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Antilisterial effects of ethanolic extracts of some edible Thai plants on refrigerated cooked pork

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Author(s): Siriporn Stonsaovapak

Journal: Maejo International Journal of Science and Technology
ISSN 1905-7873

Volume: 4;
Issue: 03;
Start page: 540;
Date: 2010;
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Keywords: antilisterial activity | edible Thai plants | Listeria Monocytogenes | Micromelum minutum | Artocarpus heterophyllus

ABSTRACT
Listeria monocytogenes is a major foodborne pathogen responsible for the disease listeriosis.Effective methods for reducing L. monocytogenes in foods would reduce the likelihood of foodborneoutbreaks of listeriosis and decrease economic losses to the food industry. Crude ethanolic extracts from 50 edible Thai plants were screened for inhibitory effects on isolated strains and type strains of L.monocytogenes by the well assay technique. Ethanolic extracts of Micromelum minutum, Artocarpus heterophyllus, Piper retrofractum and Cucurbita moschata, which showed listerial growth inhibition,were applied to cooked pork to determine their antimicrobial activities against L. monocytogenes. Pork was cooked to an internal temperature of 85C, allowed to cool to 8C and then treated by surface application with the plant extracts. Low (102 cfu g-1) or high (105 cfu g-1) population of L.monocytogenes were applied and samples were stored at 4C for up to 7 days. M. minutum and A.heterophyllus extracts were most effective in inhibiting the growth of the pathogen. These results suggested that some edible Thai plant extracts might be useful as antimicrobials in cooked, ready-to-eatpork.
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