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.
Bibliographical noteFunding Information:
The authors are grateful to ANPCyT (PICT 2013 1331), Universidad de Buenos Aires (UBACyT 2020170100459BA), FONDECYT Nº 1171553 and PDTS CIN-CONICET0196.
- Differential scanning calorimetry
- Dynamic mechanical analysis
- Enthalpic relaxation
- Galactomannan (PubChem CID: 439336)
- Guar gum
- Guar gum (PubChem CID: 44134661)
- Low field 1H NMR