromium from Aqueous Solutions Using Magnetite/Zeolite-X Composite Particles as Adsorbing Material. Int J Mol Sci 2020; 21:E2707. [PMID: 32295148 PMCID: PMC7215634 DOI: 10.3390/ijms21082707] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2020] [Revised: 04/03/2020] [Accepted: 04/11/2020] [Indexed: 11/17/2022] Open
Abstract
Toxic and heavy metals are considered harmful derivatives of industrial activities; they are not biodegradable and their accumulation in living organisms can become lethal. Among other heavy and toxic metals, chromium is considered hazardous, especially in the hexavalent (Cr6+) form. Numerous established studies show that exposure to Cr6+ via drinking water leads to elevated chromium levels in tissues, which may result in various forms of cancer. The purpose of this research is to synthesize magnetite/zeolite-X composite particles for the adsorption and magnetic removal of Cr6+ ions from aqueous solutions. Synthesis and characterization of such composite nanomaterials, along with an initial experimental evaluation of Cr6+ removal from water-based solution, are presented. Results show that zeolite-X is a very promising zeolite form, that when bound to magnetic nanoparticles can be used to trap and magnetically remove toxic ions from aqueous solutions.
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Affiliation(s)
- Maria-Elisavet Kouli
- Laboratory of Electronic Sensors, School of Electrical and Computer Engineering, NTU of Athens, Iroon Polytechniou 9, 15780 Zografou, Greece; (G.B.); (A.F.); (E.H.)
| | - George Banis
- Laboratory of Electronic Sensors, School of Electrical and Computer Engineering, NTU of Athens, Iroon Polytechniou 9, 15780 Zografou, Greece; (G.B.); (A.F.); (E.H.)
| | - Maria G. Savvidou
- Biotechnology Laboratory, School of Chemical Engineering, NTU of Athens, 9 Iroon Polytechniou Str., Zografou Campus, 15780 Athens, Greece;
| | - Angelo Ferraro
- Laboratory of Electronic Sensors, School of Electrical and Computer Engineering, NTU of Athens, Iroon Polytechniou 9, 15780 Zografou, Greece; (G.B.); (A.F.); (E.H.)
| | - Evangelos Hristoforou
- Laboratory of Electronic Sensors, School of Electrical and Computer Engineering, NTU of Athens, Iroon Polytechniou 9, 15780 Zografou, Greece; (G.B.); (A.F.); (E.H.)
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230
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Zhang M, Zhang Z, Peng Y, Feng L, Li X, Zhao C, Sarfaraz K. Novel cationic polymer modified magnetic chitosan beads for efficient adsorption of heavy metals and dyes over a wide pH range. Int J Biol Macromol 2020; 156:289-301. [PMID: 32289412 DOI: 10.1016/j.ijbiomac.2020.04.020] [Citation(s) in RCA: 50] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2020] [Revised: 03/31/2020] [Accepted: 04/05/2020] [Indexed: 11/19/2022]
Abstract
Wastewater containing highly toxic and non-biodegradable heavy metals and organic dyes poses a serious threat to ecological environment and human health. Adsorption has been regarded as a promising technology to purify this kind of wastewater. Therefore, it is of great importance to develop efficient adsorbents. Herein, a magnetically recyclable adsorbent Fe3O4-CS/PDAC was facilely fabricated by coating poly(acryloyloxyethyltrimethyl ammonium chloride)-modified chitosan on the surface of Fe3O4 nanoparticles. The morphology, physical-chemical and magnetic properties of as-prepared Fe3O4-CS/PDAC was fully characterized by various techniques. Its adsorption behaviors towards heavy metal Cr(VI) and organic dye sunset yellow (SY) were systematically investigated. Evidently, Fe3O4-CS/PDAC exhibited adsorption capacities of 163.93 and 769.23 mg/g for Cr(VI) and SY respectively, much higher than other reported adsorbents. Besides, batch experiment results showed that adsorption capacities decreased slightly with pH increasing from 2.0 to 10.0. Furthermore, Fe3O4-CS/PDAC could be easily separated and effectively regenerated after adsorption. The superior adsorption performance of Fe3O4-CS/PDAC could be attributed to the electrostatic interaction and ion exchange between target pollutants and the grafted cationic polymer. Owing to its high adsorption capacity over a wide pH range, rapid separation, easy regeneration and good reusability, Fe3O4-CS/PDAC has great potential for practical application in water treatment.
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Affiliation(s)
- Meng Zhang
- Key Laboratory of Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing 400045, China; College of Environment and Ecology, Chongqing University, Chongqing 400045, China
| | - Zhi Zhang
- Key Laboratory of Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing 400045, China; College of Environment and Ecology, Chongqing University, Chongqing 400045, China.
| | - Yazhou Peng
- Key Laboratory of Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing 400045, China; College of Environment and Ecology, Chongqing University, Chongqing 400045, China
| | - Li Feng
- School of Civil and Transportation Engineering, Guangdong University of Technology, Guangzhou 510006, Guangdong, China.
| | - Xuhao Li
- School of Civil and Transportation Engineering, Guangdong University of Technology, Guangzhou 510006, Guangdong, China
| | - Chuanliang Zhao
- School of Civil Engineering, Chang'an University, Shaanxi, Xi'an 710061, China
| | - Khan Sarfaraz
- Key Laboratory of Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing 400045, China; College of Environment and Ecology, Chongqing University, Chongqing 400045, China
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231
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Verfaillie A, Blockx J, Praveenkumar R, Thielemans W, Muylaert K. Harvesting of marine microalgae using cationic cellulose nanocrystals. Carbohydr Polym 2020; 240:116165. [PMID: 32475603 DOI: 10.1016/j.carbpol.2020.116165] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2020] [Revised: 03/04/2020] [Accepted: 03/11/2020] [Indexed: 11/18/2022]
Abstract
Flocculation of marine microalgae is challenging because of the high ionic strength of the culture medium. We investigated cationic cellulose nanocrystals (CNCs) as biobased flocculants for the marine microalgae Nannochloropsis oculata, and compared its performance to chitosan. Cationic CNCs induced flocculation at a low dose of 11 mg L-1, while chitosan required a dose of 35 mg L-1. Our cationic CNCs possess a permanent positive charge, allowing flocculation over a wide pH-range (4 to 10). The CNC maximum flocculation efficiency was 90 %, while chitosan achieved > 95 %, attributed to small flocs remaining in suspension for CNCs. However, centrifugation for 1 min at 180 g or gravity filtration using a 30 μm nylon filter after CNC flocculation resulted in the removal of these small, stable flocs (∼150 μm diam) and > 95% harvesting efficiency. Cationic CNCs can thus serve as a sustainable alternative natural flocculant for harvesting both freshwater and marine microalgae.
