Related Experiment Video
Updated: Jan 28, 2026

A Package of Established Analytical Tools to Investigate the Solid-State Alteration of Lipid-Based Excipients
Published on: August 9, 2022
About the endothermal transitions of galactomannans: A multi-analytical DSC, LF-1H NMR and DMA study
Verónica M Busch1, Patricio R Santagapita1, Paulo Díaz-Calderón2
1Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamentos de Industrias y Química Orgánica, Int. Güiraldes 2160, CP 1428, Buenos Aires, Argentina; CONICET-Universidad de Buenos Aires. Instituto de Tecnología de Alimentos y Procesos Químicos (ITAPROQ), Int. Güiraldes 2160, CP 1428, Buenos Aires, Argentina.
Abstract:
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-1H 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.
More Related Videos
06:23Preparation of DMMTAV and DMDTAV Using DMAV for Environmental Applications: Synthesis, Purification, and Confirmation
Published on: March 9, 2018
09:15Measuring Biomolecular DSC Profiles with Thermolabile Ligands to Rapidly Characterize Folding and Binding Interactions
Published on: November 21, 2017
Related Concept Videos
Phase Transitions
Phase Transitions: Vaporization and Condensation
Phase Transitions: Sublimation and Deposition
Phase Transitions: Melting and Freezing
Properties of Transition Metals
Cooperative Allosteric Transitions