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Effect of drying temperatures on starch-related functional and thermal properties of acorn flours
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Orientador(es)
Resumo(s)
Abstract: The application of starchy flours from different origins in food systems depends greatly on information about
the chemical and functional properties of such food materials. Acorns are important forestry resources in the central and
southern regions of Portugal. To preserve these fruits and to optimize their use, techniques like drying are needed. The
effects of different drying temperatures on starch-related functional properties of acorn flours obtained from dried fruits
of Quercus rotundifolia (QR) and Quercus suber (QS) were evaluated. Flours were characterized for amylose and resistant
starch (RS) contents, swelling ability, and gelatinization properties. Drying temperature mainly affected amylose content
and viscoamylographic properties. Amylograms of flours from fruits dried at 60 ◦C displayed higher consistency (2102
B.U. and 1560 B.U., respectively, for QR and QS). The transition temperatures and enthalpy were less affected by drying
temperature, suggesting few modifications in starch structure during drying. QR flours presented different functional
properties to those obtained from QS acorn flours. The effect of drying temperatures were more evident in QR.
Descrição
Palavras-chave
acorn flours drying functional properties starch thermal analysis
Contexto Educativo
Citação
"Journal of Food Science". ISSN 1750-3841. 76(2) (2011) E196-E202