Using gamma irradiation and low temperature on microbial decontamination of red meat in Iran (original) (raw)
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Food Control, 2006
Irradiation is considered one of the most efficient technological processes for the reduction of microorganisms in food. It can be used to improve the safety of food products, and to extend their shelf lives. The aim of this study was to evaluate the effects of gamma irradiation and frozen storage as a combination process for improvement of chicken meat shelf life. Broiler chicken were treated with 0 (non irradiated), 0.75, 3.0, and 5.0 kGy of gamma irradiation and held frozen for 9 months. The control and irradiated samples were stored at À18°C and underwent microbial analysis, chemical characteristics and sensory evaluation at 3 months intervals. Microbial analysis indicated that irradiation and freezing storage had a significant effect (P < 0.05) on the reduction of microbial loads. There was no significant difference in sensory quality and chemical characteristics during freezing storage in chicken meat. The combination of frozen storage plus irradiation resulted in greater overall reductions on microbial loads, extending shelflife of chicken meat for commercial application and critical condition.
Radiation Physics and Chemistry, 2008
In this research, the effect of gamma irradiation on the inactivation of Escherichia coli O157:H7 (ATCC 33150), Staphylococcus aureus (ATCC 2392) and Salmonella typhimurium (NRRL 4463) inoculated into Tekirdag meatballs was investigated. The meatball samples were inoculated with pathogens and irradiated at the absorbed doses of 1, 2.2, 3.2, 4.5 and 5.2 kGy. E. coli O157:H7 count in 1 kGy irradiated meatballs stored in the refrigerator for 7 days was detected to be 4 log cfu/g lower than the count in nonirradiated samples (p<0.05). S. aureus counts were decreased to 4 log cfu/g after being exposed to irradiation at a dose of 1 kGy. Although it was ineffective on elimination of S. typhimurium, irradiation at a dose of 3.2 kGy reduced E. coli O157:H7 and S. aureus counts under detectable values in the meatballs. However, none of the test organisms were detected in the samples after irradiation with 4.5 kGy doses.
Improvement of the Microbiological Safety of Two Chilled Semi-Prepared Meals by Gamma Irradiation
Summary Experimental batches of a stuffed pasta product, tortellini, and slightly pre-fried bread- ed reconstituted turkey steaks with cheese and ham filling, Cordon Bleu, were prepared according to commercial recipes, then inoculated with 104 CFU/g of Staphylococcus aureus (in case of tortellini) and with 106 CFU/g of Listeria monocytogenes (in case of Cordon Bleu) prior to packing in plastic bags under a gas atmosphere of 20 % CO2 and 80 % N2. The in- oculated packages were irradiated at 3 kGy (tortellini) and 2 kGy (Cordon Bleu) with a 60 Co radiation source. The applied radiation doses were sensorially acceptable for these products. The experimental batches of tortellini were stored at 15 °C, while the Cordon Bleu samples were stored at 5 and 9 °C. Unirradiated samples were kept together with the respective irradiated ones. Storage was continued for 4 weeks and microbiological tests were performed before and after the irradiation, and subsequently after every seven days. Besides...
Effects of gamma irradiation on microbial load and quality characteristics of veal
Advanced Biomedical Research, 2013
Background: Veal is a rich nutrient medium that provides a suitable environment for proliferation of veal spoiling microorganisms and common food-borne pathogens. In this study, the effects of irradiation on the veal microbiological quality and half life of minced beef during chilled storage was investigated. Materials and Methods: Twenty samples of minced veal were irradiated with doses of 2, 5, 7, and 10 kGy (Cobalt-60, gamma cell 220) and evaluated for their microbiological quality up to 10 days. Results: The results showed that gamma irradiation reduced the number of microorganisms in all the irradiated minced veal samples, with 2, 5, 7, and 10 kGy (P < 0.01). Moreover, the half life of the samples were increased considerably (P < 0.01). In addition, the results indicated that there was a significant difference in the number of coliformes between untreated and irradiated samples (P < 0.05). While, Staphylococcus aureus could not be detected in the irradiated samples with doses of 7 and 10 kGy. Conclusion: These results indicated that irradiation could be employed as an effective mean to inactivate common food-borne pathogens namely S. aureus and increases the half life of veal.