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Affiliation(s)
- An Verfaillie
- Laboratory for Aquatic Biology, Department of Biology, KU Leuven, Campus Kulak Kortrijk, Etienne Sabbelaan 53 box 7659, 8500 Kortrijk, Belgium; Sustainable Materials Laboratory, Department of Chemical Engineering, KU Leuven, Campus Kulak Kortrijk, Etienne Sabbelaan 53 box 7659, 8500 Kortrijk, Belgium
| | - Jonas Blockx
- Laboratory for Aquatic Biology, Department of Biology, KU Leuven, Campus Kulak Kortrijk, Etienne Sabbelaan 53 box 7659, 8500 Kortrijk, Belgium; Sustainable Materials Laboratory, Department of Chemical Engineering, KU Leuven, Campus Kulak Kortrijk, Etienne Sabbelaan 53 box 7659, 8500 Kortrijk, Belgium
| | - Ramasamy Praveenkumar
- Department of Science and Environment, Roskilde University, Universitetvej 1 box 260, 4000 Roskilde, Denmark
| | - Wim Thielemans
- Sustainable Materials Laboratory, Department of Chemical Engineering, KU Leuven, Campus Kulak Kortrijk, Etienne Sabbelaan 53 box 7659, 8500 Kortrijk, Belgium.
| | - Koenraad Muylaert
- Laboratory for Aquatic Biology, Department of Biology, KU Leuven, Campus Kulak Kortrijk, Etienne Sabbelaan 53 box 7659, 8500 Kortrijk, Belgium.
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232
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Hofmann C, Kaiser B, Maerkl S, Duerkop A, Baeumner AJ. Cationic liposomes for generic signal amplification strategies in bioassays. Anal Bioanal Chem 2020; 412:3383-3393. [PMID: 32249343 PMCID: PMC7214507 DOI: 10.1007/s00216-020-02612-w] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2019] [Revised: 03/12/2020] [Accepted: 03/20/2020] [Indexed: 12/30/2022]
Abstract
Liposomes have been widely applied in bioanalytical assays. Most liposomes used bare negative charges to prevent non-specific binding and increase colloidal stability. Here, in contrast, highly stable, positively charged liposomes entrapping the fluorescent dye sulforhodamine B (SRB) were developed to serve as a secondary, non-specific label‚ and signal amplification tool in bioanalytical systems by exploiting their electrostatic interaction with negatively charged vesicles, surfaces, and microorganisms. The cationic liposomes were optimized for long-term stability (> 5 months) and high dye entrapment yield. Their capability as secondary, non-specific labels was first successfully proven through electrostatic interactions of cationic and anionic liposomes using dynamic light scattering, and then in a bioassay with fluorescence detection leading to an enhancement factor of 8.5 without any additional surface blocking steps. Moreover, the cationic liposomes bound efficiently to anionic magnetic beads were stable throughout magnetic separation procedures and could hence serve directly as labels in magnetic separation and purification strategies. Finally, the electrostatic interaction was exploited for the direct, simple, non-specific labeling of gram-negative bacteria. Isolated Escherichia coli cells were chosen as models and direct detection was demonstrated via fluorescent and chemiluminescent liposomes. Thus, these cationic liposomes can be used as generic labels for the development of ultrasensitive bioassays based on electrostatic interaction without the need for additional expensive recognition units like antibodies, where desired specificity is already afforded through other strategies. Graphical abstract ![]()
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Affiliation(s)
- Carola Hofmann
- Institute of Analytical Chemistry, Chemo- and Biosensors, University of Regensburg, Universitätsstraße 31, 93053, Regensburg, Germany
| | - Barbara Kaiser
- Institute of Analytical Chemistry, Chemo- and Biosensors, University of Regensburg, Universitätsstraße 31, 93053, Regensburg, Germany
| | - Susanne Maerkl
- Institute of Analytical Chemistry, Chemo- and Biosensors, University of Regensburg, Universitätsstraße 31, 93053, Regensburg, Germany
| | - Axel Duerkop
- Institute of Analytical Chemistry, Chemo- and Biosensors, University of Regensburg, Universitätsstraße 31, 93053, Regensburg, Germany
| | - Antje J Baeumner
- Institute of Analytical Chemistry, Chemo- and Biosensors, University of Regensburg, Universitätsstraße 31, 93053, Regensburg, Germany.
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233
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de Jesus VO, Ferreira VS, Lucca BG. Electrochemical study and simultaneous voltammetric determination of contraceptives ethinylestradiol and cyproterone acetate using silver nanoparticles solid amalgam electrode and cationic surfactant. Talanta 2020; 210:120610. [PMID: 31987179 DOI: 10.1016/j.talanta.2019.120610] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2019] [Revised: 11/28/2019] [Accepted: 11/30/2019] [Indexed: 12/22/2022]
Abstract
In this work we propose the voltammetric analysis of contraceptive hormones ethinylestradiol (EE) and cyproterone acetate (CPA) using solid amalgam electrode fabricated with silver nanoparticles. To the best of our knowledge, this is the first report describing the simultaneous determination of these two compounds and also the first report of the use of amalgam electrode for analysis of EE and CPA. The voltammetric behavior of both substances was investigated by their reduction. An irreversible electrochemical process involving two protons and two electrons was found for each compound. The analytical assays were carried out using staircase voltammetry (SCV). Due to this, aiming to improve the analytical sensitivity, the cationic surfactant cetyltrimethylammonium bromide was also used. The instrumental and experimental parameters were studied and optimized to achieve the best conditions for the analysis. Under the optimum conditions, the voltammetric signals of EE and CPA showed dependence on the concentration range from 6.4 × 10-7 to 7.8 × 10-6 mol L-1 and from 1.0 × 10-6 to 1.0 × 10-5 mol L-1, respectively. The limits of detection obtained were 1.03 × 10-7 mol L-1 for EE and 2.99 × 10-7 mol L-1 for CPA. The analytical usefulness of the method was evaluated through its application on the simultaneous determination of EE and CPA in pharmaceutical formulations and urine samples. The two analytes were successfully quantified in these samples with good precision and the values found presented satisfactory concordance with the reference values, suggesting acceptable analytical efficiency for the approach described here.
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Affiliation(s)
- Vanessa Oliveira de Jesus
- Instituto de Química, Universidade Federal de Mato Grosso do Sul, Campo Grande, MS, 79074-460, Brazil
| | - Valdir Souza Ferreira
- Instituto de Química, Universidade Federal de Mato Grosso do Sul, Campo Grande, MS, 79074-460, Brazil
| | - Bruno Gabriel Lucca
- Instituto de Química, Universidade Federal de Mato Grosso do Sul, Campo Grande, MS, 79074-460, Brazil.
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234
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Yin T, Liu Y, Yang M, Wang L, Zhou J, Huo M. Novel Chitosan Derivatives with Reversible Cationization and Hydrophobicization for Tumor Cytoplasm-Specific Burst Co-delivery of siRNA and Chemotherapeutics. ACS Appl Mater Interfaces 2020; 12:14770-14783. [PMID: 32149497 DOI: 10.1021/acsami.9b19373] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
Despite the great potential of combination therapy based on siRNA and chemotherapeutics, an efficient vehicle with abilities of well drug co-loading, synchronizing in vivo trafficking, and target-specific co-burst release remains elusive, which results in a suboptimal synergistic potency. Herein, a novel chitosan amphiphile (PEI-ss-HECS-ss-OA, HSPO) with glutathione (GSH)-reversible cationization and hydrophobicization by polyethylenimine (PEI) and octylamine (OA), respectively, was developed for this purpose. HSPO spontaneously assembled in aqueous solution to be a micellar system and effectively co-encapsulated the two drugs with an adjustable dosage ratio. With a surface charge inversion strategy by hyaluronic acid (HA) coating, the HA(HSPO) co-delivery micelles with a negative surface charge (-21.45 ± 1.44 mV) and suitable size (192.52 ± 7.41 nm) selectively accumulated into CD44 overexpressed A549 tumors through a combination of passive and active targeting mechanism. Then, tumor cytoplasm-selective co-burst release was obtained through GSH triggered collapse of the amphiphilic assembly alongside a decrease of positive charge condensation, finally leading to an enhanced synergistic antitumor effect with a superior inhibition ratio of 86.63%. Overall, this study validated the great promise of HSPO as an efficient site-specific rapid co-trafficking vehicle of siRNA and chemotherapeutics for a remarkable synergistic tumor inhibition.
