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Effect of Processing Methods on the Saponin Contents of Panax ginseng Leaf-Tea  

장현기 (숭의여자대학 식품영양과)
Publication Information
The Korean Journal of Food And Nutrition / v.16, no.1, 2003 , pp. 46-53 More about this Journal
Abstract
Panax ginseng leaf tea was developed for the functional benefit of health, preference and convenience. The leaves of 4-year-old ginseng were selected in July and August. The ginseng leaf was treated by three methods : heat processed tea(HPT), aged tea(AGT) and hot-air dried tea(DRT). The contents and compositions of their crude saponin of ginseng leaves were measured. 1. The content of crude saponin of HPT was the higher than other treatments. The content of HPT was 18.72∼18.82％, ACT 18.24∼18.29％ and DRT 17.02∼17.17％. 2. The harvest time and treatment methods were not affect the composition of ginsenoside in ginseng leaf tea. The ginsenoside-Re was shown the highest value as 1.97∼2.15. And ginsenoside-Rd was 1.48∼1.79, -Rg$_1$ 1.33∼1.58 and -Rb, -Rb$_2$, -Rc in the order. 3. The content of protopanaxadiol(PD) and protopanaxatriol(PT) was shown that DRT was 1.11∼1.13, HPT 1.09～l.12 and AGT 0.92∼1.02. The content of PD and PT were shown similar result at any harvest time. 4. The contents of crude saponin extracted by hot-water at 5 min was the higher ratios in HPT and harvested in July than other treatments. The content of crude saponin of ginseng leaf harvested in July was 15.88% and HPT was 16.88%. The order of contents of ginsenoside were -Re, -Rd, -Rg$_1$, -Rb$_1$, -Rb$_2$, and - Rc. The extraction ratio of crude saponin extracted by the circulated extraction method in 8 hours and 5 min extraction were 81.74∼84.38％. And HPT of ginseng leaf harvested in July was the highest value 84.3％ but the extraction ratio of ginsenoside was 78.00～88.13%. But the extraction ratio of ginsenoside was similar trend in all treatments.
Keywords
ginseng leaf tea; crude saponin; ginsenoside;
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