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Patil K, Adhikari M, Rubinelli P, Desiree K, Vierck KR, Acuff JC. Evaluating the Safety of Sous-Vide Cooking for Beef Products Inoculated with Single Strains of Salmonella enterica and Escherichia coli O157. J Food Prot 2024; 87:100252. [PMID: 38484845 DOI: 10.1016/j.jfp.2024.100252] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2023] [Revised: 02/15/2024] [Accepted: 02/20/2024] [Indexed: 04/01/2024]
Abstract
Sous-videcooking is a growing trend among retailers and consumers. Foodborne pathogens may survive the cooking if nonvalidated parameters are used or if pathogens have enhanced thermalresistance. Pathogen inactivation from sous-vide cooking was determined when introduced directly to beef products or via contaminated spices, and with or without a finishing step. Beef products (ground beef, tenderized, and nontenderized steaks) were inoculated with pathogens (Salmonella Montevideo and Escherichia coli O157:NM) in three ways: 1) directly onto the meat 2) ground black pepper incorporated into the recipe 3) ground pepper equilibrated at 30% RH (4 d) prior to incorporation. Beef samples were vacuum-packaged and submerged in a 62.5°C water bath for 120 min. Samples were sampled at 5, 10, 20, and 120 min (recommended from a partner quality study), and a duplicate was grilled to a specific internal temperature (74°C for ground beef, 57°C for steaks) and sampled. Sous-vide cooking reduced pathogen populations by >5 log CFU/g after most treatment times, but less than grilled counterparts (ca. 1-2 log CFU/g difference; p < 0.05).There were no statistically significant differences between inoculation methods, but the tenderization of steaks resulted in significantly lower reductions of pathogens from sous-vide cooking (p < 0.05). Thisresearch challenged sous-vide cooking parameters (120 min, 62.5°C). It showed sous-vide alone lowered pathogens by >4 log CFU/g after most 20-min treatments, but 120-min sous-vide treatments or grilling would be needed for >5-log reductions.Contaminated pepper led to less consistent reductions during the cooking process, yet 2-h sous-vide still achieved a 5-log reduction. Sous-vide cooking instructions must be validated as more products and recipes are marketed.
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Affiliation(s)
- Kavita Patil
- Department of Food Science, University of Arkansas System Division of Agriculture, Fayetteville, AR, USA
| | - Manita Adhikari
- Department of Food Science, University of Arkansas System Division of Agriculture, Fayetteville, AR, USA
| | - Peter Rubinelli
- Department of Food Science, University of Arkansas System Division of Agriculture, Fayetteville, AR, USA
| | - Karina Desiree
- Department of Food Science, University of Arkansas System Division of Agriculture, Fayetteville, AR, USA
| | - Kelly R Vierck
- Department of Animal Science, University of Arkansas System Division of Agriculture, Fayetteville, AR, USA
| | - Jennifer C Acuff
- Department of Food Science, University of Arkansas System Division of Agriculture, Fayetteville, AR, USA.
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Gál R, Čmiková N, Kačániová M, Mokrejš P. Sage Essential Oil as an Antimicrobial Agent against Salmonella enterica during Beef Sous Vide Storage. Foods 2023; 12:4172. [PMID: 38002229 PMCID: PMC10670455 DOI: 10.3390/foods12224172] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2023] [Revised: 11/11/2023] [Accepted: 11/16/2023] [Indexed: 11/26/2023] Open
Abstract
Sous-vide is a process comprising vacuum-sealing food, heating it to the desired temperature, and circulating it in a water bath in a sous vide machine. This cooking technique is increasingly common in homes and catering establishments due to its simplicity and affordability. However, manufacturers and chef's recommendations for low-temperature and long-term sous-vide cooking in media raise food safety concerns, particularly when preparing beef tenderloin. In this study, Salmonella enterica was found to be inactivated by heat and sage essential oil (EO) in beef samples from musculus psoas major that had been sous vide processed. To determine whether heat treatment was likely to increase the sous vide efficiency, S. enterica and sage EO were mixed. After being vacuum-packed and injected with S. enterica, the samples were cooked at 50-65 °C through the sous vide technique for the prescribed time. On days 1, 3, and 6, the amounts of S. enterica, total bacteria, and coliform bacteria were measured in the control and treated groups of beef processed sous vide. Mass spectrometry was used to identify bacterial isolates on different days. On each day that was measured, a higher number of all the microbiota was found in the samples exposed to 50 °C for 5 min. The most frequently isolated microorganisms from both groups of samples were Pseudomonas fragi (17%), Pseudomonas cedrina (8%), and Proteus vulgaris (8%); in the treated group, also S. enterica (21%), Pseudomonas fragi (13%), and Pseudomonas veronii (6%). After the heat treatment of samples at 65 °C for 20 min, the total count of bacteria and coliform bacteria was zero. It has been shown that adding sage essential oil (EO) in combination with sous vide processing technique leads to the stabilization and safety of beef tenderloin.
