This study investigated the antioxidant properties of the Radix isatidis extract and the effect of substituting it with sodium nitrite (SN) in a pork patty. The antioxidant activity of the Radix isatidis water extract (RIWE) was compared to those of the methanol and chloroform extracts (RIME and RICE, respectively). Patties were prepared with five different treatments: (1) a control with no RIWE and SN, (2) T1 with 150 ppm SN, (3) T2 with 100 ppm SN + 0.1% RIWE, (4) T3 with 50 ppm SN + 0.3% RIWE, and (5) T4 with 0.5% RIWE. They were used to compare the oxidation stability for 12 days at 4℃. The extraction yield of RIWE was 3.2 and 18.7 times higher (p<0.05) than those of RIME and RICE, respectively, but RIWE had the lowest (p<0.05) 1,1`-diphenyl-2-picrylhydrazyl radical scavenging activity, superoxide dismutase-like activity, and total reducing ability. Patties with RIWE and SN exhibited lower (p<0.05) pH values after 12 days, compared to the control. After 4 days, the 2-thiobarbituric acid reactive substances content was lower (p<0.05) in T1, T2, T3, and T4 than in the control. The oxidation-reduction potential value was the lowest (p<0.05) in T3 and T4 after 4 days (p<0.05). T1, T2, T3, and T4 had a lower (p<0.05) volatile basic nitrogen content after 12 days, compared to the control. These findings suggest that RIWE has an antioxidant effect similar to that of SN, but further research on its antimicrobial effect may be required to determine if it is a good substitute for SN.

ABSTRACT
Ⅰ. 서론
Ⅱ. 재료 및 방법
    1. 판람근 추출물 제조
    2. 추출물 수율
    3. DPPH라디칼 소거력
    4. SOD 유사활성
    5. 총환원력
    6. 돈육패티 제조 및 설계
    7. pH
    8. 지방산화물 함량
    9. 산화환원전위
    10. 휘발성 염기질소 함량
    11. 통계분석
Ⅲ. 결과 및 고찰
    1. 추출수율
    2. DPPH라디칼 소거력
    3. SOD 유사활성
    4. 총환원력
    5. pH
    6. 지방산화물 함량
    7. 산화환원전위
    8. 휘발성 염기질소 함량
Ⅳ. 요약
Ⅴ. 참고문헌

• 박재인(강원대학교 동물응용과학과) | Jae In Pak (Department of Applied Animal Science, College of Animal Life Sciences, Kangwon National University)
• 이선엽(강원대학교 동물응용과학과) | Sun-Youb Lee (Department of Applied Animal Science, College of Animal Life Sciences, Kangwon National University)
• 이성기(강원대학교 동물응용과학과) | Sung Ki Lee (Department of Applied Animal Science, College of Animal Life Sciences, Kangwon National University)
• 강선문(농촌진흥청 국립축산과학원 축산물이용과) | Sun Moon Kang (Animal Products Utilization Division, National Institute of Animal Science, Rural Development Administration) Corresponding author