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Provedor de dados:  116
País:  Brazil
Título:  Retrogradation of heat-gelatinized rice grain in sealed packaging: investigation of moisture relocation
Autores:  JUNG,Kyung-jin
LEE,Hyunah
LEE,Sang Hyun
KIM,Jae Cherl
Data:  2017-03-01
Ano:  2017
Palavras-chave:  Rice grain
Starch
Gelatinization
Retrogradation
Texture
Structure
Resumo:  Abstract The aggregation of water molecules inside heat-gelatinized rice grain due to retrogradation of the grain was investigated by textural change and scanning electron microscopy (SEM) analysis of cooked grains after storage at 11 °C in a sealed package. Relaxation tests using a disc-type tip showed an increase in hardness (strength) of the cooked grain as the degree of retrogradation increased with increasing storage time, measured by the α-amylase–iodine method. SEM analysis of the vacuum-dried cooked rice grain showed a gradual increase in crevices, which further developed into holes at the center of the granule with increasing storage time. The results suggest that the disruption of hydrogen bonds between water and starch molecules is the first step for the retrogradation of gelatinized rice grain stored in a hermetic environment to avoid drying, resulting in its increased hardness, followed by the aggregation of starch molecules with subsequent water extrusion.
Tipo:  Info:eu-repo/semantics/article
Idioma:  Inglês
Identificador:  http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20612017000100097
Editor:  Sociedade Brasileira de Ciência e Tecnologia de Alimentos
Relação:  10.1590/1678-457x.07816
Formato:  text/html
Fonte:  Food Science and Technology v.37 n.1 2017
Direitos:  info:eu-repo/semantics/openAccess
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