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

Table 4

Determination of aclidinium in Duaklir Genuair inhalation powder by the proposed ratio derivative, ratio subtraction, and the reported methods.

Parameters	Ratio derivative	Ratio subtraction	Reported method [14]
n^a	5	5	5
Average (% recovery)	99.23	100.22	99.65
SD	1.462	1.599	1.717
% RSD	1.474	1.595	1.724
T (2.306)^b	0.949	0.030	—
F (6.388)^b	1.400	1.171	—

^aNumber of measurements; ^bThe values in parenthesis are tabulated values of “t” and “F” at ().