RT info:eu-repo/semantics/article
T1 Ultrasound treatments of tef [Eragrostis tef (Zucc.) Trotter] flour rupture starch α-(1,4) bonds and fragment amylose with modification of gelatinization properties
A1 Vela Corona, Antonio José
A1 Villanueva Barrero, Marina
A1 Li, Cheng
A1 Hamaker, Bruce R.
A1 Ronda Balbás, María Felicidad
K1 Tef flour physical modification
K1 Ultrasound treatment
K1 Thermal properties
K1 Structural properties
K1 Size-exclusion chromatography
K1 23 Química
K1 2302 Bioquímica
AB Tef is a nutritionally-rich ancient grain gaining increasing interest in gluten-free market. Molecular and structural properties in the main biopolymers of two Spanish ecotypes of tef flour physically modified by ultrasound (US) treatments under different temperatures (20, 40, 45, 50 and 55 °C) were studied. Modifications achieved were dependent on tef ecotype, where white tef presented higher susceptibility. Size-exclusion chromatography indicated higher proportion of intermediate amylose chains (degree of polymerization 300–1600) across the whole amylose chain-length distribution and a higher amylose/amylopectin ratio, that increased up to 23% and 19% in treated samples of white and brown tef respectively. US increased the starch short-range order crystallinity and promoted the formation of random coil protein structure and the disappearance of β-sheet, as confirmed from FTIR spectroscopy. XRD and 1H NMR revealed a higher fragmentation of α-(1,4) than α-(1,6) bonds due ultrasonication. The gelatinization temperature range and ΔHgel decreased after ultrasonication up to 6 °C and 13%, an effect that was reinforced or counteracted, respectively, by the treatment temperature, indicating that annealing modulates the impact of sonication on flour gelatinization properties. Tef starch structural properties were found to be significantly modified by US treatments, where temperature was a determining variable influencing the degree of modification achieved.
PB Elsevier
SN 0023-6438
YR 2023
FD 2023
LK https://uvadoc.uva.es/handle/10324/58291
UL https://uvadoc.uva.es/handle/10324/58291
LA eng
NO LWT, 2023, vol. 174, p. 114463
NO Producción Científica
DS UVaDOC
RD 23-nov-2024