Forcalquier – Jeudi 26 novembre 2009

Distilleries et Domaines de Provence

ZA Les chalus ( Bureaux – Fabrication) 04300 Forcalquier

Programme de la journée: Journée Forcalquier 2009

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Christelle AUNAC, UESS, Forcalquier.

Edmond BOURNY, Laboratoire Provençal des Plantes Aromatiques et Médicinales, Buis les Baronnies.
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Jean-Louis LAFEUILLE, McCormick EMEA central Analysis Laboratory, Carpentras

Abstract : Tests on 106 dried pure cinnamon samples of diverse origins showed that some samples were naturally contaminated with high levels of styrene, up to 524 μg/g. Styrene taint can be associated with high water activity levels and thus with microorganism growth. The mold flora of a Korintji cinnamon sample in which styrene had been found at a 50 μg/g concentration was analyzed and 5 species of mold were isolated. An investigation into the ability of the 5 species of mold to produce styrene showed that 3 of them—namely, Penicillium citrinum, Penicillium oxalicum, Aspergillus niger—produced styrene in vitro in buffered peptone water at 25 ◦C within 5 d in the presence of several natural cinnamon volatile constituents containing the styrene structure. The conversion of these compounds into styrene by these 3 cinnamon fungal species has never been previously reported. A standardized inoculation with the 3 mold species was carried out on 10 g cinnamon samples of various origins followed by a 10-d incubation and highlighting styrene production except for Sri Lanka origin.
Keywords : cinnamon, fungi, gas chromatography-mass spectrometry (GC-MS), spices, styrene

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