The technique of foaming has proved effective in creating a porous structure, which is an important
requirement for crisp food. Foam density and the type of foaming agent indeed play a key role in
determining the drying kinetics and textural property of the foamed food. The influences of the foam
density and the types of foaming agents on the moisture diffusivity as well as the quality in terms of
microstructure, texture and volatile losses of banana foams were therefore investigated. Three foaming
agents, i.e., fresh egg albumen (EA), soy protein isolate (SPI) and whey protein concentrate (WPC) were
used. The experimental results showed that WPC banana foam could retain more open structure during
drying. This morphology provided less shrinkage and led to higher values of the effective diffusivity as
compared with that of SPI and EA banana foams. In terms of the textural properties, WPC and EA banana
foams were spongy and less crisp than SPI banana foam. Samples with lower foam densities exhibited
higher values of the effective diffusivity, smaller hardness and lower crispness than those with higher
foam densities. The losses of volatile substances were substantial during all processing steps, but the
major losses were during the foaming step.
The technique of foaming has proved effective in creating a porous structure, which is an importantrequirement for crisp food. Foam density and the type of foaming agent indeed play a key role indetermining the drying kinetics and textural property of the foamed food. The influences of the foamdensity and the types of foaming agents on the moisture diffusivity as well as the quality in terms ofmicrostructure, texture and volatile losses of banana foams were therefore investigated. Three foamingagents, i.e., fresh egg albumen (EA), soy protein isolate (SPI) and whey protein concentrate (WPC) wereused. The experimental results showed that WPC banana foam could retain more open structure duringdrying. This morphology provided less shrinkage and led to higher values of the effective diffusivity ascompared with that of SPI and EA banana foams. In terms of the textural properties, WPC and EA bananafoams were spongy and less crisp than SPI banana foam. Samples with lower foam densities exhibitedhigher values of the effective diffusivity, smaller hardness and lower crispness than those with higherfoam densities. The losses of volatile substances were substantial during all processing steps, but themajor losses were during the foaming step.
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