Abstract:
This work analyzed the relationship between water mobility and quinoa seed longevity. Transverse relaxation times ( T 2 s) by time - resolved nuclear magnetic resonance (NMR) of four genotypes of quinoa seeds (cultivars Chadmo , NL - 6 , Sajama , and 2 - Want ) equilibrated at relative humidities (RHs) in the range of 22% - 83% were measured. Quinoa seed germination and viability were tested. The curves obtained from seeds equilibrated at low RHs were fi tted best to monoexponential decay, with T 2 values in the range of 100 - 130 ms. The amplitude of the signal was related to the relative amount of lipid and was unaffected by RH. At 50% RH, curves began to fi t biexponential decay best. The second term of the biexponential curves showed T 2 values in the range of 1.13 - 2.54 ms, increasing as RH increased. The analysis of isotherm shapes and glass transition temperatures of quinoa seeds revealed that the second term could be attributed to protons both of water in multilayers and of plasticized solids above the glass transition temperature. Germination tests showed different storage behaviors between cultivars. Water mobility alone did not explain quinoa seed longevity after storage under these experimental conditions. © 2010 Blackwell Publishing.
Registro:
| Documento: |
Parte de libro
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| Título: | Molecular Mobility and Seed Longevity in Chenopodium quinoa |
| Autor: | Castellión, M.; Maldonado, S.; Buera, M.D.P. |
| Filiación: | Departamento de Biodiversidad y Biología Experimental, 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: | Molecular mobility, seed longevity-chenopodium quinoa; Monoexponential and biexponential decay curves-fitting experimental data; Monoexponential curves-constant in biexponential curves; Proton spin relaxation times-predicting quinoa seed longevity; Temperature and moisture-fundamental role in storage longevity of seeds; Time-resolved nuclear magnetic resonance (NMR) spectroscopy-studying water status and metabolic changes |
| Año: | 2010
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| Página de inicio: | 647
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| Página de fin: | 655
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| DOI: |
http://dx.doi.org/10.1002/9780470958193.ch62 |
| 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_p647_Castellion |
Referencias:
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Citas:
---------- APA ----------
Castellión, M., Maldonado, S. & Buera, M.D.P.
(2010)
. Molecular Mobility and Seed Longevity in Chenopodium quinoa. Water Properties in Food, Health, Pharmaceutical and Biological Systems: ISOPOW 10, 647-655.
http://dx.doi.org/10.1002/9780470958193.ch62---------- CHICAGO ----------
Castellión, M., Maldonado, S., Buera, M.D.P.
"Molecular Mobility and Seed Longevity in Chenopodium quinoa"
. Water Properties in Food, Health, Pharmaceutical and Biological Systems: ISOPOW 10
(2010) : 647-655.
http://dx.doi.org/10.1002/9780470958193.ch62---------- MLA ----------
Castellión, M., Maldonado, S., Buera, M.D.P.
"Molecular Mobility and Seed Longevity in Chenopodium quinoa"
. Water Properties in Food, Health, Pharmaceutical and Biological Systems: ISOPOW 10, 2010, pp. 647-655.
http://dx.doi.org/10.1002/9780470958193.ch62---------- VANCOUVER ----------
Castellión, M., Maldonado, S., Buera, M.D.P. Molecular Mobility and Seed Longevity in Chenopodium quinoa. Water Prop. in Food, Health, Pharmaceutical and Biol. Syst.: ISOPOW 10. 2010:647-655.
http://dx.doi.org/10.1002/9780470958193.ch62