کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4363405 1301555 2009 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Effect of fat content on survival of Listeria monocytogenes during simulated digestion of inoculated beef frankfurters stored at 7 °C
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک دانش تغذیه
پیش نمایش صفحه اول مقاله
Effect of fat content on survival of Listeria monocytogenes during simulated digestion of inoculated beef frankfurters stored at 7 °C
چکیده انگلیسی

Potential effects of the fat content of frankfurters on the gastrointestinal survival of Listeria monocytogenes were investigated. At various stages of storage (7 °C, up to 55 days), inoculated frankfurters of low (4.5%) and high (32.5%) fat content were exposed to a dynamic gastrointestinal model (37 °C) and L. monocytogenes counts were determined at intervals during exposure in each gastrointestinal compartment (gastric, GC; intestinal, IC). Bacterial survival curves in each compartment were fitted with the Baranyi and Roberts mathematical model. L. monocytogenes populations on low- and high-fat frankfurters exceeded 8.0 log CFU/g at 39 and 55 days of storage, respectively. Major declines in populations occurred after 60 min on low-fat frankfurters in the GC, with reductions of 2.6 to >7.2 log CFU/g at 120 min on days 1 and 39 of storage, respectively. L. monocytogenes reductions in high-fat frankfurters ranged from 1.6 (day-1) to 5.2 (day-55) log CFU/g. Gastric inactivation rates were 0.080–0.194 and 0.030–0.097 log CFU/g/min for low- and high-fat samples, respectively. Since gastric emptying began while the gastric pH was >5, initial counts (enumerated 30 min after ingestion) reaching the IC depended on initial contamination levels on each product, which increased during storage. Subsequent reductions during the intestinal challenge were 0.1–1.4 log CFU/g. Findings indicated protective effects of fat against gastric destruction of L. monocytogenes. However, since the effects of fat were observed mainly at later stages of gastric exposure, they did not influence numbers of viable cells reaching the IC.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Food Microbiology - Volume 26, Issue 5, August 2009, Pages 483–490
نویسندگان
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