title: Starch digestibility and molecular weight distribution of proteins in rice grains subjected to heat-moisture treatment.
abstract: The objective of this study was to evaluate the effects of the heat-moisture treatment (HMT) applied to paddy rice grains on the physicochemical properties, in vitro starch digestibility, and molecular weight distribution of proteins in rice flour. The paddy rice grains were adjusted to 13%, 16%, and 18% moisture and autoclaved at 121°C for 30 and 60min. The HMT promoted a reduction of the amylose content, the swelling power, and the solubility of the rice flour. Changes in the relative crystallinity and molecular weight of the proteins extracted with a sodium phosphate buffer containing 2.0% sodium dodecyl sulfate (SDDS) were observed in HMT samples. The different methods for the quantification of resistant starch resulted in distinct resistant starch contents. The HMT (18%-60min) promoted an increase in resistant starch content and the HMT (16%-60min) caused an increase in the slowly digestible starch in the rice flour.
authors.affiliation: Departamento de Ciência e Tecnologia Agroindustrial, Universidade Federal de Pelotas, Pelotas, RS 96010-900, Brazil. Electronic address: wyller_m@hotmail.com.
authors.forename: Wyller Max Ferreira
authors.initials: WM
authors.lastname: Silva
authors.affiliation: Departamento de Ciência e Tecnologia Agroindustrial, Universidade Federal de Pelotas, Pelotas, RS 96010-900, Brazil. Electronic address: babi_biduski@hotmail.com.
authors.forename: Bárbara
authors.initials: B
authors.lastname: Biduski
authors.affiliation: Departamento de Ciência e Tecnologia Agroindustrial, Universidade Federal de Pelotas, Pelotas, RS 96010-900, Brazil. Electronic address: karinah_ol@hotmail.com.
authors.forename: Karina Oliveira
authors.initials: KO
authors.lastname: Lima
authors.affiliation: Departamento de Ciência e Tecnologia Agroindustrial, Universidade Federal de Pelotas, Pelotas, RS 96010-900, Brazil; Curso de Engenharia de Alimentos, Universidade Federal da Fronteira Sul, Laranjeiras do Sul, PR 85.301-970, Brazil. Electronic address: vania_vzp@hotmail.com.
authors.forename: Vânia Zanella
authors.initials: VZ
authors.lastname: Pinto
authors.affiliation: Departamento de Ciência e Tecnologia Agroindustrial, Universidade Federal de Pelotas, Pelotas, RS 96010-900, Brazil. Electronic address: jessicafh91@hotmail.com.
authors.forename: Jéssica Fernanda
authors.initials: JF
authors.lastname: Hoffmann
authors.affiliation: Departamento de Ciência e Tecnologia Agroindustrial, Universidade Federal de Pelotas, Pelotas, RS 96010-900, Brazil. Electronic address: nathanvanier@hotmail.com.
authors.forename: Nathan Levien
authors.initials: NL
authors.lastname: Vanier
authors.affiliation: Departamento de Ciência e Tecnologia Agroindustrial, Universidade Federal de Pelotas, Pelotas, RS 96010-900, Brazil. Electronic address: alvaro.guerradias@gmail.com.
authors.forename: Alvaro Renato Guerra
authors.initials: AR
authors.lastname: Dias
mesh_terms: D008970:Molecular Weight; D012275:Oryza / Q000737:chemistry*; D013213:Starch / Q000737:chemistry*
chemical_list: D013213:Starch
keywords: Heat-moisture treatment; Proteins; Resistant starch; Rice flour