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Affiliation(s)
- Tingjie Yin
- State Key Laboratory of Natural Medicines, Department of Pharmaceutics, China Pharmaceutical University, 24 Tongjiaxiang, Nanjing 210009, China
| | - Yanqi Liu
- State Key Laboratory of Natural Medicines, Department of Pharmaceutics, China Pharmaceutical University, 24 Tongjiaxiang, Nanjing 210009, China
| | - Mengnan Yang
- State Key Laboratory of Natural Medicines, Department of Pharmaceutics, China Pharmaceutical University, 24 Tongjiaxiang, Nanjing 210009, China
| | - Lei Wang
- Department of Pharmaceutics, Guizhou Medical University, Huaxi university town, Guian new district 550025 Guizhou, People's Republic of China
| | - Jianping Zhou
- State Key Laboratory of Natural Medicines, Department of Pharmaceutics, China Pharmaceutical University, 24 Tongjiaxiang, Nanjing 210009, China
| | - Meirong Huo
- State Key Laboratory of Natural Medicines, Department of Pharmaceutics, China Pharmaceutical University, 24 Tongjiaxiang, Nanjing 210009, China
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235
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El-Nakhel C, Petropoulos SA, Pannico A, Kyriacou MC, Giordano M, Colla G, Troise AD, Vitaglione P, De Pascale S, Rouphael Y. The bioactive profile of lettuce produced in a closed soilless system as configured by combinatorial effects of genotype and macrocation supply composition. Food Chem 2020; 309:125713. [PMID: 31708345 DOI: 10.1016/j.foodchem.2019.125713] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2019] [Revised: 09/21/2019] [Accepted: 10/14/2019] [Indexed: 12/23/2022]
Abstract
The effect of cultivar and nutrient solution macrocation proportions (SK, SCa, SMg) on the bioactive content of hydroponically cultivated lettuce was evaluated on two lettuce cultivars (red and green-pigmented Salanova®) grown in a fully controlled Fitotron® chamber. Fresh weight and color attributes were superior in green Salanova and in SK-treated plants, while elevated macrocation proportions (SK, SCa, and SMg) affected the corresponding minerals, P and Na content. SCa and SMg treatments raised ascorbate concentration and reduced nitrate levels in treated plants. Chicoric and chlorogenic acids were higher in red over green Salanova. Chlorogenic acid was higher in SCa and SMg plants and chicoric acid levels were SMg > SCa > SK. The SMg-treated red Salanova contained higher concentrations of target carotenoids. In conclusion, nutrient solution management constitutes an effective cultural practice to increase bioactive properties and functional quality of hydroponically grown lettuce.
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Affiliation(s)
- Christophe El-Nakhel
- Department of Agricultural Sciences, University of Naples Federico II, Portici, Italy
| | - Spyridon A Petropoulos
- Department of Agriculture, Crop Production and Rural Environment, University of Thessaly, Volos, Greece
| | - Antonio Pannico
- Department of Agricultural Sciences, University of Naples Federico II, Portici, Italy
| | - Marios C Kyriacou
- Department of Vegetable Crops, Agricultural Research Institute, Nicosia, Cyprus
| | - Maria Giordano
- Department of Agricultural Sciences, University of Naples Federico II, Portici, Italy
| | - Giuseppe Colla
- Department of Agriculture and Forest Sciences, University of Tuscia, 01100 Viterbo, Italy
| | - Antonio Dario Troise
- Department of Agricultural Sciences, University of Naples Federico II, Portici, Italy
| | - Paola Vitaglione
- Department of Agricultural Sciences, University of Naples Federico II, Portici, Italy
| | - Stefania De Pascale
- Department of Agricultural Sciences, University of Naples Federico II, Portici, Italy
| | - Youssef Rouphael
- Department of Agricultural Sciences, University of Naples Federico II, Portici, Italy.
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236
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Shukla SK, Kulkarni NS, Farrales P, Kanabar DD, Parvathaneni V, Kunda NK, Muth A, Gupta V. Sorafenib Loaded Inhalable Polymeric Nanocarriers against Non-Small Cell Lung Cancer. Pharm Res 2020; 37:67. [PMID: 32166411 DOI: 10.1007/s11095-020-02790-3] [Citation(s) in RCA: 33] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2019] [Accepted: 02/20/2020] [Indexed: 12/15/2022]
Abstract
PURPOSE This exploration is aimed at developing sorafenib (SF)-loaded cationically-modified polymeric nanoparticles (NPs) as inhalable carriers for improving the therapeutic efficacy of SF against non-small cell lung cancer (NSCLC). METHODS The NPs were prepared using a solvent evaporation technique while incorporating cationic agents. The optimized NPs were characterized by various physicochemical parameters and evaluated for their aerosolization properties. Several in-vitro evaluation studies were performed to determine the efficacy of our delivery carriers against NSCLC cells. RESULTS Optimized nanoparticles exhibited an entrapment efficiency of ~40%, <200 nm particle size and a narrow poly-dispersity index. Cationically-modified nanoparticles exhibited enhanced cellular internalization and cytotoxicity (~5-fold IC50 reduction vs SF) in various lung cancer cell types. The inhalable nanoparticles displayed efficient aerodynamic properties (MMAD ~ 4 μM and FPF >80%). In-vitro evaluation also resulted in a superior ability to inhibit cancer metastasis. 3D-tumor simulation studies further established the anti-cancer efficacy of NPs as compared to just SF. CONCLUSION The localized delivery of SF-loaded nanoparticles resulted in improved anti-tumor activity as compared to SF alone. Therefore, this strategy displays great potential as a novel treatment approach against certain lung cancers.
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Affiliation(s)
- Snehal K Shukla
- Department of Pharmaceutical Sciences, College of Pharmacy and Health Sciences, St. John's University, 8000 Utopia Parkway, Queens, New York, 11439, USA
| | - Nishant S Kulkarni
- Department of Pharmaceutical Sciences, College of Pharmacy and Health Sciences, St. John's University, 8000 Utopia Parkway, Queens, New York, 11439, USA
| | - Pamela Farrales
- Department of Pharmaceutical Sciences, College of Pharmacy and Health Sciences, St. John's University, 8000 Utopia Parkway, Queens, New York, 11439, USA
| | - Dipti D Kanabar
- Department of Pharmaceutical Sciences, College of Pharmacy and Health Sciences, St. John's University, 8000 Utopia Parkway, Queens, New York, 11439, USA
| | - Vineela Parvathaneni
- Department of Pharmaceutical Sciences, College of Pharmacy and Health Sciences, St. John's University, 8000 Utopia Parkway, Queens, New York, 11439, USA
| | - Nitesh K Kunda
- Department of Pharmaceutical Sciences, College of Pharmacy and Health Sciences, St. John's University, 8000 Utopia Parkway, Queens, New York, 11439, USA
| | - Aaron Muth
- Department of Pharmaceutical Sciences, College of Pharmacy and Health Sciences, St. John's University, 8000 Utopia Parkway, Queens, New York, 11439, USA
| | - Vivek Gupta
- Department of Pharmaceutical Sciences, College of Pharmacy and Health Sciences, St. John's University, 8000 Utopia Parkway, Queens, New York, 11439, USA.
