Microextraction (IMAGE) Purdue University Caption A new technique called slug flow microextraction makes it possible to quickly detect the presence of drugs or to monitor certain medical conditions using only a single drop of blood or urine. The technique involves drawing a specimen into a glass capillary that also contains an organic solvent and rocking the capillary back and forth several times to extract target molecules from the biological sample into the solvent. Credit (Purdue University image/Weldon School of Biomedical Engineering) Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.