Rheological and biochemical properties of Solanum lycocarpum starch
Maria Carolina B Di-Medeiros1, Aline M Pascoal2, Karla A Batista1
1Laboratório de Química de Proteínas, Departamento de Bioquímica e Biologia Molecular, Instituto de Ciências Biológicas - ICB II, Universidade Federal de Goiás, PB 131, Goiânia, GO, Brazil.
Abstract:
This study was conducted to evaluate the rheological and physicochemical properties of Solanum lycocarpum starch. The thermogravimetric analysis of S. lycocarpum starch showed a typical three-step weight loss pattern. Microscopy revealed significant changes in the granule morphology after hydrothermal treatment. Samples hydrothermally treated at 50°C for 10 min lost 52% of their crystallinity, which was recovered after storage for 7 days at 4°C. However, samples hydrothermally treated at 65°C were totally amorphous. This treatment was sufficient to completely disrupt the starch granule, as evidenced by the absence of an endothermic peak in the DSC thermogram. The RVA of S. lycocarpum starch revealed 4440.7cP peak viscosity, 2660.5cP breakdown viscosity, 2414.1cP final viscosity, 834.3cP setback viscosity, and a pasting temperature of 49.6°C. The low content of resistant starch (10.25%) and high content of digestible starch (89.78%) in S. lycocarpum suggest that this starch may be a good source for the production of hydrolysates, such as glucose syrup and its derivatives.
Related Concept Videos
Chemistry of Carbohydrates
Production of Organic Acids
Physical Properties Affecting Solubility
As for any solution, the solubility of a gas in a liquid is affected by the attractive intermolecular forces between solute and solvent species. Unlike solid and liquid solutes, however, there is no solute-solute intermolecular attraction to overcome when a gaseous solute dissolves in a liquid solvent since the atoms or molecules comprising a gas are far separated and experience negligible interactions. Consequently, solute-solvent interactions are the sole...
Polymer Classification: Stereospecificity
Problem Solving on Stress and Strain
Cellulose and Pectic Polysaccharides
As a cell matures, its cell wall specializes according to its type. For example, the...


