Modeling the Inactivation and Possible Regrowth of Salmonella enterica Treated with Chlorophyllin-Chitosan and Visible Light

Author:

Rodríguez-López María Isabel1ORCID,Gómez-López Vicente M.2ORCID,Lukseviciute Viktorija3ORCID,Luksiene Zivile3ORCID, ,

Affiliation:

1. Departamento de Ciencia y Tecnología de Alimentos, Universidad Católica de Murcia (UCAM), Campus de los Jerónimos 135, 30107 Guadalupe, Murcia, Spain

2. Cátedra Alimentos para la Salud, Universidad Católica de Murcia (UCAM), Campus de los Jerónimos 135, 30107 Guadalupe, Murcia, Spain

3. Institute of Computer Science, Vilnius University, Didlaukio g. 47, 08303 Vilnius, Lithuania

Abstract

The study focuses on predictive modelling of inactivation of Salmonella enterica after treatment with chlorophyllin-chitosan complex and visible light. Salmonella cells were incubated with chlorophyllin-chitosan complex (0.001 % chlorophyllin and 0.1 % chitosan) for different times (5-60 min) and then illuminated with visible light (λ=405 nm, He=38 J/cm2). Inactivation curves and post-treatment regrowth curves were built based on microbiological viability tests and data were fitted to ten inactivation and two regrowth models. The photoactivated complex reduced Salmonella population, which were unable to regrow. Weibull and Baranyi models were the best to describe the inactivation and regrowth kinetics respectively. In conclusion, data from the kinetic analysis and predictive modelling confirmed that photoactivated chlorophyllin-chitosan complex is a promising non-thermal approach for inactivation of Gram-negative pathogens, since no bacterial regrowth after treatment has been predicted.

Publisher

Faculty of Food Technology and Biotechnology - University of Zagreb

Subject

Industrial and Manufacturing Engineering,General Chemical Engineering,Food Science,Biotechnology

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