Summary of key cross-validation results for the CE and LC methods.

Validation parameter	CE	HPLC
Linear range	10–100 μg mL−1	10–100 μg mL−1
Weighting factor	1/x2	1/x2
Slope	0.00414	0.0253
Intercept	0.0001096	−0.0281
Correlation coefficient	0.9988	0.9988
Detection limita (μg mL−1)	1.67	0.06
Quantitation limitb (μg mL−1)	5.00	0.20

^aCalculated as the concentration of the analyte at which the signal-to-noise ratio is 3 : 1.

^bCalculated as the concentration of the analyte at which the signal-to-noise ratio is 10 : 1.