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Effect of Twin-Screw Extrusion Parameters on the Sensory Quality of Extruded Cereals

WANG Li-juan,YANG Xue-fei,HUANG Yi,JIANG Shao-tong,ZHENG Zhi   

  1. 1. School of Biotechnology and Food Engineering, Hefei University of Technology, Hefei 230009, China;
    2. Key Laboratory for Agriculture Products Processing of Anhui Province, Hefei 230009, China
  • Online:2013-06-25 Published:2013-06-17

Abstract:

Extruded cereals were produced from millet, glutinous rice, soybean, wheat, oat, brown rice and wheat bran flours
using a DS32-I twin-screw extrusion machine. The sensory quality of extruded cereals was investigated with respect to three
operating parameters including moisture content, barrel temperature distribution, screw rotation speed and feeding rotation
speed. These variables were ranked in descending order of importance: moisture content, barrel temperature distribution,
feeding rotation and speed screw rotation speed. Under the conditions of 16%, 150 r/min, 80 ℃ then 145 ℃ and finally 165 ℃
and 20 r/min for moisture content, screw rotation speed, barrel temperature distribution and feeding rotation speed, respectively,
The extruded cereals had improved sensory quality, a faint aroma of cereals, a light yellow color and a delicate taste. In addition,
they easily formed a paste in water without agglomeration or settlement but with good dispersity.

Key words: extrusion, extruded nutritional engineered cereals, process optimization, sensory quality