Quantitative thin layer chromatography for the determination of medroxyprogesterone acetate using a smartphone and open-source image analysis

Intramuscular medroxyprogesterone acetate (MPA) products are commonly used to treat endometriosis and are the most widely used injectable contraceptives worldwide. Therefore, dependable quality screen -ing of MPA injectables is a crucial measure necessary for ensuring that consumers are provided with safe and effective medications. Here, a thin-layer chromatography (TLC) method for MPA identification is combined with image analysis using a smartphone, 3D-printed light box, and open-source ImageJ soft-ware. The method's validation included two brands of MPA injectables, both at 150 mg mL(-1) dosage. The TLC procedure used was based on the identity test found in The International Pharmacopoeia's Medrox-yprogesterone injection monograph. Spots produced on the TLC plates were then photographed using a smartphone camera and quantified using ImageJ's image analysis software. The pixel data collected from each plate's standard spots were compared to the data generated from its sample spots. Data sets col-lected across multiple TLC plates and numerous days of method performance were evaluated to assess linearity, accuracy, precision, specificity, and robustness. Across the range of 75-125% of the target con-centration, the method was found to have linearity of standard spots (with R-2 generally greater than 0.99), overall accuracy of 101.0% (4.1% RSD), repeatability pooled standard deviation of 2.44%, intermedi-ate precision pooled standard deviation of 3.68%, and observed demonstration of specificity and robust-ness. In low and middle-income countries (LMICs), quality screening of pharmaceutical products like MPA injectables can be challenging when testing resources are expensive, difficult to procure, or complex to utilize. The results of the TLC/ImageJ method validation suggest that this simple procedure that requires minimal resources may serve as a viable option for reliable quality screening of MPA levels in injectable suspensions. (c) 2022 The Author(s). Published by Elsevier B.V.