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A method based on headspace solid-phase microextraction and cryogenic gas chromatography with flame ionization detection was developed for the determination of volatile residual solvents in traditional Chinese medicines. A laboratory-made cryogenic chromatographic system was used for the separation of 15 kinds of residual solvents. During the analysis, a 65 μm PDMS/DVB fiber was used to extract the residual solvents, the extraction time was controlled at 0°C for 15 min, and the NaCl content of the sample was maintained at 30%. The limits of detection ranged from 0.08 (for octane) to 5000 μg/L (for ethanol), and the relative standard deviations were &amp;lt;8%. The recoveries from spiked samples ranged from 88 to 112%. Trace levels of residual solvents in several traditional Chinese medicines were effectively identified and quantified.

journal of aoac international

Determination of Volatile Residual Solvents in Traditional Chinese Medicines by Headspace Solid-Phase Microextraction and Cryogenic Gas Chromatography with Flame Ionization Detection