Quantification of Antioxidant Phenolic Compounds in a New Chrysanthemum Cultivar by High-Performance Liquid Chromatography with Diode Array Detection and Electrospray Ionization Mass Spectrometry

Table 3

Linear range, regression equation, correlation coefficients, LODs, and LOQs of the compounds.

Compound	Regression equation	Correlation coefficient (r^2)	LOD (μg/mL)	LOQ (μg/mL)
Acacetin (1)	y = 11.349x + 2.520	0.9996	0.057	0.173
Apigenin (2)	y = 36.953x − 46.980	0.9992	0.575	1.742
Luteolin (3)	y = 23.094x + 5.220	0.9995	0.244	0.738
Acacetin-7-O-β-glucoside (4)	y = 14.277x + 20.120	0.9991	0.206	0.624
Apigenin-7-O-β-glucoside (5)	y = 33.317x − 9.170	0.9992	0.542	1.644
Luteolin-7-O-β-glucoside (6)	y =14.105x − 16.180	0.9993	0.267	0.811
Linarin (7)	y = 21.849x − 21.340	0.9994	0.716	2.168
Chlorogenic acid (8)	y = 18.675x − 17.907	0.9994	0.178	0.539
Mixture of 1,4-, 1,5-, and 3,5-DCQAs (9–11)	y = 22.766x − 25.32	0.9991	0.601	1.822

y = peak area, x = concentration (μg/ml), = slope, = intercept; limit of detection (LOD): 3.3 × (SD of the response/slope of the calibration curve); limit of quantification (LOQ): 10 × (SD of the response/slope of the calibration curve).