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Feces are a possible medium to be used for horse doping control. Efficient methods for detecting drugs in feces collected from various animals are routinely applied in institutes of food safety in Belgium. We have already tested whether they are applicable to horse feces. In this report, accelerated solvent extraction (ASE), an efficient method for extracting compounds from solid material, has been tested. ASE has been used to replace the diethyl ether liquid-liquid extraction step present in the method initially set up. This technique has been optimized for detecting several non-steroidal anti-inflammatory drugs (NSAIDs) in horse feces. Extraction recovery and limit of detection have been determined for several NSAIDs, such as meclofenamic acid, flunixin, vedaprofen, celecoxib, carprofen, diclofenac, and ketoprofen. The method has been successfully applied to meclofenamic acid, flunixin, and phenylbutazone post-administration feces samples, and the main metabolites identified in urine were also detected in feces. In the case of meclofenamic acid, the detection profile in feces presented in this report is in accordance with our previous finding in feces obtained with the original method. The use of ASE decreases the time necessary for sample preparation. This method is applicable on a large scale, which is useful for horse doping control.

Use of Accelerating Solvent Extraction for Detecting Non-Steroidal Anti-Inflammatory Drugs in Horse Feces