The antilisterial activity of monocaprylin (MC) and its combination with acetic acid (AA) on frankfurters was investigated. Each frankfurter was surface inoculated with a three-strain mixture of Listeria monocytogenes to obtain an inoculation level of 4.0 log CFU per frankfurter, and then dipped for 35 s in sterile deionized water (45 or 50°C) containing 1% ethanol (control), 50 mM MC plus 1% ethanol, 1% AA plus 1% ethanol, or 50 mM MC plus 1% AA plus 1% ethanol. Samples were vacuum packaged, stored at 4°C for 77 days, and analyzed for L. monocytogenes. Sensory odor and color of frankfurters were evaluated using a 9-point hedonic scale. Color was also objectively measured using the Minolta Chroma Meter. From day 0 to day 77, population counts of L. monocytogenes on frankfurters dipped in antimicrobial solutions at 50°C were consistently lower than the control counts. Similar results were observed for samples treated at 45°C. However, L. monocytogenes grew readily on control samples at both temperatures. Dipping of frankfurters in antimicrobial solutions (45 or 50°C) significantly reduced (P < 0.05) the populations of L. monocytogenes. After 70 days of storage, L. monocytogenes was completely killed in samples dipped in MC+AA solution at 50°C. The antimicrobial treatments did not affect the odor or color of the samples (P > 0.05). Overall, results indicated that dipping of frankfurters with MC reduced L. monocytogenes, and inclusion of AA further enhanced MC antilisterial activity, without any negative effect on odor or color.
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Research Article|
July 01 2007
Inactivation of Listeria monocytogenes on Frankfurters by Monocaprylin Alone or in Combination with Acetic Acid
MARILYN GARCIA;
MARILYN GARCIA
Department of Animal Science, Unit-4040, University of Connecticut, Storrs, Connecticut 06269, USA
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MARY ANNE ROSHNI AMALARADJOU;
MARY ANNE ROSHNI AMALARADJOU
Department of Animal Science, Unit-4040, University of Connecticut, Storrs, Connecticut 06269, USA
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MANOJ KUMAR MOHAN NAIR;
MANOJ KUMAR MOHAN NAIR
Department of Animal Science, Unit-4040, University of Connecticut, Storrs, Connecticut 06269, USA
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THIRUNAVUKKARASU ANNAMALAI;
THIRUNAVUKKARASU ANNAMALAI
Department of Animal Science, Unit-4040, University of Connecticut, Storrs, Connecticut 06269, USA
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SUMAN SURENDRANATH;
SUMAN SURENDRANATH
Department of Animal Science, Unit-4040, University of Connecticut, Storrs, Connecticut 06269, USA
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SEOK LEE;
SEOK LEE
Department of Animal Science, Unit-4040, University of Connecticut, Storrs, Connecticut 06269, USA
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THOMAS HOAGLAND;
THOMAS HOAGLAND
Department of Animal Science, Unit-4040, University of Connecticut, Storrs, Connecticut 06269, USA
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DAVID DZUREC;
DAVID DZUREC
Department of Animal Science, Unit-4040, University of Connecticut, Storrs, Connecticut 06269, USA
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CAMERON FAUSTMAN;
CAMERON FAUSTMAN
Department of Animal Science, Unit-4040, University of Connecticut, Storrs, Connecticut 06269, USA
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KUMAR VENKITANARAYANAN
KUMAR VENKITANARAYANAN
*
Department of Animal Science, Unit-4040, University of Connecticut, Storrs, Connecticut 06269, USA
* Author for correspondence. Tel: 860-486-0947; Fax: 860-486-4375; E-mail: kumar.venkitanarayanan@uconn.edu.
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J Food Prot (2007) 70 (7): 1594–1599.
Article history
Received:
October 20 2006
Accepted:
February 10 2007
Citation
MARILYN GARCIA, MARY ANNE ROSHNI AMALARADJOU, MANOJ KUMAR MOHAN NAIR, THIRUNAVUKKARASU ANNAMALAI, SUMAN SURENDRANATH, SEOK LEE, THOMAS HOAGLAND, DAVID DZUREC, CAMERON FAUSTMAN, KUMAR VENKITANARAYANAN; Inactivation of Listeria monocytogenes on Frankfurters by Monocaprylin Alone or in Combination with Acetic Acid. J Food Prot 1 July 2007; 70 (7): 1594–1599. doi: https://doi.org/10.4315/0362-028X-70.7.1594
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