Smart green spectrophotometric assay of the ternary mixture of drotaverine, caffeine and paracetamol in their pharmaceutical dosage form

Table 1 Analytical performance data for the determination of DRT, CAFF and PAR by the derivative method

Parameter	DRT	CAFF	PAR
Wavelength (nm)	320 nm	285 nm	307 nm
Linearity range (µg/mL)	2–20	1.5–15	5–40
Intercept (a) × 10^–3	− 3.7	0.0098	7.8
Slope (b) × 10^–3	9	0.0691	0.8
Correlation coefficient (r)	0.9999	0.9998	0.9999
S.D. of residuals (S_y/x) × 10^–3	0.70	5.80	0.420
S.D. of intercept (S_a) × 10^–3	0.40	3.40	0.33
S.D. of slope (S_b) × 10^–3	0.05	0.05	0.01
% RSD^a	0.94	1.02	0.46
% Error^b	0.35	0.42	0.19
LOD^c (µg/mL)	0.14	0.16	1.37
LOQ^d (µg/mL)	0.43	0.48	4.14

ISSN: 2661-801X