Table 6.

Robustness result of the proposed method by changing volume of components mobile phase

Mobile phase	Methanol			Ethyl acetate			Ammonia
mls	2.9	3	0.1	6.9	7	7.1	0.09	0.1	0.11
% Recovery	98.34	100.10	98.18	100.62	100.10	99.25	97.85	98.18	98.86
%mean recovery	98.22			99.99			98.29
± SD	0.56			0.56			0.42
% RSD	0.57			0.56			0.43