A method is described for Sep-Pak silica cartridge purification of patulin from apple juice followed by reversed-phase high-performance liquid chromatographic (HPLC) determination. The method has a rapid sample preparation and offers a good separation of patulin from other constituents. The 80-87 % recovery at 3-100 ppb levels is on the order of the best described methods for patulin analysis. The method has been applied to 10 different apple juice concentrates and 8 commercial apple juices, showing a fairly good reproducibility and a detection level of 2 ppb.* Author to whom correspondence should be addressed. f This research was supported partly by the Catalan Government (CIRIT) and the Spanish Government (CAICYT, Grant PA86-0291).

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