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J Dairy Res ; 85(2): 232-237, 2018 May.
Article in English | MEDLINE | ID: mdl-29785903

ABSTRACT

The present study focused on the utilisation of High Intensity Light Pulses (HILP) treatment to preserve mozzarella cheese. First, the susceptibility of Pseudomonas fluorescens and Enterobacteriaceae to HILP (fluences from 0·39 to 28·0 J/cm2) in a transparent liquid was evaluated (in-vitro tests). Afterwards, the effects on inoculated mozzarella cheese were also assessed. Then untreated (Control) and HILP treated samples were packaged and stored at 10 °C for 2 weeks. Enterobacteriaceae, Pseudomonas spp. and pH were monitored during storage. In a transparent liquid (in-vitro tests) there was a significant microbial inactivation just with 2 s of treatment. On the inoculated cheese a relevant microbial reduction of about 1 log cycle was observed, according to the exposure to the treatments. For Pseudomonas spp. in particular, in the treated samples, the microbiological acceptability limit (106 cfu/g) was never reached after 2 weeks of refrigerated storage. To sum up, the efficacy of this treatment is very interesting because a microbial reduction was observed in treated samples. HILP treatment is able to control the microbial growth and may be considered a promising way to decontaminate the surface of mozzarella cheese.


Subject(s)
Cheese/microbiology , Food Microbiology/methods , Food Preservation/methods , Colony Count, Microbial , Enterobacteriaceae/cytology , Enterobacteriaceae/radiation effects , Hydrogen-Ion Concentration , Photochemical Processes , Pseudomonas/cytology , Pseudomonas/radiation effects , Pseudomonas fluorescens/cytology , Pseudomonas fluorescens/radiation effects
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