Simultaneous Determination of Gallic Acid, Ellagic Acid, and Eugenol in Syzygium aromaticum and Verification of Chemical Antagonistic Effect by the Combination with Curcuma aromatica Using Regression Analysis
Table 2
Intraday and interday precision of three reference compounds in Syzygium aromaticum extract ().
Compound
Spiked concentration (g/mL)
Intraday
Interday
Detected concentration (g/mL)
RSDa (%)
Detected concentration (g/mL)
RSD (%)
Gallic acid
5
5.03
2.57
5.30
1.77
10
9.64
1.80
9.59
2.02
20
20.17
0.42
20.13
0.58
Ellagic acid
5
5.34
0.78
5.45
2.80
10
9.67
2.14
9.88
2.26
15
15.11
0.95
14.93
1.27
Eugenol
10
10.52
0.83
10.39
0.36
25
25.09
0.28
25.16
0.14
40
39.81
0.12
39.81
0.08
Relative standard deviation (%) = (standard deviation/mean) 100.
