About the endothermal transitions of galactomannans: A multi-analytical DSC, LF- 1 H NMR and DMA study
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 compar...
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2019
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01448617_v211_n_p31_Busch http://hdl.handle.net/20.500.12110/paper_01448617_v211_n_p31_Busch |
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paper:paper_01448617_v211_n_p31_Busch2023-06-08T15:12:06Z About the endothermal transitions of galactomannans: A multi-analytical DSC, LF- 1 H NMR and DMA study 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 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 2019 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01448617_v211_n_p31_Busch http://hdl.handle.net/20.500.12110/paper_01448617_v211_n_p31_Busch |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
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 |
| spellingShingle |
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 About the endothermal transitions of galactomannans: A multi-analytical DSC, LF- 1 H NMR and DMA study |
| topic_facet |
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 |
| description |
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 |
| title |
About the endothermal transitions of galactomannans: A multi-analytical DSC, LF- 1 H NMR and DMA study |
| title_short |
About the endothermal transitions of galactomannans: A multi-analytical DSC, LF- 1 H NMR and DMA study |
| title_full |
About the endothermal transitions of galactomannans: A multi-analytical DSC, LF- 1 H NMR and DMA study |
| title_fullStr |
About the endothermal transitions of galactomannans: A multi-analytical DSC, LF- 1 H NMR and DMA study |
| title_full_unstemmed |
About the endothermal transitions of galactomannans: A multi-analytical DSC, LF- 1 H NMR and DMA study |
| title_sort |
about the endothermal transitions of galactomannans: a multi-analytical dsc, lf- 1 h nmr and dma study |
| publishDate |
2019 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01448617_v211_n_p31_Busch http://hdl.handle.net/20.500.12110/paper_01448617_v211_n_p31_Busch |
| _version_ |
1768545548680298496 |