Learn More
The acid-base properties of Adenosine 5'-triphosphate (ATP) in NaCl and KCl aqueous solutions at different ionic strengths (0<I/mol L(-1)<or=5 for NaCl(aq), 0<I/mol L(-1)<or=3 for KCl(aq)) and at t=25 degrees C were investigated. A selection of literature data on ATP protonation constants and on activity isopiestic coefficients was performed, together with(More)
The empirical parameters of a two-parameter SIT equation were determined for some 1:2 electrolytes: chlorides, bromides, iodides, nitrates, perchlorates of alkali earth metals and sulfates of alkali metals. A wide range of ionic strengths (0 < I < or = 18 mol kg(-1)) and t = 25 degrees C was considered. Canonical correlation analysis showed quite(More)
Copper(II) complexes with the herbicide N-(phosphonomethyl)glycine (glyphosate) have been investigated in aqueous solution by means of pH-metric measurements at different temperatures, 5 </= T </= 45 degrees C, calorimetry and visible spectrophotometry. Potentiometric data, at all the considered temperatures in the range 2.5 </= pH </= 10.5, can be(More)
The effect of simple and mixed copper(II) complexes of L-tryptophan (trp) and L-phenylalanine (phe) on the gastric acid secretion was investigated in Shay rats. Graded doses (from 15 to 75 mg/kg) of [Cu(trp)2(H2O)], [Cu(phe)2(H2O)] and [Cu(trp)(phe)(H2O)], administered i.g., caused a progressive inhibition of gastric acid secretion. The antisecretory(More)
In this paper the results of a potentiometric (ISE-[H+] glass electrode) investigation at t = 25 degreesC on the complexing ability of phytate towards trimethyltin(IV) (tmt) and on the acid-base properties of tmt at high metal concentration (0.050 and 0.075 mol L(-1)) are reported. First we determined the hydrolytic constants of tmt in aqueous solution(More)
The acid-base properties of phytic acid [ myo-inositol 1,2,3,4,5,6-hexakis(dihydrogen phosphate)] (H(12)Phy; Phy(12-)=phytate anion) were studied in aqueous solution by potentiometric measurements ([H+]-glass electrode) in lithium and potassium chloride aqueous media at different ionic strengths (0< I mol L(-1)< or =3) and at t=25 degrees C. The protonation(More)
1. The serum oxalate concentration rises in chronic renal failure and it is only partially eliminated by regular dialysis treatment. However, the recent literature is not conclusive on whether progressive oxalate retention and secondary oxalosis should be expected in patients on regular dialysis treatment. 2. To further investigate this, we have estimated(More)
Quantitative parameters for the interactions between phytate (Phy) and Al(3+), Fe(3+), and Cr(3+) were determined potentiometrically in NaNO(3) aqueous solutions at I = 0.10 mol L(-1) and T = 298.15 K. Different complex species were found in a wide pH range. The various species are partially protonated, depending on the pH in which they are formed, and are(More)
BACKGROUND The pathogenesis of nephrolithiasis, based on the anomalies of the urinary environment, demands metabolic and physicochemical assessment for the medical management of patients. Standard metabolic protocols include the measurement of pertinent urine chemistry values and the calculation of the extent of saturation in stone-forming salts. However,(More)
In order to analyze the formation of hetero-metal polynuclear hydrolytic species, in this paper, we reported some results of an investigation (at I = 0.16molL(-1) in NaNO(3), at t = 25 degrees C by potentiometry, ISE-H(+), glass electrode) on the hydrolysis of several mixtures (in different ratios) of two couples of cations: dioxouranium(VI)/copper(II) and(More)