Complex formation equilibria between 2-amino-2(hydroxymethyl)-1,3,-propanediol (tris, tham) and nickel(II), copper(II), zinc(II) and hydrogen ions in aqueous solutions

Beryllium binding to adenosine 5′-phosphates in aqueous solution at 25°C

“…Protonation constants and complex formation constants were derived from 16 L. Alderighi et al potentiometric titration data using the program HYPERQUAD [14] in which the sum of weighted, squared residuals in emf is minimized. The ''best'' model for each ligand was selected according to a series of hypothesis tests, described previously [17], involving the values of , the SD of the weighted residuals, the SDs on the equilibrium constants and 2 , an indicator of the normality of the distribution of the residuals. Values of the stability constants and associated statistics for the selected model are given in table 2.…”

Quantification of single-stranded nucleic acid and oligonucleotide interactions with metal ions by affinity capillary electrophoresis: part I

“…We initially considered Tris as a buffer as it is commonly used as a medium for studies of metal ion-DNA interactions with DNA [11,12,21] and is particularly suitable for capillary electrophoresis experiments owing to its low conductivity [22]. However, transition metal ions form complexes of reasonable stability with Tris [20,[23][24][25][26][27][28][29] and ternary M(DNA)(Tris) complexes with oligonucleotides or DNA [16,20]. Measured macroscopic K B values in the presence of a large excess of buffer will relate to mixtures of species.…”

Mono‐ and Dinuclear CuII and ZnII Complexes of Cyclen‐Based Bis(macrocycles) Containing Two Aminoalkyl Pendant Arms of Different Lengths

“…[63] and ref. [64] for two different proposed models, A and B. Assuming that the minimum value of the sample variance, σ A 2 , has been reached for the proposed model A, an alternative model B, which supplies a value of the variance σ B 2 , was rejected if σ B 2 /σ A 2 Ͼ F, where σ A and σ B are given directly by data treatment with the HYPERQUAD [62] program.…”