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Hornung, Polyanna Silveira; do Prado Cordoba, Layse; da Silveira Lazzarotto, Simone Rosa; Schnitzler, Egon; Lazzarotto, Marcelo; Ribani, Rosemary Hoffmann
Journal of thermal analysis and calorimetry, 03/2017, Letnik: 127, Številka: 3Journal Article
Determination of the characteristics of native starches is crucial in order to select their best application in various industrial fields. Thus, two different types of non-traditional native starches from the Dioscoreaceas species ( Dioscorea sp. and Dioscorea piperifolia Humb. var. Wild) were studied regarding their thermal, structural and rheological properties. The results were contrasted with traditional commercial starch sources (potato, cassava and corn). From the thermogravimetric results (TG/DTG), D. piperifolia starch obtained the highest thermal stability of the samples, except for potato starch. Furthermore, using differential scanning calorimetry and viscoamylograph profiles (RVA), it was found that the Dioscoreaceas starches presented a higher onset ( T o ) temperature and susceptibility to retrogradation. They also showed lower values in relation to relative crystallinity, which was calculated from their X-ray patterns and tendency to white ( L *) colour. The shapes of the Discoreaceas starch granules were determined using electron microscopy; it was found that as the potato starch the Dioscoreaceas starches showed a wide range of particle size.
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in: SICRIS
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