scholarly journals Synthesis and Characterization of Benzoic Acid Complexes with Biologically Active Metal Ions

2005 ◽  
Vol 4 (1) ◽  
pp. 85-89
Author(s):  
M. S. Selvakumar ◽  
S. R. Bheeter
Keyword(s):  
Benzoic Acid ◽  
Metal Ions ◽  
Carboxylic Acids ◽  
Acid Group ◽  
Carbonyl Oxygen ◽  
Biologically Active ◽  
Neutral Medium ◽  
Nickel Copper ◽  
Active Metal ◽  
Metabolic Reactions

Animal and plants contain carboxylic acids, which are involved in their metabolic reactions. It is also well known that metal ions are involved in their metabolic reactions. So far the complexation of carboxylate ions with metal ions has been extensively studied. Since neutral or acidic medium is existing in most of the biological reactions in animals and plants it is interested to study the complexation of organic carboxylic acids in neutral medium with biologically active metal ions such as manganese, cobalt, nickel, copper and zinc. Complexes of benzoic acid were prepared in neutral medium and were characterised. In such complexes the carboxylic acid group is not ionised and carbonyl oxygen of the carboxylic acids are coordinated to the metal ions. However the microbial study is not the scope of this work.

scholarly journals Synthesis and Characterization of Phthalic Acid Complexes with Biologically Active Metal Ions

2003 ◽  
Vol 1 (2) ◽  
pp. 7-11
Author(s):  
S. Peter ◽  
M. S. Selvakumar
Keyword(s):  
Metal Ions ◽  
Carboxylic Acids ◽  
Phthalic Acid ◽  
Acid Group ◽  
Biologically Active ◽  
Neutral Medium ◽  
Cobalt Nickel ◽  
Nickel Copper ◽  
Active Metal ◽  
Metabolic Reactions

Animal and plants contain carboxylic acids, which are involved in their metabolic reactions. It is also well known that metal ions are involved in their metabolic reactions. So far the complexation of carboxylate ions with metal ions has been extensively studied. Since neutral or acidic medium is existing in most of the biological reactions in animals and plants it is interesting to study the complexation of organic carboxylic acids in neutral medium with biologically active metal ions such as manganese, cobalt, nickel, copper and zinc. Complexes of phthalic acid were prepared in neutral medium and were characterized. In such complexes the carboxylic acid group is not ionised and carbonyloxygen of the carboxylic acids are coordinated to the metal ions. However the microbial study is not the scope of this work.

Core-shell based nanocarriers as delivery systems for biologically active metal ions and drugs

2008 ◽  
Vol 132 (3) ◽  
pp. e32-e33 ◽  
Author(s):  
M.A. Quadir ◽  
C. Treiber ◽  
G. Multhaup ◽  
M. Körner ◽  
R. Haag
Keyword(s):  
Metal Ions ◽  
Delivery Systems ◽  
Biologically Active ◽  
Core Shell ◽  
Active Metal

scholarly journals DNA interaction with biologically active metal ions. Cooperativity of metal ion binding at compacting of DNA.

1998 ◽  
Vol 45 (1) ◽  
pp. 107-117 ◽  
Author(s):  
S Kornilova ◽  
E Hackl ◽  
L Kapinos ◽  
V Andrushchenko ◽  
Y Blagoi
Keyword(s):  
Metal Ions ◽  
Metal Ion ◽  
Binding Constants ◽  
Dna Interaction ◽  
Biologically Active ◽  
Ion Binding ◽  
Metal Ion Binding ◽  
Binding Isotherms ◽  
Active Metal ◽  
Free Metal

The interaction of Cu2+, Mn2+ and Ca2+ ions with DNA in aqueous and water-ethanol solutions at different metal ion concentrations was studied by IR-spectroscopy. At sufficiently high DNA concentrations, DNA interaction with Cu2+, Ca2+ and Mn2+ ions results in compacting of DNA in the aqueous solutions. This process shows a very high cooperativity. In the presence of alcohol, DNA condensation takes place at much lower concentrations of metal ions used than in pure aqueous solution. Binding constants and cooperativity of the metal ion binding rise, and the non-monotonous dependencies of the binding degree, r, on the concentration of free metal ions, Cf, become pronounced. Binding isotherms take the S-like form similar to van der Waals isotherms for phase transitions of the liquid-vapour type. Cu2+ and Ca2+ ion binding to DNA in water-ethanol solutions also results in compacting of DNA macromolecule. The process is characterised by a high positive cooperativity and has a phase transition character.

