Effect of moisture on salmonella spp. heat resistance in cocoa and hazelnut shells |
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Authors: | Walter Peñaloza Izurieta Evangelia Komitopoulou |
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Affiliation: | 1. Nestlé Research Center, Lausanne, Vers-Chez-Les-Blanc, 1000 Lausanne 26, Switzerland;2. Leatherhead Food Research (LFR), Randalls Road, Leatherhead, Surrey KT22 7RY, United Kingdom |
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Abstract: | The heat resistance of food-poisoning outbreak and non-outbreak associated strains of Salmonella (S. Enteritidis, S. Montevideo, S. Napoli, S. Oranienburg, S. Poona, S. Senftenberg and S. Typhimurium) was established in confectionery-related materials such as crushed cocoa bean and hazelnut shells at low moisture contents (≤ 4% w/w). The two most heat resistant strains in cocoa and hazelnut shells at ca. 4% w/w moisture were S. Oranienburg and S. Enteritidis PT30. Both strains were associated with outbreaks from dried materials. Their D100°C values were ca. 2.5 min in crushed cocoa bean shells and 7–11 min in crushed hazelnut shells. Addition of moisture to ca. 7% w/w markedly reduced D-values (D80°C of 2–4.5 min) for both strains in the two matrices. |
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