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237
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Aydın HB, Cheema JA, Ammanath G, Toklucu C, Yucel M, Özenler S, Palaniappan A, Liedberg B, Yildiz UH. Pixelated colorimetric nucleic acid assay. Talanta 2020; 209:120581. [PMID: 31892020 PMCID: PMC7111824 DOI: 10.1016/j.talanta.2019.120581] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2019] [Revised: 11/17/2019] [Accepted: 11/19/2019] [Indexed: 12/12/2022]
Abstract
Conjugated polyelectrolytes (CPEs) have been widely used as reporters in colorimetric assays targeting nucleic acids. CPEs provide naked eye detection possibility by their superior optical properties however, as concentration of target analytes decrease, trace amounts of nucleic acid typically yield colorimetric responses that are not readily perceivable by naked eye. Herein, we report a pixelated analysis approach for correlating colorimetric responses of CPE with nucleic acid concentrations down to 1 nM, in plasma samples, utilizing a smart phone with an algorithm that can perform analytical testing and data processing. The detection strategy employed relies on conformational transitions between single stranded nucleic acid-cationic CPE duplexes and double stranded nucleic acid-CPE triplexes that yield distinct colorimetric responses for enabling naked eye detection of nucleic acids. Cationic poly[N,N,N-triethyl-3-((4-methylthiophen-3-yl)oxy)propan-1-aminium bromide] is utilized as the CPE reporter deposited on a polyvinylidene fluoride (PVDF) membrane for nucleic acid assay. A smart phone application is developed to capture and digitize the colorimetric response of the individual pixels of the digital images of CPE on the PVDF membrane, followed by an analysis using the algorithm. The proposed pixelated approach enables precise quantification of nucleic acid assay concentrations, thereby eliminating the margin of error involved in conventional methodologies adopted for interpretation of colorimetric responses, for instance, RGB analysis. The obtained results illustrate that a ubiquitous smart phone could be utilized for point of care colorimetric nucleic acids assays in complex matrices without requiring sophisticated software or instrumentation.
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Affiliation(s)
- Hakan Berk Aydın
- Department of Chemistry, Izmir Institute of Technology, Urla, 35430, Izmir, Turkey
| | - Jamal Ahmed Cheema
- Center for Biomimetic Sensor Science, Nanyang Technological University, 637553, Singapore; School of Materials Science and Engineering, Nanyang Technological University, 639798, Singapore
| | - Gopal Ammanath
- Center for Biomimetic Sensor Science, Nanyang Technological University, 637553, Singapore; Nanyang Institute of Technology in Health and Medicine, Interdisciplinary Graduate School, Nanyang Technological University, 637553, Singapore; School of Materials Science and Engineering, Nanyang Technological University, 639798, Singapore
| | - Cihan Toklucu
- Department of Computer Engineering, Izmir Institute of Technology, Urla, 35430, Izmir, Turkey
| | - Muge Yucel
- Department of Bioengineering, Izmir Institute of Technology, Urla, 35430, Izmir, Turkey
| | - Sezer Özenler
- Department of Chemistry, Izmir Institute of Technology, Urla, 35430, Izmir, Turkey
| | - Alagappan Palaniappan
- Center for Biomimetic Sensor Science, Nanyang Technological University, 637553, Singapore; School of Materials Science and Engineering, Nanyang Technological University, 639798, Singapore
| | - Bo Liedberg
- Center for Biomimetic Sensor Science, Nanyang Technological University, 637553, Singapore; School of Materials Science and Engineering, Nanyang Technological University, 639798, Singapore.
| | - Umit Hakan Yildiz
- Department of Chemistry, Izmir Institute of Technology, Urla, 35430, Izmir, Turkey.
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238
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França DB, Trigueiro P, Silva Filho EC, Fonseca MG, Jaber M. Monitoring diclofenac adsorption by organophilic alkylpyridinium bentonites. Chemosphere 2020; 242:125109. [PMID: 31675586 DOI: 10.1016/j.chemosphere.2019.125109] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/22/2019] [Revised: 10/07/2019] [Accepted: 10/12/2019] [Indexed: 06/10/2023]
Abstract
Organoclays have been applied as efficient adsorbents for pharmaceutical pollutants from aqueous solution. In this work, dodecylpyridinium chloride (C12pyCl) and hexadecylpyridinium chloride (C16pyCl) cationic surfactants were used for the preparation of organobentonites destined for diclofenac sodium (DFNa) adsorption, an anionic drug widely detected in wastewater. The organofunctionalization of the clay samples was performed under microwave irradiation at 50 °C for 5 min with surfactant amounts of 100% and 200% in relation to the cation exchange capacity (CEC) of the pristine bentonite. The amount of incorporated ammonium salts based on CHN elemental analysis was higher for all samples prepared with 200% of the CEC. The basal spacings of the organoclays ranged from 1.54 to 2.13 nm, indicating the entrance of organic cations into the interlayer spacing of the clay samples, and the spacing depended on the size of the alkyl organic chain. The hydrophobic character of the organobentonites was verified by thermogravimetry and infrared spectroscopy (FTIR). The adsorption isotherms showed that the drug capacity adsorption was influenced by the amount of surfactant incorporated into the bentonite, the packing density and the arrangement of the surfactants in the interlayer spacing. Zeta potential measurements of the organobentonites and FTIR analysis after drug adsorption suggested that electrostatic and nonelectrostatic interactions contributed to the mechanism of adsorption.
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Affiliation(s)
- D B França
- Universidade Federal da Paraíba, Cidade Universitária, s/n - Castelo Branco III, 58051-085, João Pessoa, PB, Brazil; Núcleo de Pesquisa e Extensão - Laboratório de Combustíveis e Materiais (NPE - LACOM), Brazil
| | - Pollyana Trigueiro
- Laboratório Interdisciplinar de Materiais Avançados (LIMAV), Centro de Tecnologia, UFPI, Teresina, Piaui, 64064-260, Brazil
| | - E C Silva Filho
- Laboratório Interdisciplinar de Materiais Avançados (LIMAV), Centro de Tecnologia, UFPI, Teresina, Piaui, 64064-260, Brazil
| | - M G Fonseca
- Universidade Federal da Paraíba, Cidade Universitária, s/n - Castelo Branco III, 58051-085, João Pessoa, PB, Brazil; Núcleo de Pesquisa e Extensão - Laboratório de Combustíveis e Materiais (NPE - LACOM), Brazil.
| | - M Jaber
- Sorbonne Université, Laboratoire d'Archéologie Moléculaire et Structurale, CNRS UMR 8220, Tour 23, 3ème étage, couloir 23-33, BP 225, 4 place Jussieu, 75005, Paris, France
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239
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Lundberg L, Bartl P, Leidlmair C, Scheier P, Gatchell M. Protonated and Cationic Helium Clusters. Molecules 2020; 25:molecules25051066. [PMID: 32120989 PMCID: PMC7179179 DOI: 10.3390/molecules25051066] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2020] [Revised: 02/20/2020] [Accepted: 02/21/2020] [Indexed: 11/30/2022] Open
Abstract
Protonated rare gas clusters have previously been shown to display markably different structures compared to their pure, cationic counterparts. Here, we have performed high-resolution mass spectrometry measurements of protonated and pristine clusters of He containing up to 50 atoms. We identify notable differences between the magic numbers present in the two types of clusters, but in contrast to heavier rare gas clusters, neither the protonated nor pure clusters exhibit signs of icosahedral symmetries. These findings are discussed in light of results from heavier rare gases and previous theoretical work on protonated helium.
