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Rogkotis K, Matsia S, Likotrafiti E, Rhoades J, Kountouras D, Katakalos K, Pavlidou E, Ritzoulis C, Salifoglou A. Selective antimicrobial food packaging of composite poly(lactic acid) cobalt-citrate films. Food Packag Shelf Life 2022. [DOI: 10.1016/j.fpsl.2022.100959] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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2
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Halevas E, Matsia S, Hatzidimitriou A, Geromichalou E, Papadopoulos T, Katsipis G, Pantazaki A, Litsardakis G, Salifoglou A. A unique ternary Ce(III)-quercetin-phenanthroline assembly with antioxidant and anti-inflammatory properties. J Inorg Biochem 2022; 235:111947. [DOI: 10.1016/j.jinorgbio.2022.111947] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2022] [Revised: 07/15/2022] [Accepted: 07/24/2022] [Indexed: 10/16/2022]
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Matsia S, Kaoulla A, Menelaou M, Hatzidimitriou A, Papadopoulos T, Reimann M, Pöttgen R, Salifoglou A. Structural speciation in chemical reactivity profiling of binary-ternary systems of Ni(II) with iminodialcohol and aromatic chelators. Polyhedron 2022. [DOI: 10.1016/j.poly.2021.115577] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Matsia S, Tsave O, Hatzidimitriou A, Gabriel C, Salifoglou A. The aqueous structural speciation of binary thallium-hydroxycarboxylic acid systems. Structure-chemical (bio)reactivity correlations. J Inorg Biochem 2021; 222:111469. [PMID: 34192625 DOI: 10.1016/j.jinorgbio.2021.111469] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2021] [Revised: 03/25/2021] [Accepted: 04/24/2021] [Indexed: 11/28/2022]
Abstract
Among transition and non-transition metals, thallium is a unique case of an element which, despite its known toxicity, provides interesting challenges through its biology and chemistry linked to diagnosis of human pathophysiologies. Poised to investigate in-depth the structural and electronic aspects of thallium involvement in physiological processes, the synthetic exploration of aqueous binary systems of Tl(I) with physiological binders from the family of hydroxycarboxylic acids (glycolic, lactic, mandelic and citric acid) was pursued in a pH-specific fashion. The isolated crystalline coordination polymers, emerging from that effort, were physicochemically characterized through elemental analysis, FT-IR, ESI-MS, 1H-/13C-NMR, and X-ray crystallography. The coordination environment of thallium in each molecular Tl(I) assembly, along with lattice dimensionality (2D3D), reflects the contributions of the ligands, collectively exemplifying interactions probed into though BVS and Hirshfeld surface analysis. The results portray a well-defined solid-state and solution profile for all species investigated, thereby providing the basis for their subsequent selection into in vitro biological studies involving the (patho)physiological cell lines 3T3-L1, Saos-2, C2C12, and MCF-7. Biotoxicity profiles, encompassing cell viability, morphology, and cell growth support clearly a concentration-, time-, and cell tissue-specific behavior for the chosen Tl(I) compounds in a structure-specific fashion. Collectively, the chemical experimental data support the biological results in formulating a structure-specific behavior for Tl(I)-hydroxycarboxylato species with respect to biotoxicity mechanisms in a (patho)physiological environment. The accrued knowledge stands as the foreground for further investigation into the relevant biological chemistry of Tl(I) and molecular technologies targeting its sequestration and removal from cellular media.
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Affiliation(s)
- S Matsia
- Laboratory of Inorganic Chemistry and Advanced Materials, School of Chemical Engineering, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece
| | - O Tsave
- Laboratory of Inorganic Chemistry and Advanced Materials, School of Chemical Engineering, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece
| | - A Hatzidimitriou
- Laboratory of Inorganic Chemistry, Department of Chemistry, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece
| | - C Gabriel
- Laboratory of Inorganic Chemistry and Advanced Materials, School of Chemical Engineering, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece; Center for Research of the Structure of Matter, Magnetic Resonance Laboratory, School of Chemical Engineering, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece
| | - A Salifoglou
- Laboratory of Inorganic Chemistry and Advanced Materials, School of Chemical Engineering, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece.
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Tsave O, Salifoglou A. Biomimetic activity of soluble, well-defined, aqueous Ti(IV)-citrate species toward adipogenesis. An in vitro study. J Inorg Biochem 2020; 214:111290. [PMID: 33242718 DOI: 10.1016/j.jinorgbio.2020.111290] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2020] [Revised: 10/08/2020] [Accepted: 10/19/2020] [Indexed: 12/20/2022]
Abstract
Metal-organic complexes bearing physiological substrates have been the target of several investigations, probing into the potential of well-defined atoxic metalloforms to influence fundamental cellular processes overcoming insulin resistance in Diabetes mellitus 2. Outstanding cases of such metals include zinc and vanadium, both being the target of intense synthetic and biological studies toward insulin mimesis. Owing to the close proximity in the periodic table, an early transition metal, titanium, emerges as another potential candidate of biologically relevant complexation, reflecting species capable of promoting insulin mimetic activity. Driven by the so far explored aqueous synthetic chemistry of Ti(IV)-hydroxycaboxylato systems, a well-defined Ti(IV)-citrate compound was synthesized under physiological conditions, isolated, and characterized, followed by its introduction in biological assays, targeting adipogenic events linked to glucose uptake and catabolism. The mononuclear Ti(IV)-citrate complex was introduced to 3T3-L1 cells, thereby probing into its biological activity (toxicity, morphology, migration, and adipogenic capacity). The results project an atoxic profile for the Ti(IV)-citrate species, thus justifying further incorporation in cellular differentiation processes, leading to mature adipocytes in a time- and concentration-dependent fashion. The experiments suggest that Ti(IV)-citrate is a competent agent promoting fibroblast differentiation, as evidenced by key adipogenic biomarkers, while concurrently exhibiting synergistic/enhancing action with insulin. The collective results show, for the first time, that an appropriately configured soluble-bioavailable complex Ti(IV) form exhibits a distinctly unique bioprofile, thereby lending credence to the notion that titanium metallopharmaceuticals hold merit as competent agents in adipogenesis and insulin mimesis in Diabetes mellitus.
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Affiliation(s)
- O Tsave
- Laboratory of Inorganic Chemistry and Advanced Materials, School of Chemical Engineering, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece; 1st Department of Internal Medicine, AHEPA, University Hospital, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece
| | - A Salifoglou
- Laboratory of Inorganic Chemistry and Advanced Materials, School of Chemical Engineering, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece.
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Tsave O, Iordanidou C, Gabriel C, Hatzidimitriou A, Salifoglou A. Binary-ternary Cd(II)-(hydroxycarboxylic acid)-(aromatic chelator) systems exhibit in vitro cytotoxic selectivity in a tissue-specific manner. J Inorg Biochem 2019; 195:201-215. [PMID: 30986671 DOI: 10.1016/j.jinorgbio.2019.02.009] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2018] [Revised: 02/16/2019] [Accepted: 02/18/2019] [Indexed: 02/08/2023]
Abstract
Cadmium is a metallotoxin, amply encountered in the environment and derived through physical and anthropogenic activities. Its entry in various organisms leads through water and the food chain to humans, thereby inducing a plethora of pathophysiologies. Delineation of the interactive role of cadmium with physiological and physiologically relevant substrates, requires well-defined forms of cadmium arising from such interactions along with the ensuing chemical reactivity amounting to toxic manifestations and health aberrations. To implement such efforts, low molecular mass substrate metal ion binders are needed, forming species with enhanced solubility and bioavailability. To that end, α-hydroxy isobutyric acid (HIBAH2) was used in pH-specific synthetic efforts involving bulky aromatic chelators 2,2'-bipyridine (2,2'-bipy) and 1,10-phenanthroline (phen), thus leading to new crystalline materials [Cd(C4H7O3)2]n(1), [Cd(C4H7O3)2(H2O)2](2), [{Cd2(C4H7O3)2(C10H8N2)2(H2O)2}(NO3)2]n·nH2O(3), and [{Cd2(C4H7O3)2(C12H8N2)2(H2O)2}(NO3)2]n·2nH2O(4), which were physicochemically characterized (elemental analysis, FT-IR, NMR, ESI-MS, and X-ray crystallography) in the solid state and solution. Their physicochemical characteristics led to their employment in tissue-specific biological toxicity studies in three different cell lines. Their toxicity profile (cell viability, morphology, chemotacticity) was correlated through genetic biomarkers to apoptotic-necrotic processes, thereby shedding light on cadmium cellular toxicity processes. Finally, the cytoprotective action of specific chelators was examined, lending credence to the notion that appropriately structured chelators and antioxidants may be used as effective deterrent to cadmium toxicity. Collectively, structure-specificity linked to tissue-specific toxicity profiling in well-defined binary-ternary Cd(II)-HIBAH2 systems exemplifies that metal ion's aberrant interactions in the cellular milieu, meriting further probing into the development of efficient chelators in cadmium detoxification.
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Affiliation(s)
- O Tsave
- Laboratory of Inorganic Chemistry and Advanced Materials, Department of Chemical Engineering, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece
| | - C Iordanidou
- Laboratory of Inorganic Chemistry and Advanced Materials, Department of Chemical Engineering, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece
| | - C Gabriel
- Laboratory of Inorganic Chemistry and Advanced Materials, Department of Chemical Engineering, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece
| | - A Hatzidimitriou
- Laboratory of Inorganic Chemistry, Department of Chemistry, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece
| | - A Salifoglou
- Laboratory of Inorganic Chemistry and Advanced Materials, Department of Chemical Engineering, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece.
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Tsave O, Halevas E, Yavropoulou MP, Yovos E, Hatzidimitriou A, Psycharis V, Ypsilantis K, Stathi P, Salifoglou A. V(v)-Schiff base species induce adipogenesis through structure-specific influence of genetic targets. NEW J CHEM 2019. [DOI: 10.1039/c9nj02520k] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Appropriately designed Schiff-base substrates enhance V(v)-bioavailability and insulin-mimetic biomolecular gene profiling, inducing adipogenesis in a structure-specific manner.
