Modeling the Inactivation of Listeria innocua and Escherichia coli in fresh-cut tomato treated with pulsed light
Data de publicació2017-02
MetadadesMostra el registre d'unitat complet
The effectiveness of pulsed light (PL) treatments to inhibit microorganisms on fresh-cut tomatoes (Lycopersicon esculentum Mill., cv. Daniela) was investigated. Tomato slices inoculated with Escherichia coli or Listeria innocua were exposed to PL treatments (4, 6, or 8 J cm−2 fluence) and kept cold
at 4 °C for 20 days. L. innocua and E. coli counts, gases in the headspace of the containers (O2 and CO2), pH, titratable acidity, and soluble solid content were monitored throughout the cold storage. The PL treatments reduced significantly (p < 0.05) initial loads of both microbes. The effect of the PL fluence on the survival number of microoganisms was described by a log-linear model (R2 = 0.849–0.999). At any fixed time within the cold storing, the microbial counts for untreated samples were always higher than those cut tomatoes that had been previously PL-treated. The behavior of L. innocua and E. coli during the storage were well adjusted (R2 > 0.930) by Gompertzian models; the studied microorganisms exhibited different patterns during the storage period. On the other hand, O2 and CO2 partial pressures in containers with fresh-cut tomatoes were also significantly affected by PL treatments (p < 0.05). The highest PL fluence caused the greatest changes of O2 and CO2 contents. In addition, the application of PL triggered an acceleration of the O2 consumption during the cold stage. PL treatments might be used to effectively extend the safety of fresh-cut tomatoes over 12 days of storage against E. coli and L. innocua growth.
És part deFood And Bioprocess Technology, 2017, vol. 10, núm. 2, p. 266-274
Mostrant elements relacionats per títol, autor i matèria.
Combined effects of malic acid dip and pulsed light treatments on the inactivation of Listeria innocua and Escherichia coli on fresh-cut produce Ramos-Villarroel, Ana; Martín Belloso, Olga; Soliva-Fortuny, Robert (Elsevier, 2015-06-00)The application of pulsed light (PL) in combination with malic acid (MA) dips was evaluated regarding the inactivation of Listeria innocua or Escherichia coil inoculated on different fresh-cut products (avocado, watermelon ...
Valdivia Nájar, Carlos Guillermo; Martín Belloso, Olga; Soliva-Fortuny, Robert (Elsevier, 2018)The effect of pulsed light (PL) treatments at fluences of 4, 6 or 8 J·cm-2 on microbial growth, weight loss, pectinmethyl esterase (PME) and polygalacturonase (PG) activities of fresh-cut tomatoes was evaluated through 20 ...
Bacterial inactivation and quality changes of fresh-cut avocados as affected by intense light pulses of specific spectra Ramos-Villarroel, Ana; Aron-Maftei, Nicoleta; Martín Belloso, Olga; Soliva-Fortuny, Robert (John Wiley & Sons, 2014-01-00)Intense light pulses (ILP) treatments have good prospects for becoming an alternative to traditional thermal methods for decontamination of food surfaces. The aim of this work was to evaluate which ranges of the light ...