Table 2. Linearity and sensitivity data of natural food preservatives

Compounds	Linearity range (μg/mL)	Regression equation1)			LOD (μg/mL)	LOQ (μg/mL)
		Slope	Intercept	r2)
Benzoic acid	0.20-8.00	8.63×104	−2.34×103	1.00	0.08	0.23
Sorbic acid	0.25-10.00	5.35×104	−2.63×103	1.00	0.38	1.14
Propionic acid	1.00-80.00	1.05×10−2	−1.09×10−2	0.999	0.71	2.14
Nitrate	0.30-20.00	1.33×105	3.89×103	0.999	0.52	1.58