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For sample preparation solid-phase extraction (SPE) became very popular during the 1980s and 1990s. Because method development and its optimization is very time consuming, in most cases C 18 is used as standard carrier material without knowing if it possesses the highest efficiency. Therefore detailed studies with different stationary phases are necessary for optimal recovery rates. Due to the resulting high number of samples, automation is of crucial importance. In the study described, the extraction of five monoterpenoids (myrcene, citronellal, p-cymene, menthol and thymol) out of an ethanolic solution was optimized using automated SPE. An automated robotic system, the MEA Personal Purification System ® from PhyNexus™ Inc.