1c:I[419806,["/_next/static/chunks/bb923814e1f4d2e9.js","/_next/static/chunks/dd3ee9f5b7716ca6.js","/_next/static/chunks/4204a0ae82542ca8.js","/_next/static/chunks/30036bedc5269936.js","/_next/static/chunks/6e1aa89a642f40be.js","/_next/static/chunks/cd5e572bc3e4eb92.js","/_next/static/chunks/8ffd0b71567920d8.js","/_next/static/chunks/67ea6dfd21f16c5f.js","/_next/static/chunks/24eb4379f68013fd.js","/_next/static/chunks/b8cd775ffdf935bd.js","/_next/static/chunks/983103cd9eb7b428.js","/_next/static/chunks/d4ac9dcf27f6ff52.js","/_next/static/chunks/294b9525248c8e5f.js"],"default"] 1d:T537,The acid-base properties of two bifunctional 3-hydroxy-4-pyridinone ligands and their chelating capacity towards Zn²⁺, an essential bio-metal cation, were investigated in NaCl aqueous solutions by potentiometric, UV-Vis spectrophotometric, and ¹H NMR spectroscopic titrations, carried out at 0.15 ≤ I/mol ^-1 ≤ 1.00 and 288.15 ≤ T/K ≤ 310.15. A study at I = 0.15 mol L^-1 and T = 298.15 K was also performed for other three Zn²⁺/L^z- systems, with ligands belonging to the same family of compounds. The processing of experimental data allowed the determination of protonation and stability constants, which showed accordance with the data obtained from the different analytical techniques used, and with those reported in the literature for the same class of compounds. ESI-MS spectrometric measurements provided support for the formation of the different Zn²⁺/ligand species, while computational molecular simulations allowed information to be gained on the metal-ligand coordination. The dependence on ionic strength and the temperature of equilibrium constants were investigated by means of the extended Debye-Hückel model, the classical specific ion interaction theory, and the van't Hoff equations, respectively.1e:T538,The effect of sun-drying, oven-drying, and freeze-drying methods on the nutritional composition of the seaweed Sargassum hemiphyllum (Turn.) C. Ag. was investigated. Proximate and nutrient compositions (amino acids, fatty acids, minerals, and vitamin C) of the seaweed dried by the above methods were determined. The results indicated that dietary fiber and ash were the most abundant components of seaweed S. hemiphyllum. No significant differences in the content of crude protein and crude lipid were found among all three dried seaweed samples. Freeze-dried seaweed had the highest content of total amino acids, total polyunsaturated fatty acids, and total vitamin C when compared with sun-dried and oven-dried seaweed. However, sun-dried seaweed has the lowest values of ash, mineral, and total vitamin C contents among the three dried seaweed samples. This might be due to the leaching effect and long exposure time to air during sun-drying. Although oven-dried seaweed had the greatest nutrient losses, probably due mainly to the effect of high temperature during drying, it contained the highest mineral content. Thus, it can be concluded that the nutritional composition of seaweed S. hemiphyllum is greatly affected by different drying methods. Keywords: Seaweed; freeze-drying; oven-drying; sun-drying; nutritional composition1f:T5dc,

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