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Han Z, Liu R, Zhang L, Song J, Bai Y, Lu X. Bright Luminescence of Free Radical TEMPO Enabled by Electrochemiluminescence Technique. Anal Chem 2024; 96:7304-7310. [PMID: 38651947 DOI: 10.1021/acs.analchem.4c01411] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/25/2024]
Abstract
Radicals can feature theoretically 100% light utilization owing to their nonelectron spin-forbidden transition and represent the most advanced luminescent materials at present. 2,2,6,6-Tetramethyl-1-piperidinyloxy (TEMPO) acts as a typically stable radical with very broad applications. However, their luminescent properties have not been discovered to date. In the present work, we observed the bright electrochemiluminescence (ECL) emission of TEMPO with a higher efficiency (72.3%) via the electrochemistry and coreactant strategies for the first time. Moreover, the radical-based ECL achieved high detection toward boron acid with a lower limit of detection (LOD) of 1.9 nM. This study offers a new approach to generate emissions for some unconventional luminophores and makes a major breakthrough in the field of new luminescent materials as well.
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Affiliation(s)
- Zhengang Han
- Key Laboratory of Water Environment Protection in Plateau Intersection (Ministry of Education), Key Laboratory of Bioelectrochemistry and Environmental Analysis of Gansu Province, College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou 730070, People's Republic of China
| | - Ruirui Liu
- Key Laboratory of Water Environment Protection in Plateau Intersection (Ministry of Education), Key Laboratory of Bioelectrochemistry and Environmental Analysis of Gansu Province, College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou 730070, People's Republic of China
| | - Lijun Zhang
- Key Laboratory of Water Environment Protection in Plateau Intersection (Ministry of Education), Key Laboratory of Bioelectrochemistry and Environmental Analysis of Gansu Province, College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou 730070, People's Republic of China
| | - Jiangyun Song
- Key Laboratory of Water Environment Protection in Plateau Intersection (Ministry of Education), Key Laboratory of Bioelectrochemistry and Environmental Analysis of Gansu Province, College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou 730070, People's Republic of China
| | - Yunfeng Bai
- Key Laboratory of Water Environment Protection in Plateau Intersection (Ministry of Education), Key Laboratory of Bioelectrochemistry and Environmental Analysis of Gansu Province, College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou 730070, People's Republic of China
| | - Xiaoquan Lu
- Key Laboratory of Water Environment Protection in Plateau Intersection (Ministry of Education), Key Laboratory of Bioelectrochemistry and Environmental Analysis of Gansu Province, College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou 730070, People's Republic of China
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Milyaeva PA, Nefedova LN. Boric Acid Resistance in Drosophila melanogaster Depends on the Expression Level of the Cyp9b2 Gene. RUSS J GENET+ 2022. [DOI: 10.1134/s1022795422040093] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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The anticoagulant effect of Apis mellifera phospholipase A 2 is inhibited by CORM-2 via a carbon monoxide-independent mechanism. J Thromb Thrombolysis 2020; 49:100-107. [PMID: 31679116 DOI: 10.1007/s11239-019-01980-0] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Bee venom phospholipase A2 (PLA2) has potential for significant morbidity. Ruthenium (Ru)-based carbon monoxide releasing molecules (CORM) inhibit snake venoms that are anticoagulant and contain PLA2. In addition to modulating heme-bearing proteins with carbon monoxide, these CORM generate reactive Ru species that form adducts with histamine residues resulting in changes in protein function. This study sought to identify anticoagulant properties of bee venom PLA2 via catalysis of plasma phospholipids required for thrombin generation. Another goal was to determine if Ru-based CORM inhibit bee venom PLA2 via carbon monoxide release or via potential binding of reactive Ru species to a key histidine residue in the catalytic site of the enzyme. Anticoagulant activity of bee venom PLA2 was assessed via thrombelastography with normal plasma. Bee venom PLA2 was then exposed to different CORM and a metheme forming agent and anticoagulant activity was reassessed. Using Ru, boron and manganese-based CORM and a metheme forming agent, it was demonstrated that it was unlikely that carbon monoxide interaction with a heme group attached to PLA2 was responsible for inhibition of anticoagulant activity by Ru-based CORM. Exposure of PLA2 to a Ru-based CORM in the presence of histidine-rich human albumin resulted in loss of inhibition of PLA2. Ru-based CORM likely inhibit bee venom PLA2 anticoagulant activity via formation of reactive Ru species that bind to histidine residues of the enzyme.
