Table 3.

Recovery and ion suppression data for the quantitation of metformin and rosuvastatin by HILIC-ESI/MS.

Compound	Concentration Levels (ng mL−1)
Metformin	1000	5000
% Recovery (mean ± s.d.)n = 3	92.6 ± 2.5	93.9 ± 1.4
% Matrix Factor (mean ± s.d.)n = 3	59.9 ± 1.0	63.7 ± 1.3
Rosuvastatin	20	100
% Recovery (mean ± s.d.)n = 3	96.6 ± 2.1	95.8 ± 4.1
% Matrix Factor (mean ± s.d.)n = 3	84.5 ± 7.1	81.3 ± 2.0
N-despropyl ropinirole (ISTD)	3800
% Recovery (mean ± s.d.)n = 3	91.7 ± 3.8
% Matrix Factor (mean ± s.d.)n = 3	61.8 ± 1.8