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Affiliation(s)
- O. Tsave
- Laboratory of Inorganic Chemistry and Advanced Materials
- Department of Chemical Engineering
- Aristotle University of Thessaloniki
- Thessaloniki 54124
- Greece
| | - E. Halevas
- Laboratory of Inorganic Chemistry and Advanced Materials
- Department of Chemical Engineering
- Aristotle University of Thessaloniki
- Thessaloniki 54124
- Greece
| | - M. P. Yavropoulou
- Division of Clinical and Molecular Endocrinology
- 1st Department of Internal Medicine
- AHEPA
- University Hospital
- Aristotle University of Thessaloniki
| | - E. Yovos
- Division of Clinical and Molecular Endocrinology
- 1st Department of Internal Medicine
- AHEPA
- University Hospital
- Aristotle University of Thessaloniki
| | - A. Hatzidimitriou
- Laboratory of Inorganic Chemistry
- Department of Chemistry
- Aristotle University of Thessaloniki
- Thessaloniki 54124
- Greece
| | - V. Psycharis
- Institute of Nanoscience and Nanotechnology
- NCSR “Demokritos”
- Aghia Paraskevi 15310
- Greece
| | - K. Ypsilantis
- Department of Chemistry
- University of Ioannina
- Ioannina 45110
- Greece
| | - P. Stathi
- Laboratory of Physical Chemistry of Materials & Environment
- Department of Physics
- University of Ioannina
- Ioannina 45110
- Greece
| | - A. Salifoglou
- Laboratory of Inorganic Chemistry and Advanced Materials
- Department of Chemical Engineering
- Aristotle University of Thessaloniki
- Thessaloniki 54124
- Greece
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Halevas E, Papadopoulos TA, Swanson CH, Smith GC, Hatzidimitriou A, Katsipis G, Pantazaki A, Sanakis I, Mitrikas G, Ypsilantis K, Litsardakis G, Salifoglou A. In-depth synthetic, physicochemical and in vitro biological investigation of a new ternary V(IV) antioxidant material based on curcumin. J Inorg Biochem 2018; 191:94-111. [PMID: 30476714 DOI: 10.1016/j.jinorgbio.2018.10.010] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2018] [Revised: 10/21/2018] [Accepted: 10/23/2018] [Indexed: 01/28/2023]
Abstract
Curcumin is a natural product with a broad spectrum of beneficial properties relating to pharmaceutical applications, extending from traditional remedies to modern cosmetics. The biological activity of such pigments, however, is limited by their solubility and bioavailability, thereby necessitating new ways of achieving optimal tissue cellular response and efficacy as drugs. Metal ion complexation provides a significant route toward improvement of curcumin stability and biological activity, with vanadium being a representative such metal ion, amply encountered in biological systems and exhibiting exogenous bioactivity through potential pharmaceuticals. Driven by the need to optimally increase curcumin bioavailability and bioactivity through complexation, synthetic efforts were launched to seek out stable species, ultimately leading to the synthesis and isolation of a new ternary V(IV)-curcumin-(2,2'-bipyridine) complex. Physicochemical characterization (elemental analysis, FT-IR, Thermogravimetry (TGA), UV-Visible, NMR, ESI-MS, Fluorescence, X-rays) portrayed the solid-state and solution properties of the ternary complex. Pulsed-EPR spectroscopy, in frozen solutions, suggested the presence of two species, cis- and trans-conformers. Density Functional Theory (DFT) calculations revealed the salient features and energetics of the two conformers, thereby complementing EPR spectroscopy. The well-described profile of the vanadium species led to its in vitro biological investigation involving toxicity, cell metabolism inhibition in S. cerevisiae cultures, Reactive Oxygen Species (ROS)-suppressing capacity, lipid peroxidation, and plasmid DNA degradation. A multitude of bio-assays and methodologies, in comparison to free curcumin, showed that it exhibits its antioxidant potential in a concentration-dependent fashion, thereby formulating a bioreactivity profile supporting development of new efficient vanado-pharmaceuticals, targeting (extra)intra-cellular processes under (patho)physiological conditions.
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Affiliation(s)
- E Halevas
- Laboratory of Inorganic Chemistry and Advanced Materials, Department of Chemical Engineering, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece; Laboratory of Materials for Electrotechnics, Department of Electrical and Computer Engineering, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece
| | - T A Papadopoulos
- Department of Natural Sciences, Thornton Science Park, University of Chester, Chester, CH3 4NU, UK
| | - C H Swanson
- Department of Natural Sciences, Thornton Science Park, University of Chester, Chester, CH3 4NU, UK
| | - G C Smith
- Department of Natural Sciences, Thornton Science Park, University of Chester, Chester, CH3 4NU, UK
| | - A Hatzidimitriou
- Laboratory of Inorganic Chemistry, Department of Chemistry, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece
| | - G Katsipis
- Laboratory of Biochemistry, Department of Chemistry, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece
| | - A Pantazaki
- Laboratory of Biochemistry, Department of Chemistry, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece
| | - I Sanakis
- Institute of Nanoscience and Nanotechnology, N.C.S.R. "Demokritos", Aghia Paraskevi 15310, Attiki, Greece
| | - G Mitrikas
- Institute of Nanoscience and Nanotechnology, N.C.S.R. "Demokritos", Aghia Paraskevi 15310, Attiki, Greece
| | - K Ypsilantis
- Department of Chemistry, University of Ioannina, Ioannina 45110, Greece
| | - G Litsardakis
- Laboratory of Materials for Electrotechnics, Department of Electrical and Computer Engineering, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece
| | - A Salifoglou
- Laboratory of Inorganic Chemistry and Advanced Materials, Department of Chemical Engineering, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece.
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Iordanidou C, Tsave O, Gabriel C, Hatzidimitriou A, Salifoglou A. Synthetic exploration of the binary cadmium-quinic acid system linked to in vitro cytotoxicity and chelation cytoprotection investigation. Inorganica Chim Acta 2018. [DOI: 10.1016/j.ica.2018.06.011] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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Tsave O, Yavropoulou MP, Kafantari M, Gabriel C, Yovos JG, Salifoglou A. Comparative assessment of metal-specific adipogenic activity in zinc and vanadium-citrates through associated gene expression. J Inorg Biochem 2018; 186:217-227. [PMID: 29966853 DOI: 10.1016/j.jinorgbio.2018.04.020] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2017] [Revised: 04/21/2018] [Accepted: 04/29/2018] [Indexed: 01/12/2023]
Abstract
Diabetes mellitus comprises a group of metabolic abnormalities due to insulin deficiency and/or resistance. Obesity contributes to diabetes, with a strong causal relationship existing between diabetes and insulin resistance, especially in patients with Diabetes mellitus II. Adipocytes emerge as key constituents of adipose tissue physiology. In their pre-mature form to mature state transformation, adipocytes fully exemplify one of the key adipogenic actions of insulin. Poised to a) gain insight into adipogenesis leading to antidiabetic factors, and b) investigate adipogenesis through careful examination of insulin contributions to interwoven mechanistic pathways, a systematic comparative study was launched involving well-defined metal-citrates (zinc and vanadium), the chemical reactivity of which was in line with their chemistry under physiological conditions. Selection of the specific compounds was based on their common aqueous coordination chemistry involving the physiological chelator citric acid. Cellular maturation of pre-adipocytes to their mature form was pursued in the presence-absence of insulin and employment of closely linked genetic targets, key to adipocyte maturation (Peroxisome proliferator-activated receptor gamma (PPAR-γ), Glucose transporter 1,3,4 (GLUT 1,3,4), Adiponectin (ADIPOQ), Glucokinase (GCK), and Insulin receptor (INS-R)). The results show a) distinct adipogenic biological profiles for the metalloforms involved in a dose-, time- and nature-dependent manner, and b) metal ion-specific adipogenic response-signals at the same or higher level than insulin toward all selected targets. Collectively, the foundations have been established for future exploitation of the distinct metal-specific adipogenic factors contributing to the functional maturation of adipose tissue and their use toward hyperglycemic control in Diabetes mellitus.
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Affiliation(s)
- O Tsave
- Laboratory of Inorganic Chemistry and Advanced Materials, Department of Chemical Engineering, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece
| | - M P Yavropoulou
- Division of Clinical and Molecular Endocrinology, 1(st) Department of Internal Medicine, AHEPA, University Hospital, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece
| | - M Kafantari
- Laboratory of Inorganic Chemistry and Advanced Materials, Department of Chemical Engineering, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece
| | - C Gabriel
- Laboratory of Inorganic Chemistry and Advanced Materials, Department of Chemical Engineering, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece; Center for Research of the Structure of Matter, Magnetic Resonance Laboratory, Department of Chemical Engineering, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece
| | - J G Yovos
- Division of Clinical and Molecular Endocrinology, 1(st) Department of Internal Medicine, AHEPA, University Hospital, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece
| | - A Salifoglou
- Laboratory of Inorganic Chemistry and Advanced Materials, Department of Chemical Engineering, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece.
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Tsave O, Gabriel C, Kafantari M, Yavropoulou M, Yovos JG, Raptopoulou CP, Psycharis V, Terzis A, Mateescu C, Salifoglou A. Synthetic investigation of binary-ternary Cr(III)-hydroxycarboxylic acid-aromatic chelator systems. Structure-specific influence on adipogenic biomarkers linked to insulin mimesis. J Inorg Biochem 2018; 184:50-68. [PMID: 29679800 DOI: 10.1016/j.jinorgbio.2018.02.001] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2017] [Revised: 02/03/2018] [Accepted: 02/04/2018] [Indexed: 01/02/2023]
Abstract
In an attempt to understand the aqueous interactions of Cr(III) with low-molecular mass physiological ligands and examine its role as an adipogenic metallodrug agent in Diabetes mellitus II, the pH-specific synthesis in the binary-ternary Cr(III)-(HA = hydroxycarboxylic acid)-(N,N)-aromatic chelator (AC) (HA = 2-hydroxyethyl iminodiacetic acid/heidaH2, quinic acid; AC = 1,10-phenanthroline/phen) systems was pursued, leading to four new crystalline compounds. All materials were characterized by elemental analysis, UV-Visible, FT-IR, and ESI-MS spectroscopy, cyclic voltammetry, and X-Ray crystallography. Concurrently, the aqueous speciation of the binary Cr(III)-(2-hydroxyethyl iminodiacetic acid) system, complemented by ESI-MS, provided key-details of the species in solution correlating with the solid-state species. The structurally distinct Cr(III) soluble species were subsequently used in an in vitro investigation of their cytotoxic activity in 3T3-L1 fibroblast cultures. Compound 1 exhibited solubility, bioavailability, and atoxicity over a wide concentration range (0.1-100 μΜ) in contrast to 3, which was toxic. The adipogenic potential of 1 was subsequently investigated toward transformation of pre-adipocytes into mature adipocytes. Confirmation of that capacity relied on molecular biological techniques a) involving genes (glucose transporter type 4, peroxisome proliferator-activated receptor gamma, glucokinase, and adiponectin) serving as sensors of the transformation process, b) comparing the Cr(III)-adipogenicity potential to that of insulin, and c) exemplifying the ultimate maturity of adipocytes poised to catabolize glucose. The collective effort points out salient structural features in the coordination sphere of Cr(III) inducing adipogenic transformation relevant to combating hyperglycemia. The multiply targeted mechanistic insight into such a process exemplifies the role of well-defined Cr(III) complex forms as potential insulin-mimetic adipogenic agents in Diabetes mellitus II.
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Affiliation(s)
- O Tsave
- Laboratory of Inorganic Chemistry and Advanced Materials, Department of Chemical Engineering, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece
| | - C Gabriel
- Laboratory of Inorganic Chemistry and Advanced Materials, Department of Chemical Engineering, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece; Center for Research of the Structure of Matter, Magnetic Resonance Laboratory, Department of Chemical Engineering, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece
| | - M Kafantari
- Laboratory of Inorganic Chemistry and Advanced Materials, Department of Chemical Engineering, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece
| | - M Yavropoulou
- Division of Clinical and Molecular Endocrinology, 1st Department of Internal Medicine, AHEPA, University Hospital, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece
| | - J G Yovos
- Division of Clinical and Molecular Endocrinology, 1st Department of Internal Medicine, AHEPA, University Hospital, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece
| | - C P Raptopoulou
- Institute of Nanoscience and Nanotechnology, NCSR "Demokritos", Aghia Paraskevi 15310, Attiki, Greece
| | - V Psycharis
- Institute of Nanoscience and Nanotechnology, NCSR "Demokritos", Aghia Paraskevi 15310, Attiki, Greece
| | - A Terzis
- Institute of Nanoscience and Nanotechnology, NCSR "Demokritos", Aghia Paraskevi 15310, Attiki, Greece
| | - C Mateescu
- National Institute for Research and Development in Electrochemistry and Condensed Matter (INCEMC), Strada Dr. A. Paunescu Podeanu, nr.144, Timisoara 300569, Timis, Romania
| | - A Salifoglou
- Laboratory of Inorganic Chemistry and Advanced Materials, Department of Chemical Engineering, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece.
