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In this study, the electrochemical behavior of sulpiride (SUL) was examined deeply by using pyrolytic graphite electrode modified with graphene oxide (GO) and β-cyclodextrin (β-CD). The developed nanosensor indicated considerable impact by significantly increasing the signal of SUL compared with the bare electrode. Cyclic voltammetry (CV), differential pulse voltammetry (DPV), and square wave voltammetry (SWV) methods were utilized to investigate the SUL electrochemical analysis in aqueous solutions. Under optimum experimental conditions, calibration plot for SUL with a limit of detection of 2.83 × 10−9 M was obtained at accumulation time of the 30 s using square wave adsorptive stripping voltammetric technique (AdSSWV) in the range of 1.0 × 10−7 to 5.0 × 10−5 M. The effects of accumulation potential, accumulation time, pH, scan rate, electrolyte, and interfering agents were studied to obtain the intensive peak signal of the analyte. The presented method is validated and successfully performed for the determination of the SUL tablet and capsule. The fabricated nanosensor was carried out for the detection of SUL in the urine. Excellent recoveries among 104.37, 103.82, and 101.95% were obtained for tablet and capsule forms and urine analysis.

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In this work, ratio spectra of the first derivative spectrophotometric and liquid chromatographic methods have been described for the first time for the simultaneous determination of perindopril (PER), indapamide (IND), and amlodipine (AML) in dosage forms. For chromatographic separations several mobile phase compositions were tested for efficient separation with the use of a new column technology related to superficially porous particles. Optimum chromatographic separation was achieved using a Kinetex C18 column (150 × 4.6 mm I.D. 5 µ m) at a flow rate of 1.5 mL min −1. The separation was carried out at 30 • C and the diode array detector was adjusted to 215 nm. As a comparison, a spectrophotometric method depending on the first derivative of the ratio spectra was developed. The first derivative of the ratio amplitudes at 227.2 nm for PER, 269.4 nm for AML, 292.0 nm for IND were selected. The proposed methods were successfully applied for the simultaneous assay of the drug combination in pharmaceutical dosage forms and the methods were compared to each other in terms of Student t and F tests for the comparison of their accuracy and precision parameters.

Electrochemical methods have been used for the determination of nonsteroidal antiinflammatory drugs (NSAID) just as used in the determination of various drugs. Among voltammetric methods; differential pulse voltammetric method, square wave voltammetric method and linear sweep voltammetric method are the most commonly used ones. NSAIDs are widely used in the treatment of inflammatory conditions such as musculoskeletal disorders (rheumatoid arthritis, osteoarthritis, acute gouty arthritis) and dental pain, menstrual pain, postoperative pain and migraine. In this review, some selected recent electrochemical studies were selected related to the nonsteroidal antiinflammatory drug analyzes. The aim of this review is to evaluate and discuss the advantages, details and usages of electroanalytical methods in the determination of nonsteroidal anti-inflammatory drug.