Artículo
About the endothermal transitions of galactomannans: A multi-analytical DSC, LF- 1 H NMR and DMA study
Busch, Verónica María
; Santagapita, Patricio Roman
; Diaz Calderon, Paulo; Enrione, Javier I.; Buera, Maria del Pilar
Fecha de publicación:
05/2019
Editorial:
Elsevier
Revista:
Carbohydrate Polymers
ISSN:
0144-8617
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
The thermal transitions of biopolymers were subject of great discussion in the 90s due to their relevance in structure development during processing and stability on storage. In the present work two galactomannans, vinal gum and guar gum, were evaluated by DSC, DMA and LF-1 H NMR in order to compare them, establishing their potential operational application range and promoting the use of the non-conventional VG in foods or other products. Three endothermal transitions appeared when heating the samples in the DSC: one at temperatures −90 to −10 °C (LTT), other around 50 °C (MTT) and a third one between 50 and 100 °C (HTT). Both LTT and HTT showed water content dependence and low ΔCp values, which difficulted the assignment of a glass transition. MTT appeared as an enthalpic relaxation independent on frequency or on water content. This transition was related to changes in mechanical properties and with the stabilization of proton mobility.
Archivos asociados
Licencia
Identificadores
Colecciones
Articulos(ITAPROQ)
Articulos de INSTITUTO DE TECNOLOGIA DE ALIMENTOS Y PROCESOS QUIMICOS
Articulos de INSTITUTO DE TECNOLOGIA DE ALIMENTOS Y PROCESOS QUIMICOS
Citación
Busch, Verónica María; Santagapita, Patricio Roman; Diaz Calderon, Paulo; Enrione, Javier I.; Buera, Maria del Pilar; About the endothermal transitions of galactomannans: A multi-analytical DSC, LF- 1 H NMR and DMA study; Elsevier; Carbohydrate Polymers; 211; 5-2019; 31-38
Compartir
Altmétricas