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This study developed a new measurement procedure using isotope dilution-liquid chromatography-tandem mass spectrometry for accurate quantification of DHEAS in human serum or plasma, demonstrating high selectivity, sensitivity, and low measurement uncertainty, making it suitable for routine standardization and clinical evaluation.

This study reported high analytical performance of an RMP for DHT quantification, with the ability to differentiate between 5α-DHT and 5β-DHT isomers, making it suitable for routine assay standardization and clinical sample evaluation.

This study developed a high performance capillary electrophoresis method, validated for both legal and illicit minoxidil-based products, to confirm minoxidil's presence alongside known impurities.

This study found that a photometric flow titration using KMnO4 and minoxidil provided results comparable to a chromatographic procedure, with recoveries between 97.6% and 102.8% and relative errors of 3.5% to 4.0%.

This study proposed a simple, rapid permanganometric method for determining minoxidil concentrations in pharmaceutical samples, offering comparable accuracy to chromatographic methods with recovery rates of 94.5 to 95.2%.