Abstract
Abstract A comparative study was made of several techniques used in the isolation and identification of microgram quantities of drugs by infrared spectroscopy. The isolation techniques include preparative GLC and TLC. In the case of TLC, silica gel interference was nearly eliminated by using a sintered glass filter and vacuum. The identifications were enhanced by concentrating the sample in the infrared beam center. The sample was centered either with the aid of a cardboard silhouette or punched out or drilled indentations in the disk.
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