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- W2754212621 abstract "Using UV–Vis spectrophotometry a stability study of melatonin at different pH values was done in aqueous media, finding that at acidic pH melatonin is unstable when interacting with the environment, however it becomes stable protecting it from light and oxygen. From the UV–Vis spectra and SQUAD software, melatonin pKa values, in a completely protected aqueous medium, were estimated as 5.777 ± 0.011 and 10.201 ± 0.024. Using the same techniques, the melatonin and β-cyclodextrin inclusion complex formation constants were assessed at pH 3, 7 and 11.5, giving the values of log β = (3.07 ± 0.06), (2.94 ± 0.01) and (3.07 ± 0.06) M− 1, respectively. From the global acidity formation constants and the complexes' formation constants, the molar fractions were determined for each species of MT and MT − βCD, to build the molar fraction–[βCD]–pH 3D diagram and the molar fraction-pH 2D diagrams, where it was possible to observe the predominance of the MT species with and without βCD. A voltammetric study at pH 3, allowed obtaining a value of log β = (3.15 ± 0.01) M− 1, which corroborates that obtained through UV–Vis spectrophotometry, supporting strongly the rationale behind using simple, straightforward techniques." @default.
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- W2754212621 date "2018-02-01" @default.
- W2754212621 modified "2023-10-18" @default.
- W2754212621 title "New insights on the spectrophotometric determination of melatonin pKa values and melatonin-βCD inclusion complex formation constant" @default.
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- W2754212621 doi "https://doi.org/10.1016/j.saa.2017.09.042" @default.
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