Maranta (Maranta arundinaceaL) can be considered as a non-conventional raw material for starch. The objective of this work was to characterize the maranta starch. These starch granules had spherical and elongated geometries with average size of 56.60 μm. The maranta starch presented B-type crystal, revealed by x-ray spectra, and gelatinization temperature of 65.5°C as determined by thermal (DSC) analysis. Maranta starch suspensions have a pseudoplastic behavior which was well described using a power law model. Storage and loss moduli increased drastically during gelatinization process, corroborating with DSC results. In general, maranta starch could have numerous food industrial applications.
To characterize the flour and starch from peach palm fruit, a non-conventional raw material, these powders were studied by means of chemical composition, SEM, particle size analyzer, XRD, FTIR, and differential scanning calorimeter, with different water contents. The rheological properties of the solutions and suspensions also were evaluated. Results showed that flour and starch powders have high starch contents (between 73.0 and 84.5%) with average particle size between 9.8 mm (flour) and 8.4 mm (starch). Thermograms revealed endothermic peaks that were affected by hydration conditions between 70-72°C for flour and 61-62°C for starch. Solutions of peach palm fruit flour and starch had a pseudoplastic behavior at 30°C that can be fit well to the power-law model. Peach palm fruit is a non-conventional source of flour and starch, but the results proved that these powders could have promising industrial applications, due to their physicochemical properties being similar to those reported for other starches.
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