Water-dependent thermal transitions in quinoa embryos

The water-dependent thermal transitions of the embryos in the mature seeds of Chenopodium quinoa Willd., cv. Baer II were studied by differential scanning calorimetry in order to provide tools for analyzing seed deterioration during storage. For comparative purposes, Guggenheim-Anderson-de Boer (GAB...

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Autores principales:	Matiacevich, S.B., Castellión, M.L., Maldonado, S.B., Buera, M.P.
Formato:	JOUR
Materias:	Chenopodium quinoa Differential scanning calorimeter (DSC) Proteins Thermal transitions Atmospheric humidity Differential scanning calorimetry Glass transition Isotherms Thermal effects Protein denaturation Biodiversity
Acceso en línea:	http://hdl.handle.net/20.500.12110/paper_00406031_v448_n2_p117_Matiacevich
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	todo:paper_00406031_v448_n2_p117_Matiacevich
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spelling	todo:paper_00406031_v448_n2_p117_Matiacevich2023-10-03T14:51:04Z Water-dependent thermal transitions in quinoa embryos Matiacevich, S.B. Castellión, M.L. Maldonado, S.B. Buera, M.P. Chenopodium quinoa Differential scanning calorimeter (DSC) Proteins Thermal transitions Atmospheric humidity Differential scanning calorimetry Glass transition Isotherms Proteins Thermal effects Chenopodium quinoa Protein denaturation Thermal transitions Biodiversity The water-dependent thermal transitions of the embryos in the mature seeds of Chenopodium quinoa Willd., cv. Baer II were studied by differential scanning calorimetry in order to provide tools for analyzing seed deterioration during storage. For comparative purposes, Guggenheim-Anderson-de Boer (GAB) constants from water sorption isotherms were also obtained from other two cultivars. Glass transition temperatures (Tg), overlapped with lipid melting, could be detected in defatted embryos. Quinoa seeds storage temperature should remain below 0 °C in order to maintain them in a glassy state if relative humidity is higher than 59%. Frozen water was detected in defatted embryos at water contents above 47% (dry basis, d.b.) while protein denaturation occurred even at 5% (d.b.) water content, although at a low extent. The results suggested that protein denaturation, without the requirement of lipid removal, is a potential index to follow seed deterioration during storage. © 2006 Elsevier B.V. All rights reserved. Fil:Matiacevich, S.B. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Castellión, M.L. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Buera, M.P. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00406031_v448_n2_p117_Matiacevich
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Chenopodium quinoa Differential scanning calorimeter (DSC) Proteins Thermal transitions Atmospheric humidity Differential scanning calorimetry Glass transition Isotherms Proteins Thermal effects Chenopodium quinoa Protein denaturation Thermal transitions Biodiversity
spellingShingle	Chenopodium quinoa Differential scanning calorimeter (DSC) Proteins Thermal transitions Atmospheric humidity Differential scanning calorimetry Glass transition Isotherms Proteins Thermal effects Chenopodium quinoa Protein denaturation Thermal transitions Biodiversity Matiacevich, S.B. Castellión, M.L. Maldonado, S.B. Buera, M.P. Water-dependent thermal transitions in quinoa embryos
topic_facet	Chenopodium quinoa Differential scanning calorimeter (DSC) Proteins Thermal transitions Atmospheric humidity Differential scanning calorimetry Glass transition Isotherms Proteins Thermal effects Chenopodium quinoa Protein denaturation Thermal transitions Biodiversity
description	The water-dependent thermal transitions of the embryos in the mature seeds of Chenopodium quinoa Willd., cv. Baer II were studied by differential scanning calorimetry in order to provide tools for analyzing seed deterioration during storage. For comparative purposes, Guggenheim-Anderson-de Boer (GAB) constants from water sorption isotherms were also obtained from other two cultivars. Glass transition temperatures (Tg), overlapped with lipid melting, could be detected in defatted embryos. Quinoa seeds storage temperature should remain below 0 °C in order to maintain them in a glassy state if relative humidity is higher than 59%. Frozen water was detected in defatted embryos at water contents above 47% (dry basis, d.b.) while protein denaturation occurred even at 5% (d.b.) water content, although at a low extent. The results suggested that protein denaturation, without the requirement of lipid removal, is a potential index to follow seed deterioration during storage. © 2006 Elsevier B.V. All rights reserved.
format	JOUR
author	Matiacevich, S.B. Castellión, M.L. Maldonado, S.B. Buera, M.P.
author_facet	Matiacevich, S.B. Castellión, M.L. Maldonado, S.B. Buera, M.P.
author_sort	Matiacevich, S.B.
title	Water-dependent thermal transitions in quinoa embryos
title_short	Water-dependent thermal transitions in quinoa embryos
title_full	Water-dependent thermal transitions in quinoa embryos
title_fullStr	Water-dependent thermal transitions in quinoa embryos
title_full_unstemmed	Water-dependent thermal transitions in quinoa embryos
title_sort	water-dependent thermal transitions in quinoa embryos
url	http://hdl.handle.net/20.500.12110/paper_00406031_v448_n2_p117_Matiacevich
work_keys_str_mv	AT matiacevichsb waterdependentthermaltransitionsinquinoaembryos AT castellionml waterdependentthermaltransitionsinquinoaembryos AT maldonadosb waterdependentthermaltransitionsinquinoaembryos AT bueramp waterdependentthermaltransitionsinquinoaembryos
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Water-dependent thermal transitions in quinoa embryos

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