| Inactivation of Staphylococcus aureus in milk using flow-through pulsed UV-light treatment system. | |
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MedLine Citation:
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PMID: 17995646 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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This study investigated the efficacy of pulsed UV-light for continuous-flow milk treatment for the inactivation of Staphylococcus aureus, a pathogenic microorganism frequently associated with milk safety concerns. Pulsed UV light is an emerging technology, which can be used for the inactivation of this pathogen in milk in a relatively short time. Pulsed UV light damages the DNA of the bacteria by forming thymine dimers that lead to bacterial death. The effect of sample distance from the quartz window of the UV-light source, number of passes, and flow rate was investigated. A response surface methodology was used for the design and analysis of experiments. Milk was treated at 5-, 8-, or 11-cm distance from a UV-light strobe at 20, 30, or 40 mL/min flow rate and treated up to 3 times by recirculation of milk to assess the effect of the number of passes on inactivation efficiency. Log10 reductions varied from 0.55- to 7.26-log10 CFU/mL. Complete inactivation was obtained in 2 cases and no growth was observed following an enrichment protocol. Predicted results were in agreement with the experimental data. Overall, this work demonstrates that pulsed UV-light has a potential for inactivation of milk pathogens. |
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Authors:
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K Krishnamurthy; A Demirci; J M Irudayaraj |
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Publication Detail:
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Type: Journal Article; Research Support, U.S. Gov't, Non-P.H.S. |
Journal Detail:
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Title: Journal of food science Volume: 72 ISSN: 1750-3841 ISO Abbreviation: J. Food Sci. Publication Date: 2007 Sep |
Date Detail:
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Created Date: 2007-11-12 Completed Date: 2008-01-25 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0014052 Medline TA: J Food Sci Country: United States |
Other Details:
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Languages: eng Pagination: M233-9 Citation Subset: IM |
Affiliation:
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Dept. of Food and Animal Sciences, Alabama A&M Univ., Normal, AL 35762, USA. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Animals Colony Count, Microbial Consumer Product Safety DNA, Bacterial / radiation effects Dose-Response Relationship, Radiation Food Contamination / prevention & control Food Handling / methods Food Irradiation / methods* Food Microbiology Food Preservation / methods* Humans Milk / microbiology* Staphylococcus aureus / growth & development, radiation effects* Time Factors Ultraviolet Rays* |
| Chemical | |
Reg. No./Substance:
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0/DNA, Bacterial |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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