Crystallization kinetics of concentrated α,α-trehalose and α,α-trehalose/salt solutions studied by low-resolution 1H-pulsed NMR

Crystallization kinetics of concentrated trehalose and trehalose/salt solutions were followed by proton (1H) pulsed nuclear magnetic resonance (1H p-NMR). Three concentrations (66, 70, and 72.5%) of trehalose and with the addition of ZnCl2.2H2O, CaCl2.2H2O, and MgCl2.2H2O were crystallized at 5, 10,...

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Detalles Bibliográficos
Autores principales: Gallo, A., Buera, M.P., Herrera, M.L.
Formato: JOUR
Materias:
Avrami analysis
Crystal morphology
Crystallization kinetics
NMR
Trehalose
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00221147_v67_n4_p1331_Gallo
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
Descripción
Sumario:Crystallization kinetics of concentrated trehalose and trehalose/salt solutions were followed by proton (1H) pulsed nuclear magnetic resonance (1H p-NMR). Three concentrations (66, 70, and 72.5%) of trehalose and with the addition of ZnCl2.2H2O, CaCl2.2H2O, and MgCl2.2H2O were crystallized at 5, 10, 15, 20, and 25°C. Supercooling and molecular diffusion determined the crystallization rates. The highest rate of crystallization of 66, 70, and 72.5% trehalose occurred at 20°C, whereas the lowest rate occurred at 25°C. The maximum solid content was higher at lower temperatures, as expected based on the higher supercooling values. Crystallization was delayed by the addition of salts and especially of CaCl2.2H2O.

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