Table 2.

Sensitivity and regression parameters.

Parameter	Clidinium bromide	Chlordiazepoxide
Optimum concentration range (μg mL−1)	2.5–300.0	3.0–500.0
Regression equation∗	A CDB = 0.4592C CDB + 1.1366	A CDZ = 1.1895C CDZ + 2.2553
Correlation coefficient (n = 5)	0.9999	0.9999
Standard deviation of slope	0.0019	0.0025
Standard deviation of intercept	0.0135	0.0504
Regression equation∗∗	R CDB/ALT = 0.003C CDB + 0.009	R CDZ/ALT = 0.009C CDZ + 0.017
Correlation coefficient (n = 5)	0.9999	0.9999
Standard deviation of slope	1.1 × 10−5	2.8 × 10−5
Standard deviation of intercept	5.9 × 10−4	8.1 × 10−4
Limit of quantification, LOQ (μg mL−1)	0.294	0.403
Limit of detection, LOD (μg mL−1)	0.088	0.121

^* Regression equation for the peak area of drug versus concentration of drug in μg mL⁻¹.

∗∗Regression equation for the ratio of peak area of drug to that of I.S. versus concentration of drug in μg mL⁻¹.