Thermodynamic Behavior of Polyalcohols and Speciation Studies in the Presence of Divalent Metal Cations

Abstract

The acid−base properties and complexing ability of some biologically relevant polyalcohols (erythritol, sorbitol, maltol, and ethylmaltol) toward bivalent metal cations have been determined by potentiometric measurements with an ISE-H + glass electrode in NaNO 3 aqueous solutions at I = 0.151 mol•kg −1 and T = 298.15 K. For the erythritol system, the investigations have been carried out in the ionic strength range 0.1 ≤ I/mol•kg −1 ≤ 1.0, and the dependence on the ionic strength of the protonation and stability constants has been modeled by the specific ion interaction theory (SIT). The sequestering ability of the different ligands toward the considered metal cations (Ca 2+ , Zn 2+ , and Sn 2+ ) has been evaluated by the pL 0.5 parameter. For example, for M 2+ /maltol systems, at T = 298.15 K in NaNO 3(aq) , I = 0.151 mol•kg −1 , and pH 7.4, the sequestering ability toward Zn 2+ (pL 0.5 = 4.60) is higher than that toward Sn 2+ (pL 0.5 = 3.94) and Ca 2+ (pL 0.5 = 1.27).

Biological durability and wood–water interactions of sorbitol and citric acid (SorCA) modified wood

“…SorCA-modified wood, being a distinct growth substrate for fungi, could potentially impact gene expression in the tested Basidiomycetes, impeding the non-enzymatic stage of brown rot decay. It should be also considered that both citric acid and sorbitol, as well as citric acid-and sorbitol-based compounds are highly effective chelating agents [59,60]. Consequently, they may compete with oxalate (also a potent chelating agent) for iron at the non-enzymatic decay stage [35].…”

Binary and ternary complexes of epinephrine with alginate and biologically and environmentally relevant metal cations

“…In recent decades, many molecules (such as amino acids, hormones, and carboxylic acids) participating in normal human body functions or compounds extracted by natural matrices (Grgas-Kužnar et al, 1974;Gergely et al, 1981;Kiss and Gergely, 1983;Schiewer and Volesky, 1996;Gerard and Hanane, 1997;Schneider and Rubio, 1999;Davis et al, 2003;Cigala et al, 2015;Piperea-Şianu et al, 2015;Idota et al, 2016;Vione et al, 2016) have been tested as potential metal chelators for biological or environmental applications.…”