Effect of selected antimicrobial compounds on the radiosensitization of Salmonella Typhi in ground beef.
OBJECTIVE
In this study, we extended our previous work to determine the efficiency of antimicrobial compounds in increase of relative radiosensitivity of Salmonella Typhi in medium fat ground beef (23% fat) by testing 41 different essential oils (EOs), oleoresins and food sauces.


RESULTS
Ground beef samples inoculated with Salmonella Typhi (10(6) CFU g(-1)) were treated with each antimicrobial compound at a concentration of 0.5% (w/w). Then, the samples (25 g each) were packaged under air and irradiated in a (60)Co irradiator at doses from 0 to 1.75 kGy. Radiosensitivity was evaluated by calculating relative radiation sensitivity, defined as the ratio of radiation D(10) value in the absence/presence of antimicrobial compound.


CONCLUSIONS
Depending on the compound tested, the addition of antimicrobial compound decreased the D(10) value of Salmonella Typhi, resulting in an increase of the radiation sensitivity up to more than four times. Among these antimicrobial compounds, Chinese cinnamon EO, clove EO and trans-cinnamaldehyde were most effective to increase the radiosensitivity of Salmonella Typhi in ground beef.


CONCLUSIONS
These observations demonstrate that some active compounds can function as radiosensitizers of Salmonella Typhi.
Canadian Irradiation Center, Research Laboratory in Sciences Applied to Food, INRS-Institut Armand-Frappier, Laval, QC, Canada.
M
M
Turgis
J
J
Han
M
M
Millette
S
S
Salmieri
J
J
Borsa
M
M
Lacroix
D000818:Animals; D000900:Anti-Bacterial Agents / Q000494:pharmacology*; D002417:Cattle; D005514:Food Irradiation; D005516:Food Microbiology; D005519:Food Preservation / Q000379:methods*; D005720:Gamma Rays; D008462:Meat-Packing Industry / Q000379:methods*; D050296:Microbial Viability / Q000187:drug effects / Q000528:radiation effects; D009822:Oils, Volatile / Q000494:pharmacology; D011836:Radiation Tolerance; D012485:Salmonella typhi / Q000187:drug effects* / Q000528:radiation effects*
D000900:Anti-Bacterial Agents; D009822:Oils, Volatile