Innovative Romanian Food Biotechnology, 2013
This study investigated the microbial, chemical and sensorial properties of chicken sausage exposed to gamma irradiation and stored at 0-4 o C. Chicken sausage was treated with 0, 2, 4 or 6 kGy doses of gamma irradiation. Microbial, chemical, and sensory analyses of chicken sausage were evaluated at 0, 4, 8, 12, 16 and 20 weeks of storage. Irradiation at 2, 4 and 6 kGy significantly reduced the counts of total viable (mesophilic aerobic) plate counts (TPCs), fecal coliform and yeast load and prolonged the refrigerated shelf-life of chicken sausage. Irradiation significantly decreased their amount of total acidity, volatile basic nitrogen (VBN), and thiobarbituric acid reactive substances (TBARS), while storage increased the total acidity, VBN and TBARS for irradiated and non-irradiated samples. The percentage of protein slightly increased in irradiated samples with higher doses, while the percentage of fat significantly decreased. Gamma irradiation showed no significant effect on th...
International journal of food science & …, 2007
Cig kofte is a traditional Turkish food containing raw ground meat. Samples inoculated with Escherichia coli O157:H7 were irradiated at 0.5-6 kGy with a 60 Co source and stored at 4 and 25°C. Total aerobic mesophilic count decreased with increasing irradiation doses, D 10 value was 0.83 kGy. Escherichia coli O157:H7 count decreased from 5.1 log 10 CFU g )1 to an undetectable level (<1 log 10 CFU g )1 ) after 1-day storage at 4°C following irradiation at 2 kGy, D 10 -value was 0.29 kGy. Irradiation doses up to 2 kGy did not affect sensory quality after 1 day. There was colour loss in samples irradiated at 2 kGy or above and stored for longer periods. Storage of the irradiated products at abused temperature must be avoided for safety assurance. Irradiation at 2 kGy has a great potential for extending the shelf-life of cig kofte and assuring safety by decreasing the number of E. coli O157:H7 and other bacteria, but further studies with suitable package designs are needed to decrease quality degradation during extended storage.
Open Access Journal of Microbiology & Biotechnology (OAJMB), 2023
There is an increasing demand to guarantee the safety of the food supply due to the public's growing concerns about food safety and foodborne illnesses. It has been demonstrated that gamma irradiation is a potential technique for safely eliminating a variety of common pathogens. The extra advantage of gamma irradiation technology is that it prolongs the shelf life of irradiated food items. The irradiation process has been demonstrated to be reliable; it is widely applied to medical supplies, spices, and other products in numerous nations across the world. Convincing the public that this technology is helpful and even essential for ensuring their safety is the major task at hand. Studies on the market have revealed that while a large number of consumers are eager to buy irradiated food, a large number are not. The aim of the current paper was to highlight the significant effect of gamma irradiation on food quality and safety, in order to correct the wrong believes about gamma irradiation by large number of consumers to comply with the right scientific evidence supported by regulations and control of the Food and Drug Authority (FDA). Well-structured research papers and official documents were reviewed thoroughly to extract official updated information about the characterization and safety with versatile applications of gamma irradiation in food sector.
Food Control, 2005
Raw meat ball (Cig K€ ofte), the traditional Turkish meal, was subjected to gamma irradiation doses of 0, 2, 4 and 7 kGy using Gamma Cell ( 60 Co) irradiation facility to provide safer product. The microbiological quality of irradiated and unirradiated (control) samples were immediately assessed by counting the number of total aerobic mesophilic bacteria, yeast and mold, Staphylococcus spp., coliform, Escherichia coli, and Salmonella spp. Proximate composition of the samples were also investigated. In the control samples, a considerable amount of microbiological loads were determined. The only Salmonella spp, however, could not be detected in both control and irradiated samples. The dose of 2 kGy was sufficient to eliminate the coliform and E. coli, and the dose of 4 kGy was also sufficient for mold-yeast and Staphylococcus spp. elimination. However, the irradiation dose of 7 kGy was found to be necessary to ensure the microbiological safety of the product without changing proximate composition.
Effect of gamma irradiation on shelf life and quality of Broiler meat
SAARC Journal of Agriculture, 2019
The experiment was conducted on fresh broiler meat treated with 60Co gamma irradiation having dose of 0 (T0), 1 (T1), 2 (T2) and 3.5 kGy (T3)) and stored 0, 30 and 60 days at -20ºC to estimate the effect on proximate, sensory, physicochemical, biochemical and microbial changes in broiler meat. Factorial experiment (4x3) in completely randomized design (CRD) replicated three times per cell was applied to study the variation among treatment combination. Color was changed significantly (p<0.05) with higher irradiation doses. DM, EE, CP was increased, and Ash and pH was decreased significantly (p<0.05) with higher irradiation doses. Thiobarbituric acid reactive substances (TBARS), Peroxide value (PV), Free fatty acid (FFA), cooking loss was increased significantly (p<0.05) with irradiation level and storage period. Total viable count (TVC), Total coliform count (TCC), Total yeast and mold count (TYMC) was significantly (p<0.05) reduced with irradiation level. Considering all...