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Affiliation(s)
- Linnea Lundberg
- Institut für Ionenphysik und Angewandte Physik, Universität Innsbruck, Technikerstr. 25, A-6020 Innsbruck, Austria
| | - Peter Bartl
- Institut für Ionenphysik und Angewandte Physik, Universität Innsbruck, Technikerstr. 25, A-6020 Innsbruck, Austria
| | - Christian Leidlmair
- Institut für Ionenphysik und Angewandte Physik, Universität Innsbruck, Technikerstr. 25, A-6020 Innsbruck, Austria
| | - Paul Scheier
- Institut für Ionenphysik und Angewandte Physik, Universität Innsbruck, Technikerstr. 25, A-6020 Innsbruck, Austria
| | - Michael Gatchell
- Institut für Ionenphysik und Angewandte Physik, Universität Innsbruck, Technikerstr. 25, A-6020 Innsbruck, Austria
- Department of Physics, Stockholm University, 106 91 Stockholm, Sweden
- Correspondence:
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240
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Lin FY, MacKerell AD. Improved Modeling of Cation-π and Anion-Ring Interactions Using the Drude Polarizable Empirical Force Field for Proteins. J Comput Chem 2020; 41:439-448. [PMID: 31518010 PMCID: PMC7322827 DOI: 10.1002/jcc.26067] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2019] [Revised: 07/15/2019] [Accepted: 08/25/2019] [Indexed: 12/22/2022]
Abstract
Cation-π interactions are noncovalent interactions between a π-electron system and a positively charged ion that are regarded as a strong noncovalent interaction and are ubiquitous in biological systems. Similarly, though less studied, anion-ring interactions are present in proteins along with in-plane interactions of anions with aromatic rings. As these interactions are between a polarizing ion and a polarizable π system, the accuracy of the treatment of these interactions in molecular dynamics (MD) simulations using additive force fields (FFs) may be limited. In the present work, to allow for a better description of ion-π interactions in proteins in the Drude-2013 protein polarizable FF, we systematically optimized the parameters for these interactions targeting model compound quantum mechanical (QM) interaction energies with atom pair-specific Lennard-Jones parameters along with virtual particles as selected ring centroids introduced to target the QM interaction energies and geometries. Subsequently, MD simulations were performed on a series of protein structures where ion-π pairs occur to evaluate the optimized parameters in the context of the Drude-2013 FF. The resulting FF leads to a significant improvement in reproducing the ion-π pair distances observed in experimental protein structures, as well as a smaller root-mean-square differences and fluctuations of the overall protein structures from experimental structures. Accordingly, the optimized Drude-2013 protein polarizable FF is suggested for use in MD simulations of proteins where cation-π and anion-ring interactions are critical. © 2019 Wiley Periodicals, Inc.
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Affiliation(s)
- Fang-Yu Lin
- Computer-Aided Drug Design Center, Department of Pharmaceutical Sciences, School of Pharmacy, University of Maryland, Baltimore, MD 21201, USA
| | - Alexander D. MacKerell
- Computer-Aided Drug Design Center, Department of Pharmaceutical Sciences, School of Pharmacy, University of Maryland, Baltimore, MD 21201, USA
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241
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Berta D, Buigues PJ, Badaoui M, Rosta E. Cations in motion: QM/MM studies of the dynamic and electrostatic roles of H + and Mg 2+ ions in enzyme reactions. Curr Opin Struct Biol 2020; 61:198-206. [PMID: 32065923 DOI: 10.1016/j.sbi.2020.01.002] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2019] [Revised: 01/04/2020] [Accepted: 01/06/2020] [Indexed: 12/17/2022]
Abstract
Here we discuss current trends in the simulations of enzymatic reactions focusing on phosphate catalysis. The mechanistic details of the proton transfers coupled to the phosphate cleavage is one of the key challenges in QM/MM calculations of these and other enzyme catalyzed reactions. The lack of experimental information offers both an opportunity for computations as well as often unresolved controversies. We discuss the example of small GTPases including the important human Ras protein. The high dimensionality and chemical complexity of these reactions demand carefully chosen computational techniques both in terms of the underlying quantum chemical theory and the sampling of the conformational ensemble. We also point out the important role of Mg2+ ions, and recent advances in their transient involvement in the catalytic mechanisms.
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Affiliation(s)
- Dénes Berta
- Department of Chemistry, King's College London, London, SE1 1DB, United Kingdom
| | - Pedro J Buigues
- Department of Chemistry, King's College London, London, SE1 1DB, United Kingdom
| | - Magd Badaoui
- Department of Chemistry, King's College London, London, SE1 1DB, United Kingdom
| | - Edina Rosta
- Department of Chemistry, King's College London, London, SE1 1DB, United Kingdom.
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242
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Iribarren I, Sánchez-Sanz G, Trujillo C. Anion Recognition by Neutral and Cationic Iodotriazole Halogen Bonding Scaffolds. Molecules 2020; 25:E798. [PMID: 32059506 PMCID: PMC7070532 DOI: 10.3390/molecules25040798] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2019] [Revised: 02/07/2020] [Accepted: 02/10/2020] [Indexed: 11/30/2022] Open
Abstract
A computational study of the iodide discrimination by different neutral and cationic iodotriazole halogen bonding hosts was carried out by means of Density Functional Theory. The importance of the size of the scaffold was highlighted and its impact observed in the binding energies and intermolecular X···I distances. Larger scaffolds were found to reduce the electronic repulsion and increase the overlap between the halide electron lone pair and the corresponding I-C antibonding orbital, increasing the halogen bonding interactions. Additionally, the planarity plays an important role within the interaction, and can be tuned using hydroxyl to perform intramolecular hydrogen bonds (IMHB) between the scaffold and the halogen atoms. Structures with IMHB exhibit stronger halogen bond interactions, as evidenced by the shorter intramolecular distances, larger electron density values at the bond critical point and more negative binding energies.
