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Changes in Quality Characteristics of Cheongkukjang added with Deodeok

더덕이 첨가된 청국장의 품질특성 변화

  • Received : 2010.11.03
  • Accepted : 2011.03.11
  • Published : 2011.04.30

Abstract

In order to demonstrate the usefulness of Deodeok. the functions of Deodeok and the qualities of Cheongkukjang were investigated. DPPH (1.1-diphenyl-2-picryl-hydrazyl) radical scavenging activity of Deodeok extracted with 70% ethanol was higher than that of water extract. The direct antimutagenic effect of ethanol extract of Deodeok was examined by Ames test using Salmonella typimurium TA 98. The inhibition rates on ethanol extract at concentrations of 200, 1.000, 2.000, 3.000 and 4.000 ${\mu}g$/plate were 5.75, 31.38, 34.75, 53.50 and 83.75%, respectively. The inhibition rates of ethanol extract was higher over 2 times than that of water extract. The qualities including physicochemical and sensory properties of Deodeok Cheongkukjang were investigated over the following range of Deodeok levels; 5, 10, 15 and 20% (w/w). The strain used in Cheongkukjang manufacture was Bacillus sp. B-3 with the highest enzyme activities such as amylase and protease. During fermentation at $40^{\circ}C$ for 6 days. amino-type nitrogen content of Cheongkukjang containing 10% (w/w) Deodeok was more than others. When Deodeok content exceeded 15% (w/w), higher contents resulted in lesser amino-type nitrogen production. The results showed that Deodeok had influenced the growth of Bacillus sp. B-3. The L-value of Deodeok Cheongkukjang was decreased according to increasing the Deodeok contents. Sensory evaluation showed that Deodeok Cheongkukjang containing 10% (w/w) Deodeok was superior to other tested.

Keywords

deodeok;cheongkukjang;amino-type nitrogen;antioxidative activity;antimutagenic activity

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