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Quality and Functional Properties of Red Ginseng Prepared with Different Steaming Time and Drying Methods  

Kim, Kyo-Youn (Department of Food Science & Technology, Kyungpook National University)
Shin, Jin-Ki (Department of Food Science & Technology, Kyungpook National University)
Lee, Su-Won (Department of Food Science & Technology, Kyungpook National University)
Yoon, Sung-Ran (Department of Food Science & Technology, Kyungpook National University)
Chung, Hun-Sik (Food and Bio-industry Institute, Kyungpook National University)
Jeong, Yong-Jin (Department of Food Science & Technology, Keimyung University)
Choi, Myung-Sook (Department of Food Science & Nutrition, Kyungpook National University)
Lee, Chi-Moo (Punggi Ginseng Nonghyup)
Moon, Kwang-Deog (Department of Food Science & Technology, Kyungpook National University)
Kwon, Joong-Ho (Department of Food Science & Technology, Kyungpook National University)
Publication Information
Korean Journal of Food Science and Technology / v.39, no.5, 2007 , pp. 494-499 More about this Journal
Abstract
The quality and functional properties of red ginseng in relation to steaming and drying conditions were evaluated. Fresh ginseng (5-year roots), cultivated in the Punggi region, were steamed for 2.5, 3.5, or 4.5 hr, and then dried by hot-air (60-$65^{\circ}C$/24 hr and $40^{\circ}C$,/3-4d) freezing ($-80^{\circ}C$/56 hr), and infrared (900 W/$62^{\circ}C$/68 hr). Hunter#s yellowness (b-value) and browning indexes (420 nm) of the samples were higher in the rootlets than in the main roots. Furthermore, these same index values were found to be high in the order of 3.5, 4.5, and 2.5 hr and infrared, hot-air, and freezing for steaming and subsequent drying, respectively. Analysis of soluble solids, total phenolics, total flavonoids, acidic polysaccharides, and electron donating abilities of the steamed and dried samples showed that 3.5hr of steaming with infrared drying was optimal. However, crude saponin contents were not influenced by steaming and drying conditions. The contents of $ginsenoside-Rg_l$, -Re, -Rf and $-Rb_2$, which were the major components in the samples, were reduced with steaming time, while the amounts of $-Rg_3$ and $-Rh_2$ increased, reaching the highest levels at 3.5 and 4.5 hr in the main roots and rootlets, respectively. The contents of $-Rg_3$ and $-Rh_2$ were similar in both the freeze-dried and hot-air dried samples.
Keywords
red ginseng; steaming; drying; functional properties; ginsenoside;
Citations & Related Records
Times Cited By KSCI : 5  (Citation Analysis)
Times Cited By SCOPUS : 8
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