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Halevas E, Tsave O, Yavropoulou M, Yovos JG, Hatzidimitriou A, Psycharis V, Salifoglou A. In vitro structure-specific Zn(II)-induced adipogenesis and structure-function bioreactivity correlations. J Inorg Biochem 2017; 177:228-246. [PMID: 29073545 DOI: 10.1016/j.jinorgbio.2017.09.002] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2017] [Revised: 08/21/2017] [Accepted: 09/04/2017] [Indexed: 01/30/2023]
Abstract
The advent of Zn(II) metallodrugs in metabolic syndrome pathologies generates a strong challenge toward synthetic endeavors targeting well-defined, atoxic and biologically active binary/ternary species of Zn(II). Proper formulation of that metal ion's coordination sphere sets the stage for construction of appropriately configured Schiff ligands based on tromethamine and variably modified vanillin core components. The arising Schiff ligands react with Zn(II) in a defined stoichiometry, thereby delivering new binary Zn(II)-L species with defined physicochemical properties. Analytical (elemental), spectroscopic (FT-IR, Thermogravimetric Analysis) and crystallographic techniques attest to the distinct nature of the derived binary-ternary materials, bearing defined Zn(II):L molecular stoichiometry, variable nuclearity, charge, bulk and balance mix of hydrophilicity-hydrophobicity, thereby providing the physicochemical profile based on which biological studies could ensue. The structurally based selection of species was applied onto in vitro 3T3-L1 cultures, essentially exploring toxicity, migration, morphology, cell differentiation and maturation. The systematic effort toward comparative work on appropriately defined Zn(II) species and insulin in inducing adipogenesis reveals the salient structural features in the Schiff family of ligands configuring Zn(II) so as to promote complex formation sufficient to engage biomolecular targets during the process of initiation and maturation. Molecular targets of importance in adipogenesis were examined under the influence of Zn(II) and their expression levels suggest the structural composition that a Zn(II) ion might have to optimally pursue cell differentiation. Thus, a well-defined selection of binary Zn(II)-L species is tightly associated with the incurred bioactivity, thereby setting the stage for the development of efficient Zn(II) metallodrugs to combat Diabetes mellitus II.
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Affiliation(s)
- E Halevas
- Laboratory of Inorganic Chemistry and Advanced Materials, Department of Chemical Engineering, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece
| | - O Tsave
- Laboratory of Inorganic Chemistry and Advanced Materials, Department of Chemical Engineering, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece
| | - M Yavropoulou
- Laboratory of Clinical and Molecular Endocrinology, 1st Department of Internal Medicine, AHEPA University Hospital, Aristotle University of Thessaloniki, Thessaloniki 54636, Greece
| | - J G Yovos
- Laboratory of Clinical and Molecular Endocrinology, 1st Department of Internal Medicine, AHEPA University Hospital, Aristotle University of Thessaloniki, Thessaloniki 54636, Greece
| | - A Hatzidimitriou
- Laboratory of Inorganic Chemistry, Department of Chemistry, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece
| | - V Psycharis
- Institute of Advanced Materials, Physicochemical Processes, Nanotechnology and Microsystems, Department of Materials Science, N.C.S.R. "Demokritos", Agia Paraskevi 15310, Attiki, Greece
| | - A Salifoglou
- Laboratory of Inorganic Chemistry and Advanced Materials, Department of Chemical Engineering, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece.
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13
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Iordanidou C, Tsave O, Gabriel C, Hatzidimitriou A, Yavropoulou MP, Mateescu C, Salifoglou A. Synthetic endeavors on cadmium species bearing glycolate and aromatic chelators with structure-specific biotoxic correlations in vitro. J Inorg Biochem 2017; 176:38-52. [PMID: 28846894 DOI: 10.1016/j.jinorgbio.2017.07.028] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2017] [Revised: 07/16/2017] [Accepted: 07/26/2017] [Indexed: 11/30/2022]
Abstract
Cadmium is a well-known metallotoxin widespread in the environment and easily reaching cellular targets in lower and higher organisms, including humans. The form(s) of that metal ion through which it interacts with biomolecular targets in a cellular milieu are critical in cell survival. Poised to investigate the structure-specific activity of Cd(II) in a cellular environment and delve into the associated biotoxic processes, binary and ternary systems of that metal ion in the presence of the physiological α-hydroxycarboxylic acid glycolic acid and aromatic (N,N')-binders 2,2'-bipyridine (2,2'-bipy) and 4,4'-bipyridine (4,4'-bipy) were examined synthetically in aqueous media and a pH-specific fashion. The arising new materials [Cd(C2H3O3)2]n (1), [Cd(C2H3O3)(C10H8N2)(NO3)]n·nH2O (2), and {[Cd(C2H3O3)(C10H8N2)(H2O)](NO3)}n·2nH2O (3) project coordination polymers, which were physicochemically characterized through elemental analysis, FT-IR, NMR, luminescence and X-ray crystallography. The distinct spectroscopic features of 1-3, with luminescence exemplifying distinct behavior (2,3), further corroborated by crystallographic analysis, lend credence to a structure-specific selection of species employed in ensuing in vitro biological studies. The emerging results in two different cell lines (3T3-L1, Saos-2) reveal a concentration-dependent, structure-specific and cell line-specific toxicity profile of Cd(II), reflecting its coordination composition and formulation, rendering it soluble and bioavailable (1,2). Mechanistic information riding on caspase-dependent investigation unravels that metal ion's specific behavior compromising cell survival and integrity. Employment of ethylenediamine tetraacetic acid (EDTA) a) shows efficient sequestration of Cd(II) away from its toxic reactivity denoting the strength of interactions involved, and b) lends credence to further development of appropriately configured organic binders, selectively providing molecular protection from Cd(II) toxicity.
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Affiliation(s)
- C Iordanidou
- Laboratory of Inorganic Chemistry, Department of Chemical Engineering, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece
| | - O Tsave
- Laboratory of Inorganic Chemistry, Department of Chemical Engineering, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece
| | - C Gabriel
- Laboratory of Inorganic Chemistry, Department of Chemical Engineering, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece; Center for Research of the Structure of Matter, Magnetic Resonance Laboratory, Department of Chemical Engineering, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece
| | - A Hatzidimitriou
- Laboratory of Inorganic Chemistry, Department of Chemistry, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece
| | - M P Yavropoulou
- Division of Clinical and Molecular Endocrinology, 1st Department of Internal Medicine, AHEPA, University Hospital, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece
| | - C Mateescu
- National Institute for Research and Development in Electrochemistry and Condensed Matter (INCEMC), Strada Dr. A. Paunescu Podeanu, nr. 144, Timisoara 300569, Timis, Romania
| | - A Salifoglou
- Laboratory of Inorganic Chemistry, Department of Chemical Engineering, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece.
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14
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Halevas E, Chatzigeorgiou E, Hadjispyrou S, Hatzidimitriou A, Psycharis V, Salifoglou A. pH- and ligand structure-specific synthesis, structure-lattice dimensionality and spectroscopic fingerprint in novel binary In(III)-hydroxycarboxylic acid materials. Polyhedron 2017. [DOI: 10.1016/j.poly.2016.08.003] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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15
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Nday C, Halevas E, Tsiaprazi-Stamou A, Eleftheriadou D, Hatzidimitriou A, Jackson G, Reid D, Salifoglou A. Synthetic investigation, physicochemical characterization and antibacterial evaluation of ternary Bi(III) systems with hydroxycarboxylic acid and aromatic chelator substrates. J Inorg Biochem 2017; 170:98-108. [DOI: 10.1016/j.jinorgbio.2017.02.007] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2016] [Revised: 02/01/2017] [Accepted: 02/09/2017] [Indexed: 02/02/2023]
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16
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Halevas E, Hatzidimitriou A, Gabriel C, Mateescu C, Salifoglou A. Systematic pH-specific synthesis and structure transformations in binary-ternary In(III) assemblies with hydroxycarboxylic DPOT and aliphatic-aromatic chelators. Inorganica Chim Acta 2016. [DOI: 10.1016/j.ica.2016.07.051] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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17
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Halevas E, Nday CM, Salifoglou A. Hybrid catechin silica nanoparticle influence on Cu(II) toxicity and morphological lesions in primary neuronal cells. J Inorg Biochem 2016; 163:240-249. [PMID: 27301643 DOI: 10.1016/j.jinorgbio.2016.04.017] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2015] [Revised: 04/07/2016] [Accepted: 04/12/2016] [Indexed: 02/01/2023]
Abstract
Morphological alterations compromising inter-neuronal connectivity may be directly linked to learning-memory deficits in Central Nervous System neurodegenerative processes. Cu(II)-mediated oxidative stress plays a pivotal role in regulating redox reactions generating reactive oxygen species (ROS) and reactive nitrogen species (RNS), known contributors to Alzheimer's disease (AD) pathology. The antioxidant properties of flavonoid catechin have been well-documented in neurodegenerative processes. However, the impact that catechin encapsulation in nanoparticles may have on neuronal survival and morphological lesions has been poorly demonstrated. To investigate potential effects of nano-encapsulated catechin on neuronal survival and morphological aberrations in primary rat hippocampal neurons, poly(ethyleneglycol) (PEG) and cetyltrimethylammonium bromide (CTAB)-modified silica nanoparticles were synthesized. Catechin was loaded on silica nanoparticles in a concentration-dependent fashion, and release studies were carried out. Further physicochemical characterization of the new nano-materials included elemental analysis, particle size, z-potential, FT-IR, Brunauer-Emmett-Teller (BET), thermogravimetric (TGA), and scanning electron microscopy (SEM) analysis in order to optimize material composition linked to the delivery of loaded catechin in the hippocampal cellular milieu. The findings reveal that, under Cu(II)-induced oxidative stress, the loading ability of the PEGylated/CTAB silica nanoparticles was concentration-dependent, based on their catechin release profile. The overall bio-activity profile of the new hybrid nanoparticles a) denoted their enhanced protective activity against oxidative stress and hippocampal cell survival compared to previously reported quercetin, b) revealed that morphological lesions affecting neuronal integrity can be counterbalanced at high copper concentrations, and c) warrants in-depth perusal of molecular events underlying neuronal function and degeneration, collectively linked to preventive nanotechnology in neurodegeneration.
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Affiliation(s)
- E Halevas
- Laboratory of Inorganic Chemistry, Department of Chemical Engineering, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece
| | - C M Nday
- Laboratory of Inorganic Chemistry, Department of Chemical Engineering, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece
| | - A Salifoglou
- Laboratory of Inorganic Chemistry, Department of Chemical Engineering, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece.
