Abstract：
:In this investigation, the resistance of enterotoxigenic Staphylococcus aureus to short-wave ultraviolet light (UV-C) and to combined UV C-heat (UV-H) treatments in buffers and in liquid foods with different physicochemical characteristics was studied. Microbial resistance to UV-C varied slightly among the S. aureus strains tested. The UV-C resistance of S. aureus increased in the entry of stationary growth phase, which in part was due to the expression of the alternative sigma factor σ(B). The UV-C resistance of S. aureus was independent of the treatment medium's pH and water activity, but it decreased exponentially as the absorption coefficient increased. UV-C bactericidal efficacy in liquids of high absorption coefficients was improved synergistically when combined with a mild heat treatment at temperatures ranging from 50.0 to 57.5 °C. pH of the treatment medium modified the lethality of UV-H treatments and therefore the temperature of maximum synergy. The advantage of combined UV-H treatments was demonstrated in fruit juices and vegetable and chicken broths, inactivating 5 Log₁₀ cycles of S. aureus by applying UV-C treatments of 27.1 mJ/L for 3.6 min at 52.5 °C or 13.6 mJ/L for 1.8 min at 55.0 °C.
journal_name
Int J Food Microbioljournal_title
International journal of food microbiologyauthors
Gayán E,García-Gonzalo D,Alvarez I,Condón Sdoi
10.1016/j.ijfoodmicro.2013.12.003subject
Has Abstractpub_date
2014-02-17 00:00:00pages
30-9eissn
0168-1605issn
1879-3460pii
S0168-1605(13)00570-9journal_volume
172pub_type
杂志文章abstract：:Aseptic ultra-high-temperature (UHT)-type processed food products (e.g., milk or soup) are ready to eat products which are consumed extensively globally due to a combination of their comparative high quality and long shelf life, with no cold chain or other preservation requirements. Due to the inherent microbial vulne...
journal_title：International journal of food microbiology
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journal_title：International journal of food microbiology
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journal_title：International journal of food microbiology
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journal_title：International journal of food microbiology
pub_type： 杂志文章
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