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. 2012 Nov 13;17(11):13457–13472. doi: 10.3390/molecules171113457

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© 2012 by the authors; licensee MDPI, Basel, Switzerland.

This article is an open-access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/3.0/).

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A typical HPLC profile of protocatechuic acid in the ethyl acetate extract of Rhizoma Atractylodes macrocephala. Syltech P510 system (Los Angeles, CA, USA), Dikma Diamonsil C₁₈ (250 mm × 4.6 mm, 5 μm) column, 1.0 mL/min flow rate, methanol/acetonitrile/5% acetate acid (12:3:10), 10 μL injection, 60 nm wavelength.