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Affiliation(s)
- Iñigo Iribarren
- Trinity Biomedical Sciences Institute, School of Chemistry, The University of Dublin, Trinity College, D02 R590 Dublin 2, Ireland;
| | - Goar Sánchez-Sanz
- Irish Centre of High-End Computing, Grand Canal Quay, Dublin 2, Ireland & School of Chemistry, University College Dublin, Belfield, D02 HP83 Dublin 4, Ireland;
| | - Cristina Trujillo
- Trinity Biomedical Sciences Institute, School of Chemistry, The University of Dublin, Trinity College, D02 R590 Dublin 2, Ireland;
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Rezaei Motlagh S, Harun R, Awang Biak DR, Hussain SA, Omar R, Elgharbawy AA. COSMO-RS Based Prediction for Alpha-Linolenic Acid (ALA) Extraction from Microalgae Biomass Using Room Temperature Ionic Liquids (RTILs). Mar Drugs 2020; 18:E108. [PMID: 32059424 PMCID: PMC7074282 DOI: 10.3390/md18020108] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2019] [Revised: 11/16/2019] [Accepted: 11/26/2019] [Indexed: 12/26/2022] Open
Abstract
One of the essential fatty acids with therapeutic impacts on human health is known to be omega-3 polyunsaturated fatty acids (PUFA). More lately, ionic liquids (ILs) have received significant attention among scientists in overcoming the disadvantages of traditional solvents in biomass lipid extraction. However, the large pool of cations and anions possibly accessible will lead to a growing number of innovatively synthesized ILs. Nevertheless, the exhaustive measurement of all these systems is economically impractical. The conductive screening model for real solvents (COSMO-RS) is considered a precious approach with the availability of a few models to predict the characteristics of ILs. This work introduces the estimate of capacity values at infinite dilution for a range of ILs using COSMO-RS software as part of solid-liquid extraction. This favorable outcome presented that the capacity values of the IL molecules are extremely dependent on both anions and cations. Among the 352 combinations of cation/anion tested, short alkyl chain cations coupled with inorganic anions were found to be most efficient and therefore superior in the extraction method. Sulphate-, chloride-, and bromide-based ILs were found to have higher extraction capacities in contrast with the remainders, while propanoate revealed an extraordinary capacity when combined with ethyl-based cations. Eventually, the predicted results from COSMO-RS were validated through the experimentally calculated extraction yield of alpha-linolenic acid (ALA) compound from Nannochloropsis sp. microalgae. Three selected ILs namely [EMIM][Cl], [TMAm][Cl], and [EMPyrro][Br] were selected from COSMO-RS for empirical extraction purpose and the validation results pinpointed the good prediction capability of COSMO-RS.
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Affiliation(s)
- Shiva Rezaei Motlagh
- Department of Chemical and Environmental Engineering, Faculty of Engineering, University Putra Malaysia, 43400 UPM, Serdang, Selangor, Malaysia; (S.R.M.); (D.R.A.B.); (S.A.H.); (R.O.)
| | - Razif Harun
- Department of Chemical and Environmental Engineering, Faculty of Engineering, University Putra Malaysia, 43400 UPM, Serdang, Selangor, Malaysia; (S.R.M.); (D.R.A.B.); (S.A.H.); (R.O.)
| | - Dayang Radiah Awang Biak
- Department of Chemical and Environmental Engineering, Faculty of Engineering, University Putra Malaysia, 43400 UPM, Serdang, Selangor, Malaysia; (S.R.M.); (D.R.A.B.); (S.A.H.); (R.O.)
| | - Siti Aslina Hussain
- Department of Chemical and Environmental Engineering, Faculty of Engineering, University Putra Malaysia, 43400 UPM, Serdang, Selangor, Malaysia; (S.R.M.); (D.R.A.B.); (S.A.H.); (R.O.)
| | - Rozita Omar
- Department of Chemical and Environmental Engineering, Faculty of Engineering, University Putra Malaysia, 43400 UPM, Serdang, Selangor, Malaysia; (S.R.M.); (D.R.A.B.); (S.A.H.); (R.O.)
| | - Amal A. Elgharbawy
- International Institute for Halal Research and Training (INHART), International Islamic University Malaysia, Gombak, 50728 Kuala Lumpur, Malaysia;
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244
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Fu H, Zhang C, Qiang XW, Yang YJ, Dai L, Tan ZJ, Zhang XH. Opposite Effects of High-Valent Cations on the Elasticities of DNA and RNA Duplexes Revealed by Magnetic Tweezers. Phys Rev Lett 2020; 124:058101. [PMID: 32083903 DOI: 10.1103/physrevlett.124.058101] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/08/2019] [Accepted: 01/16/2020] [Indexed: 06/10/2023]
Abstract
We report that trivalent cobalt hexammine cations decrease the persistence length, stretching modulus, helical density, and size of plectonemes formed under torque of DNA but increase those of RNA. Divalent magnesium cations, however, decrease the persistence lengths, contour lengths, and sizes of plectonemes while increasing the helical densities of both DNA and RNA. The experimental results are explained by different binding modes of the cations on DNA and RNA in our all-atom molecular dynamics simulations. The significant variations of the helical densities and structures of DNA and RNA duplexes induced by high-valent cations may affect interactions of the duplexes with proteins.
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Affiliation(s)
- Hang Fu
- College of Life Sciences, the Institute for Advanced Studies, State Key Laboratory of Virology, Hubei Key Laboratory of Cell Homeostasis, Wuhan University, Wuhan 430072, China
| | - Chen Zhang
- College of Life Sciences, the Institute for Advanced Studies, State Key Laboratory of Virology, Hubei Key Laboratory of Cell Homeostasis, Wuhan University, Wuhan 430072, China
| | - Xiao-Wei Qiang
- Center for Theoretical Physics and Key Laboratory of Artificial Micro & Nano-structures of Ministry of Education, School of Physics and Technology, Wuhan University, Wuhan 430072, China
| | - Ya-Jun Yang
- College of Life Sciences, the Institute for Advanced Studies, State Key Laboratory of Virology, Hubei Key Laboratory of Cell Homeostasis, Wuhan University, Wuhan 430072, China
| | - Liang Dai
- Department of Physics, City University of Hong Kong, Hong Kong 999077, China
| | - Zhi-Jie Tan
- Center for Theoretical Physics and Key Laboratory of Artificial Micro & Nano-structures of Ministry of Education, School of Physics and Technology, Wuhan University, Wuhan 430072, China
| | - Xing-Hua Zhang
- College of Life Sciences, the Institute for Advanced Studies, State Key Laboratory of Virology, Hubei Key Laboratory of Cell Homeostasis, Wuhan University, Wuhan 430072, China
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245
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Oh YH, Choi H, Park C, Kim DW, Lee S. Harnessing Ionic Interactions and Hydrogen Bonding for Nucleophilic Fluorination. Molecules 2020; 25:molecules25030721. [PMID: 32046021 PMCID: PMC7037423 DOI: 10.3390/molecules25030721] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2020] [Revised: 02/04/2020] [Accepted: 02/07/2020] [Indexed: 11/29/2022] Open
Abstract
We review recent works for nucleophilic fluorination of organic compounds in which the Coulombic interactions between ionic species and/or hydrogen bonding affect the outcome of the reaction. SN2 fluorination of aliphatic compounds promoted by ionic liquids is first discussed, focusing on the mechanistic features for reaction using alkali metal fluorides. The influence of the interplay of ionic liquid cation, anion, nucleophile and counter-cation is treated in detail. The role of ionic liquid as bifunctional (both electrophilic and nucleophilic) activator is envisaged. We also review the SNAr fluorination of diaryliodonium salts from the same perspective. Nucleophilic fluorination of guanidine-containing of diaryliodonium salts, which are capable of forming hydrogen bonds with the nucleophile, is exemplified as an excellent case where ionic interactions and hydrogen bonding significantly affect the efficiency of reaction. The origin of experimental observation for the strong dependence of fluorination yields on the positions of -Boc protection is understood in terms of the location of the nucleophile with respect to the reaction center, being either close to far from it. Recent advances in the synthesis of [18F]F-dopa are also cited in relation to SNAr fluorination of diaryliodonium salts. Discussions are made with a focus on tailor-making promoters and solvent engineering based on ionic interactions and hydrogen bonding.