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18
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Tsave O, Halevas E, Yavropoulou MP, Kosmidis Papadimitriou A, Yovos JG, Hatzidimitriou A, Gabriel C, Psycharis V, Salifoglou A. Structure-specific adipogenic capacity of novel, well-defined ternary Zn(II)-Schiff base materials. Biomolecular correlations in zinc-induced differentiation of 3T3-L1 pre-adipocytes to adipocytes. J Inorg Biochem 2015; 152:123-37. [PMID: 26383120 DOI: 10.1016/j.jinorgbio.2015.08.014] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2015] [Revised: 08/02/2015] [Accepted: 08/05/2015] [Indexed: 10/23/2022]
Abstract
Among the various roles of zinc discovered to date, its exogenous activity as an insulin mimetic agent stands as a contemporary challenge currently under investigation and a goal to pursue in the form of a metallodrug against type 2 Diabetes Mellitus. Poised to investigate the adipogenic potential of Zn(II) and appropriately configure its coordination sphere into well-defined anti-diabetic forms, (a) a series of new well-defined ternary dinuclear Zn(II)-L (L=Schiff base ligands with a variable number of alcoholic moieties) compounds were synthesized and physicochemically characterized, (b) their cytotoxicity and migration effect(s) in both pre- and mature adipocytes were assessed, (c) their ability to effectively induce cell differentiation of 3T3-L1 pre-adipocytes into mature adipocytes was established, and (d) closely linked molecular targets involving or influenced by the specific Zn(II) forms were perused through molecular biological techniques, cumulatively delineating factors involved in Zn(II)-induced adipogenesis. Collectively, the results (a) reveal the significance of key structural features of Schiff ligands coordinated to Zn(II), thereby influencing its (a)toxicity behavior and insulin-like activity, (b) project molecular targets influenced by the specific forms of Zn(II) formulating its adipogenic potential, and (c) exemplify the interwoven relationship between Zn(II)-L structural speciation and insulin mimetic biological activity, thereby suggesting ways of fine tuning structure-specific zinc-induced adipogenicity in future efficient antidiabetic drugs.
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Affiliation(s)
- O Tsave
- Laboratory of Inorganic Chemistry, Department of Chemical Engineering, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece
| | - E Halevas
- Laboratory of Inorganic Chemistry, Department of Chemical Engineering, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece
| | - M P Yavropoulou
- Laboratory of Clinical and Molecular Endocrinology, 1st Department of Internal Medicine, AHEPA, University Hospital, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece
| | - A Kosmidis Papadimitriou
- Laboratory of Inorganic Chemistry, Department of Chemical Engineering, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece
| | - J G Yovos
- Laboratory of Clinical and Molecular Endocrinology, 1st Department of Internal Medicine, AHEPA, University Hospital, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece
| | - A Hatzidimitriou
- Laboratory of Inorganic Chemistry, Department of Chemistry, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece
| | - C Gabriel
- Laboratory of Inorganic Chemistry, Department of Chemical Engineering, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece; Center for Research of the Structure of Matter, Magnetic Resonance Laboratory, Department of Chemical Engineering, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece
| | - V Psycharis
- Institute of Advanced Materials, Physicochemical Processes, Nanotechnology and Microsystems, Department of Materials Science, N.C.S.R. "Demokritos", Aghia Paraskevi 15310, Attiki, Greece
| | - A Salifoglou
- Laboratory of Inorganic Chemistry, Department of Chemical Engineering, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece.
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19
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Halevas E, Nday CM, Kaprara E, Psycharis V, Raptopoulou CP, Jackson GE, Litsardakis G, Salifoglou A. Sol-gel encapsulation of binary Zn(II) compounds in silica nanoparticles. Structure-activity correlations in hybrid materials targeting Zn(II) antibacterial use. J Inorg Biochem 2015. [PMID: 26198972 DOI: 10.1016/j.jinorgbio.2015.06.004] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
In the emerging issue of enhanced multi-resistant properties in infectious pathogens, new nanomaterials with optimally efficient antibacterial activity and lower toxicity than other species attract considerable research interest. In an effort to develop such efficient antibacterials, we a) synthesized acid-catalyzed silica-gel matrices, b) evaluated the suitability of these matrices as potential carrier materials for controlled release of ZnSO4 and a new Zn(II) binary complex with a suitably designed well-defined Schiff base, and c) investigated structural and textural properties of the nanomaterials. Physicochemical characterization of the (empty-loaded) silica-nanoparticles led to an optimized material configuration linked to the delivery of the encapsulated antibacterial zinc load. Entrapment and drug release studies showed the competence of hybrid nanoparticles with respect to the a) zinc loading capacity, b) congruence with zinc physicochemical attributes, and c) release profile of their zinc load. The material antimicrobial properties were demonstrated against Gram-positive (Staphylococcus aureus, Bacillus subtilis, Bacillus cereus) and negative (Escherichia coli, Pseudomonas aeruginosa, Xanthomonas campestris) bacteria using modified agar diffusion methods. ZnSO4 showed less extensive antimicrobial behavior compared to Zn(II)-Schiff, implying that the Zn(II)-bound ligand enhances zinc antimicrobial properties. All zinc-loaded nanoparticles were less antimicrobially active than zinc compounds alone, as encapsulation controls their release, thereby attenuating their antimicrobial activity. To this end, as the amount of loaded zinc increases, the antimicrobial behavior of the nano-agent improves. Collectively, for the first time, sol-gel zinc-loaded silica-nanoparticles were shown to exhibit well-defined antimicrobial activity, justifying due attention to further development of antibacterial nanotechnology.
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Affiliation(s)
- E Halevas
- Laboratory of Inorganic Chemistry, Department of Chemical Engineering, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece
| | - C M Nday
- Laboratory of Inorganic Chemistry, Department of Chemical Engineering, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece; Department of Chemistry, University of Cape Town, Rondebosch 7700, Cape Town, South Africa
| | - E Kaprara
- Laboratory of Analytical Chemistry, Department of Chemical Engineering, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece
| | - V Psycharis
- Institute of Advanced Materials, Physicochemical Processes, Nanotechnology and Microsystems, N.C.S.R. "Demokritos", Aghia Paraskevi 15310, Attiki, Greece
| | - C P Raptopoulou
- Institute of Advanced Materials, Physicochemical Processes, Nanotechnology and Microsystems, N.C.S.R. "Demokritos", Aghia Paraskevi 15310, Attiki, Greece
| | - G E Jackson
- Department of Chemistry, University of Cape Town, Rondebosch 7700, Cape Town, South Africa
| | - G Litsardakis
- Laboratory of Materials for Electrotechnics, Department of Electrical and Computer Engineering, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece
| | - A Salifoglou
- Laboratory of Inorganic Chemistry, Department of Chemical Engineering, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece.
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20
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Halevas E, Tsave O, Yavropoulou M, Hatzidimitriou A, Yovos J, Psycharis V, Gabriel C, Salifoglou A. Design, synthesis and characterization of novel binary V(V)-Schiff base materials linked with insulin-mimetic vanadium-induced differentiation of 3T3-L1 fibroblasts to adipocytes. Structure–function correlations at the molecular level. J Inorg Biochem 2015; 147:99-115. [DOI: 10.1016/j.jinorgbio.2015.03.009] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2014] [Revised: 03/14/2015] [Accepted: 03/16/2015] [Indexed: 11/30/2022]
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21
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Menelaou M, Vournari E, Psycharis V, Raptopoulou CP, Terzis A, Tangoulis V, Sanakis Y, Mateescu C, Salifoglou A. Heptanuclear antiferromagnetic Fe(III)-D-(-)-quinato assemblies with an S = 3/2 ground state-pH-specific synthetic chemistry, spectroscopic, structural, and magnetic susceptibility studies. Inorg Chem 2013; 52:13849-60. [PMID: 24266671 DOI: 10.1021/ic401036e] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Iron is an essential metal ion with numerous roles in biological systems and advanced abiotic materials. D-(-)-quinic acid is a cellular metal ion chelator, capable of promoting reactions with metal M(II,III) ions under pH-specific conditions. In an effort to comprehend the chemical reactivity of well-defined forms of Fe(III)/Fe(II) toward α-hydroxycarboxylic acids, pH-specific reactions of: (a) [Fe3O(CH3COO)6(H2O)3]·(NO3)·4H2O with D-(-)-quinic acid in a molar ratio 1:3 at pH 2.5 and (b) Mohr's salt with D-(-)-quinic acid in a molar ratio 1:3 at pH 7.5, respectively, led to the isolation of the first two heptanuclear Fe(III)-quinato complexes, [Fe7O3(OH)3(C7H10O6)6]·20.5H2O (1) and (NH4)[Fe7(OH)6(C7H10O6)6]·(SO4)2·18H2O (2). Compounds 1 and 2 were characterized by analytical, spectroscopic (UV-vis, FT-IR, EPR, and Mössbauer) techniques, CV, TGA-DTG, and magnetic susceptibility measurements. The X-ray structures of 1 and 2 reveal heptanuclear assemblies of six Fe(III) ions bound by six doubly deprotonated quinates and one Fe(III) ion bound by oxido- and hydroxido-bridges (1), and hydroxido-bridges (2), all in an octahedral fashion. Mössbauer spectroscopy on 1 and 2 suggests the presence of Fe(III) ions in an all-oxygen environment. EPR measurements indicate that 1 and 2 retain their structure in solution, while magnetic measurements reveal an overall antiferromagnetic behavior with a ground state S = 3/2. The collective physicochemical properties of 1 and 2 suggest that the (a) nature of the ligand, (b) precursor form of iron, (c) pH, and (d) molecular stoichiometry are key factors influencing the chemical reactivity of the binary Fe(II,III)-hydroxycarboxylato systems, their aqueous speciation, and ultimately through variably emerging hydrogen bonding interactions, the assembly of multinuclear Fe(III)-hydroxycarboxylato clusters with distinct lattice architectures of specific dimensionality (2D-3D) and magnetic signature.
