Altogether, there is a lack of understanding regarding the
influence of DG on expansion. The studies described were
mostly focused on total volume expansion under atmospheric
pressure without analyzing the pore structure of the
final products in detail. However, for a more detailed understanding
of the expansion, it is important to analyze the inner
structure of the final products. As an example for the expansion
of snack foods, this paper deals with the microwaveinduced
expansion of extruded, starch-based intermediate
products under vacuum. DG and the viscoelastic properties
of the intermediate product were observed in relation to final
product characteristics. Hence, we analyzed the relative
impact of DG and viscoelasticity on nucleation and bubble
growth. Because it is not possible to measure the viscoelastic
properties during the expansion process, rheological data are
recorded under simulated process conditions and are compared
qualitatively. The objectives of our study were to investigate
the influence of DG on (1) viscoelastic properties of the
intermediate product; (2) volume expansion; (3) number of
pores created per square millimeter of a cross-sectional area
of the pellets; (4) pore size distribution; and (5) appearance
of the pellets.
Altogether, there is a lack of understanding regarding theinfluence of DG on expansion. The studies described weremostly focused on total volume expansion under atmosphericpressure without analyzing the pore structure of thefinal products in detail. However, for a more detailed understandingof the expansion, it is important to analyze the innerstructure of the final products. As an example for the expansionof snack foods, this paper deals with the microwaveinducedexpansion of extruded, starch-based intermediateproducts under vacuum. DG and the viscoelastic propertiesof the intermediate product were observed in relation to finalproduct characteristics. Hence, we analyzed the relativeimpact of DG and viscoelasticity on nucleation and bubblegrowth. Because it is not possible to measure the viscoelasticproperties during the expansion process, rheological data arerecorded under simulated process conditions and are comparedqualitatively. The objectives of our study were to investigatethe influence of DG on (1) viscoelastic properties of theintermediate product; (2) volume expansion; (3) number ofpores created per square millimeter of a cross-sectional areaof the pellets; (4) pore size distribution; and (5) appearanceof the pellets.
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