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- W4366989277 abstract "The speciation of epinephrine (Eph-) in the presence of alginate (Alg2-) and two biological and environmental relevant metal cations (Cu2+, UO22+) was investigated at T = 298.15K, I = 0.15-1.00 mol dm-3 in NaCl(aq). The formation of binary and ternary complexes was evaluated and, since epinephrine can behave as a zwitterion, the Eph-/Alg2- interaction was studied by means of DOSY NMR. The dependence of the equilibrium constants on ionic strength was studied using an extended Debye-Hückel type equation and the SIT approach. The effect of temperature was investigated by means of isoperibolic titration calorimetry: the entropic contribution was the driving force for the Cu2+/Eph- complexes formation. The sequestering ability of Eph- and Alg2- on Cu2+, evaluated by the pL0.5 calculation, increased with pH and ionic strength. The determination of pM parameter showed that Eph- had a higher Cu2+ affinity with respect to Alg2-. The formation of Eph-/Alg2- species was also investigated by UV-Vis spectrophotometry and 1H NMR measurements. The ternary Cu2+/Eph-/Alg2- and Cu2+/UO22+/Eph- interactions were also studied. The extra-stability calculated for the mixed ternary species confirmed that their formation was thermodynamically favorable." @default.
- W4366989277 created "2023-04-27" @default.
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- W4366989277 date "2023-04-25" @default.
- W4366989277 modified "2023-09-27" @default.
- W4366989277 title "Binary and ternary complexes of epinephrine with alginate and biologically and environmentally relevant metal cations" @default.
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- W4366989277 doi "https://doi.org/10.3389/fchem.2023.1189308" @default.
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