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Affiliation(s)
- M Menelaou
- Laboratory of Inorganic Chemistry, Department of Chemical Engineering, Aristotle University of Thessaloniki , Thessaloniki 54124, Greece
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22
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Georgantas V, Menelaou M, Psycharis V, Raptopoulou CP, Terzis A, Tangoulis V, Mateescu C, Salifoglou A. Aromatic Chelator-Specific Lattice Architecture and Dimensionality in Binary and Ternary Cu(II)-Organophosphonate Materials. Inorg Chem 2013; 52:4963-76. [DOI: 10.1021/ic302598d] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- V. Georgantas
- Department
of Chemical Engineering, Aristotle University of Thessaloniki, Thessaloniki
54124, Greece
| | - M. Menelaou
- Department
of Chemical Engineering, Aristotle University of Thessaloniki, Thessaloniki
54124, Greece
| | - V. Psycharis
- Institute
of Materials Science, NCSR “Demokritos”, Aghia Paraskevi
15310, Attiki, Greece
| | - C. P. Raptopoulou
- Institute
of Materials Science, NCSR “Demokritos”, Aghia Paraskevi
15310, Attiki, Greece
| | - A. Terzis
- Institute
of Materials Science, NCSR “Demokritos”, Aghia Paraskevi
15310, Attiki, Greece
| | - V. Tangoulis
- Department
of Chemistry, Aristotle University of Thessaloniki, Thessaloniki 54124,
Greece
| | - C. Mateescu
- Banat’s University
of Agricultural Sciences and Veterinary Medicine from Timisoara, Timisoara
300645, Romania
| | - A. Salifoglou
- Department
of Chemical Engineering, Aristotle University of Thessaloniki, Thessaloniki
54124, Greece
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23
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Mateescu C, Gabriel C, Raptopoulou C, Terzis A, Tangoulis V, Salifoglou A. pH-Specific synthesis, spectroscopic, structural and magnetic, and aqueous solution studies in the binary Cr(III)–quinato system. Polyhedron 2013. [DOI: 10.1016/j.poly.2012.08.005] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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24
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Gabriel C, Perikli M, Raptopoulou CP, Terzis A, Psycharis V, Mateescu C, Jakusch T, Kiss T, Bertmer M, Salifoglou A. pH-Specific Hydrothermal Assembly of Binary and Ternary Pb(II)-(O,N-Carboxylic Acid) Metal Organic Framework Compounds: Correlation of Aqueous Solution Speciation with Variable Dimensionality Solid-State Lattice Architecture and Spectroscopic Signatures. Inorg Chem 2012; 51:9282-96. [DOI: 10.1021/ic300850g] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- C. Gabriel
- Department of Chemical Engineering, Laboratory
of Inorganic Chemistry, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece
| | - M. Perikli
- Department of Chemical Engineering, Laboratory
of Inorganic Chemistry, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece
| | - C. P. Raptopoulou
- Institute of Materials Science, NCSR “Demokritos”, Aghia Paraskevi 15310, Attiki, Greece
| | - A. Terzis
- Institute of Materials Science, NCSR “Demokritos”, Aghia Paraskevi 15310, Attiki, Greece
| | - V. Psycharis
- Institute of Materials Science, NCSR “Demokritos”, Aghia Paraskevi 15310, Attiki, Greece
| | - C. Mateescu
- Banat’s University of Agricultural Sciences and Veterinary Medicine, Timisoara 300645,
Romania
| | - T. Jakusch
- Biocoordination
Chemistry Research Group of the Hungarian Academy of Sciences, Department
of Inorganic and Analytical Chemistry, University of Szeged, Szeged H-6720, Hungary
| | - T. Kiss
- Biocoordination
Chemistry Research Group of the Hungarian Academy of Sciences, Department
of Inorganic and Analytical Chemistry, University of Szeged, Szeged H-6720, Hungary
| | - M. Bertmer
- Institut für Experimentelle Physik II, Universität Leipzig, Leipzig 04103, Germany
| | - A. Salifoglou
- Department of Chemical Engineering, Laboratory
of Inorganic Chemistry, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece
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25
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Menelaou M, Lalioti N, Psycharis V, Raptopoulou C, Terzis A, Mateescu C, Salifoglou A. Coordination polymeric materials in binary and ternary Cu(II)–tetracarboxylato–bipy systems: Structure–reactivity correlation in Cu(II)–(O,N) 1D–3D lattice assemblies. Polyhedron 2012. [DOI: 10.1016/j.poly.2012.04.012] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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26
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Gabriel C, Kioseoglou E, Venetis J, Psycharis V, Raptopoulou CP, Terzis A, Voyiatzis G, Bertmer M, Mateescu C, Salifoglou A. pH-Specific Structural Speciation of the Ternary V(V)–Peroxido–Betaine System: A Chemical Reactivity-Structure Correlation. Inorg Chem 2012; 51:6056-69. [DOI: 10.1021/ic2025878] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- C. Gabriel
- Laboratory of Inorganic Chemistry, Department
of Chemical Engineering, Aristotle University of Thessaloniki, Thessaloniki
54124, Greece
| | - E. Kioseoglou
- Laboratory of Inorganic Chemistry, Department
of Chemical Engineering, Aristotle University of Thessaloniki, Thessaloniki
54124, Greece
| | - J. Venetis
- Laboratory of Inorganic Chemistry, Department
of Chemical Engineering, Aristotle University of Thessaloniki, Thessaloniki
54124, Greece
| | - V. Psycharis
- Institute
of Materials Science, NCSR “Demokritos”, Aghia Paraskevi,
Attiki 15310, Greece
| | - C. P. Raptopoulou
- Institute
of Materials Science, NCSR “Demokritos”, Aghia Paraskevi,
Attiki 15310, Greece
| | - A. Terzis
- Institute
of Materials Science, NCSR “Demokritos”, Aghia Paraskevi,
Attiki 15310, Greece
| | - G. Voyiatzis
- Foundation
for Research and Technology Hellas (FORTH), Institute of Chemical
Engineering and High Temperature Chemical Processes (ICE/HT), Patras
26500, Greece
| | - M. Bertmer
- Institut
für Experimentelle Physik II, Universität Leipzig, Leipzig
04103, Germany
| | - C. Mateescu
- Banat's
University of Agricultural Sciences and Veterinary Medicine, Timisoara
300645, Romania
| | - A. Salifoglou
- Laboratory of Inorganic Chemistry, Department
of Chemical Engineering, Aristotle University of Thessaloniki, Thessaloniki
54124, Greece
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27
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Kaliva M, Gabriel C, Raptopoulou CP, Terzis A, Voyiatzis G, Zervou M, Mateescu C, Salifoglou A. A Unique Dinuclear Mixed V(V) Oxo-peroxo Complex in the Structural Speciation of the Ternary V(V)-Peroxo-citrate System. Potential Mechanistic and Structural Insight into the Aqueous Synthetic Chemistry of Dinuclear V(V)-Citrate Species with H2O2. Inorg Chem 2011; 50:11423-36. [DOI: 10.1021/ic201204s] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- M. Kaliva
- Department of Chemistry, University of Crete, Heraklion 71409, Greece
| | - C. Gabriel
- Laboratory of Inorganic Chemistry, Department of Chemical Engineering, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece
| | - C. P. Raptopoulou
- Institute of Materials Science, NCSR “Demokritos”, Aghia Paraskevi 15310, Attiki, Greece
| | - A. Terzis
- Institute of Materials Science, NCSR “Demokritos”, Aghia Paraskevi 15310, Attiki, Greece
| | - G. Voyiatzis
- Foundation for Research and Technology Hellas (FORTH), Institute of Chemical Engineering and High Temperature Chemical Processes (ICE/HT), Patras 26500, Greece
| | - M. Zervou
- Laboratory of Molecular Analysis, Institute of Organic and Pharmaceutical Chemistry, National Hellenic Research Foundation, Athens 11635, Greece
| | - C. Mateescu
- Banat University of Agricultural Sciences and Veterinary Medicine, Timisoara 1900, Romania
| | - A. Salifoglou
- Laboratory of Inorganic Chemistry, Department of Chemical Engineering, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece
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Menelaou M, Daskalakis M, Mateescu A, Raptopoulou C, Terzis A, Mateescu C, Tangoulis V, Jakusch T, Kiss T, Salifoglou A. In depth investigation of the synthesis, structural, and spectroscopic characterization of a high pH binary Co(II)–N,N-bis(phosphonomethyl)glycine species. Association with aqueous speciation studies of binary Co(II)–(carboxy)phosphonate systems. Polyhedron 2011. [DOI: 10.1016/j.poly.2010.11.007] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Menelaou M, Konstantopai A, Lalioti N, Raptopoulou CP, Psycharis V, Terzis A, Mateescu C, Tsarhopoulos K, Rigas P, Salifoglou A. Hydrothermal Synthesis and Characterization of 2D M(II)-Quinate (M = Co,Zn) Metal−Organic Lattice Assemblies: Solid-State Solution Structure Correlation in M(II)-Hydroxycarboxylate Systems. Inorg Chem 2010; 49:11449-62. [DOI: 10.1021/ic1013945] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- M. Menelaou
- Department of Chemical Engineering, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece
| | - A. Konstantopai
- Department of Chemical Engineering, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece
| | - N. Lalioti
- Department of Chemistry, University of Patras, Patras 26500, Greece
| | - C. P. Raptopoulou
- Institute of Materials Science, NCSR “Demokritos”, 15310 Aghia Paraskevi, Attiki, Greece
| | - V. Psycharis
- Institute of Materials Science, NCSR “Demokritos”, 15310 Aghia Paraskevi, Attiki, Greece
| | - A. Terzis
- Institute of Materials Science, NCSR “Demokritos”, 15310 Aghia Paraskevi, Attiki, Greece
| | - C. Mateescu
- Banat University of Agricultural Sciences and Veterinary Medicine, Timisoara 300645, Romania
| | | | - P. Rigas
- Biotoxins and Analytical Chemistry Laboratory, Department of Fisheries and Aquaculture Technology, Technological Educational Institute of Thessaloniki, N. Moudania, Greece
| | - A. Salifoglou
- Department of Chemical Engineering, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece
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Georgantas V, Kotsakis N, Raptopoulou C, Terzis A, Iordanidis L, Zervou M, Jakusch T, Kiss T, Salifoglou A. Synthetic, structural and solution speciation studies on binary Al(III)–(carboxy)phosphonate systems. Relevance to the neurotoxic potential of Al(III). J Inorg Biochem 2009; 103:1530-41. [DOI: 10.1016/j.jinorgbio.2009.05.020] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2009] [Revised: 04/30/2009] [Accepted: 05/15/2009] [Indexed: 10/20/2022]
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Menelaou M, Dakanali M, Raptopoulou C, Drouza C, Lalioti N, Salifoglou A. pH-Specific synthetic chemistry, and spectroscopic, structural, electrochemical and magnetic susceptibility studies in binary Ni(II)-(carboxy)phosphonate systems. Polyhedron 2009. [DOI: 10.1016/j.poly.2009.05.084] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Menelaou M, Konstantopai A, Mateescu C, Zhao H, Drouza C, Lalioti N, Salifoglou A. pH-Dependent Syntheses, Structural and Spectroscopic Characterization, and Chemical Transformations of Aqueous Co(II)−Quinate Complexes: An Effort to Delve into the Structural Speciation of the Binary Co(II)−Quinic Acid System. Inorg Chem 2009; 48:8092-105. [DOI: 10.1021/ic801500x] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Gabriel C, Venetis J, Kaliva M, Raptopoulou C, Terzis A, Drouza C, Meier B, Voyiatzis G, Potamitis C, Salifoglou A. Probing for missing links in the binary and ternary V(V)–citrate–(H2O2) systems: Synthetic efforts and in vitro insulin mimetic activity studies. J Inorg Biochem 2009; 103:503-16. [DOI: 10.1016/j.jinorgbio.2008.12.018] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2008] [Revised: 12/21/2008] [Accepted: 12/30/2008] [Indexed: 01/19/2023]
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Menelaou M, Mateescu C, Zhao H, Rodriguez-Escudero I, Lalioti N, Sanakis Y, Simopoulos A, Salifoglou A. pH-Specific Synthetic Chemistry and Solution Studies in the Binary System of Iron(III) with the α-Hydroxycarboxylate Substrate Quinic Acid: Potential Relevance to Iron Chemistry in Plant Fluids. Inorg Chem 2009; 48:1844-56. [DOI: 10.1021/ic800356v] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Gabriel C, Kaliva M, Venetis J, Baran P, Rodriguez-Escudero I, Voyiatzis G, Zervou M, Salifoglou A. Aqueous V(V)-Peroxo-Amino Acid Chemistry. Synthesis, Structural and Spectroscopic Characterization of Unusual Ternary Dinuclear Tetraperoxo Vanadium(V)-Glycine Complexes. Inorg Chem 2008; 48:476-87. [DOI: 10.1021/ic801427b] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- C. Gabriel
