Abstract
Native starch was extracted from nine germplasm collections of Araucaria angustifolia seeds in aqueous medium and they were characterized by Pasting Properties (RVA), X-ray Powder Diffractometry (XRD) and Scanning Electron Microscopy (SEM). The gelatinization process of each sample was evaluated at different ratios of starch:water by Differential Scanning Calorimetry (DSC). A slight displacement in the gelatinization curves was observed for the pinhão starches prepared with different amounts of water. With an increase in water content, most of the samples presented a decrease in the peak, the conclusion temperatures, and the range of gelatinization temperatures, while the enthalpy did not follow a standard behavior. A displacement or a narrowing of the gelatinization temperature range occurred with increasing water content. Pinhão starch showed pasting temperature in the range of 60-67 °C and there were differences in the pasting properties and degree of relative crystallinity between the analyzed samples. The C-type diffraction pattern was found for all the samples and the morphology of starch granules was similar, with oval and round shapes. Therefore, different characteristics were found among starches from nine germplasm collections, encouraging the protection of the biological diversity of selected species, aiming at future applications.
Highlights
Starch, among the carbohydrates, is one of the most abundant renewable sources, widely used for industrial purposes due to its physicochemical properties and low cost
Heating of starch in the presence of water leads to an irreversible transformation known as gelatinization, which is characteristic of the botanical origin and molecular composition of each starch
Other values of Tp from gelatinization of pinhao starch reported in the literature were: 66.65 (Pinto et al, 2012), 62.44 (Ribeiro et al, 2014), 55.55 (Daudt et al, 2014), 63.4
Summary
Among the carbohydrates, is one of the most abundant renewable sources, widely used for industrial purposes due to its physicochemical properties and low cost. The main economic sources of starches are plants, in which this biopolymer occurs in various sites (cereal grains, seeds, roots and tubers, stems, etc.) as tiny white granules. They may present an oval, spherical, round, polygonal or lenticular shape, with a diameter range of
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