BEHAVIOUR OF LISTERIA MONOCYTOGENES ON VACUUM-PACKED BEEF.

Type of article: Article

Summary

VACUUM-PACKED BEEF WITH A PH OF LOWER THAN 5.8 WHICH HAD BEEN ARTIFICIALLY CONTAMINATED WITH 1,000 LISTERIA MONOCYTOGENES / CM2 SHOWED NO CHANGE IN ITS LISTERIAE COUNT DURING 9 WEEKS STORAGE AT 275 AND 277 K (2 AND 4 DEG C). STORAGE AT 280 K (7 DEG C) AT A PH OF 5.8 LED TO A RISE IN THE LISTERAE COUNT BY TWO POWERS OF TEN BETWEEN THE 3RD AND THE 7TH DAY. VACUUM-PACKED BEEF WITH A PH OF HIGHER THAN 6.0 UNDERWENT A GROWTH OF LISTERIAE OF ABOUT ONE POWER OF TEN DURING THE FIRST WEEK OF STORAGE AT 275 AND 277 K. AT A STORAGE TEMPERATURE OF 280 K THE L. MONOCYTOGENES COUNT INCREASED DURING 3 DAYS BY ABOUT ONE POWER OF TEN AND BY ABOUT THREE POWERS OF TEN AT 283 K (10 DEG C). IN SAMPLES WITH A PH BELOW 5.8 AND HELD AT 275 AND 277 K THE LACTIC-ACID BACTERIA DEVELOPED WITHIN A FEW DAYS TO BECOME THE DOMINANT FLORA AND SUPPRESSED THE GROWTH OF L. MONOCYTOGENES, BUT BROCHOTHRIX THERMOSPHACTA AND THE ENTEROBACTERIACEAE WERE DOMINANT ON VACUUM-PACKED 6.0).

Details

Original title: BEHAVIOUR OF LISTERIA MONOCYTOGENES ON VACUUM-PACKED BEEF.
Record ID : 1992-0672
Languages: English
Source: Fleischwirtschaft - vol. 71 - n. 4
Publication date: 1991/04
Document available for consultation in the library of the IIR headquarters only.

Links

See the source

Indexing

Themes: Packaging;
Meat and meat products
Keywords: Microbiology; Listeria; Vacuum; Meat; Chilling; Beef; Pathogen; Packaging