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Affiliation(s)
- Robert Gál
- Department of Food Technology, Faculty of Technology, Tomas Bata University in Zlín, Vavrečkova 5669, 760 01 Zlín, Czech Republic;
| | - Natália Čmiková
- Institute of Horticulture, Faculty of Horticulture and Landscape Engineering, Slovak University of Agriculture, Tr. A. Hlinku 2, 94976 Nitra, Slovakia;
| | - Miroslava Kačániová
- Institute of Horticulture, Faculty of Horticulture and Landscape Engineering, Slovak University of Agriculture, Tr. A. Hlinku 2, 94976 Nitra, Slovakia;
- School of Medical & Health Sciences, University of Economics and Human Sciences in Warsaw, Okopowa 59, 01 043 Warszawa, Poland
| | - Pavel Mokrejš
- Department of Polymer Engineering, Faculty of Technology, Tomas Bata University in Zlín, Vavrečkova 5669, 760 01 Zlín, Czech Republic;
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Lee YJ, Pan YC, Chang CW, Lu KH. Thermal inactivation kinetics of uropathogenic Escherichia coli in sous-vide processed chicken breast. Food Res Int 2023; 164:112316. [PMID: 36737909 DOI: 10.1016/j.foodres.2022.112316] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2022] [Revised: 12/02/2022] [Accepted: 12/03/2022] [Indexed: 12/13/2022]
Abstract
Chicken is a suspected reservoir of uropathogenic Escherichia coli (UPEC), resulting in foodborne urinary tract infections (UTIs). Sous-vide ready-to-eat (RTE) food products may be associated with microbial hazards due to the low-temperature long-time (LTLT) process. However, little is known regarding the survival of UPEC during sous-vide cooking. The aim of this study was to evaluate the heat resistance of UPEC in chicken breast during sous-vide processing and establish predictive inactivation models. Chicken breast samples were inoculated with a four-strain cocktail of UPEC, including reference strains from UTI patients and chicken isolates. The inoculated samples, with or without 3% NaCl solution for marination, were vacuum sealed in bags, immersed in a temperature-controlled water bath, and cooked at 50 °C, 55 °C, 60 °C, and 63 °C. The change in survival of populations of UPEC was fitted with the linear and Weibull inactivation models to obtain the survival curves at different temperatures; the D- and z-values were also calculated. The goodness-of-fit was evaluated using the root mean square error (RMSE), sum of squared errors (SSE), adjusted R2, and Akaike information criterion (AIC). The results showed that the linear model with tail was better than the Weibull model in terms of fitting performance. With the addition of salt marinade, D-values at 50 °C, 55 °C, 60 °C, and 63 °C determined by the linear model with tail decreased from 299.78 to 166.93 min, 16,60 to 13.87 min, 4.06 to 3.05 min, and 1.05 to 0.87 min, respectively, compared with the controls. The z-values of control and salt-marinated samples were 6.14 °C and 5.89 °C, respectively. The model developed for predicting UPEC survival under sous-vide cooking was validated using an additional survival curve at 58 °C. The validation results showed that the RMSE was 0.122 and 0.133 log CFU/g, and the proportion of relative error was 0.875 and 0.750 in the acceptable prediction zones for the control and salt-marinated samples, respectively. In conclusion, the heat resistance of an emerging foodborne pathogen, UPEC, in sous-vide processed chicken breast was revealed for the first time. Our results showed that salt marinade (3% NaCl) increases the heat sensitivity of UPEC during the sous-vide processing. The developed survival functions based on the linear model with tail can be applied to control the thermal lethality of UPEC.
