Speciation of binary complexes of Ca(II), Mg(II) and Zn(II) with L-dopa in dioxane–water mixtures

Devi, K.V. Santhee; Raju, B. Rama; Rao, G. Nageswara

doi:10.3184/095422910x12829312795432

Cited by 5 publications

(4 citation statements)

References 14 publications

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“…In order to rely upon the best fit chemical model for critical evaluation and application under varied experimental conditions with different accuracies of data acquisition, an investigation was made by introducing pessimistic errors in the influential parameters. The results of a typical system given in Table 3 emphasise that the errors in the concentrations of alkali > acid > ligand > correction factor as was observed in the earlier studies (Santhee Devi et al, 2010). Increase in the standard deviations of log ß upon incorporation of errors indicates that the experimental data have minimum errors.…”

Section: Effect Of Systematic Errors In Best Fit Modelsupporting

confidence: 61%

Effect of dielectric constant on protonation equilibria of 2, 3-dihydroxybenzoic acid and malonic acid in 1, 2-propanediol-water mixtures

Hirpaye¹,

Zekarias²,

Rao³

2012

Chemical Speciation & Bioavailability

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The protonation constants of 2,3-diydroxybenzoic acid (2, 3-DHBA) and malonic acid (MA) at 303.0 ± 0.1 K and 0.16 mol L -1 ionic strength in various concentrations (0-60% v/v) of 1,2-propanediol-water-mixtures were determined by pH-metric method. The protonation constants were calculated with MINIQUAD75 computer program. Selection of the best fit chemical models of the acid-base equilibria was based on statistical parameters. The log K values were found to increase with the increase in percentage of 1,2-propanediol and vary linearly with the reciprocal of the dielectric constant of the medium. This has been attributed to the dominance of electrostatic forces. Distributions of species and effect of influential parameters on the protonation constants are also presented.

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Section: Effect Of Systematic Errors In Best Fit Modelsupporting

confidence: 61%

Effect of dielectric constant on protonation equilibria of 2, 3-dihydroxybenzoic acid and malonic acid in 1, 2-propanediol-water mixtures

Hirpaye¹,

Zekarias²,

Rao³

2012

Chemical Speciation & Bioavailability

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“…When the data are fit into the models, the residuals should ideally be equal to zero Santhee Devi, et al, 2012). Furthermore, a model is considered adequate only if the residuals do not show any trend.…”

Section: Residual Analysismentioning

confidence: 99%

Influence of dielectric constant on protonation equilibria of maleic acid and L-asparagine in acetonitrile water-mixtures

Rao

Ramanaiah

Sailaja

2014

Chemical Speciation & Bioavailability

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The protonation constants of maleic acid and L-asparagine have been studied pH-metrically in various concentrations (0-50% v/v) of acetonitrile-water mixtures maintaining an ionic strength of 0.16 mol L -1 at 30 0 C. The protonation constants have been calculated using the computer program MINIQUAD75 and are selected based on statistical parameters. Linear variation of step-wise protonation constants (log K) with the reciprocal of the dielectric constant of the solvent mixture has been attributed to the dominance of the electrostatic forces.

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“…The complexation behavior and stability constant of transition metal complex of thiouracil has been reported in previous literature 5 . The stability constant and complexation behavior of Co(II), Zn(II) and Cu(II) complexes with various ligand has also been studied extensively [6][7][8] . Asparagine is one of the 20 most common natural amino acids and synthesized from central metabolic pathway intermediates in human being yet not essential for human diet.…”

Section: Introductionmentioning

confidence: 99%

Formation Constants of Transition Metal Mixed Ligand Ternary Complexes with Biologically Significant Ligands

2016

Chem Sci Trans

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Coordination of ternary complexes of biologically active ligands with transition metals were investigated in aqueous media at 37±1 °C under ionic strength I = 0.1 M NaNO 3. Amino acid asparagine (primary ligand =A) and nucleic acid thiouracil (secondary ligand=B) were applied for complex formation with Cu(II), Ni(II), Zn(II) and Co(II) in aqueous solution (1:1:1). The plausible equilibria have been deduced on the basis of speciation curves obtained through BEST computer program and species are also presented and discussed. The Protonation constant and metal ligand stability constant has been determined through the method suggested by Irving & Rossotti and further refined through BEST computer program. The mixed ligand ternary complexes were occurring simultaneously in most cases generally at high pH with gradually declination of binary complexes of particular metal complexes. The order of mixed ligands ternary system were found A-Cu (

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Speciation of binary complexes of Ca(II), Mg(II) and Zn(II) with L-dopa in dioxane–water mixtures

Cited by 5 publications

References 14 publications

Effect of dielectric constant on protonation equilibria of 2, 3-dihydroxybenzoic acid and malonic acid in 1, 2-propanediol-water mixtures

Effect of dielectric constant on protonation equilibria of 2, 3-dihydroxybenzoic acid and malonic acid in 1, 2-propanediol-water mixtures

Influence of dielectric constant on protonation equilibria of maleic acid and L-asparagine in acetonitrile water-mixtures

Formation Constants of Transition Metal Mixed Ligand Ternary Complexes with Biologically Significant Ligands

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