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Shin S, Eom Y, Lee ES, Hwang SY, Oh DX, Park J. Malleable Hydrogel Embedded with Micellar Cargo-Expellers as a Prompt Transdermal Patch. Adv Healthc Mater 2020; 9:e2000876. [PMID: 32902150 DOI: 10.1002/adhm.202000876] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2020] [Indexed: 11/08/2022]
Abstract
Although hydrogels are promising transdermal patches, they face spatiotemporal problems related to controlled drug release. From the "spatio" perspective, hydrogels are not malleable, therefore they do not fully contact curved skin, such as that found on the nose and fingers. From the "temporal" perspective, the internal network of a hydrogel retards cargo release. Herein, a malleable and rapid-cargo-releasing poly(vinyl alcohol)-borax hydrogel that embeds freely mobile poly(hydroxyethyl methacrylate) (PHEMA) micelles is prepared. The in situ polymerization of PHEMA within the matrix produces large compound micelle particles that are not bound by the matrix. The micelles act as expellers by sweeping out cargo upon exposure to wet conditions through a concentration gradient. The hydrogel embedded with the micellar cargo-expellers delivers a 25-fold larger 3-min release quantity of Nile Red (a model cargo) than the control hydrogel. The particles absorb mechanical shocks and the dynamic borate-diol bonds engender the hydrogel with self-healing properties, which results in a hydrogel that tightly contacts highly curved skin. Moreover, the hydrogel shows no toxicity in in vivo and skin irritation tests. This malleable hydrogel will inspire novel prompt skin-patch systems for pharmaceutical and cosmetics purposes.
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Affiliation(s)
- Sung‐Ho Shin
- Research Center for Bio‐based Chemistry Korea Research Institute of Chemical Technology (KRICT) Ulsan 44429 Republic of Korea
| | - Youngho Eom
- Department of Polymer Engineering Pukyong National University Busan 48513 Republic of Korea
| | - Eun Seong Lee
- Department of Biotechnology The Catholic University of Korea Bucheon Gyeonggi‐do 14662 Republic of Korea
| | - Sung Yeon Hwang
- Research Center for Bio‐based Chemistry Korea Research Institute of Chemical Technology (KRICT) Ulsan 44429 Republic of Korea
- Advanced Materials and Chemical Engineering University of Science and Technology (UST) Daejeon 34113 Republic of Korea
| | - Dongyeop X. Oh
- Research Center for Bio‐based Chemistry Korea Research Institute of Chemical Technology (KRICT) Ulsan 44429 Republic of Korea
- Advanced Materials and Chemical Engineering University of Science and Technology (UST) Daejeon 34113 Republic of Korea
| | - Jeyoung Park
- Research Center for Bio‐based Chemistry Korea Research Institute of Chemical Technology (KRICT) Ulsan 44429 Republic of Korea
- Advanced Materials and Chemical Engineering University of Science and Technology (UST) Daejeon 34113 Republic of Korea
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Application of Heteronuclear NMR Spectroscopy to Bioinorganic and Medicinal Chemistry ☆. REFERENCE MODULE IN CHEMISTRY, MOLECULAR SCIENCES AND CHEMICAL ENGINEERING 2018. [PMCID: PMC7157447 DOI: 10.1016/b978-0-12-409547-2.10947-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Zhang G, Lu S, Qian J, Zhong K, Yao J, Cai D, Cheng Z, Wu Z. Magnetic Relaxation Switch Detecting Boric Acid or Borate Ester through One-Pot Synthesized Poly(vinyl alcohol) Functionalized Nanomagnetic Iron Oxide. ACS APPLIED MATERIALS & INTERFACES 2015; 7:16837-16841. [PMID: 26171794 DOI: 10.1021/acsami.5b04863] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
We developed a highly efficient magnetic relaxation switch (MRS) system based on poly(vinyl alcohol) functionalized nanomagnetic iron oxide (PVA@NMIO) particles for the detection of boric acid or borate ester (BA/BE). It was found that the addition of BA/BE induced the aggregation of PVA@NMIO particles, resulting in a measurable change in the T2 relaxation time in magnetic resonance measurements. The main mechanism was proposed that the electron-deficient boron atoms of BA/BE caused the aggregation of PVA@NMIO particles through covalent binding to the hydroxyl groups of PVA. This novel detection system displayed excellent selectivity, high sensitivity, and rapid detection for BA/BE. Thus, this system may provide a great application prospect for detection of BA/BE.
