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http://dx.doi.org/10.4014/kjmb.1407.07010

Bioconversion of Ginsenoside Rb1 to the Pharmaceutical Ginsenoside Compound K using Aspergillus usamii KCTC 6954  

Jo, Mi Na (Department of Food Science and Biotechnology of Animal Resources, Konkuk University)
Jung, Ji En (Department of Food Science and Biotechnology of Animal Resources, Konkuk University)
Yoon, Hyun Joo (Department of Food Science and Biotechnology of Animal Resources, Konkuk University)
Chang, Kyung Hoon (Food R&D, CJ Cheiljedang Corp.)
Jee, Hee Sook (Ilhwa Co., Ltd.)
Kim, Kee-Tae (Bio/Molecular Informatics Center, Konkuk University)
Paik, Hyun-Dong (Department of Food Science and Biotechnology of Animal Resources, Konkuk University)
Publication Information
Microbiology and Biotechnology Letters / v.42, no.4, 2014 , pp. 347-353 More about this Journal
Abstract
${\beta}$-Glucosidase from Aspergillus usamii KCTC 6954 was used to convert ginsenoside Rb1 to compound K, which has a high bio-functional activity. The enzymatic activities during culturing for 15 days were determined using ${\rho}$-nitrophenyl-${\beta}$-glucopyranoside. The growth rate of the strain and the enzymatic activity were maximized after 6 days (IU; $175.93{\mu}M\;ml^{-1}\;min^{-1}$). The activities were maximized at $60^{\circ}C$ in pH 6.0. During culturing, Rb1 was converted to Rd after 9 d and then finally converted to compound K at 15 d. In the enzymatic reaction, Rb1 was converted to the ginsenoside Rd within 1 h of reaction time and compound K could be detected after 8 h. As a result, this study demonstrates that $Rb1{\rightarrow}Rd{\rightarrow}F2{\rightarrow}$compound K is the main metabolic pathway catalyzed by ${\beta}$-glucosidase and that ${\beta}$-glucosidase is a feasible option for the development of specific bioconversion processes to obtain minor ginsenosides such as Rd and compound K.
Keywords
Panax ginseng; ${\beta}$-glucosidase; Aspergillus usamii; ginsenoside; bioconversion;
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