- Laboratory of Inorganic Chemistry, Department of Chemical Engineering, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece, Department of Chemistry, University of Crete, Heraklion 71409, Greece, Department of Chemistry, University of Puerto Rico, San Juan, Puerto Rico 00931-3346, Foundation for Research and Technology Hellas (FORTH), Institute of Chemical Engineering and High Temperature Chemical Processes (ICE/HT), Patras 26500, Greece, and Laboratory of Molecular Analysis, Institute of
| | - M. Kaliva
- Laboratory of Inorganic Chemistry, Department of Chemical Engineering, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece, Department of Chemistry, University of Crete, Heraklion 71409, Greece, Department of Chemistry, University of Puerto Rico, San Juan, Puerto Rico 00931-3346, Foundation for Research and Technology Hellas (FORTH), Institute of Chemical Engineering and High Temperature Chemical Processes (ICE/HT), Patras 26500, Greece, and Laboratory of Molecular Analysis, Institute of
| | - J. Venetis
- Laboratory of Inorganic Chemistry, Department of Chemical Engineering, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece, Department of Chemistry, University of Crete, Heraklion 71409, Greece, Department of Chemistry, University of Puerto Rico, San Juan, Puerto Rico 00931-3346, Foundation for Research and Technology Hellas (FORTH), Institute of Chemical Engineering and High Temperature Chemical Processes (ICE/HT), Patras 26500, Greece, and Laboratory of Molecular Analysis, Institute of
| | - P. Baran
- Laboratory of Inorganic Chemistry, Department of Chemical Engineering, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece, Department of Chemistry, University of Crete, Heraklion 71409, Greece, Department of Chemistry, University of Puerto Rico, San Juan, Puerto Rico 00931-3346, Foundation for Research and Technology Hellas (FORTH), Institute of Chemical Engineering and High Temperature Chemical Processes (ICE/HT), Patras 26500, Greece, and Laboratory of Molecular Analysis, Institute of
| | - I. Rodriguez-Escudero
- Laboratory of Inorganic Chemistry, Department of Chemical Engineering, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece, Department of Chemistry, University of Crete, Heraklion 71409, Greece, Department of Chemistry, University of Puerto Rico, San Juan, Puerto Rico 00931-3346, Foundation for Research and Technology Hellas (FORTH), Institute of Chemical Engineering and High Temperature Chemical Processes (ICE/HT), Patras 26500, Greece, and Laboratory of Molecular Analysis, Institute of
| | - G. Voyiatzis
- Laboratory of Inorganic Chemistry, Department of Chemical Engineering, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece, Department of Chemistry, University of Crete, Heraklion 71409, Greece, Department of Chemistry, University of Puerto Rico, San Juan, Puerto Rico 00931-3346, Foundation for Research and Technology Hellas (FORTH), Institute of Chemical Engineering and High Temperature Chemical Processes (ICE/HT), Patras 26500, Greece, and Laboratory of Molecular Analysis, Institute of
| | - M. Zervou
- Laboratory of Inorganic Chemistry, Department of Chemical Engineering, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece, Department of Chemistry, University of Crete, Heraklion 71409, Greece, Department of Chemistry, University of Puerto Rico, San Juan, Puerto Rico 00931-3346, Foundation for Research and Technology Hellas (FORTH), Institute of Chemical Engineering and High Temperature Chemical Processes (ICE/HT), Patras 26500, Greece, and Laboratory of Molecular Analysis, Institute of
| | - A. Salifoglou
- Laboratory of Inorganic Chemistry, Department of Chemical Engineering, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece, Department of Chemistry, University of Crete, Heraklion 71409, Greece, Department of Chemistry, University of Puerto Rico, San Juan, Puerto Rico 00931-3346, Foundation for Research and Technology Hellas (FORTH), Institute of Chemical Engineering and High Temperature Chemical Processes (ICE/HT), Patras 26500, Greece, and Laboratory of Molecular Analysis, Institute of
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Gabriel C, Raptopoulou CP, Terzis A, Tangoulis V, Mateescu C, Salifoglou A. pH-Specific Synthesis and Spectroscopic, Structural, and Magnetic Studies of a Chromium(III)−Citrate Species. Aqueous Solution Speciation of the Binary Chromium(III)−Citrate System. Inorg Chem 2007; 46:2998-3009. [PMID: 17378548 DOI: 10.1021/ic061480j] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
In an attempt to understand the aqueous interactions of Cr(III) with the low-molecular-mass physiological ligand citric acid, the pH-specific synthesis in the binary Cr(III)-citrate system was explored, leading to the complex (NH4)4[Cr(C6H4O7)(C6H5O7)].3H2O (1). 1 crystallizes in the monoclinic space group I2/a, with a = 19.260(10) A, b = 10.006(6) A, c = 23.400(10) A, beta = 100.73(2) degrees , V = 4431(4) A3, and Z = 8. 1 was characterized by elemental analysis and spectroscopic, structural, thermal, and magnetic susceptibility studies. Detailed aqueous speciation studies in the Cr(III)-citrate system suggest the presence of a number of species, among which is the mononuclear [Cr(C6H4O7)(C6H5O7)]4- complex, optimally present around pH approximately 5.5. The structure of 1 reveals a mononuclear octahedral complex of Cr(III) with two citrate ligands bound to it. The two citrate ligands have different deprotonation states, thus signifying the importance of the mixed deprotonation state in the coordination sphere of the Cr(III) species in aqueous speciation. The latter reveals the distribution of numerous species, including 1, for which the collective structural, spectroscopic, and magnetic data point out its physicochemical profile in the solid state and in solution. The importance of the synthetic efforts linked to 1 and the potential ramifications of Cr(III) reactivity toward both low- and high-molecular-mass biotargets are discussed in light of (a) the quest for well-characterized soluble Cr(III) species that could be detected and identified in biologically relevant fluids, (b) ongoing efforts to delineate the aqueous speciation of the Cr(III)-citrate system and its link to biotoxic Cr(III) manifestations, and (c) the synthetic utility of convenient Cr(III) precursors in the synthesis of advanced materials.
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Affiliation(s)
- C Gabriel
- Department of Chemical Engineering, Laboratory of Inorganic Chemistry, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece
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Kaliva M, Kyriakakis E, Gabriel C, Raptopoulou C, Terzis A, Tuchagues JP, Salifoglou A. Synthesis, isolation, spectroscopic and structural characterization of a new pH complex structural variant from the aqueous vanadium(V)-peroxo-citrate ternary system. Inorganica Chim Acta 2006. [DOI: 10.1016/j.ica.2006.07.011] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Aureliano M, Tiago T, Gândara RMC, Sousa A, Moderno A, Kaliva M, Salifoglou A, Duarte RO, Moura JJG. Interactions of vanadium(V)-citrate complexes with the sarcoplasmic reticulum calcium pump. J Inorg Biochem 2005; 99:2355-61. [PMID: 16219359 DOI: 10.1016/j.jinorgbio.2005.09.002] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.3] [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: 07/05/2005] [Revised: 09/05/2005] [Accepted: 09/07/2005] [Indexed: 02/07/2023]
Abstract
Among the biotargets interacting with vanadium is the calcium pump from the sarcoplasmic reticulum (SR). To this end, initial research efforts were launched with two vanadium(V)-citrate complexes, namely (NH(4))(6)[V(2)O(4)(C(6)H(4)O(7))(2)].6H(2)O and (NH(4))(6)[V(2)O(2)(O(2))(2)(C(6)H(4)O(7))(2)].4H(2)O, potentially capable of interacting with the SR calcium pump by combining kinetic studies with (51)V NMR spectroscopy. Upon dissolution in the reaction medium (concentration range: 4-0.5mM), both vanadium(V):citrate (VC) and peroxovanadium(V):citrate (PVC) complexes are partially converted into vanadate oligomers. A 1mM solution of the PVC complex, containing 184microM of the PVC complex, 94microM oxoperoxovanadium(V) (PV) species, 222microM monomeric (V1), 43microM dimeric (V2) and 53microM tetrameric (V4) species, inhibits Ca(2+) accumulation by 75 %, whereas a solution of the VC complex of the same vanadium concentration, containing 98microM of the VC complex, 263microM monomeric (V1), 64microM dimeric (V2) and 92microM tetrameric (V4) species inhibits the calcium pump activity by 33 %. In contrast, a 1 mM metavanadate solution, containing 460microM monomeric (V1), 90.2microM dimeric (V2) and 80microM tetrameric (V4) species, has no effect on Ca(2+) accumulation. The NMR signals from the VC complex (-548.0ppm), PVC complex (-551.5ppm) and PV (-611.1ppm) are broadened upon SR vesicle addition (2.5mg/ml total protein). The relative order for the half width line broadening of the NMR signals, which reflect the interaction with the protein, was found to be V4>PVC>VC>PV>V2=V1=1, with no effect observed for the V1 and V2 signals. Putting it all together the effects of two vanadium(V)-citrate complexes on the modulation of calcium accumulation and ATP hydrolysis by the SR calcium pump reflected the observed variable reactivity into the nature of key species forming upon dissolution of the title complexes in the reaction media.
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Affiliation(s)
- Manuel Aureliano
- CBME, Department of Chemistry and Biochemistry, FCT, University of the Algarve, 8005-139 Faro, Portugal.
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Kefalas ET, Dakanali M, Panagiotidis P, Raptopoulou CP, Terzis A, Mavromoustakos T, Kyrikou I, Karligiano N, Bino A, Salifoglou A. pH-Specific Aqueous Synthetic Chemistry in the Binary Cadmium(II)−Citrate System. Gaining Insight into Cadmium(II)−Citrate Speciation with Relevance to Cadmium Toxicity. Inorg Chem 2005; 44:4818-28. [PMID: 15962990 DOI: 10.1021/ic050286e] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The involvement of Cd(II) in toxic manifestations and pathological aberrations in lower and higher organisms entails interactions with low and high molecular mass biological targets. To understand the relevant chemistry in aqueous media, we have launched pH-dependent synthetic efforts targeting Cd(II) with the physiological ligand citric acid. Reactions of Cd(II) with citric acid upon the addition of NaOH at pH 2.5 and pyridine at pH 3 and the addition of ammonia at pH approximately 7 led to the new complexes [Cd3(C6H5O7)2(H2O)5] x H2O (1) and (NH4)[Cd(C6H5O7)(H2O)] x H2O (2), respectively. Complexes 1 and 2 were characterized by elemental analysis, spectroscopy (FT-IR and NMR), and X-ray crystallography. Complex 1 crystallizes in the monoclinic space group P2(1)/n, with a = 18.035(6) A, b = 10.279(4) A, c = 12.565(4) A, beta = 109.02(1) degrees, V = 2202(2) A3, and Z = 4. Complex 2 crystallizes in the monoclinic space group P2(1), with a = 9.686(4) A, b = 8.484(4) A, c = 7.035(3) A, beta = 110.28(1) degrees, V = 542.3(4) A3, and Z = 2. Complex 1 is a trinuclear assembly with the citrate ligand securing a stable metallacyclic ring around one Cd(II), with the terminal carboxylates spanning into the coordination sphere of two nearby Cd(II) ions. Complex 2 contains mononuclear units of Cd(II) bound by citrate in an overall coordination number of 8. In both 1 and 2, the participating citrates exhibit three different modes of coordination, thus projecting a distinct yet variable aqueous structural chemistry of Cd(II) with physiological substrates. The pH-dependent chemistry and its apparent structural diversity validate past solution speciation studies, projecting the existence of mononuclear species such as the one in the anion of 2. The spectroscopic and structural properties of 2 emphasize the significance of the information emerging from synthetic studies that otherwise would not have been revealed through conventional solution studies, while concurrently shedding light onto the linkage of the requisite chemistry with the potential biological toxicity of Cd(II).
