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Effect of Red Ginseng Extract on Storage and Antioxidant Activity of Tofu

홍삼 추출물이 두부의 저장성과 항산화 활성에 미치는 영향

  • Lee, Jung-Suk (Geumsan Agricultural Development and Technology Center) ;
  • Kim, Gyo-Nam (Dept. of Food Science and Nutrition, Hannam University) ;
  • Jang, Hae-Dong (Dept. of Food Science and Nutrition, Hannam University)
  • Published : 2008.11.28

Abstract

In relation to making tofu with red ginseng extract, the effects of added red ginseng extract on the storage and antioxidant activity of tofu were investigated. When red ginseng extract was added in $0.5%{\sim}2%$ of dried soybean, differences in texture, color and sensory properties were compared. The textural properties of tofu slightly increased depending on the added amount of red ginseng extract in terms of the hardness and springiness: significant difference was demonstrated in the tofu with 2% red ginseng extract, and the color properties also significantly increased in terms of the values of L, a, and b. As a result of sensory evaluation, although the preference to color tended to diminish, as the peculiar taste of red ginseng was significantly perceived, the overall preference did not show any statistical difference. Therefore, the addition of red ginseng extract may be interpreted as not having negative effect on the preference of consumers. There was no change at the early stage of storage in pH, turbidity and total microbial count when the tofu was stored at $15^{\circ}C$. However, the changes in pH and in turbidity, and total microbial counts according to the addition of red ginseng extract took place from the second day and from the sixth day of storage, respectively, suggesting that the shelf-life of tofu may be extended due to its antimicrobial effect. Especially, the highest antimicrobial effect was observed tofu with 2% red ginseng extract. Concerning the antioxidant activity of tofu using oxygen radical absorbance capacity (ORAC) assay, the antioxidant activity significantly increased along with the increase in concentration of red ginseng extract. In ORACOH.assay, the pro-oxidant activity was shown in the tofu added with red ginseng extract.

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