02139naa a2200301 a 450000100080000000500110000800800410001902400350006010000190009524501410011426000090025552011750026465000110143965000100145065000270146065300270148765300250151465300260153965300300156565300260159565300220162170000220164370000280166570000190169370000190171270000180173177300880174920703042017-11-23       2017    bl uuuu     u00u1 u    #d7 a10.1007/s10973-016-5747-52DOI1 aHORNUNG, P. S.  aBrazilian dioscoreaceas starchesbthermal, structural and rheological properties compared to commercial starches.h[electronic resource]  c2017  aDetermination of the characteristics of native starches is crucial in order to select their best application in various industrial fields. Thus, two different types of nontraditional 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 (To) 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.  aStarch  aAmido  aPropriedade reológica  aPropriedade estrutural  aPropriedade térmica  aRheological behaviour  aThermogravimetric profile  aUnusual starch source  aYam native starch1 aCORDOBA, L. do P.1 aLAZZAROTTO, S. R. da S.1 aSCHNITZLER, E.1 aLAZZAROTTO, M.1 aRIBANI, R. H.  tJournal of Thermal Analysis and Calorimetrygv. 127, n. 3, p. 1869-1877, Mar. 2017.