Consulta: creatorFacets:"Grossmann,Maria Victória Eiras"
Registros recuperados: 6
Data/hora: 09/06/2024 04:35:48

Influence of thickness on properties of plasticized oat starch films
Provedor de dados: 52
Autores: Galdeano,Melicia Cintia; Wilhelm,Allan Eduardo; Mali,Suzana; Grossmann,Maria Victória Eiras.
The aim of this study was to investigate the effect of thickness (between 80 and 120 µm) on apparent opacity, water vapor permeability and mechanical properties (tensile and puncture) of oat starch films plasticized with glycerol, sorbitol, glycerol:sorbitol mixture, urea and sucrose. Films were stored under 11, 57, 76 and 90% relative humidity (RH) to study the mechanical properties. It was observed that the higher the thickness, the higher was the opacity values. Films without the plasticizer were more opaque in comparison with the plasticized ones. Glycerol:sorbitol films presented increased elongation with increasing thickness at all RH. Puncture force showed a strong dependence on the film thickness, except for the films plasticized with sucrose. In...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Plasticizers; Tensile; Puncture; Permeability; Opacity; Glycerol.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132013000400014

Effect of treatment with alkaline hydrogen peroxide associated with extrusion on color and hydration properties of oat hulls
Provedor de dados: 52
Autores: Galdeano,Melicia Cintia; Grossmann,Maria Victória Eiras.
An incomplete factorial design with three independent variables at three levels of variation was used to evaluate the effect of the treatment with alkaline hydrogen peroxide concomitant with extrusion on some properties of oat hulls. The independent variables were hydrogen peroxide level, feed moisture and extrusion temperature. The dependent variables were water retention capacity (WRC), swollen volume (SV) and color. The analysis of variance showed that temperature was the most important variable for the hydration properties. The highest values of WRC and SV were obtained when oat hulls were processed in the condition of 7% hydrogen peroxide, 32% feed moisture and 90ºC extrusion temperature. Modified hulls had a WRC 70% higher and SV 55% higher than the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Dietary fiber; Oat hulls; Chemical modification; Functional properties.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132005000100010

Effect of relative humidities on microstructural, barrier and mechanical properties of Yam starch-monoglyceride films
Provedor de dados: 52
Autores: Ferreira,Fábio Avelino Bublitz; Grossmann,Maria Victória Eiras; Mali,Suzana; Yamashita,Fábio; Cardoso,Lisandro Pavie.
The effect of monoglyceride on microstructural, barrier and mechanical properties of casted yam starch films were investigated in different relative humidities (RH) and compared with glycerol-starch films. A single screw extruder was used to produce the starch - monoglyceride complex before film production and this process was effective to inhibit the phase separation in films. The addition of the hydrophobic compound reduced hydrophobicity, transparency and water vapor permeability of films. This later value for starch-glycerol film (1.7 x 10-10 g Pa-1 s-1 m-1) was higher than starch (1.2 x 10-10 g Pa-1 s-1 m-1) and monoglyceride-starch films (1.0 x 10-10 g Pa-1 s-1 m-1). Films containing glycerol had higher relative crystallinity (B and V H) with a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biodegradable films; Hydrophilicityandglycerol-monoestearate.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132009000600022

Properties of extruded xanthan-starch-clay nanocomposite films
Provedor de dados: 52
Autores: Melo,Cristina de; Garcia,Patrícia Salomão; Grossmann,Maria Victória Eiras; Yamashita,Fábio; Dall'Antônia,Luiz Henrique; Mali,Suzana.
The aim of this work was to manufacture the biodegradable nanocomposite films by extrusion from different combinations of cassava starch, xanthan gum and nanoclays (sodium montmorillonite - MMT- Na) and to characterize them according to their microstructure, optical, mechanical and barrier properties. Films were manufactured from nine starch/xanthan/nanoclay combinations, containing glycerol as plasticizer. Scanning electron microscopy (SEM) of the starch-xanthan extruded films showed reticulated surface and smooth interior, indicating that the gum was mostly concentrated on the surface of the films, while starch/xanthan/nanoclays films showed a more homogeneous surface, suggesting that the introduction of nanoclays provided a better biopolymeric...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Film blowing; Cassava starch; Microstructure; Mechanical properties; Water vapor permeability.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132011000600019

Biodegradable foams based on starch, polyvinyl alcohol, chitosan and sugarcane fibers obtained by extrusion
Provedor de dados: 52
Autores: Debiagi,Flávia; Mali,Suzana; Grossmann,Maria Victória Eiras; Yamashita,Fábio.
Biodegradable foams made from cassava starch, polyvinyl alcohol (PVA), sugarcane bagasse fibers and chitosan were obtained by extrusion. The composites were prepared with formulations determined by a constrained ternary mixtures experimental design, using as variables: (X1) starch / PVA (100 - 70%), (X2) chitosan (0 - 2%) and (X3) fibers from sugar cane (0 - 28%). The effects of varying proportions of these three components on foam properties were studied, as well the relationship between their properties and foam microstructure. The addition of starch/PVA in high proportions increased the expansion index and mechanical resistance of studied foams. Fibers addition improved the expansion and mechanical properties of the foams. There was a trend of red and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cassava starch; Mechanical properties; Microstructure; Expansion.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132011000500023

Efeito de fibras vegetais nas propriedades de compósitos biodegradáveis de amido de mandioca produzidos via extrusão
Provedor de dados: 64
Autores: Debiagi,Flávia; Mali,Suzana; Grossmann,Maria Victória Eiras; Yamashita,Fábio.
A preocupação com o volume de lixo tem gerado interesse no desenvolvimento de embalagens biodegradáveis capazes de substituir, ao menos em parte, os plásticos convencionais sintéticos, como é o caso das embalagens de poliestireno expandido (Isopor). Ojvetivou-se,neste trabalho caracterizar, quanto ao índice de expansão (IE), densidade, índice de absorção em água (IAA), índice de solubilidade em água (ISA) e cor (coordenadas L*, a* e b*), compósitos biodegradáveis expandidos produzidos via extrusão, a partir da mistura de amido de mandioca, glicerol (plastificante) e dois tipos de fibras vegetais. Os compósitos foram preparados em extrusora mono-rosca, com três diferentes teores de fibras de aveia ou de cana-de-açúcar (0, 5 e 10 g/100 g amido), dois teores...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Embalagens de alimentos; Fibras da cana-de-açúcar; Fibras da casca de aveia.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542010000600024