Effects of processing parameters on physical properties of corn starch extrudates expanded using supercritical CO2 injection

Eun Yong Lee, Gi Hyung Ryu, Seung Taik Lim

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41 Citations (Scopus)

Abstract

Corn starch was extruded with a corotating twin-screw extruder (24:1 L/D ratio, 31-mm screw diameter) and supercritical CO2 was injected as a blowing agent. The effects of barrel temperature (80-90°C), screw speed (150-250 rpm), and water injection (30-54 g/min) on specific mechanical energy (SME) input for the process and the physical properties of extrudates, such as expansion ratio, water absorption (WA), water solubility (WS), breaking stress, and elastic modulus, were examined using a response surface methodology. Barrel temperature had the greatest effect on physical properties of extrudates but not on SME input, whereas screw speed and water injection had significant effects on SME input. Extradates had a smooth surface, and air cells were uniform and closed, providing low WA and WS. Using superimposed contour plots, optimum barrel temperature, screw speed, and water injection rate, based on maximum expansion ratio and minimum SME input, were 94-96°C, 155-175 rpm, and 36-39 g/min, respectively.

Original languageEnglish
Pages (from-to)63-69
Number of pages7
JournalCereal Chemistry
Volume76
Issue number1
DOIs
Publication statusPublished - 1999

ASJC Scopus subject areas

  • Food Science
  • Organic Chemistry

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