scholarly journals Anodic Stripping Voltammetry with the Hanging Mercury Drop Electrode for Trace Metal Detection in Soil Samples

Chemosensors ◽  
2021 ◽  
Vol 9 (5) ◽  
pp. 107
Author(s):  
Kequan Xu ◽  
Clara Pérez-Ràfols ◽  
Amine Marchoud ◽  
María Cuartero ◽  
Gastón A. Crespo
Keyword(s):  
Metal Ions ◽  
Limit Of Detection ◽  
Anodic Stripping Voltammetry ◽  
Stripping Voltammetry ◽  
Hanging Mercury Drop Electrode ◽  
Mercury Drop Electrode ◽  
Redox Active ◽  
Active Metal ◽  
Metal Detection ◽  
Trace Metal Detection

The widely spread use of the hanging mercury drop electrode (HMDE) for multi-ion analysis is primarily ascribed to the following reasons: (i) excellent reproducibility owing to the easy renewal of the electrode surface avoiding any hysteresis effect (i.e., a new identical drop is generated for each measurement to be accomplished); (ii) a wide cathodic potential window originating from the passive hydrogen evolution and solvent electrolysis; (iii) the ability to form amalgams with many redox-active metal ions; and (iv) the achievement of (sub)nanomolar limits of detection. On the other hand, the main controversy of the HMDE usage is the high toxicity level of mercury, which has motivated the scientific community to question whether the HMDE deserves to continue being used despite its unique capability for multi-metal detection. In this work, the simultaneous determination of Zn2+, Cd2+, Pb2+, and Cu2+ using the HMDE is investigated as a model system to evaluate the main features of the technique. The analytical benefits of the HMDE in terms of linear range of response, reproducibility, limit of detection, proximity to ideal redox behavior of metal ions and analysis time are herein demonstrated and compared to other electrodes proposed in the literature as less-toxic alternatives to the HMDE. The results have revealed that the HMDE is largely superior to other reported methods in several aspects and, moreover, it displays excellent accuracy when simultaneously analyzing Zn2+, Cd2+, Pb2+, and Cu2+ in such a complex matrix as digested soils. Yet, more efforts are required towards the definitive replacement of the HMDE in the electroanalysis field, despite the elegant approaches already reported in the literature.

Triethanolammonium salts of biologically active carboxylic acids

2015 ◽  
Vol 85 (12) ◽  
pp. 2710-2714 ◽  
Author(s):  
Yu. A. Kondratenko ◽  
T. A. Kochina ◽  
V. S. Fundamensky ◽  
Yu. G. Vlasov
Keyword(s):  
Carboxylic Acids ◽  
Biologically Active ◽  
Biologically Active Carboxylic Acids

scholarly journals Mass Spectral Studies of the Biologically Active Stereoisomer Family of e,e,e-(Methanofullerene(60-63)-Carboxylic Acids

2018 ◽  
Vol 14 (4) ◽  
pp. 406-415
Author(s):  
Michael Grayson ◽  
Joshua Hardt ◽  
Michael Gross ◽  
Subhasish K. Chakraborty ◽  
Laura Dugan
Keyword(s):  
Carboxylic Acids ◽  
Biologically Active ◽  
Spectral Studies ◽  
Mass Spectral

Binuclear metal chelate complexes of anthraquinones having a MO4 chromophore. Part 1. Quinizarin

1987 ◽  
Vol 65 (7) ◽  
pp. 1485-1490 ◽  
Author(s):  
M. N. Bakola-Christianopoulou ◽  
P. D. Akrivos ◽  
M. Baumgarten
Keyword(s):  
Metal Ions ◽  
Magnetic Measurements ◽  
Metal Chelate ◽  
Transition Elements ◽  
Chelate Complexes ◽  
Cobalt Nickel ◽  
Oxygen Donor ◽  
Nickel Copper ◽  
Square Planar ◽  
Coordination Spheres

Homobinuclear metal chelate complexes having 1,4-dihydroxy-9,10-anthracenedione (quinizarin) as a bridging unit have been prepared with four bivalent first row transition elements, namely cobalt, nickel, copper, and zinc. The coordination spheres of the metal ions consist of two nearly equivalent six-membered rings with oxygen donor atoms derived from the quinizarin and the terminal ligands which are either β-diketones or salicylic aldehyde. TG, spectroscopic (ir, uv–vis, epr), and magnetic measurements have been applied to an investigation of the geometry adopted by the MO4 chromophores. The results are consistent with varying degrees of distortion from the ideal square planar toward a tetrahedral arrangement around the metal ions, closely related to the specific metal center involved.

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