Prediction of Total Phenolic Content in Extracts of Prunella Species from HPLC Profiles by Multivariate Calibration

Figure 4

HPLC chromatogram of acidic water extract of Prunella grandiflora; (1) caffeic acid, (2) rutin, (3) rosmarinic acid at, (4) quercetin, and (5) kaempferol.