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Effects of Die Temperature and CO2 Injection on Physical Properties and Antioxidant Activity of Extruded Rice with Tomato Flour

사출구 온도와 CO2 주입이 쌀·토마토 압출성형물의 물리적 특성 및 항산화 활성에 미치는 영향

  • An, Sang-Hee (Department of Food Science and Technology, Kongju National University) ;
  • Ryu, Gi-Hyung (Department of Food Science and Technology, Kongju National University)
  • Received : 2015.02.17
  • Accepted : 2015.04.07
  • Published : 2015.06.30

Abstract

The study was designed to investigate the effects of die temperature and $CO_2$ injection on the physical and antioxidant properties of extruded rice with tomato flour. Moisture content and screw speed were fixed at 25% and 150 rpm, respectively. Die temperatures and $CO_2$ injection were adjusted to 80, 110, and $140^{\circ}C$ and 0, and 300 mL/min, respectively. Specific mechanical energy input decreased as die temperature increased from 80 to $140^{\circ}C$. The expansion index increased, while bulk density decreased with $CO_2$ injection. All extrudates showed increased water soluble index (WSI) and water absorption index through the extrusion process. WSI increased as die temperature increased. 1,1-Diphenyl-2-picrylhydrazyl (DPPH) radical-scavenging activity and total phenolic compounds increased as die temperature increased from 80 to $140^{\circ}C$. Total carotenoid and lycopene contents decreased through the extrusion process. Total carotenoid and lycopene contents upon 0 mL/min $CO_2$ injection and $140^{\circ}C$ die temperature were highest at $6.65{\mu}g/g$ and 2.69 mg/kg, respectively. In conclusion, $CO_2$ injection affects expansion properties while an increased die temperature leads to increased DPPH radical scavenging activity and total phenols.

Acknowledgement

Supported by : 한국연구재단

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