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Affiliation(s)
- E T Kefalas
- Department of Chemistry, University of Crete, Heraklion 71409, Greece
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Kefalas ET, Panagiotidis P, Raptopoulou CP, Terzis A, Mavromoustakos T, Salifoglou A. Mononuclear Titanium(IV)−Citrate Complexes from Aqueous Solutions: pH-Specific Synthesis and Structural and Spectroscopic Studies in Relevance to Aqueous Titanium(IV)−Citrate Speciation. Inorg Chem 2005; 44:2596-605. [PMID: 15819544 DOI: 10.1021/ic049276o] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Titanium is a metal frequently employed in a plethora of materials supporting medical applications. In an effort to comprehend the involvement of titanium in requisite biological interactions with physiological ligands, synthetic efforts were launched targeting aqueous soluble species of Ti(IV). To this end, aqueous reactions of TiCl(4) with citric acid afforded expediently, under pH-specific conditions, the colorless crystalline materials Na(6)[Ti(C(6)H(4.5)O(7))(2)(C(6)H(5)O(7))].16H(2)O (1) and Na(3)(NH(4))(3)[Ti(C(6)H(4.5)O(7))(2)(C(6)H(5)O(7))].9H(2)O (2). Complexes 1 and 2 were characterized by elemental analysis, FT-IR, (13)C-MAS solid state and solution NMR, cyclic voltammetry, and X-ray crystallography. 1 crystallizes in the triclinic space group P, with a = 15.511(9) A, b = 15.58(1) A, c = 9.848(5) A, alpha = 85.35(2) degrees, beta = 76.53(2) degrees, gamma = 61.97(2) degrees, V = 2042(2) A(3), and Z = 2. 2 crystallizes in the triclinic space group P, with a = 12.437(5) A, b = 12.440(5) A, c = 12.041(5) A, alpha = 83.08(2) degrees, beta = 81.43(2) degrees, gamma = 67.45(2) degrees, V = 1697(2) A(3), and Z = 2. The X-ray structures of 1 and 2 reveal the presence of a mononuclear complex, with Ti(IV) coordinated to three citrate ligands in a distorted octahedral geometry around Ti(IV). The citrates employ their central alkoxide and carboxylate groups to bind Ti(V), while the terminal carboxylates stay away from the Ti(IV)O(6) core. Worth noting in 1 and 2 is the similar mode of coordination but variable degree of protonation of the bound citrates, with the locus of (de)protonation being the noncoordinating terminal carboxylates. As a result, this work suggests the presence of a number of different Ti(IV)-citrate species of the same nuclearity and coordination geometry as a function of pH. This is consistent with the so far existing pool of mononuclear Ti(IV)-citrate species and provides a logical account of the aqueous speciation in the requisite binary system. Such information is vital in trying to delineate the interactions of soluble and bioavailable Ti(IV) forms promoting biological interactions in humans. To this end, chemical properties, structural attributes, and speciation links to potential ensuing biological effects are dwelled on.
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Affiliation(s)
- E T Kefalas
- Department of Chemistry, University of Crete, Heraklion 71409, Greece
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Kaliva M, Raptopoulou CP, Terzis A, Salifoglou A. pH-Specific Synthesis of a Dinuclear Vanadium(V)−Peroxo−Citrate Complex in Aqueous Solutions: pH-Dependent Linkage, Spectroscopic and Structural Correlations with Other Aqueous Vanadium(V)−Peroxo−Citrate and Non-Peroxo Species. Inorg Chem 2004; 43:2895-905. [PMID: 15106977 DOI: 10.1021/ic034283i] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Aqueous reactions of V2O5 or VCl3 in the presence of the physiological citric acid and hydrogen peroxide, in a pH specific fashion, afforded a new vanadium(V)-peroxo-citrate material isolated in a pure crystalline form. Elemental analysis pointed to the molecular formulation (NH4)6[V(V)2O2(O2)2(C6H4O7)2].4.5H2O (1). Complex 1 was further characterized by UV-vis, FT-IR, and X-ray crystallography. Compound 1 crystallizes in the monoclinic space group C2/c with a = 12.391(5) A, b = 15.737(7) A, c = 17.102(7) A, beta = 110.84(1) degrees, V = 3117(1) A3, and Z = 4. The structure of the anionic assembly consists of a planar V(V)2O2 core with two fully deprotonated citrates bound to it through the central carboxylate and alkoxide moieties as well as one of the terminal carboxylate groups. The presence of one peroxide group attached to each vanadium(V) renders the geometry around each metal center pentagonal bipyramidal. Key structural and spectroscopic features of 1 correlate with those seen in the peroxo congener and low-pH analogue (NH4)2[V(V)2O2(O2)2(C6H6O7)2].2H2O (3), in which all terminal carboxylate groups are protonated. In solution, simple pH-dependent transformation of 1 to 3 attests to their participation in the requisite speciation and potentiates the presence of other similar peroxo analogues not yet isolated and characterized. The reactivity of 1 through transformation reactions, yielding a plethora of well-characterized species, establishes a linkage among various species with the same or different vanadium oxidation states. Collectively, the data reflect soluble forms of vanadium with peroxide and citrate that contribute to the requisite pH-dependent distribution of that metal ion and likely influence biological processes.
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Affiliation(s)
- M Kaliva
- Department of Chemistry, University of Crete, Heraklion 71409, Greece
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Dakanali M, Kefalas ET, Raptopoulou CP, Terzis A, Voyiatzis G, Kyrikou I, Mavromoustakos T, Salifoglou A. A new dinuclear Ti(IV)-peroxo-citrate complex from aqueous solutions. Synthetic, structural, and spectroscopic studies in relevance to aqueous titanium(IV)-peroxo-citrate speciation. Inorg Chem 2003; 42:4632-9. [PMID: 12870954 DOI: 10.1021/ic0343051] [Citation(s) in RCA: 71] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The wide use of titanium in applied materials has prompted pertinent studies targeting the requisite chemistry of that metal's biological interactions. In order to understand such interactions as well as the requisite titanium aqueous speciation, we launched investigations on the synthesis and spectroscopic and structural characterization of Ti(IV) species with the physiological citric acid. Aqueous reactions of TiCl(4) with citric acid in the presence of H(2)O(2) and neutralizing ammonia afforded expediently the red crystalline material (NH(4))(4)[Ti(2)(O(2))(2)(C(6)H(4)O(7))(2)].2H(2)O (1). Complex 1 was further characterized by UV-vis, FT-IR, FT- and laser-Raman, NMR, and finally by X-ray crystallography. Compound 1 crystallizes in the monoclinic space group P2(1)/n, with a = 10.360(4) A, b = 10.226(4) A, c = 11.478(6) A, beta = 107.99(2) degrees, V = 1156.6(9) A(3), and Z = 2. The X-ray structure of 1 reveals a dinuclear anionic complex containing a Ti(IV)(2)O(2) core. In that central unit, two fully deprotonated citrate ligands are coordinated to the metal ions through their carboxylate moieties in a monodentate fashion. The central alkoxides serve as bridges to the two titanium ions. Also attached to the Ti(IV)(2)O(2) core are two peroxo ligands each bound in a side-on fashion to the respective metal ions. NH(4)(+) ions neutralize the 4- charge of the anion in 1, further contributing to the stability of the derived lattice through H-bond formation. The structural similarities and differences with congener vanadium(V)-peroxo-citrate complexes may point out potential implications in the chemistry of titanium with physiological ligands, when the former is present in a biologically relevant medium.
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Affiliation(s)
- M Dakanali
- Department of Chemistry, University of Crete, Heraklion 71409, Greece
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Dakanali M, Kefalas ET, Raptopoulou CP, Terzis A, Mavromoustakos T, Salifoglou A. Synthesis and spectroscopic and structural studies of a new cadmium(II)-citrate aqueous complex. Potential relevance to cadmium(II)-citrate speciation and links to cadmium toxicity. Inorg Chem 2003; 42:2531-7. [PMID: 12691558 DOI: 10.1021/ic0205029] [Citation(s) in RCA: 67] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The presence of cadmium in the environment undoubtedly contributes to an increased risk of exposure and ultimate toxic influence on humans. In an effort to comprehend the chemical and biological interactions of Cd(II) with physiological ligands, like citric acid, we explored the requisite aqueous chemistry, which afforded the first aqueous Cd(II)-citrate complex [Cd(C(6)H(6)O(7))(H(2)O)](n)() (1). Compound 1 was characterized by elemental analysis, and spectroscopically by FT-IR and (113)Cd MAS NMR. Compound 1 crystallizes in the orthorhombic space group P2(1)2(1)2(1), with a = 6.166(2) A, b = 10.508(3) A, c = 13.599(5) A, V = 881.2(5) A(3), and Z = 4. The X-ray structure of 1 reveals the presence of octahedral Cd(II) ions bound to citrate ligands in a molecular crystal lattice. Citrate acts as a tridentate binder promoting coordination to one Cd(II) through the central alcoholic moiety, one terminal carboxylate group, and the central carboxylate group. In addition, the central carboxylate binds to three Cd(II) ions. Specifically, one of the oxygens of the central carboxylate serves as a bridge to two neighboring Cd(II) ions, while the other oxygen binds to a third Cd(II). A bound water molecule completes the coordination requirements of Cd(II). (113)Cd MAS NMR studies project the spectroscopic signature of the nature of the coordination environment around Cd(II) in 1, thus corroborating the X-ray findings. Collectively, the data at hand are in line with past solution studies. The latter predict that other similar low molecular mass Cd(II)-citrate complexes may exist in the acidic pH region, thus influencing the uptake of cadmium by living (micro)organisms, their ability to metabolize organic substrates, and possibly Cd(II) toxicity.
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Affiliation(s)
- M Dakanali
- Department of Chemistry, University of Crete, Heraklion 71409, Greece
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Kaliva M, Raptopoulou CP, Terzis A, Salifoglou A. Systematic studies on pH-dependent transformations of dinuclear vanadium(V)-citrate complexes in aqueous solutions. A perspective relevance to aqueous vanadium(V)-citrate speciation. J Inorg Biochem 2003; 93:161-73. [PMID: 12576278 DOI: 10.1016/s0162-0134(02)00563-9] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Vanadium(V) involvement in interactions with physiological ligands in biological media prompted us to delve into the systematic pH-dependent synthesis, spectroscopic characterization, and perusal of chemical properties of arising aqueous vanadium(V)-citrate species in the requisite system. To this end, facile reactions led to dinuclear complexes (NH(4))(4)[V(2)O(4)(C(6)H(5)O(7))(2)].4H(2)O (1) and (NH(4))(6)[V(2)O(4)(C(6)H(4)O(7))(2)].6H(2)O (2). Complex 1 and 2 were characterized by elemental analysis, FT-IR and X-ray crystallography. Complex 1 crystallizes in the monoclinic space group C2/c with a=16.998(5) A, b=16.768(5) A, c=9.546(3) A, beta=105.22(1) degrees, V=2625(1) A(3), and Z=4. Complex 2 crystallizes in the triclinic space group P1;, with a=9.795(4) A, b=9.942(4) A, c=9.126(3) A, alpha=90.32(1) degrees, beta=111.69(1) degrees, gamma=108.67(1) degrees, V=774.5(5) A(3), and Z=1. The structures of 1 and 2 were consistent with the presence of a V(V)(2)O(2) core, to which citrate ligands of differing protonation state were bound in a coordination mode consistent with past observations. Ultimately, the aqueous pH dependent transformations of a series of three dinuclear complexes, 1, 2 and (NH(4))(2)[V(2)O(4)(C(6)H(6)O(7))(2)].2H(2)O (3), all isolated at pH values from 3 to 7.5, were explored and revealed an important interconnection among all species. Collectively, pH emerged as a determining factor of structural attributes in all three complexes, with the adjoining acid-base chemistry unfolding around the stable V(V)(2)O(2) core. The results point to the participation of all three species in aqueous vanadium(V)-citrate speciation, and may relate the site-specific protonations-deprotonations on the dinuclear complexes to potential biological processes involving vanadium(V) and physiological ligand targets.
