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- W4376142188 abstract "We investigated the kinetics of conversion of hemin to β-hematin in aqueous-acetate medium in absence and in presence of two concentrations of chloroquine by using eleven reported kinetic equations. The two best kinetic equations are the combination of order 1 and Avrami and the combination of second order and logistic equations, based on the statistical parameters variance and overall errors. The best fitted equations are composed of two terms from which we model the formation of β-hematin as the result of two processes: the availability of reactive precursors and the formation of nucleation and growth sites. The crystals exhibit needle-like morphologies of about 760 nm long and 140 nm wide. However, the increment of chloroquine favors the formation of crystal twinning with non-homogenous distribution, crystals with lower sizes of similar heights and widths, and crystals symmetrically tapered at the ends of the needles. The lattice volumes, obtained from Rietveld analysis of powder X-ray diffraction patterns, were not regularly affected by chloroquine. The main IR absorption bands did not appreciably change in positions nor in intensities with varying chloroquine concentration. However, important changes were observed in the 2000-4000 cm-1 region. We used Density Functional Theory calculations to understand these changes." @default.
- W4376142188 created "2023-05-12" @default.
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- W4376142188 date "2023-05-11" @default.
- W4376142188 modified "2023-09-27" @default.
- W4376142188 title "Revising the formation of β-hematin crystals from hemin in aqueous-acetate medium containing chloroquine: modeling the kinetics of crystallization and characterizing their physico-chemical properties" @default.
- W4376142188 doi "https://doi.org/10.26434/chemrxiv-2023-mvx5c" @default.
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