Simultaneous Determination of 8 Compounds in Gancao-Ganjiang-Tang by HPLC-DAD and Analysis of the Relations between Compatibility, Dosage, and Contents of Medicines
Table 5
Precision, repeatability, stability, and recovery of eight substances.
Compound
Precision RSD (%) ()
Repeatability RSD (%) ()
Stability RSD (%) ()
Recoveries (%)
()
RSD (%)
Liquiritin
0.88
1.36
0.51
99.89
1.58
Isoliquiritin
1.02
1.19
0.79
101.67
1.28
Liquiritigenin
1.73
0.97
1.32
98.93
1.33
Glycyrrhizic acid
0.99
1.82
0.33
100.87
0.97
Isoliquiritigenin
1.67
1.01
0.95
101.26
2.87
6-Gingerol
1.58
1.96
2.11
99.94
1.45
8-Gingerol
1.29
1.49
1.46
100.74
1.76
6-Shogaol
1.42
2.01
0.72
98.75
2.83
Recovery (%) = 100 (amount found − original amount)/amount spiked.
