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Title: Multiple optimization of chemical and textural properties of roasted expanded purple maize using response surface methodology
Authors: Mrad, Rachelle
Debs, Esperance 
Saliba, Rachad
Maroun, Richard G.
Louka, Nicolas
Affiliations: Department of Biology 
Keywords: Intensification of Vaporization by Decompression to the Vacuum
Purple maize
Issue Date: 2014
Part of: Journal of cereal science
Volume: 60
Issue: 2
Start page: 397
End page: 405
Intensification of Vaporization by Decompression to the Vacuum is a new texturizing process proposed as a pre-treatment for roasting purple maize. It consists in exposing humid kernels to a high steam pressure followed by a decompression to the vacuum. Three variables were considered: initial water content (W), steam pressure (P) and processing time (T). Using response surface methodology, the effects of these variables were studied on the response parameters: Total Anthocyanins Content, Total Polyphenols Content, Free Radical Scavenging Activity, Expansion Ratio, Hardness and Work Done. P and T had the highest effects. They decreased anthocyanins and polyphenols content but increased Expansion Ratio, Hardness and Work Done. Interactions between the variables had interesting effects on texturization as crunchiness, popping or shrinkage. Multiple optimization was conducted in order to find a compromise between chemical and textural parameters. The optimum (W = 30%, P = 7 bar, T = 10 s) conserved the phenolic compounds while conferring expansion and crunchiness.
DOI: 10.1016/j.jcs.2014.05.005
Ezproxy URL: Link to full text
Type: Journal Article
Appears in Collections:Department of Biology

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