Analysis of the heterogeneous rate of dissociation of Cu(II) from humic and fulvic acids by statistical deconvolution

Staney, Brett J.; Topper, K.; Marshall, David B.

doi:10.1016/0003-2670(94)85097-6

Cited by 16 publications

(20 citation statements)

References 16 publications

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“…We have also implemented maximum entropy (ME) regularization, which is widely used, for example, in the analysis of decay times in autocorrelation functions (Livesey et al, 1986), time-resolved fluorescence (Brochon, 1994;van der Heide et al, 2000;Steinbach et al, 2002), enthalpy distributions (Poland, 2001a), thermodynamic distributions in ligand binding (Steinbach, 1996;Poland, 2001b), distribution of dissociation rate constants (Stanley et al, 1994), diffusion corrected sedimentation coefficient distributions in analytical ultracentrifugation (Schuck, 2000), and other biophysical disciplines. ME was found to result in sharper peaks if a few discrete species are present, but to exhibit some instability for broad distributions (Amato and Hughes, 1991;Provencher, 1992;Schuck et al, 2002).…”

Section: Discussionmentioning

confidence: 99%

Combined Affinity and Rate Constant Distributions of Ligand Populations from Experimental Surface Binding Kinetics and Equilibria

Švitel

Balbo

Mariuzza

et al. 2003

Biophysical Journal

118

160

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The present article considers the influence of heterogeneity in a mobile analyte or in an immobilized ligand population on the surface binding kinetics and equilibrium isotherms. We describe strategies for solving the inverse problem of calculating two-dimensional distributions of rate and affinity constants from experimental data on surface binding kinetics, such as obtained from optical biosensors. Although the characterization of a heterogeneous population of analytes binding to uniform surface sites may be possible under suitable experimental conditions, computational difficulties currently limit this approach. In contrast, the case of uniform analytes binding to heterogeneous populations of surface sites is computationally feasible, and can be combined with Tikhonov-Phillips and maximum entropy regularization techniques that provide the simplest distribution that is consistent with the data. The properties of this ligand distribution analysis are explored with several experimental and simulated data sets. The resulting two-dimensional rate and affinity constant distributions can describe well experimental kinetic traces measured with optical biosensors. The use of kinetic surface binding data can give significantly higher resolution than affinity distributions from the binding isotherms alone. The shape and the level of detail of the calculated distributions depend on the experimental conditions, such as contact times and the concentration range of the analyte. Despite the flexibility introduced by considering surface site distributions, the impostor application of this model to surface binding data from transport limited binding processes or from analyte distributions can be identified by large residuals, if a sufficient range of analyte concentrations and contact times are used. The distribution analysis can provide a rational interpretation of complex experimental surface binding kinetics, and provides an analytical tool for probing the homogeneity of the populations of immobilized protein.

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Section: Discussionmentioning

confidence: 99%

Combined Affinity and Rate Constant Distributions of Ligand Populations from Experimental Surface Binding Kinetics and Equilibria

Švitel

Balbo

Mariuzza

et al. 2003

Biophysical Journal

118

160

View full text Add to dashboard Cite

show abstract

“…It should be noted that for heterogeneous systems, analysis of rate constant distributions is a mathematically ill-posed problem and slight perturbations in the input experimental data can yield artefactual information (Stanley et al, 1994).…”

Section: Kinetic Propertiesmentioning

confidence: 99%

Speciation in Freshwaters

Filella¹,

Town²,

Buffle³

2002

Chemical Speciation in the Environment

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“…it is possible to perform the inverse transformation of a kinetic curve directly. In the last few years, different numeri-THEORY cal techniques have been applied on such problems like the Equilibrium ion exchange of Cd 2/ at montmorillonite (8) or the dissociation of Cu 2/ from humic acids (9). Additionally these algoAt minerals with a heterogeneous surface, many different rithms have been analyzed theoretically (10).…”

Section: Introductionmentioning

confidence: 99%

“…2 Na [9] If the number of all types is high enough, the sum may be By introducing a quantity d as a reaction variable as defined replaced by an integral.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Kinetics and Equilibrium of Cadmium Complexation with Heterogeneous Complexants: A Stopped-Flow Study at Na-Illite

Pohlmeier

Rützel

1996

Journal of Colloid and Interface Science

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Analysis of the heterogeneous rate of dissociation of Cu(II) from humic and fulvic acids by statistical deconvolution

Cited by 16 publications

References 16 publications

Combined Affinity and Rate Constant Distributions of Ligand Populations from Experimental Surface Binding Kinetics and Equilibria

Combined Affinity and Rate Constant Distributions of Ligand Populations from Experimental Surface Binding Kinetics and Equilibria

Speciation in Freshwaters

Kinetics and Equilibrium of Cadmium Complexation with Heterogeneous Complexants: A Stopped-Flow Study at Na-Illite

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