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Affiliation(s)
- Young-Ho Oh
- Department of Applied Chemistry, Kyung Hee University, Gyeonggi 17104, Korea; (Y.-H.O.); (H.C.)
| | - Hyoju Choi
- Department of Applied Chemistry, Kyung Hee University, Gyeonggi 17104, Korea; (Y.-H.O.); (H.C.)
| | - Chanho Park
- Department of Chemistry and Chemical Engineering, Inha University, Incheon 402-751, Korea;
| | - Dong Wook Kim
- Department of Chemistry and Chemical Engineering, Inha University, Incheon 402-751, Korea;
- Correspondence: (D.W.K.); (S.L.); Tel.: +82-32-860-7679 (D.W.K.); +82-31-201-2698 (S.L.); Fax: +82-32-867-5604 (D.W.K.); +82-31-201-2340 (S.L.)
| | - Sungyul Lee
- Department of Applied Chemistry, Kyung Hee University, Gyeonggi 17104, Korea; (Y.-H.O.); (H.C.)
- Correspondence: (D.W.K.); (S.L.); Tel.: +82-32-860-7679 (D.W.K.); +82-31-201-2698 (S.L.); Fax: +82-32-867-5604 (D.W.K.); +82-31-201-2340 (S.L.)
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246
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Panigrahi A, Are VN, Jain S, Nayak D, Giri S, Sarma TK. Cationic Organic Nanoaggregates as AIE Luminogens for Wash-Free Imaging of Bacteria and Broad-Spectrum Antimicrobial Application. ACS Appl Mater Interfaces 2020; 12:5389-5402. [PMID: 31931570 DOI: 10.1021/acsami.9b15629] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
The increase in the use of bactericides is a matter of grave concern and a serious threat to human health. The present situation demands rapid and efficient detection and elimination of antibiotic-resistant microbes. Herein, we report the synthesis of a simple C3-symmetric molecular system (TGP) with an intrinsic positive charge through a single-step Schiff base condensation. In a water-dimethyl sulfoxide (DMSO) solvent mixture (80:20 v/v), TGP molecules self-aggregate to form spherical nanoparticles with a positively charged surface that displays efficient fluorescence owing to the aggregation-induced emission (AIE) phenomenon. Both Gram-positive and Gram-negative bacteria could be effectively detected through "turn-off" fluorescence spectroscopy as the electrostatic interaction of the resultant nanoaggregates with the negatively charged bacterial surface induced quenching of fluorescence of the nanoparticles. The fluorescence analysis and steady-state lifetime studies of TGP nanoparticles suggest that a nonradiative decay through photoinduced electron transfer from the nanoparticles to the bacterial surface leads to effective fluorescence quenching. Further, the TGP nanoaggregates demonstrate potent antimicrobial activity against microbes such as multidrug-resistant bacteria and fungi at a concentration as low as 74 μg/mL. A combination of factors including ionic surface characteristics of the nanoparticles for strong electrostatic binding on the bacterial surface followed by possible photoinduced electron transfer from the nanoaggregates to the bacterial membrane and enhanced oxidative stress in the membrane resulting from reactive oxygen species (ROS) generation is found accountable for the high antimicrobial activity of the TGP nanoparticles. The effective disruption of membrane integrity in both Gram-positive and Gram-negative bacteria upon interaction with the nanoaggregates can be observed from field emission scanning electron microscopy (FESEM) studies. The development of simple pathways for the molecular design of multifunctional broad-spectrum antimicrobial systems for rapid and real-time detection, wash-free imaging, and eradication of drug-resistant microbes might be crucial to combat pathogenic agents.
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Affiliation(s)
- Abhiram Panigrahi
- Discipline of Chemistry , Indian Institute of Technology Indore , Simrol, Khandwa Road , Indore 453552 , India
| | - Venkata N Are
- Centre of Biosciences and Biomedical Engineering , Indian Institute of Technology Indore , Simrol, Khandwa Road , Indore 453552 , India
| | - Siddarth Jain
- Discipline of Chemistry , Indian Institute of Technology Indore , Simrol, Khandwa Road , Indore 453552 , India
| | - Debasis Nayak
- Centre of Biosciences and Biomedical Engineering , Indian Institute of Technology Indore , Simrol, Khandwa Road , Indore 453552 , India
| | - Santanab Giri
- School of Applied Sciences and Humanities , Haldia Institute of Technology , Haldia 721657 , West Bengal , India
| | - Tridib K Sarma
- Discipline of Chemistry , Indian Institute of Technology Indore , Simrol, Khandwa Road , Indore 453552 , India
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247
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Shayesteh OH, Ghavami R. A novel label-free colorimetric aptasensor for sensitive determination of PSA biomarker using gold nanoparticles and a cationic polymer in human serum. Spectrochim Acta A Mol Biomol Spectrosc 2020; 226:117644. [PMID: 31614271 DOI: 10.1016/j.saa.2019.117644] [Citation(s) in RCA: 33] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/21/2019] [Revised: 08/25/2019] [Accepted: 10/08/2019] [Indexed: 06/10/2023]
Abstract
In this colorimetric assay for sensitive detection of prostate specific antigen (PSA) tumor marker, adsorbed non-thiolated poly-Adenine aptamer (polyA Apt) on the gold nanoparticles (AuNPs) surface was used. By incubating the AuNPs and the PSA specific aptamer prior to target addition, polyA Apt adsorbed on the gold nanoparticles and could bind the target while preventing non-specific interactions. Adsorbed polyA Apt on the AuNPs prevents aggregation of them by poly(diallyldimethylammoniumchloride) (PDDA). Upon the addition of PSA, it bind to the polyA Apt and induce the formation of a secondary structure. Therefore, interaction between polyA Apt and PDDA is repressed and PDDA induce the aggregation of the AuNPs. This analytical platform produces a remarkable optical signal in the absence and presence of PSA that accompanied by a color change from red to blue. This effect as a sensing strategy can be observed with naked eyes and quantified by colorimetry via measurement of the ratio of absorbances at 680 nm and 520 nm. Fabricated aptasensor for detection of PSA is linear in the concentration range of 0.1-100 ng/ml with 20 pg/ml as the limit of detection (S/N = 3). Because of the selectively recognized for PSA in the presence of other interfering substances, this proposed assay applied to real samples for the rapid screening of PSA.
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Affiliation(s)
- Omid Heydari Shayesteh
- Department of Chemistry, Faculty of Science, University of Kurdistan, P. O. Box 416, Sanandaj, Iran
| | - Raouf Ghavami
- Department of Chemistry, Faculty of Science, University of Kurdistan, P. O. Box 416, Sanandaj, Iran.
