Simultaneous determination of 4 phenolic acids in Cangerzi by Ultra-performance liquid chromatography

In this study, an analytical method was developed and used to quantify simultaneously protocatechuic acid, neochlorogenic acid, cryptochlorogenic acid and 1, 3-dicaffeoylquinic acid — four bioactive compounds contained in Fructus Xanthii using UPLC.  The contents of four phenolic components of 28 batches of samples collected from different product areas and markets were determined and compared by means of this established method.  The mobile phase was composed of methanol and water containing 0.1% phosphoric acid.  Chromatography was monitored at dual-wavelengths — 220 and 327 nm.  Flow rate was 0.4 mL·min⁻¹ and column temperature was 35 ℃.  The correlation coefficient between concentration and chromatographic peak area of protocatechuic acid, neochlorogenic acid, cryptochlorogenic acid and 1, 3-dicaffeoylquinic acid was  over 0.999 9 in the range of 0.357 0−35.70, 2.500−250.0, 1.060−106.1, 1.010−101.0 µg·mL⁻¹, respectively.  The average recoveries of the four compounds were 97.68%, 99.55%, 97.92% and 100.4%, respectively.  In conclusion, the established method can rapidly attain an accurate and reproducible result used to control the quality of Fructus Xanthii.