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Affiliation(s)
- Yun-Jung Lee
- Institute of Food Safety and Health, National Taiwan University, Taipei 100, Taiwan
| | - Yi-Chun Pan
- Institute of Food Science and Technology, National Taiwan University, Taipei 106, Taiwan
| | - Ching-Wen Chang
- Institute of Environmental and Occupational Health Sciences, National Taiwan University, Taipei 100, Taiwan.
| | - Kuan-Hung Lu
- Institute of Food Safety and Health, National Taiwan University, Taipei 100, Taiwan; Institute of Environmental and Occupational Health Sciences, National Taiwan University, Taipei 100, Taiwan.
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Inactivation of Salmonella in nonintact beef during low-temperature sous vide cooking. J Food Prot 2023; 86:100010. [PMID: 36916593 DOI: 10.1016/j.jfp.2022.11.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2022] [Revised: 11/07/2022] [Accepted: 11/09/2022] [Indexed: 12/23/2022]
Abstract
Sous vide cooking is a method of food preparation in which food is vacuum sealed and cooked in a water bath that is set to a precise temperature and circulated by a sous vide device. Due to ease of use and affordability, this cooking method has grown increasingly popular in food service kitchens and domestic settings. However, low-temperature, long holding time sous vide cooking recommendations from manufacturers and chefs in popular press raise food safety concerns - specifically those for the preparation of nonintact beef products. The objective of this experiment was to address these concerns by validating a 5 log reduction of Salmonella spp. in sous vide cooked, nonintact beef steaks. Beef semitendinosus sliced into 2.54 cm steaks were internally inoculated to 7 log with Salmonella Typhimurium, Enteritidis, and Heidelberg via a needle inoculation pin pad. Steaks were individually vacuum sealed, and sous vide cooked at 46.1, 51.6, and 54.4°C. The minimum time measured for a 5 log reduction at 51.6 and 54.4°C was 150 and 64.5 min, respectively (P < 0.01). Additionally, a 7.28 log final reduction was achieved at 51.6°C after 322.5 min (P < 0.01). However, 46.1°C was only able to achieve a final reduction of 2.01 log (P < 0.01) after a holding time of 420 min. The results of this experiment validate in sous vide cooked products the time and temperature combinations provided in the USDA-FSIS Appendix A guidance for a 5 log reduction of Salmonella spp. in meat products. Moreover, more research is needed with other relevant foodborne pathogens to determine if sous vide cooking below Appendix A recommendations could lead to unsafe products.
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Cui Z, Yan H, Manoli T, Mo H, Bi J, Zhang H. Advantages and challenges of sous vide cooking. FOOD SCIENCE AND TECHNOLOGY RESEARCH 2021. [DOI: 10.3136/fstr.27.25] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Affiliation(s)
- ZhenKun Cui
- School of Food Science, Henan Institute of Science and Technology
- Faculty of Food Technologies, Sumy National Agrarian University
| | - Han Yan
- School of Food Science, Henan Institute of Science and Technology
| | - Tatiana Manoli
- Faculty of Food Technologies, Sumy National Agrarian University
- Faculty of Technology and Commodity Science of Food Products and Food Business, Odessa National Academy of Food Technologies
| | - HaiZhen Mo
- School of Food and Bioengineering, Shaanxi University of Science and Technology, Weiyang University Campus
| | - JiCai Bi
- School of Food Science, Henan Institute of Science and Technology
| | - Hao Zhang
- School of Food Science, Henan Institute of Science and Technology
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Espinosa MF, Sancho AN, Mendoza LM, Mota CR, Verbyla ME. Systematic review and meta-analysis of time-temperature pathogen inactivation. Int J Hyg Environ Health 2020; 230:113595. [DOI: 10.1016/j.ijheh.2020.113595] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2020] [Revised: 06/04/2020] [Accepted: 07/06/2020] [Indexed: 11/16/2022]
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Dogruyol H, Mol S, Cosansu S. Increased thermal sensitivity of Listeria monocytogenes in sous-vide salmon by oregano essential oil and citric acid. Food Microbiol 2020; 90:103496. [PMID: 32336368 DOI: 10.1016/j.fm.2020.103496] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2019] [Revised: 01/13/2020] [Accepted: 03/17/2020] [Indexed: 11/19/2022]
Abstract
Inadequate cooking during sous-vide processing may cause foodborne diseases in case the food is contaminated with pathogens such as Listeria monocytogenes. In this study, thermal inactivation of L. monocytogenes in sous-vide processed salmon was investigated. Oregano oil and citric acid were used alone or in combination to determine the probability of increasing the efficiency of heat treatment. Control (C); 0.5% citric acid added (S); 1% oregano essential oil added (O); and citric acid and oregano essential oil combined (OS) groups were prepared. Samples were inoculated with L. monocytogenes, vacuum packed, then sous-vide cooked at 55, 57.5, 60, or 62.5 °C for predetermined times. The D-values of all treated samples were significantly lower than control. The use of oregano oil (O), citric acid (S) and their combination (OS) significantly reduced the time required to inactivate L. monocytogenes. The z-values of L. monocytogenes in C, O, S and OS groups were 5.50, 5.62, 6.54, and 6.92 °C, respectively. It was determined that effective results could be achieved by adding natural antimicrobials to provide safety in sous-vide fish.
