RT info:eu-repo/semantics/article
T1 Impact of microwave radiation on in vitro starch digestibility, structural and thermal properties of rice flour: From dry to wet treatments
A1 García Solaesa, Ángela
A1 Villanueva Barrero, Marina
A1 Vela Corona, Antonio José
A1 Ronda Balbás, María Felicidad
K1 Rice flour microwave treatment
K1 In vitro starch digestibility
K1 Structural properties
K1 3309 Tecnología de Los Alimentos
K1 2302.90 Bioquímica de Alimentos
AB Microwave radiation (MW) is an environment-friendly technology used to physically modify flours. Rice flour was MW-treated at different moisture content (MC) (3 %, 8 %, 13 %, 15 %, 20 % and 30 %). In vitro starch digestibility was determined and related to the changes caused by MW treatment to flours' structure and thermal properties, which were influenced by MC. A reduction of 49 % and 65 % in the gelatinization enthalpy of samples treated at 20 % and 30 % MC denoted a partial gelatinization. A loss of granular crystallinity in treated samples was confirmed by XR-diffraction and FTIR, particularly at 15 %, 20 % and 30 % MC. MW promoted the formation of random-coil, α-helix and β-turn protein structure, and the disappearance of LF-β-sheet. Morphological differences were found between samples treated at 8 % MC (loss of polygonal structure, protein layer covering granules' surface and small holes) and 30 % MC (rounded and aggregated granules, covered with exudate amylose). In vitro starch digestibility revealed that samples treated at 20 % and 30 % MC showed 40 % and 47 % higher rapidly digestible starch, 48 % and 70 % lower slowly digestible starch and 90 % lower resistant starch than the untreated flour. Flour MC in MW-treatment allowed the modulation of structural and thermal characteristics of rice flour and consequently its starch hydrolysis rate.
PB Elsevier
SN 0141-8130
YR 2022
FD 2022
LK https://uvadoc.uva.es/handle/10324/61900
UL https://uvadoc.uva.es/handle/10324/61900
LA eng
NO International Journal of Biological Macromolecules, 2022, vol. 222, 1768-1777
NO Producción Científica
DS UVaDOC
RD 23-nov-2024