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Antimicrobial action of selected pla...

Weinsetel, Natalia A.

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Antimicrobial action of selected plant-derived compounds against Listeria monocytogenes.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Antimicrobial action of selected plant-derived compounds against Listeria monocytogenes./
Author:	Weinsetel, Natalia A.
Description:	127 p.
Notes:	Adviser: Aubrey F. Mendonca.
Contained By:	Dissertation Abstracts International67-12B.
Subject:	Agriculture, Food Science and Technology. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3244381

Antimicrobial action of selected plant-derived compounds against Listeria monocytogenes.
Weinsetel, Natalia A.

Antimicrobial action of selected plant-derived compounds against Listeria monocytogenes. - 127 p.

Adviser: Aubrey F. Mendonca.

Thesis (Ph.D.)--Iowa State University, 2006.

Listeria monocytogenes causes listeriosis, a disease that can be fatal to immunocompromised individuals. Due to the number of outbreaks, recalls, and deaths linked to the consumption of contaminated ready-to-eat (RTE) foods, the United States government issued a directive for the control of L. monocytogenes in the production of RTE meats including the use of a post-lethality treatment and/or the addition of a growth inhibitor. Several methods to inhibit pathogenic bacteria in RTE foods are currently utilized. One method actively being studied involves the use of natural plant products as food antimicrobials. The present study evaluated the effectiveness of plant-derived compounds in controlling the growth of L. monocytogenes . Four antimicrobials (cranberry-CB, grape seed-GS, oregano-OR, and green tea-GT) were evaluated in culture media and two (CB and GS in combination with sodium lauryl sulfate-SLS) as dips for frankfurters (formulated with or without sodium lactate-SL). In culture media, GS had the highest inhibitory activity at both storage temperatures (4 and 10°C) and at all concentrations tested. In frankfurters without SL, 4 and 6 log reductions in the initial numbers of the pathogen were obtained with CB (+SLS) and GS (+SLS), respectively, and growth of survivors was inhibited up to day 14. In frankfurters with SL, a similar bacteriocidal effect was obtained with both CB (+SLS) and GS (+SLS) but growth of survivors was prevented for 90 days. The survival of acid adapted L. monocytogenes in culture media containing CB and GS was also assessed. Acid adapted cells were less affected by CB than the non-acid adapted at weeks 1 and 2; no differences in sensitivity to GS was observed between acid adapted and non-acid adapted cells. Lastly, preliminary evidence on the mode of action of GS on L. monocytogenes cells using transmission electron microscopy indicated possible damage to the cytoplasmic membrane.Subjects--Topical Terms:

1017813
Agriculture, Food Science and Technology.

Antimicrobial action of selected plant-derived compounds against Listeria monocytogenes.
LDR:02813nam 2200265 a 45 001 964119
005 20110901
008 110901s2006 eng d
035 $a (UMI)AAI3244381
035 $a AAI3244381
040 $a UMI $c UMI
100 1 $a Weinsetel, Natalia A. $3 1287187
245 1 0 $a Antimicrobial action of selected plant-derived compounds against Listeria monocytogenes.
300 $a 127 p.
500 $a Adviser: Aubrey F. Mendonca.
500 $a Source: Dissertation Abstracts International, Volume: 67-12, Section: B, page: 6792.
502 $a Thesis (Ph.D.)--Iowa State University, 2006.
520 $a Listeria monocytogenes causes listeriosis, a disease that can be fatal to immunocompromised individuals. Due to the number of outbreaks, recalls, and deaths linked to the consumption of contaminated ready-to-eat (RTE) foods, the United States government issued a directive for the control of L. monocytogenes in the production of RTE meats including the use of a post-lethality treatment and/or the addition of a growth inhibitor. Several methods to inhibit pathogenic bacteria in RTE foods are currently utilized. One method actively being studied involves the use of natural plant products as food antimicrobials. The present study evaluated the effectiveness of plant-derived compounds in controlling the growth of L. monocytogenes . Four antimicrobials (cranberry-CB, grape seed-GS, oregano-OR, and green tea-GT) were evaluated in culture media and two (CB and GS in combination with sodium lauryl sulfate-SLS) as dips for frankfurters (formulated with or without sodium lactate-SL). In culture media, GS had the highest inhibitory activity at both storage temperatures (4 and 10°C) and at all concentrations tested. In frankfurters without SL, 4 and 6 log reductions in the initial numbers of the pathogen were obtained with CB (+SLS) and GS (+SLS), respectively, and growth of survivors was inhibited up to day 14. In frankfurters with SL, a similar bacteriocidal effect was obtained with both CB (+SLS) and GS (+SLS) but growth of survivors was prevented for 90 days. The survival of acid adapted L. monocytogenes in culture media containing CB and GS was also assessed. Acid adapted cells were less affected by CB than the non-acid adapted at weeks 1 and 2; no differences in sensitivity to GS was observed between acid adapted and non-acid adapted cells. Lastly, preliminary evidence on the mode of action of GS on L. monocytogenes cells using transmission electron microscopy indicated possible damage to the cytoplasmic membrane.
590 $a School code: 0097.
650 4 $a Agriculture, Food Science and Technology. $3 1017813
650 4 $a Biology, Microbiology. $3 1017734
690 $a 0359
690 $a 0410
710 2 0 $a Iowa State University. $3 1017855
773 0 $t Dissertation Abstracts International $g 67-12B.
790 $a 0097
790 1 0 $a Mendonca, Aubrey F., $e advisor
791 $a Ph.D.
792 $a 2006
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3244381