Abstract
A straightforward and efficient method was developed for the determination of intact daminozide in apples and apple leaves. After extraction with methanol and a clean-up step using a graphitized carbon cartridge, the extract was analysed by ion-trap liquid chromatography–tandem mass spectrometry (LC–MS–MS) using atmospheric pressure chemical ionisation in the positive ion mode. Recoveries for apple were 98–102% with a R.S.D.≤11% ( n=6) and for leaves were 112–116% with a R.S.D.≤18% ( n=6). The limits of detection were 0.008 and 0.02 mg/kg for apples and leaves, respectively.
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