Quantitative Analysis of Six Phenolic Acids in Artemisia capillaris (Yinchen) by HPLC-DAD and Their Transformation Pathways in Decoction Preparation Process
Table 2
Calibration curves, LOD, and LOQ data (μg/mL) of six phenolic acids.
No.
Analytes
Calibration curvesa
R2
Linear range
LOD
LOQ
1
5-Caffeoylquinic acid
Y = 0.1718X + 0.0524
1.0000
7.640∼458.4
0.66
2.21
2
3-Caffeoylquinic acid
Y = 0.1749X + 0.1528
0.9999
8.520∼681.2
0.88
2.95
3
4-Caffeoylquinic acid
Y = 0.1518X + 0.0197
0.9999
8.800∼528.0
0.98
3.27
4
1,3-Dicaffeoylquinic acid
Y = 0.1903X + 0.0243
1.0000
4.400∼264.0
0.73
2.42
5
3,4-Dicaffeoylquinic acid
Y = 0.1282X + 0.0132
0.9999
5.640∼338.4
1.38
4.59
6
4,5-Dicaffeoylquinic acid
Y = 0.1197X − 0.0317
0.9999
6.480∼388.8
2.52
8.40
aY = AX + B, where Y is peak area and X is concentration of the constituents (μg/mL).
