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Characterization of pulsed light tre...

Pollock, Allison Maureen.

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Characterization of pulsed light treatment on the shelf-life and safety of vacuum packaged cold smoked salmon.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Characterization of pulsed light treatment on the shelf-life and safety of vacuum packaged cold smoked salmon./
Author:	Pollock, Allison Maureen.
Description:	112 p.
Notes:	Source: Masters Abstracts International, Volume: 46-03, page: 1358.
Contained By:	Masters Abstracts International46-03.
Subject:	Agriculture, Food Science and Technology. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=MR32774
ISBN:	9780494327746

Characterization of pulsed light treatment on the shelf-life and safety of vacuum packaged cold smoked salmon.
Pollock, Allison Maureen.

Characterization of pulsed light treatment on the shelf-life and safety of vacuum packaged cold smoked salmon. - 112 p.

Source: Masters Abstracts International, Volume: 46-03, page: 1358.

Thesis (M.Sc.)--McGill University (Canada), 2007.

Listeria monocytogenes is a common post-processing contaminant in ready-to-eat vacuum packaged (VP) cold smoked salmon. Since this psychrotrophic pathogen can grow at refrigerated temperatures (&sim;4°C), other safety barriers in addition to temperature are needed to ensure the continued safety of VP cold smoked salmon. One such novel barrier could be the pulsed light (PL) treatment of the product prior to packaging or treating the product through a transparent package.

ISBN: 9780494327746Subjects--Topical Terms:

1017813
Agriculture, Food Science and Technology.

Characterization of pulsed light treatment on the shelf-life and safety of vacuum packaged cold smoked salmon.
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020 $a 9780494327746
035 $a (UMI)AAIMR32774
035 $a AAIMR32774
040 $a UMI $c UMI
100 1 $a Pollock, Allison Maureen. $3 1278347
245 1 0 $a Characterization of pulsed light treatment on the shelf-life and safety of vacuum packaged cold smoked salmon.
300 $a 112 p.
500 $a Source: Masters Abstracts International, Volume: 46-03, page: 1358.
502 $a Thesis (M.Sc.)--McGill University (Canada), 2007.
520 $a Listeria monocytogenes is a common post-processing contaminant in ready-to-eat vacuum packaged (VP) cold smoked salmon. Since this psychrotrophic pathogen can grow at refrigerated temperatures (&sim;4°C), other safety barriers in addition to temperature are needed to ensure the continued safety of VP cold smoked salmon. One such novel barrier could be the pulsed light (PL) treatment of the product prior to packaging or treating the product through a transparent package.
520 $a Pulsed light destruction kinetics of L. monocytogenes were evaluated while dispensed into a liquid media, on the surface of a general purpose agar and on the surface of cold smoked salmon. Results showed that PL technology was an effective surface sanitation method (a decimal reduction time or D-value of 0.91, 1.37 and 2.25 s exposure of PL at 800, 700 and 600 V, respectively, and a resulting z value of 500 V) on the agar plate. However, it had only a limited success when applied to liquid samples as well as directly on the surface of cold smoked salmon (D-value ranged from 93 s to 24 min).
520 $a Sensory quality of VP cold smoked salmon subjected to selected PL treatments was monitored during storage for 14 days at 4°C. Both color and odor scores remained within acceptable limits over the 14 day storage period. Subsequent challenge studies were carried out with L. monocytogenes applied on VP cold smoked salmon. An overall reduction in counts was observed in samples stored at 4°C over 28 days; however, after PL treatment (day 0), there was no significant reduction in counts. Color and odor scores maintained acceptable values over 14 days. Additional experiments were carried out to determine the effects of (1) 1.5% salt, (2) 6% oil, (3) a representative salmon media and (4) background microflora (lactic acid bacteria) on the PL inactivation of L. monocytogenes. All of these factors significantly affected the destruction of L. monocytogenes by increasing the D-value (adding resistance to pulsed light destruction).
520 $a Overall, these studies have shown that PL treatment in combination with low temperature storage (4°C) has the potential to extend the shelf-life of VP cold smoked salmon products without compromising sensory quality. However further investigation into higher treatment voltages is necessary in order to achieve a higher target kill of L. monocytogenes.
590 $a School code: 0781.
650 4 $a Agriculture, Food Science and Technology. $3 1017813
690 $a 0359
710 2 $a McGill University (Canada). $3 1018122
773 0 $t Masters Abstracts International $g 46-03.
790 $a 0781
791 $a M.Sc.
792 $a 2007
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=MR32774