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http://dx.doi.org/10.3746/jkfn.2008.37.9.1174

Changes of Physicochemical Components and Antioxidant Activity of Aged Garlic at Different Temperatures  

Shin, Jung-Hye (Dept. of Hotel Culinary Arts & Bakery, Namhae College)
Choi, Duck-Joo (Dept. of Hotel Culinary Arts, Jaineung College)
Chung, Mi-Ja (The Nutraceutical Bio Brain Korea 21 Project Group, Kangwon National University)
Kang, Min-Jung (Dept. of Food Science and Nutrition, Institute of Agriculture and Life Scineces, Gyeongsang National University)
Sung, Nak-Ju (Dept. of Food Science and Nutrition, Institute of Agriculture and Life Scineces, Gyeongsang National University)
Publication Information
Journal of the Korean Society of Food Science and Nutrition / v.37, no.9, 2008 , pp. 1174-1181 More about this Journal
Abstract
Garlics were aged at 60, 70, 80, and $90^{\circ}C$ for 1, 3 and 6 days. Samples were analyzed for physico-chemical components and antioxidant activities, such as DPPH scavenging activity and reducing power of hot water and ethanol extracts. The Hunter L, a and b values were significantly lower in sample aged at higher temperature and for longer time. In initiation of aging, the share force was the lowest in sample aged at $90^{\circ}C(85.70{\pm}1.44\;kg/cm^2)$ and it increased for 6 days to $411.30{\pm}13.90\;kg/cm^2$ in aging. The pH of garlic was acidified at increasing aged temperature and periods. In sample aged for 6 days at $60^{\circ}C$ and $90^{\circ}C$, pH was 6.12 and 3.90, respectively. Contents of total phenolics and flavonoids also increased in sample aged at higher temperature and for longer time. Their contents increased about 3.5 and 9.1 times higher in sample aged for 6 days at $90^{\circ}C$ than sample aged for 6 days at $60^{\circ}C$, respectively. Total pyruvate contents were fluctuated by aging temperature and periods. DPPH scavenging activity was increased in sample aged at higher temperature and longer time. The highest activity of DPPH scavenging showed $87.48{\pm}0.20%$ in sample aged for 6 days at $90^{\circ}C$. Similar results were observed in reducing power activity. It was estimated that such increases in anti-oxidant activities in aged garlics may come from actions of phenolics, flavonoids and browning compounds in them.
Keywords
garlic; browning compounds; antioxidant activity;
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