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Lettuce wrapped in unperforated PE film, perforated PE film, stretch film and without wrapping was stored at 1,6, 20 and 28°C. Freshly harvested lettuce and after one day of storage, independently on storage conditions, did not contains nitrites. During storage of lettuce at 1°C only one time small quantities of nitrites (4.3 mg N02/kg fresh matter) were found - after twelve days storage in perforated...
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