Effects of extrusion conditions on physical and nutritional properties of extruded whole grain red sorghum (sorghum spp)

Int J Food Sci Nutr. 2014 Feb;65(1):34-41. doi: 10.3109/09637486.2013.836737. Epub 2013 Sep 24.

Abstract

In order to analyze the effects of extrusion temperature (T: 164, 182, 200 °C) and grits moisture content (g/100 g sample) (%M: 14, 16.5, 19) on textural and physicochemical properties of red sorghum extrudates, whole grain flour was extruded according to a factorial experimental design. The higher values for specific mechanical energy consumption (1006.98 J/g) and expansion (3.36) were obtained at 164 °C-14%M and for sensorial hardness at 164 °C-19%M. While for specific volume, the highest value (10.41 cm³/g) was obtained at 200 °C-14%M. Water solubility and water absorption were directly related with T and inversely with M. Microscopic observation of the samples indicates that the greatest cooking degree was obtained at 200 °C-4%M and the lowest at 164 °C-19%M. Extrusion at 182 °C-14%M allows obtaining an expanded product with good properties. Proximal composition did not show statistically significant differences with raw sample. Extruded sample showed a 25.4% reduction of available lysine and a 31% increase in protein digestibility.

Publication types

  • Comparative Study
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Argentina
  • Chemical Phenomena
  • Cooking
  • Dietary Fiber / analysis*
  • Dietary Fiber / metabolism
  • Dietary Proteins / analysis
  • Dietary Proteins / chemistry
  • Dietary Proteins / metabolism
  • Digestion
  • Flour / analysis*
  • Food Handling*
  • Hardness
  • Hot Temperature / adverse effects
  • Humans
  • Iron, Dietary / analysis
  • Iron, Dietary / metabolism
  • Lysine / analysis
  • Lysine / metabolism
  • Nutritive Value
  • Plant Proteins / analysis
  • Plant Proteins / chemistry
  • Plant Proteins / metabolism
  • Seeds / chemistry*
  • Seeds / ultrastructure
  • Sensation
  • Solubility
  • Sorghum / chemistry*
  • Sorghum / ultrastructure
  • Starch / analysis
  • Starch / chemistry
  • Starch / metabolism
  • Starch / ultrastructure
  • Water / analysis
  • Zinc / analysis
  • Zinc / metabolism

Substances

  • Dietary Fiber
  • Dietary Proteins
  • Iron, Dietary
  • Plant Proteins
  • Water
  • Starch
  • Zinc
  • Lysine