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Affiliation(s)
- Guilong Zhang
- †Key Laboratory of Ion Beam Bioengineering Hefei Institutes of Physical Science, Chinese Academy of Sciences and Anhui Province, Hefei, 230031, People's Republic of China
- ‡University of Science and Technology of China, Hefei 230026, People's Republic of China
| | - Shiyao Lu
- †Key Laboratory of Ion Beam Bioengineering Hefei Institutes of Physical Science, Chinese Academy of Sciences and Anhui Province, Hefei, 230031, People's Republic of China
| | - Junchao Qian
- ∥High Magnetic Field Laboratory, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, 230031, People's Republic of China
| | - Kai Zhong
- ∥High Magnetic Field Laboratory, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, 230031, People's Republic of China
| | - Jianming Yao
- †Key Laboratory of Ion Beam Bioengineering Hefei Institutes of Physical Science, Chinese Academy of Sciences and Anhui Province, Hefei, 230031, People's Republic of China
| | - Dongqing Cai
- †Key Laboratory of Ion Beam Bioengineering Hefei Institutes of Physical Science, Chinese Academy of Sciences and Anhui Province, Hefei, 230031, People's Republic of China
| | - Zhiliang Cheng
- §Department of Bioengineering, University of Pennsylvania, 240 Skirkanich Hall, 210 South 33rd Street, Philadelphia, Pennsylvania 19104, United States
| | - Zhengyan Wu
- †Key Laboratory of Ion Beam Bioengineering Hefei Institutes of Physical Science, Chinese Academy of Sciences and Anhui Province, Hefei, 230031, People's Republic of China
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Comparison of the effects of CORM-2, CORM-3 and CORM-A1 on coagulation in human plasma. Blood Coagul Fibrinolysis 2014; 25:801-5. [DOI: 10.1097/mbc.0000000000000146] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
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Ronconi L, Sadler PJ. Applications of heteronuclear NMR spectroscopy in biological and medicinal inorganic chemistry. Coord Chem Rev 2008; 252:2239-2277. [PMID: 32226090 PMCID: PMC7094630 DOI: 10.1016/j.ccr.2008.01.016] [Citation(s) in RCA: 56] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2007] [Accepted: 01/15/2008] [Indexed: 11/30/2022]
Abstract
There is a wide range of potential applications of inorganic compounds, and metal coordination complexes in particular, in medicine but progress is hampered by a lack of methods to study their speciation. The biological activity of metal complexes is determined by the metal itself, its oxidation state, the types and number of coordinated ligands and their strength of binding, the geometry of the complex, redox potential and ligand exchange rates. For organic drugs a variety of readily observed spin I = 1/2 nuclei can be used (1H, 13C, 15N, 19F, 31P), but only a few metals fall into this category. Most are quadrupolar nuclei giving rise to broad lines with low detection sensitivity (for biological systems). However we show that, in some cases, heteronuclear NMR studies can provide new insights into the biological and medicinal chemistry of a range of elements and these data will stimulate further advances in this area.
