Abstract:
Common cornfl akes (CCF) and sugar - frosted cornfl akes (SCF) were ground and stored at relative humidities (RHs) of 11% - 80% at 25 ° C to achieve a water content (WC) between 5% and 20% dry basis (db). Time - resolved proton nuclear magnetic resonance (TR - 1 H NMR) measuring the spin - spin transverse relaxation time ( T 2 ) was used to determine the mobility of water and solids. T 2 analysis following a single 90 ° pulse (free - induction decay [FID]) was used to evaluate molecular mobility coupled to the solid matrix in the temperature range of 4 ° - 90 ° C. Water mobility was evaluated using a spin - echo (90 ° - ô - 180 ° ) sequence. The FID analysis in both types of cornfl akes (CF) showed a single T 2 . At a WC close to the Guggenheim - Anderson - de Boer (GAB) monolayer value (m 0 = 5% db), the spin - echo analysis showed a short - relaxing T 2 component ( T 2S ) at 25 - 30 ì s that was attributed to the mobility of protons from solids and the most closely associated water molecules. T 2S increased at temperatures above the glass transition temperature ( T g ), indicating higher proton mobility due to plasticization of solids by water. A long - relaxing T 2 component ( T 2L ) was observed at RHs above m 0 and increased as WC increased in the range of 0.4 - 2.5 ms, manifesting the higher mobility of water protons. At very low WC, water acts as an antiplasticizer, but beyond a critical level, the plasticizing effect became evident in mechanical properties. The temperature dependence of water and solid molecular mobility can be analyzed by TR - 1 H NMR. © 2010 Blackwell Publishing.
Registro:
| Documento: |
Parte de libro
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| Título: | Thermal Transitions, Mechanical Properties, and Molecular Mobility in Cornflakes as Affected by Water Content |
| Autor: | Farroni, A.; Matiacevich, S.B.; Guerrero, S.; Alzamora, S.; Buera, M.P. |
| Filiación: | Instituto Nacional de Tecnología Agropecuaria, Pergamino, Pcia de Buenos Aires, Argentina
Departamento de Industrias, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires, Argentina
Departamentos de Industrias y de Química Orgánica, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires, Argentina
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| Palabras clave: | Common cornflakes (CCF) and sugar-frosted cornflakes (SCF) storage; Corn types and CF quality - cornflakes mechanical properties; Food products shelf-life stability and thermal properties; Thermal transitions and molecular mobility in cornflakes; TR-H NMR - solid molecular mobility tempearture dependence analysis; TR-H NMR - Time-resolved proton nuclear magnetic resonance; Water adsorption by biopolymers - brittle fracture possibility reduction |
| Año: | 2010
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| Página de inicio: | 583
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| Página de fin: | 589
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| DOI: |
http://dx.doi.org/10.1002/9780470958193.ch53 |
| Título revista: | Water Properties in Food, Health, Pharmaceutical and Biological Systems: ISOPOW 10
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| Título revista abreviado: | Water Prop. in Food, Health, Pharmaceutical and Biol. Syst.: ISOPOW 10
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| Registro: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_97808138_v_n_p583_Farroni |
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Citas:
---------- APA ----------
Farroni, A., Matiacevich, S.B., Guerrero, S., Alzamora, S. & Buera, M.P.
(2010)
. Thermal Transitions, Mechanical Properties, and Molecular Mobility in Cornflakes as Affected by Water Content. Water Properties in Food, Health, Pharmaceutical and Biological Systems: ISOPOW 10, 583-589.
http://dx.doi.org/10.1002/9780470958193.ch53---------- CHICAGO ----------
Farroni, A., Matiacevich, S.B., Guerrero, S., Alzamora, S., Buera, M.P.
"Thermal Transitions, Mechanical Properties, and Molecular Mobility in Cornflakes as Affected by Water Content"
. Water Properties in Food, Health, Pharmaceutical and Biological Systems: ISOPOW 10
(2010) : 583-589.
http://dx.doi.org/10.1002/9780470958193.ch53---------- MLA ----------
Farroni, A., Matiacevich, S.B., Guerrero, S., Alzamora, S., Buera, M.P.
"Thermal Transitions, Mechanical Properties, and Molecular Mobility in Cornflakes as Affected by Water Content"
. Water Properties in Food, Health, Pharmaceutical and Biological Systems: ISOPOW 10, 2010, pp. 583-589.
http://dx.doi.org/10.1002/9780470958193.ch53---------- VANCOUVER ----------
Farroni, A., Matiacevich, S.B., Guerrero, S., Alzamora, S., Buera, M.P. Thermal Transitions, Mechanical Properties, and Molecular Mobility in Cornflakes as Affected by Water Content. Water Prop. in Food, Health, Pharmaceutical and Biol. Syst.: ISOPOW 10. 2010:583-589.
http://dx.doi.org/10.1002/9780470958193.ch53