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Affiliation(s)
- Hande Dogruyol
- Istanbul University, Faculty of Aquatic Sciences, Department of Seafood Processing Technology, Ordu Cad. No.8, 34134, Istanbul, Turkey.
| | - Suhendan Mol
- Istanbul University, Faculty of Aquatic Sciences, Department of Seafood Processing Technology, Ordu Cad. No.8, 34134, Istanbul, Turkey
| | - Serap Cosansu
- Sakarya University, Faculty of Engineering, Department of Food Engineering, 54187, Esentepe, Sakarya, Turkey
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Dominguez-Hernandez E, Salaseviciene A, Ertbjerg P. Low-temperature long-time cooking of meat: Eating quality and underlying mechanisms. Meat Sci 2018; 143:104-113. [PMID: 29730528 DOI: 10.1016/j.meatsci.2018.04.032] [Citation(s) in RCA: 125] [Impact Index Per Article: 20.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2017] [Revised: 04/25/2018] [Accepted: 04/26/2018] [Indexed: 10/17/2022]
Abstract
Heat treatment of meat at temperatures between 50 and 65 °C, for extended periods of time, is known as low-temperature long-time (LTLT) cooking. This cooking method produces meat that has increased tenderness and better appearance than when cooked at higher temperatures. Public concerns regarding this method have focused on the ability to design heat treatments that can reach microbiological safety. The heat treatment induces modification of the meat structure and its constituents, which can explain the desirable eating quality traits obtained. Denaturation, aggregation, and degradation of myofibrillar, sarcoplasmic and connective tissue proteins occur depending on the combination of time and temperature during the heat treatment. The protein changes, especially in relation to collagen denaturation, along with proteolytic activity, have often been regarded to be the main contributors to the increased meat tenderness. The mechanisms involved and the possible contribution of other factors are reviewed and discussed.
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Affiliation(s)
| | | | - Per Ertbjerg
- Department of Food and Nutrition, University of Helsinki, 00014 Helsinki, Finland.
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9
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Kim SP, Lee SJ, Nam SH, Friedman M. Mechanism of Antibacterial Activities of a Rice Hull Smoke Extract (RHSE) Against Multidrug-Resistant Salmonella Typhimurium In Vitro and in Mice. J Food Sci 2017; 83:440-445. [PMID: 29266224 DOI: 10.1111/1750-3841.14020] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2017] [Revised: 11/13/2017] [Accepted: 11/27/2017] [Indexed: 12/11/2022]
Abstract
The present study tested antibacterial activity of a rice hull smoke extract (RHSE) against a multidrug-resistant strain of Salmonella Typhimurium and examined its mode of suppressive action in vitro and in mice. In vitro studies showed that the minimum inhibitory concentration (MIC) value of RHSE was 1.29% (v/v). The inactivation was confirmed by complete loss of cell viability in the range of 104 to 107 colony forming units of the resistant Salmonella Typhimurium strain. Agarose and sodium dodecyl sulfate-polyacrylamide gel electrophoreses were used to evaluate the integrities of bacterial genomic DNA and total cellular protein profiles. The antibacterial action of RHSE results from a leakage of intracellular macromolecules following rupture of bacterial cells. Scanning electron microscopy of the cells shows that RHSE also induced deleterious morphological changes in the bacterial cell membrane of the pathogens. In vivo antibacterial activity of RHSE at a 1 × MIC concentration was examined in a bacterial gastroenteritis model using Balb/c mice orally infected with the Salmonella Typhimurium. The results show greatly decreased excretion of the bacteria into the feces and suppressed translocation of the bacteria to internal organs (cecum, mesenteric lymph node, spleen, and liver) compared with the infected mice not subjected to the RHSE treatment. Collectively, the present findings indicate that the mechanism of the antibacterial activities both in vitro and in the gastroenteritis environment of the animal model is the result of the direct disruption of cell structure, leading to cell death. RHSE has the potential to serve as a multifunctional food additive that might protect consumers against infections by antibiotic-resistant microorganisms. PRACTICAL APPLICATION The rice hull derived liquid smoke has the potential to complement widely used wood-derived smoke as an antimicrobial flavor and health-promoting formulation for application in foods and feeds.
