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http://dx.doi.org/10.4014/kjmb.1408.08002

Antimicrobial Activities of Licorice Extracts from Various Countries of Origin according to Extraction Conditions  

Bae, Jeong Yun (Department of Fine Chemistry, Nanobiocosmetic Laboratory, and Cosmetic R&D Center, Seoul National University of Science and Technology)
Jang, Ha Na (Department of Fine Chemistry, Nanobiocosmetic Laboratory, and Cosmetic R&D Center, Seoul National University of Science and Technology)
Ha, Ji Hoon (Department of Fine Chemistry, Nanobiocosmetic Laboratory, and Cosmetic R&D Center, Seoul National University of Science and Technology)
Park, Jong-Ho (Daebong LS, Ltd.)
Park, Jino (Daebong LS, Ltd.)
Park, Soo Nam (Department of Fine Chemistry, Nanobiocosmetic Laboratory, and Cosmetic R&D Center, Seoul National University of Science and Technology)
Publication Information
Microbiology and Biotechnology Letters / v.42, no.4, 2014 , pp. 361-366 More about this Journal
Abstract
In this study, Glycyrrhiza uralensis and Glycyrrhiza glabra extracts, with their countries of origin as Korea (Jecheon), Uzbekistan and China, were prepared under various extraction conditions. There were 8 extraction conditions which the licorice were subjected to, and all conditions had different extraction solvents, temperatures and times. Antimicrobial activity on skin flora was evaluated comparatively by a disc diffusion assay, broth macrodilution assay, and kill time curve assay. Based on the antimicrobial activity of their extract confirmed by disc diffusion assay, we established optimal extraction conditions. The Korean licorice extract (85% ethanol, $40^{\circ}C$, 12 h) showed the best activity amongst the samples examined. In particular, its antimicrobial activity against Propionibacterium acnes was the highest. Minimum inhibitory concentrations (MIC) and minimum bactericidal concentrations (MBC) of the licorice extracts revealed that the Korean licorice ($156{\mu}g/ml$ and $1,250{\mu}g/ml$) had better antimicrobial activity than that of the Uzbekistani licorice ($625{\mu}g/ml$ and $2,500{\mu}g/ml$) and the Chinese licorice ($625{\mu}g/ml$ and $5,000{\mu}g/ml$). Taken together, it was shown that Korean licorice extracted in group F (85% ethanol, $40^{\circ}C$, 12 h) had the highest antimicrobial activity amongst the licorices from the other countries of origin. These results also suggest that the optimal extraction conditions are 85% ethanol, $40^{\circ}C$, 12 h, and that licorice has a potential application as a natural preservative in cosmetics products, thereby replacing synthetic preservatives.
Keywords
Glycyrrhiza uralensis; Glycyrrhiza glabra; antimicrobial activity; extraction conditions; natural preservative;
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Times Cited By KSCI : 6  (Citation Analysis)
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