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Key Words
- ADP, adenosine diphosphate
- AES, atomic emission spectroscopy
- AMP, adenosine monophosphate
- ATP, adenosine triphosphate
- BNCT, boron neutron capture therapy
- BPG, 2,3-bisphosphoglycerate
- BSA, bovine serum albumin
- BSH, sodium borocaptate
- Bioinorganic chemistry
- Biological systems
- DNA, deoxyribonucleic acid
- EDTA-N4, ethylenediaminetetraacetamide
- EFG, electric field gradient
- GMP, guanosine monophosphate
- HMQC, heteronuclear multiple quantum correlation
- Heteronuclear NMR spectroscopy
- Im, imidazole
- In, indazole
- MQF, multiple quantum filtered
- MRI, magnetic resonance imaging
- Medicinal inorganic chemistry
- Metallopharmaceuticals
- NOE, nuclear Overhauser effect
- PET, positron emission tomography
- Quadrupolar nuclei
- RBC, red blood cell
- RNA, ribonucleic acid
- SDS, sodium dodecyl sulfate
- rRNA, ribosomal ribonucleic acid
- tRNA, transfer ribonucleic acid
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Affiliation(s)
- Luca Ronconi
- School of Chemistry, University of Edinburgh, West Mains Road, Edinburgh EH9 3JJ, UK
| | - Peter J Sadler
- Department of Chemistry, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UK
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Ozbas B, Rajagopal K, Haines-Butterick L, Schneider JP, Pochan DJ. Reversible stiffening transition in beta-hairpin hydrogels induced by ion complexation. J Phys Chem B 2007; 111:13901-8. [PMID: 18044866 DOI: 10.1021/jp075117p] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We have previously shown that properly designed lysine and valine-rich peptides undergo a random coil to beta-hairpin transition followed by intermolecular self-assembly into a fibrillar hydrogel network only after the peptide solutions are heated above the intramolecular folding transition temperature. Here we report that these hydrogels also undergo a stiffening transition as they are cooled below a critical temperature only when boric acid is used to buffer the peptide solution. This stiffening transition is characterized by rheology, dynamic light scattering, and small angle neutron scattering. Rheological measurements show that the stiffening transition causes an increase in the hydrogel storage modulus (G') by as much as 1 order of magnitude and is completely reversible on subsequently raising the temperature. Although this reversible transition exhibits rheological properties that are similar to polyol/borax solutions, the underlying mechanism does not involve hydroxyl-borate complexation. The stiffening transition is mainly caused by the interactions between lysine and boric acid/borate anion and is not driven by the changes in the secondary structure of the beta-hairpin peptide. Addition of glucose to boric acid and peptide solution disrupts the stiffening transition due to competitive glucose-borate complexation.
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Affiliation(s)
- Bulent Ozbas
- Department of Materials Science and Engineering, Delaware Biotechnology Institute, Newark, Delaware 19716, USA
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Transue TR, Gabel SA, London RE. NMR and Crystallographic Characterization of Adventitious Borate Binding by Trypsin. Bioconjug Chem 2006; 17:300-8. [PMID: 16536459 DOI: 10.1021/bc0502210] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Recent 11B NMR studies of the formation of ternary complexes of trypsin, borate, and S1-binding alcohols revealed evidence for an additional binding interaction external to the enzyme active site. We have explored this binding interaction as a prototypical interaction of borate and boronate ligands with residues on the protein surface. NMR studies of trypsin in which the active site is blocked with leupeptin or with the irreversible inhibitor 4-(2-aminoethyl) benzenesulfonyl fluoride hydrochloride (AEBSF) indicate the existence of a low-affinity borate binding site with an apparent dissociation constant of 97 mM, measured at pH 8.0. Observation of a field-dependent dynamic frequency shift of the (11)B resonance indicates that it corresponds to a complex for which omegatau >> 1. The 0.12 ppm shift difference of the borate resonances measured at 11.75 and 7.05 T, corresponds to a quadrupole coupling constant of 260 kHz. A much larger 2.0 ppm shift is observed in the 11B NMR spectra of trypsin complexed with benzene boronic acid (BBA), leading to a calculated quadrupole coupling constant of 1.1 MHz for this complex. Crystallographic studies identify the second borate binding site as a serine-rich region on the surface of the molecule. Specifically, a complex obtained at pH 10.6 shows a borate ion covalently bonded to the hydroxyl oxygen atoms of Ser164 and Ser167, with additional stabilization coming from two hydrogen-bonding interactions. A similar structure, although with low occupancy (30%), is observed for a trypsin-BBA complex. In this case, the BBA is also observed in the active site, covalently bound in two different conformations to both His57 Nepsilon and Ser195 Ogamma. An analysis of pairwise hydroxyl oxygen distances was able to predict the secondary borate binding site in porcine trypsin, and this approach is potentially useful for prediction of borate binding sites on the surfaces of other proteins. However, the distances between the Ser164/Ser167 Ogamma atoms in all of the reported trypsin crystal structures is significantly greater than the Ogamma distances of 2.2 and 1.9 angstroms observed in the trypsin complexes with borate and BBA, respectively. Thus, the ability of the hydroxyl oxygens to adopt a sufficiently close orientation to allow bidentate ligation is a critical limit on the borate binding affinity of surface-accessible serine/threonine/tyrosine residues.
