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3M Empore extraction disk. Commonly used for the solid phase extraction of analytes from complex sample matrices. A variety of functional groups, such as octadecyl (C18) and octyl (C8) can be bonded to the silica surface to provide non polar interactions. Sorbents exhibits unique properties of retention and selectivity for a particular analyte. Sorbentis best for a particular method will be influenced by the percent recovery of analyte from the sample matrix and the cleanliness of the resulting chromatography. These products are intended for use during scientific research only and are not intended for use in medical devices or in assessment and treatment of clinical patients.