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248
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Delpire E, Guo J. Cryo-EM structures of DrNKCC1 and hKCC1: a new milestone in the physiology of cation-chloride cotransporters. Am J Physiol Cell Physiol 2020; 318:C225-C237. [PMID: 31747317 PMCID: PMC7052613 DOI: 10.1152/ajpcell.00465.2019] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2019] [Revised: 11/20/2019] [Accepted: 11/20/2019] [Indexed: 01/29/2023]
Abstract
New milestones have been reached in the field of cation-Cl- cotransporters with the recently released cryo-electron microscopy (EM) structures of the Danio rerio (zebrafish) Na+-K+-2Cl- cotransporter (DrNKCC1) and the human K+-Cl- cotransporter (hKCC1). In this review we provide a brief timeline that identifies the multiple breakthroughs in the field of solute carrier 12 transporters that led to the structure resolution of two of its key members. While cation-Cl- cotransporters share the overall architecture of carriers belonging to the amino acid-polyamine-organocation (APC) superfamily and some of their substrate binding sites, several new insights are gained from the two individual structures. A first major feature relates to the largest extracellular domain between transmembrane domain (TMD) 5 and TMD6 of KCC1, which stabilizes the dimer and forms a cap that likely participates in extracellular gating. A second feature is the conservation of the K+ and Cl- binding sites in both structures and evidence of an unexpected second Cl- coordination site in the KCC1 structure. Structural data are discussed in the context of previously published studies that examined the basic and kinetics properties of these cotransport mechanisms. A third characteristic is the evidence of an extracellular gate formed by conserved salt bridges between charged residues located toward the end of TMD3 and TMD4 in both transporters and the existence of an additional neighboring bridge in the hKCC1 structure. A fourth feature of these newly solved structures relates to the multiple points of contacts between the monomer forming the cotransporter homodimer units. These involve the TMDs, the COOH-terminal domains, and the large extracellular loop for hKCC1.
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Affiliation(s)
- Eric Delpire
- Department of Anesthesiology, Vanderbilt University School of Medicine, Nashville, Tennessee
| | - Jiangtao Guo
- Department of Biophysics, Department of Pathology of Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Hangzhou, China
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249
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Zheng X, Liu Q, Li M, Feng W, Yang H, Kong J. Dual atom transfer radical polymerization for ultrasensitive electrochemical DNA detection. Bioelectrochemistry 2020; 133:107462. [PMID: 32058273 DOI: 10.1016/j.bioelechem.2020.107462] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2019] [Revised: 01/16/2020] [Accepted: 01/16/2020] [Indexed: 12/13/2022]
Abstract
Atom transfer radical polymerization as a form of controlled/living radical polymerization is particularly attractive. In this work, dual atom transfer radical polymerization (ATRP) is reported for ultrasensitive DNA detection. Firstly, a peptide nucleic acid (PNA) modified with a thiol group was self-assembled on an electrode surface to capture target DNA (TDNA). The initiator of the first ATRP (ATRP-1), α-bromoisobutyric acid (BIBA), was linked to forming PNA/DNA heteroduplexes via coordination of Zr4+. The polymer chain formed by the monomer of ATRP-1 (2-(2-bromoisobutyryloxy) ethyl methacrylate, BIEM) was also one of initiators of the second ATRP (eATRP-2). The other initiator of eATRP-2 was additional BIBA. ATRP-1 involves activator regeneration by electron transfer (ARGET) ATRP, regulated via excess reducing agent. eATRP-2 is electrochemically mediated ATRP which can control the polymerization via an appropriate applied potential. Compared with one ATRP, more monomers of eATRP-2 modified with ferrocene are attached to electrode surface. Under optimal conditions, this dual ATRP strategy provides a low limit of detection (25 aM, ~150 molecules) with satisfactory selectivity and stability. Importantly, this strategy presents a useful prospect for the field of biomolecule detection.
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Affiliation(s)
- Xiaoke Zheng
- Pharmacy College, Henan University of Chinese Medicine, Zhengzhou 450046, PR China
| | - Qianrui Liu
- School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, PR China
| | - Manman Li
- Pharmacy College, Henan University of Chinese Medicine, Zhengzhou 450046, PR China
| | - Weisheng Feng
- Pharmacy College, Henan University of Chinese Medicine, Zhengzhou 450046, PR China.
| | - Huaixia Yang
- Pharmacy College, Henan University of Chinese Medicine, Zhengzhou 450046, PR China
| | - Jinming Kong
- School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, PR China.
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250
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Chan MS, Leung HM, Wong SW, Lin Z, Gao Q, Chang TJH, Lai KWC, Lo PK. Reversible reconfiguration of high-order DNA nanostructures by employing G-quartet toeholds as adhesive units. Nanoscale 2020; 12:2464-2471. [PMID: 31915778 DOI: 10.1039/c9nr08070h] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
G-quadruplex structures are becoming useful alternative interaction modules for the assembly of DNA nanomaterials because of their unique inducibility by cations. In this study, we demonstrated a new strategy for the assembly of polymeric DNA nanoarchitectures in the presence of cations, such as K+ and Na+, by employing G-quartet toeholds at the edges of discrete mini-square DNA building blocks as adhesive units. In comparison with the Watson-Crick base-paired duplex linkers, G-quadruplex arrays embedded in the self-assembled DNA system exhibit higher thermal stability. The morphology of these doughnut-shaped or spherical-shaped DNA nanostructures is highly regulated by the orientation of the folded G-quadruplexes either in parallel or antiparallel orientation in response to different cations. Furthermore, this G-quadruplex-mediated assembly strategy is able to manipulate the cycling of DNA assemblies between discrete and polymeric states by means of introducing cations and chelating agents sequentially. This property enables the reversible manipulation of the DNA-based nanosystems for at least 4 cycles. The G-quadruplex array embedded in this self-assembled DNA system can become a scaffold for functional molecules, as a number of organic molecules and proteins exhibit specific binding to these G-quadruplex structures. Besides, embedded G-quadruplexes are also considered as functional components of nanoscale electronic materials due to their electron transport through the stacked orientation of the G-quartet. Therefore, this work is an important step towards obtaining reversible, responsive G-quadruplex-induced DNA-based nanomaterials with versatile functionalities which will be highly useful in further electronic, biomedical and drug-delivery applications.
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Affiliation(s)
- Miu Shan Chan
- Department of Chemistry, City University of Hong Kong, Tat Chee Avenue, Kowloon Tong, Hong Kong SAR, China
| | - Hoi Man Leung
- Department of Chemistry, City University of Hong Kong, Tat Chee Avenue, Kowloon Tong, Hong Kong SAR, China
| | - Sze Wing Wong
- Department of Chemistry, City University of Hong Kong, Tat Chee Avenue, Kowloon Tong, Hong Kong SAR, China
| | - Zihong Lin
- Department of Biomedical Engineering, City University of Hong Kong, Tat Chee Avenue, Kowloon Tong, Hong Kong SAR, China
| | - Qi Gao
- Department of Biomedical Engineering, City University of Hong Kong, Tat Chee Avenue, Kowloon Tong, Hong Kong SAR, China
| | - Tristan Juin Han Chang
- Department of Chemistry, City University of Hong Kong, Tat Chee Avenue, Kowloon Tong, Hong Kong SAR, China
| | - King Wai Chiu Lai
- Department of Biomedical Engineering, City University of Hong Kong, Tat Chee Avenue, Kowloon Tong, Hong Kong SAR, China
| | - Pik Kwan Lo
- Department of Chemistry, City University of Hong Kong, Tat Chee Avenue, Kowloon Tong, Hong Kong SAR, China and Key Laboratory of Biochip Technology, Biotech and Health Care, Shenzhen Research Institute of City University of Hong Kong, Shenzhen 518057, China.
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