Table 3.

Linearity for target metabolites produced by calibration curves

Analyte	Linear range (ng/mL)	Regression equation	r2
Salicylic acid 2-O-β-D-glucoside	0.8–40	y = 0.01237x + 0.00013	0.9989
2,3-Dihydroxybenzoic acid	0.8–40	y = 0.04061x + 0.00078	0.9992
Salicylic acid	0.8–40	y = 0.09231x - 0.00041	0.9995
Jasmonic acid	0.8–40	y = 0.00238x - 0.00010	0.9985
Methyl salicylate	8–400	y = 0.00157x - 0.00014	0.9987