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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 ΔC p 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. © 2019


Documento: Artículo
Título:About the endothermal transitions of galactomannans: A multi-analytical DSC, LF- 1 H NMR and DMA study
Autor:Busch, V.M.; Santagapita, P.R.; Díaz-Calderón, P.; Enrione, J.I.; Buera, M.P.
Filiación:Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamentos de Industrias y Química Orgánica, Int. Güiraldes 2160, Buenos Aires, CP 1428, Argentina
CONICET-Universidad de Buenos Aires. Instituto de Tecnología de Alimentos y Procesos Químicos (ITAPROQ), Int. Güiraldes 2160, Buenos Aires, CP 1428, Argentina
Biopolymer Research and Engineering Lab (BiopREL), Universidad de los Andes, Avenida Monseñor Alvaro del Portillo 12455, Las Condes, Santiago 7550000, Chile
Palabras clave:Biopolymer; Differential scanning calorimetry; Dynamic mechanical analysis; Enthalpic relaxation; Galactomannan (PubChem CID: 439336); Guar gum; Guar gum (PubChem CID: 44134661); Low field 1H NMR; Biomolecules; Biopolymers; Differential scanning calorimetry; Dynamic mechanical analysis; Enthalpic relaxation; Guar gums; Low field; Operational applications; Proton mobility; Pubchem; Structure development; Thermal transitions; Glass transition
Página de inicio:31
Página de fin:38
Título revista:Carbohydrate Polymers
Título revista abreviado:Carbohydr Polym


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---------- APA ----------
Busch, V.M., Santagapita, P.R., Díaz-Calderón, P., Enrione, J.I. & Buera, M.P. (2019) . About the endothermal transitions of galactomannans: A multi-analytical DSC, LF- 1 H NMR and DMA study. Carbohydrate Polymers, 211, 31-38.
---------- CHICAGO ----------
Busch, V.M., Santagapita, P.R., Díaz-Calderón, P., Enrione, J.I., Buera, M.P. "About the endothermal transitions of galactomannans: A multi-analytical DSC, LF- 1 H NMR and DMA study" . Carbohydrate Polymers 211 (2019) : 31-38.
---------- MLA ----------
Busch, V.M., Santagapita, P.R., Díaz-Calderón, P., Enrione, J.I., Buera, M.P. "About the endothermal transitions of galactomannans: A multi-analytical DSC, LF- 1 H NMR and DMA study" . Carbohydrate Polymers, vol. 211, 2019, pp. 31-38.
---------- VANCOUVER ----------
Busch, V.M., Santagapita, P.R., Díaz-Calderón, P., Enrione, J.I., Buera, M.P. About the endothermal transitions of galactomannans: A multi-analytical DSC, LF- 1 H NMR and DMA study. Carbohydr Polym. 2019;211:31-38.