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Quantification of chemicals in Z. officinale using HPLC. HPLC chromatograms of a water extract of Z. officinale (a) and of [6]-gingerol (b) and [6]-shogaol (c) as standards. Two peaks in (a) represent [6]-gingerol (5.982 min) and [6]-shogaol (8.412 min), sequentially. The standard ultraviolet detection wavelength was set at 230 nm. The X-axis reports the retention time (RT), and the Y-axis the absorbance unit (AU).
