survival of unstressed and acid-, cold-, and starvation-stress-adapted listeria monocytogenes in ham extract with hops beta acids and consumer acceptability of hba on ready-to-eat ham

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2015
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Abstract
The efficacy of hops beta acids (HBA) against unstressed and stress-adapted Listeria monocytogenes in ham extract and the consumers’ acceptability of HBA on ready-to-eat (RTE) hams were investigated. Unstressed or acid-, cold-, or starvation-stress-adapted L. monocytogenes was inoculated (1.3–1.5 log CFU/mL) into 10% ham extract, without (control) or with HBA (4.44 or 10.0 µg/mL). Survival/growth of the pathogen during storage (7.2°C, 26 days) was monitored periodically. Sensory evaluation (30 participants, 9-point hedonic scale) was performed with hams dipped into 0.05, 0.11, and 0.23% HBA solution. Ham extracts without HBA supported rapid growth of unstressed and stress-adapted cells with growth rates of 0.39–0.71 log CFU/mL/day and lag phases of 0–3.26 days. HBA inhibited growth of unstressed L. monocytogenes by slowing (P<0.05) growth rate (0.24–0.29 log CFU/mL/day) and increasing (P<0.05) length of the lag phase (3.49–12.98 days) compared to control. Acid-, cold-, or starvation-stress-adapted cells showed cross protection against HBA with greater (P<0.05) growth rates (0.44–0.66 log CFU/mL/day) and similar or shorter lag phases (0–5.44 days) than unstressed cells. HBA did not (P>0.05) affect sensory attributes of RTE ham. These results are useful for RTE meat processors to develop operational protocols using HBA to control L. monocytogenes.
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wang2015biomedsurvival Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Li Wang, Cangliang Shen
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Journal spectrochimica acta - part a: molecular and biomolecular spectroscopy
Year 2015
DOI
10.1155/2015/817042
URL
http://dx.doi.org/10.1155/2015/817042
Keywords
Medicine

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