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Use of Carvacrol and Cymene To Control Growth and Viability of Listeria monocytogenes Cells and Predictions of Survivors Using Frequency Distribution Functions

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Abstract:

The antibacterial action of carvacrol and cymene on two Listeria monocytogenes strains (STCC4031 and NCTN4032) was studied. Carvacrol or cymene showed inhibitory effect on the growth of L. monocytogenes during lag and exponential growth phases and was more evident with increasing concentrations in brain heart infusion broth at 30°C. Carvacrol or cymene also decreased the survival of mid-exponential-growth-phase L. monocytogenes STCC4031 cells in potassium-N-2-hydroxy-ethylpiperazine-N-ethanesulfonic acid, at 30°C. The combination of carvacrol and cymene resulted in an increased antibacterial effect on the growth and a synergistic effect on the viability of L. monocytogenes compared with the natural compounds applied separately. The analysis of survival curves by the Weibull frequency distribution function allowed an accurate prediction of the level of inactivation achieved. Interestingly, an important bactericidal effect (4.7-log reduction) of low concentrations of both antimicrobials combined (0.75 mM) was observed on L. monocytogenes in carrot juice. This study indicates the potential use of carvacrol and cymene applied simultaneously for preservation of minimally processed foods.

Document Type: Research Article

Affiliations: 1: Universidad Politécnica de Cartagena, Escuela Técnica Superior de Ingeniería Agronómica (ETSIA), Departamento Ingeniería de los Alimentos y delEquipamiento Agrícola, Paseo Alfonso XIII 48, 30203 Cartagena (Murcia), Spain 2: Universidad Politécnica de Cartagena, Escuela Técnica Superior de Ingeniería Agronómica (ETSIA), Departamento Ingeniería de los Alimentos y delEquipamiento Agrícola, Paseo Alfonso XIII 48, 30203 Cartagena (Murcia), Spain 3: Universidad Politécnica de Cartagena, Escuela Técnica Superior de Ingeniería Agronómica (ETSIA), Departamento Ingeniería de los Alimentos y delEquipamiento Agrícola, Paseo Alfonso XIII 48, 30203 Cartagena (Murcia), Spain 4: Universidad Politécnica de Cartagena, Escuela Técnica Superior de Ingeniería Agronómica (ETSIA), Departamento Ingeniería de los Alimentos y delEquipamiento Agrícola, Paseo Alfonso XIII 48, 30203 Cartagena (Murcia), Spain

Publication date: July 1, 2004

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