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http://dx.doi.org/10.3746/jkfn.2014.43.9.1415

Quality Properties of Yogurt Added with Hot Water Concentrates from Allium hookeri Root  

Jun, Hyun-Il (Department of Food Science and Technology, Chonbuk National University)
Park, Seon-Yeong (Department of Food Science and Technology, Chonbuk National University)
Jeong, Do-Yeon (Sunchang Research Center for Fermentation Microbes (SRCM))
Song, Geun-Seoup (Department of Food Science and Technology, Chonbuk National University)
Kim, Young-Soo (Department of Food Science and Technology, Chonbuk National University)
Publication Information
Journal of the Korean Society of Food Science and Nutrition / v.43, no.9, 2014 , pp. 1415-1422 More about this Journal
Abstract
Hot water extraction concentrate was prepared from Alliun hookeri root (AHR) to evaluate its applicability to yogurt. The highest antioxidant activity of hot water concentrates was obtained under extraction conditions of 4 hr at $95^{\circ}C$. Antioxidant activities measured by DPPH radical assay, ABTS radical cation assay, reducing power, and cheating activity were highly correlated with total phenolic (89.51 mg/g) and total flavonoid (52.71 mg/g) contents, with R values of 0.94 and 0.96, respectively. Yogurt was fermented with a commercial lactic acid bacteria mixed strain (Yo-mix$^{TM}$ 305) for 10 hr at $42^{\circ}C$ after addition of 0~10% (w/w) hot water concentrates from AHR to yogurt base. As fermentation proceeded, pH and $^{\circ}Brix$ of yogurt decreased from 6.57~6.60 to 4.34~4.51 and from 8.10~8.90% to 4.60~5.25%, respectively, whereas titrate acidity, viscosity, and viable cell numbers increased from 0.22~0.23% to 1.01~1.10%, from $0mPa{\cdot}s$ to $202.55{\sim}290.50mPa{\cdot}s$, and from 6.40~6.80 log CFU/mL to 8.60~9.20 log CFU/mL, respectively. There was no significant difference in any sensory attribute between the control and 2.5% addition group, suggesting that 2.5% hot water concentrate from AHR could be used to manufacture yogurt.
Keywords
Allium hookeri root; yogurt; antioxidant activities; hot water concentrates;
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Times Cited By KSCI : 15  (Citation Analysis)
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