Quantitative Analysis of Six Phenolic Acids in Artemisia capillaris (Yinchen) by HPLC-DAD and Their Transformation Pathways in Decoction Preparation Process

Figure 4

Possible transformation pathways of mono-caffeoylquinic acid (5-caffeoylquinic acid, 3-caffeoylquinic acid, and 4-caffeoylquinic acid) and bis-caffeoylquinic acid (1,3-dicaffeoylquinic acid, 3,4-dicaffeoylquinic acid, and 4,5-dicaffeoylquinic acid).