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Affiliation(s)
- Thomas R Transue
- National Institute of Environmental Health Sciences, Laboratory of Structural Biology, Box 12233, Research Triangle Park, North Carolina 27709, USA
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Abstract
This review focuses mainly on the detection and investigation of molecules used for boron neutron capture therapy (BNCT) by 10B and 11B NMR. In this binary radiation treatment, boron-containing molecules (also called 'BNCT agents') enriched in the 10B isotope, are targeted to the tumor, and irradiated with thermal or epithermal neutrons. Capture of these neutrons by 10B nuclei generates cell-damaging radiation, confined to single cell dimensions. NMR research efforts have primarily been applied in two directions: first, to investigate the metabolism and pharmaco-kinetics of BNCT agents in-vivo, and second, to use localized NMR spectroscopy and/or MRI for non-invasive mapping of the administered molecules in treated animals or patients. While the first goal can be pursued using 11B NMR for natural-abundance samples (80% 11B / 20% 10B), molecules used in the actual treatment are > 95% enriched in 10B, and must therefore be detected by 10B NMR. Both 10B (spin 3) and 11B (spin 3/2) are quadrupolar nuclei, and their typical relaxation times, in common BNCT agents in biological environments, are rather short. This poses some technical challenges, particularly for MRI, which will be reviewed, along with possible solutions. The first attempts at 11B NMR and MRI detection of BNCT agents in biological tissue were conducted over a decade ago. Since then, results from 11B MRI in laboratory animals and in humans have been reported, and 11B NMR spectroscopy provided interesting and unique information about the metabolism of some BNCT agents in cultured cells. 10B NMR was applied either 'indirectly' (in double-resonance experiments involving coupled protons), but also by direct 10B MRI in mice. However, no results involving the NMR detection of 10B-enriched compounds in treated patients have been reported yet.
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Affiliation(s)
- Peter Bendel
- Chemical Research Support Department, The Weizmann Institute of Science, Rehovot 76100, Israel.
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Torres AM, Philp DJ, Kemp-Harper R, Garvey C, Kuchel PW. Determination of Na+ binding parameters by relaxation analysis of selected 23Na NMR coherences: RNA, BSA and SDS. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2005; 43:217-224. [PMID: 15625720 DOI: 10.1002/mrc.1541] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Nuclear magnetic resonance provides several unique means of investigating the interactions between different inorganic ions and various macromolecules. (23)Na is a quadrupolar nucleus, meaning that relaxation analysis of the various coherences allows the measurement of its binding to biological macromolecules. In this study, we analyzed the quadrupolar relaxation of (23)Na(+) longitudinal magnetization and single- and triple-quantum coherences in aqueous systems containing RNA, bovine serum albumin and sodium dodecyl sulfate micelles. The effectiveness of the James-Noggle method for determining binding constants was evaluated in these systems, and also the applicability of various (23)Na coherences in providing information on the extent and affinity of binding to the three different classes of biomolecules.
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Affiliation(s)
- Allan M Torres
- School of Molecular and Microbial Biosciences, University of Sydney, Sydney, New South Wales 2006, Australia
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Rabiller-Baudry M, Chaufer B. Small molecular ion adsorption on proteins and DNAs revealed by separation techniques. J Chromatogr B Analyt Technol Biomed Life Sci 2004; 797:331-45. [PMID: 14630159 DOI: 10.1016/s1570-0232(03)00488-4] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Ion binding is a term that assumes that the ion is included in the solvation sphere characterising the biomolecule. The binding forces are not clearly stated except for electrostatic attraction; weak forces (hydrogen bonds and Van der Waals forces) are likely involved. Many publications have dealt with ion binding to proteins and the consequences over the past 10 years, but only a few studies were performed using high-performance liquid chromatography (HPLC: ion exchange, reversed phase without the well-identified immobilised metal affinity chromatography) and capillary zone electrophoresis (CZE). This review focuses on the binding of proteins and DNAs mainly to the oxyanions (phosphate, borate, citrate) and amines used as buffers for both the HPLC eluent and the background electrolyte of CZE. Such specific ion adsorption on biomolecules is evidenced by physico-chemical characteristics such as the mobility or retention volume, closely associated with the net charge, which differ from the expected or experimental data obtained under the conditions of an indifferent electrolyte. It is shown that ion binding to proteins is a key parameter in the electrostatic repulsion between the free protein and a fouled membrane in the ultrafiltration separation of a protein mixture.
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Affiliation(s)
- Murielle Rabiller-Baudry
- Laboratoire des Procédés de Séparation, Université Rennes 1, UC INRA, Campus de Beaulieu, Bat. 10A, 263 Avenue du Général Leclerc, CS 74205, 35042 Rennes Cedex, France.
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