Table 1.

Regression equations, correlation coefficients (R²) and linear range for α-pinene, β-elemene, curcumol, germacrone and curdione.

Reference substances	Regression equation	R2	Linear range (μg/mL)
α-pinene	y=0.3387x+0.0036	0.9976	0.0113–0.5631
β-elemene	y=0.0636x−0.0104	0.9996	0.2501–12.5061
Curcumol	y=0.0285x−0.0148	0.9988	0.5155–25.7339
Germacrone	y=0.1138x−0.0932	0.9993	3.3326–166.6294
Curdione	y=0.1161x−0.073	0.9993	1.9348–96.7398