Erschienen: 20.02.2012 Abbildung von Robin | Effect of wheat bran on the expansion and mechanical properties of extruded plasticized starchy foams | 2012

Robin

Effect of wheat bran on the expansion and mechanical properties of extruded plasticized starchy foams

lieferbar, ca. 10 Tage

2012. Buch. 180 S. Softcover

Logos. ISBN 978-3-8325-3078-5

Format (B x L): 14,5 x 21 cm

In englischer Sprache

Produktbeschreibung

Wheat bran, a readily available and low cost by-product, contains a high amount of dietary fibers reported to deliver nutritional and health benefits. Understanding and controlling its effect on extruded cereals properties is of key importance to optimize its use.

Increasing the bran content in extruded wheat flour reduces the volumetric and sectional expansion while the longitudinal expansion is increased. Samples enriched with bran show a cellular structure with a higher number of small cells compared to the control flour. At same porosities, the formation of these finer cellular structures with bran leads to samples with a higher breaking strength. The decrease in volumetric expansion with bran can be associated to an increase in the shear viscosity of the melt but only at high bran content. This increase in shear viscosity of the melt may hinder the bubble growth at the die exit. At lower bran content, the decrease in expansion volumes can be explained by the lower extensional capacity of the membrane surrounding the bubble during its growth. The increased surface porosity of the samples with bran addition indicates an early burst of the bubbles at the die exit, limiting their size in the final product. This can be explained by the low adhesion properties between bran particles and starch at their interface.

Gesamtwerk

Die 8. Auflage ist wieder auf sechs Bände angelegt. Darin finden sich übersichtlich und in systematischer Gliederung Vertragsmuster aus der Feder erfahrener Experten. Jedem dieser Muster folgen Anmerkungen, mit denen der dem Vertragsentwurf zu Grunde liegende Sachverhalt und die Gründe für die Wahl des spezifischen Formulars erläutert werden.

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