Inhibition of Listeria monocytogenes growth by the lactoperoxidase-thiocyanate-H2O2 antimicrobial system
Autor: | Michael G. Johnson, G R Siragusa |
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Rok vydání: | 1989 |
Předmět: |
food.ingredient
medicine.disease_cause Applied Microbiology and Biotechnology Microbiology chemistry.chemical_compound food Listeria monocytogenes Potassium thiocyanate Skimmed milk medicine Animals Lactoperoxidase Food science Hydrogen peroxide Ecology biology Thiocyanate Chemistry Temperature Hydrogen Peroxide biology.organism_classification Culture Media Milk Peroxidases biology.protein Thiocyanates Bacteria Research Article Food Science Biotechnology Peroxidase |
Zdroj: | Applied and Environmental Microbiology. 55:2802-2805 |
ISSN: | 1098-5336 0099-2240 |
DOI: | 10.1128/aem.55.11.2802-2805.1989 |
Popis: | The lactoperoxidase-thiocyanate-H2O2 system (LP system), consisting of lactoperoxidase (0.37 U/ml), KSCN (0.3 mM), and H2O2 (0.3 mM), delayed but did not prevent growth of L. monocytogenes Scott A at 5, 10, 20, and 30 degrees C in broth and at 20 degrees C in milk. The net lag periods determined spectrophotometrically varied inversely with temperature and were shorter at 5 and 10 degrees C for cultures from shaken versus from statically grown inocula. Lag periods for cultures from shaken and statically grown inocula, respectively, were 73 and 98 h at 5 degrees C, 22 and 32 h at 10 degrees C, both 8.9 h at 20 degrees C, and both 2.8 h at 30 degrees C. After the lag periods, the maximum specific growth rates were similar for each of the three treatments (complete LP system, H2O2 alone, or control broth) at 5, 10, and 20 degrees C and were 0.06 to 0.08, 0.09 to 0.1, and 0.32 to 0.36/h, respectively. At 20 degrees C in sterile reconstituted skim milk, the LP system restricted growth of Scott A, with log CFU counts per ml at 0, 36, and 68 h being 5.7, 6.4 and 7.9 (versus 5.7, 9.8, and 11.2 for controls). Possible explanations for the decreased lag times observed for cultures from aerobically grown inocula are discussed. |
Databáze: | OpenAIRE |
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