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Affiliation(s)
- M Kaliva
- Department of Chemistry, University of Crete, 71409 Heraklion, Greece
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Kotsakis N, Raptopoulou CP, Tangoulis V, Terzis A, Giapintzakis J, Jakusch T, Kiss T, Salifoglou A. Correlations of synthetic, spectroscopic, structural, and speciation studies in the biologically relevant cobalt(II)-citrate system: the tale of the first aqueous dinuclear cobalt(II)-citrate complex. Inorg Chem 2003; 42:22-31. [PMID: 12513074 DOI: 10.1021/ic011272l] [Citation(s) in RCA: 80] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Synthetic efforts targeting soluble species of Co(II) with the low molecular mass physiological ligand citric acid led to the isolation of the first dinuclear complex [Co(2)(C(6)H(5)O(7))(2)(H(2)O)(4)](2-), at pH approximately 5, in the form of its K+ (1) and Na+ (2) salts. Both 1 and 2 were characterized analytically, spectroscopically (FT-IR, UV/visible, EPR), and magnetically. Complex 1 crystallizes in the monoclinic space group P2(1)/n, with a = 10.348(5) A, b = 11.578(6) A, c = 12.138(6) A, beta = 112.62(2) degrees, V = 1342(1) A(3), and Z = 2. Complex 2 crystallizes in the monoclinic space group P2(1)/c, with a = 9.234(4) A, b = 11.913(4) A, c = 11.728(6) A, beta = 99.93(2) degrees, V = 1271(1) A(3), and Z = 2. X-ray crystallography on 1 and 2 reveals the presence of two Co(II) ions, in a dinuclear assembly, octahedrally coordinated by two citrate ligands in a tridentate fashion. The octahedral environment around each Co(II) is complemented by another singly bonded citrate belonging to the adjacent Co(II) unit and two water molecules. Magnetic susceptibility and EPR studies on 1, in the solid state, corroborate the X-ray results, indicating a weak interaction between the two Co(II) ions. Moreover, EPR and UV/visible studies in solution suggest that 1 does not retain its dimeric structure, yielding a mononuclear octahedral Co(II)-citrate species. Detailed speciation studies suggest the presence of a number of species including the mononuclear complex [Co(C(6)H(5)O(7))](-), optimally present around pH approximately 5. In consonance with EPR and UV/visible spectroscopy, [Co(C(6)H(5)O(7))](-) is likely the scaffolding unit on the basis of which the dimer [Co(2)(C(6)H(5)O(7))(2)(H(2)O)(4)](2-) is isolated from aqueous solutions. Collectively, this comprehensive study offers significant structural insight into the Co(II)-citrate speciation and the elucidation of the role of Co(II) in biological fluids.
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Affiliation(s)
- N Kotsakis
- Department of Chemistry, University of Crete, Heraklion 71409, Greece
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Kaliva M, Kyriakakis E, Salifoglou A. Reactivity investigation of dinuclear vanadium(IV,V)-citrate complexes in aqueous solutions. A closer look into aqueous vanadium-citrate interconversions. Inorg Chem 2002; 41:7015-23. [PMID: 12495339 DOI: 10.1021/ic020323r] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Well-known vanadium(IV)- and vanadium(V)-citrate complexes have been employed in transformations involving vanadium redox as well as nonredox processes. The employed complexes include K(2)[V(2)O(4)(C(6)H(6)O(7))(2)] x 4H(2)O, K(4)[V(2)O(4)(C(6)H(5)O(7))(2)] x 5.6H(2)O, K(2)[V(2)O(2)(O(2))(2)(C(6)H(6)O(7))(2)] x 2H(2)O, K(4)[V(2)O(2)(C(6)H(4)O(7))(2)] x 6H(2)O, K(3)[V(2)O(2)(C(6)H(4)O(7))(C(6)H(5)O(7))] x 7H(2)O, (NH(4))(4)[V(2)O(2)(C(6)H(4)O(7))(2)] x 2H(2)O, and (NH(4))(6)[V(2)O(4)(C(6)H(4)O(7))(2)] x 6H(2)O. Reactions toward hydrogen peroxide at different vanadium(IV,V):H(2)O(2) ratios were crucial in delineating the routes leading to the interconversion of the various species. Equally important thermal transformations were critical in showing the linkage between pairs of dinuclear vanadium-citrate peroxo as well as nonperoxo complexes, for which the important vanadium(V)-assisted oxidative decarboxylation, leading to reduction of vanadium(V) to vanadium(IV), seemed to be a plausible pathway in place for all the cases examined. FT-IR spectroscopy and X-ray crystallography were instrumental in the identification of the arising products of all investigated reactions. Collectively, the data support the existence of chemical links between different and various structural forms of dinuclear vanadium(IV,V)-citrate complexes in aqueous media. Furthermore, in corroboration of past studies, the examined interconversions lend credence to the notion that the involved species are active participants in the respective aqueous distributions of the metal ion in the presence of the physiological ligand citrate. The concomitant significance of structure-specific species relating to soluble and potentially bioavailable forms of vanadium is mentioned.
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Affiliation(s)
- M Kaliva
- Department of Chemistry, University of Crete, Heraklion 71409, Greece
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Kaliva M, Giannadaki T, Salifoglou A, Raptopoulou CP, Terzis A. A new dinuclear vanadium(V)-citrate complex from aqueous solutions. Synthetic, structural, spectroscopic, and pH-dependent studies in relevance to aqueous vanadium(V)-citrate speciation. Inorg Chem 2002; 41:3850-8. [PMID: 12132908 DOI: 10.1021/ic010971v] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Vanadium interactions with low molecular mass binders in biological fluids entail the existence of vanadium species with variable chemical and biological properties. In the course of efforts to elucidate the chemistry related to such interactions, we have explored the oxidative chemistry of vanadium(III) with the physiologically relevant tricarboxylic citric acid. Aqueous reactions involving VCl(3) and anhydrous citric acid, at pH approximately 7, resulted in blue solutions. Investigation into the nature of the species arising in those solutions revealed, through UV/visible and EPR spectroscopies, oxidation of vanadium(III) to vanadium(IV). Further addition of H(2)O(2) resulted in the oxidation of vanadium(IV) to vanadium(V), and the isolation of a new vanadium(V)-citrate complex in the form of its potassium salt. Analogous reactions with K(4)[V(2)O(2)(C(6)H(4)O(7))(2)].6H(2)O and H(2)O(2) or V(2)O(5) and citrate at pH approximately 5.5 afforded the same material. Elemental analysis pointed to the molecular formulation K(4)[V(2)O(4)(C(6)H(5)O(7))(2)].5.6H(2)O (1). Complex 1 was further characterized by FT-IR and X-ray crystallography. 1 crystallizes in the triclinic space group P(-)1, with a = 11.093(4) A, b = 9.186(3) A, c = 15.503(5) A, alpha = 78.60(1) degrees, beta = 86.16(1) degrees, gamma = 69.87(1) degrees, V = 1454.0(8) A(3), and Z = 2. The X-ray structure of 1 reveals the presence of a dinuclear vanadium(V)-citrate complex containing a V(V)(2)O(2) core. The citrate ligands are triply deprotonated, and as such they bind to vanadium(V) ions, thus generating a distorted trigonal bipyramidal geometry. Binding occurs through the central alkoxide and carboxylate groups, with the remaining two terminal carboxylates being uncoordinated. One of those carboxylates is protonated and contributes to hydrogen bond formation with the deprotonated terminal carboxylate of an adjacent molecule. Therefore, an extended network of hydrogen-bonded V(V)(2)O(2)-core-containing dimers is created in the lattice of 1. pH-dependent transformations of 1 in aqueous media suggest its involvement in a web of vanadium(V)-citrate dinuclear species, consistent with past solution speciation studies investigating biologically relevant forms of vanadium.
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Affiliation(s)
- M Kaliva
- Department of Chemistry, University of Crete, Heraklion 71409, Greece
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Jankovics H, Daskalakis M, Raptopoulou CP, Terzis A, Tangoulis V, Giapintzakis J, Kiss T, Salifoglou A. Synthesis and structural and spectroscopic characterization of a complex between Co(II) and imino-bis(methylphosphonic acid): gaining insight into biologically relevant metal-ion phosphonate interactions or looking at a new Co(II)-organophosphonate material? Inorg Chem 2002; 41:3366-74. [PMID: 12079454 DOI: 10.1021/ic011033y] [Citation(s) in RCA: 70] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Cobalt is an essential metal ion involved in key biomolecules, regulating processes in human physiology. As a metal ion, Co(II) assumes forms, which are dictated by the nature of organic binders in biological fluids, and the conditions under which metal ion ligand interactions arise. Among the various low molecular mass metal ion binders in biological fluids are amino acids, organic acids, as well as their variably phosphorylated forms. As a representative metal ion binder, the organophosphonate ligand H(2)O(3)P-CH(2)-NH(2)(+)-CH(2)-PO(3)H(-) was employed in aqueous reactions with Co(II), ultimately leading to the isolation of complex [Co(C(2)H(8)O(6)NP(2))(2)(H(2)O)(2)] (1) at pH 2. The complex was characterized analytically, spectroscopically (FTIR, UV-vis, EPR), and magnetically. Compound 1 crystallizes in the monoclinic space group P2(1)/n, with a = 7.361(3) A, b = 8.133(3) A, c = 14.078(5) A, beta = 104.40(1) degrees, V = 816.3(5) A(3), and Z = 2. X-ray crystallography reveals that 1 is a compound with a molecular type of lattice. In it, there exist mononuclear octahedral sites of Co(II) surrounded by oxygens, belonging to terminal phosphonates and bound water molecules. Both ends of the ligand zwitterionic form are involved in binding to adjacent Co(II) ions, thus creating tetranuclear 32-membered rings, with cavities extending in two dimensions and holes in the third dimension throughout the lattice of 1. Similar structural features were observed in other metal organophosphonate lattices of potential catalytic and chemical reactivity. The magnetic and EPR data on 1 support the presence of a high-spin octahedral Co(II) in an oxygen environment, having a ground state with an effective spin S = (1)/(2). The solution UV-vis and EPR data suggest retention of the high-spin octahedral Co(II) ion, consistent with the magnetization measurements on 1. Collectively, the data reflect the existence of a soluble Co(II)-iminodiphosphonate species not unlike those expected in biological fluids containing the specific ligand or ligands similar to that. Both biologically relevant perspectives and a synthetic outlook into Co(II)-organophosphonate materials are discussed.
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Affiliation(s)
- H Jankovics
- Department of Chemistry, University of Crete, Heraklion 71409, Greece
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Coucouvanis D, Salifoglou A, Kanatzidis MG, Dunham WR, Simopoulos A, Kostikas A. Synthesis, structural characterization, and electronic properties of the [(Fe6S6X6)(M(CO)3)2]n- anions (M = Mo, W; n = 3, 4; X = Cl, Br, I). Heteronuclear clusters of possible structural relevance to the iron-molybdenum-sulfur center in nitrogenase. Inorg Chem 2002. [DOI: 10.1021/ic00295a034] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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