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Stability of the dithiocarbamate pesticide maneb in tomato homogenates during cold storage and thermal processing

The effect of storage at 5°C and of thermal processing by cooking at 100°C and sterilization at 121°C for 15 min on maneb residues in tomato homogenates was investigated. Remaining maneb and its toxic metabolite ethylenethiourea (ETU) were measured after each treatment by headspace gas chromatography with flame-photometric detection and by high-performance liquid chromatography with photo-diode array detection, respectively. No significant loss of maneb was observed during cold storage for up to 6 weeks, taking into account analytical variability. Conversely, thermal treatment resulted in substantial degradation of maneb with extensive conversion to ETU. After cooking, only 26 ± 1% (± SE, n = 8) of initial maneb residues remained in the samples, whilst the conversion to ETU was 28 ± 1% (mol mol−1) (± SE, n = 4). Sterilization eliminated the residues of the parent compound giving rise to conversion to ETU up to 32 ± 1% (mol mol−1) (± SE, n = 4).