Different Spectrophotometric Methods Manipulating Ratio Spectra Applied for the Analysis of Aclidinium in Duaklir^® Genuair^® Inhalation Powder

Table 2

Determination of aclidinium in mixtures with formoterol by the proposed ratio derivative and ratio subtraction methods.

Aclidinium (μg/mL)	Formoterol (μg/mL)	% recovery
		Ratio derivative	Ratio subtraction
5	5	97.77	98.12
10	5	100.08	99.81
20	10	100.28	101.10
30	10	101.76	101.32
40	5	102.48	98.73
Mean ± % RSD		100.47 ± 1.806	99.82 ± 1.415