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http://dx.doi.org/10.3839/jabc.2017.009

Phytochemical constituents of Coix lachryma-jobi var. ma-yuen roots and their tyrosinase inhibitory activity  

Choi, Yun-Hyeok (Bio-Center, Gyeonggido Business & Science Accelerator)
Choi, Chun Whan (Bio-Center, Gyeonggido Business & Science Accelerator)
Lee, Jae Yeon (Bio-Center, Gyeonggido Business & Science Accelerator)
Ahn, Eun-Kyung (Bio-Center, Gyeonggido Business & Science Accelerator)
Oh, Joa Sub (College of Pharmacy, Dankook University)
Hong, Seong Su (Bio-Center, Gyeonggido Business & Science Accelerator)
Publication Information
Journal of Applied Biological Chemistry / v.60, no.1, 2017 , pp. 49-54 More about this Journal
Abstract
In the course of screening tyrosinase inhibitory activity, EtOAc-soluble fraction of Coix lachryma-jobi var. mayuen Stapf. (Gramineae) roots showed significant inhibition. Further fractionation of the EtOAc-soluble fraction resulted in six compounds, which were identified as (+)-icariol $A_2$ (1), zhepiresionol (2), 4-hydroxybenzaldehyde (3), trans-${\rho}$-coumaric acid (4), N-(2-hydroxy-4-methoxyphenyl)-2-hydroxyacetamide (5), and coixol (6). The chemical structures of these compounds were identified on the basis of spectroscopic methods (MS, 1D and 2D NMR) and comparison with literature values. Compound 1 was first reported from this plant. Also, this is the first time that the isolation of compound 5 has been reported from nature source. Among the isolated compounds, compounds 4 and 6 showed enzyme inhibitory activity, with $IC_{50}$ values of 6.5 and $62.4{\mu}M$, respectively, in comparison with these of positive control, arbutin.
Keywords
Acetamide; Benzoxazolinone; Coix lachryma-jobi var. ma-yuen; Phenolic compounds; Tyrosinase;
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