In the study following materials were used: pharmaceutical secondary standards (Certified Reference Material) of acetylsalicylic acid, salicylic acid and glycine (Fluka). Talc (Imifabi) and potato starch (Peepes) were used as excipients for dosage 100 mg ASA and 40 mg GLY, whereas microcrystalline cellulose (JRS Pharma) and maize starch (Roquette) were used as excipients for dosage 150 mg ASA and 40 mg GLY as well as 75 mg ASA and 40 mg GLY. Acetonitrile—gradient grade (Sigma-Aldrich) and orthophosphoric acid (Chempur). Deionized water was obtained by means of ELGA Purelab UHQ PS (High Wycombe, Bucks, UK). Syringe nylon filters (0.45 µm) (Agilent Technologies) were used.
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