The Korean Journal of Food And Nutrition (한국식품영양학회지)

The Korean Society of Food and Nutrition (한국식품영양학회)
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Antioxidant Activities and Quality Characteristics of Fermented Codonopsis lanceolata Tea according to Heating Processes

발효한 더덕 차의 열처리에 의한 항산화 활성 및 품질특성

  • Received : 2013.10.17
  • Accepted : 2013.11.11
  • Published : 2013.12.31
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Abstract

This study examines the antioxidant activities and quality characteristics of fermented Codonopsis lanceolata tea according to the heating temperature and time. The browning, turbidity, reducing sugar, total polyphenol and total flavonoid contents all increased with increasing of heating temperature and time, but the pH decreased within the range of error. In particular, the total polyphenol contents of the heat treatment sample for 15 minutes at $200^{\circ}C$ are increased to about 4.5 times of 713.71mg/100ml as compared to the control group. From the results of the antioxidant activity test, as both the heating temperature and time increases, the antioxidant activity was increased for DPPH radical-scavenging activity, FRAP and reducing its power. In the case of the samples treated with heat for 15 minutes at $200^{\circ}C$ in the DPPH radical scavenging ability, it increased about twice more than the 45.17% control plot at 85.40%, and the reducing power and FRAP were increased to approximately two or three times more than the control group. According to the results for sensory test of fermented C. lanceolata tea according to heating temperature and time, the preference was confirmed as high by heat treatment due to increased temperature and time. Heat treatment process of C. lanceolata during the process is determined by the conditions required for high value-added products through the improvements of the taste and functionality of C. lanceolata.

본 연구는 독특한 식감과 풍미로 인하여 가공성이 낮은 C. lanceolata의 응용성을 높이기 위해 발효차를 제조하고, 열처리가 미치는 영향에 대하여 이화학 특성 및 항산화력 분석을 통하여 확인하였다. 열처리 온도 및 시간이 증가함에 따라 pH는 감소하는 경향을 보였으나, 갈색도, 탁도, 환원당, 총 폴리페놀 및 총 플라보노이드 함량은 유의한 수준으로 증가하는 경향을 보였다. 특히 200$^{\circ}C$ 15분 열처리한 시료의 총 폴리페놀 함량은 713.71mg/100ml로 대조구에 비해 약 4.5배 증가하였다. 항산화력 측정 결과, DPPH radical 소거능, FRAP 및 환원력에서 열처리 온도 및 시간이 증가함에 따라 항산화력이 뚜렷하게 증가되는 경향을 나타냈다. DPPH radical 소거능에서 $200^{\circ}C$ 15분 열처리한 시료의 경우, 85.40%로 대조구 45.17%에 비해 약 2배 이상 증가되었으며, FRAP 및 환원력 또한 $200^{\circ}C$ 15분 열처리한 경우, 대조구에 비해 약 2~3배 이상 증가하였다. 열처리에 따른 관능검사 결과, 열처리 온도 및 시간이 증가함에 따라 선호도 역시 높게 나타났다.

Keywords

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