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Affiliation(s)
- Sung Phil Kim
- STR Biotech Ltd., Chuncheon 24232, Republic of Korea.,Research Inst. of Basic Sciences, Ajou Univ., Suwon 164499, Republic of Korea
| | - Sang Jong Lee
- STR Biotech Ltd., Chuncheon 24232, Republic of Korea
| | - Seok Hyun Nam
- Dept. of Biological Science, Ajou Univ., Suwon 16499, Republic of Korea
| | - Mendel Friedman
- U.S. Dept. of Agriculture, Agricultural Research Service, Western Regional Research Center, Albany, CA 94710, U.S.A
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Noritake SM, Liu J, Kanetake S, Levin CE, Tam C, Cheng LW, Land KM, Friedman M. Phytochemical-rich foods inhibit the growth of pathogenic trichomonads. Altern Ther Health Med 2017; 17:461. [PMID: 28903731 PMCID: PMC5598040 DOI: 10.1186/s12906-017-1967-x] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2017] [Accepted: 09/05/2017] [Indexed: 12/29/2022]
Abstract
Background Plants produce secondary metabolites that often possess widespread bioactivity, and are then known as phytochemicals. We previously determined that several phytochemical-rich food-derived preparations were active against pathogenic foodborne bacteria. Trichomonads produce disease (trichomoniasis) in humans and in certain animals. Trichomonads are increasingly becoming resistant to conventional modes of treatment. It is of interest to test bioactive, natural compounds for efficacy against these pathogens. Methods Using a cell assay, black tea, green tea, grape, pomegranate, and jujube extracts, as well as whole dried jujube were tested against three trichomonads: Trichomonas vaginalis strain G3 (found in humans), Tritrichomonas foetus strain D1 (found in cattle), and Tritrichomonas foetus-like organism strain C1 (found in cats). The most effective of the test substances was subsequently tested against two metronidazole-resistant Trichomonas vaginalis strains, and on normal mucosal flora. Results Black tea extract inhibited all the tested trichomonads, but was most effective against the T. vaginalis organisms. Inhibition by black tea was correlated with the total and individual theaflavin content of the two tea extracts determined by HPLC. Metronidazole-resistant Trichomonas vaginalis strains were also inhibited by the black tea extract. The response of the organisms to the remaining preparations was variable and unique. We observed no effect of the black tea extract on common normal flora bacteria. Conclusions The results suggest that the black tea, and to a lesser degree green tea, grape seed, and pomegranate extracts might present possible natural alternative therapeutic agents to treat Trichomonas vaginalis infections in humans and the related trichomonad infections in animals, without negatively affecting the normal flora.
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Renna M, Gonnella M, de Candia S, Serio F, Baruzzi F. Efficacy of Combined Sous Vide-Microwave Cooking for Foodborne Pathogen Inactivation in Ready-to-Eat Chicory Stems. J Food Sci 2017; 82:1664-1671. [PMID: 28597952 DOI: 10.1111/1750-3841.13719] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2016] [Revised: 03/23/2017] [Accepted: 03/27/2017] [Indexed: 11/29/2022]
Abstract
There is a variety of different food processing methods, which can be used to prepare ready-to-eat foods. However, the need to preserve the freshness and nutritional qualities leads to the application of mild technologies which may be insufficient to inactivate microbial pathogens. In this work, fresh chicory stems were packed under a vacuum in films, which were transparent to microwaves. These were then exposed to microwaves for different periods of time. The application of sous vide microwave cooking (SV-MW, 900 W, 2450 MHz), controlled naturally occurring mesophilic aerobic bacteria, yeasts and molds for up to 30 d when vacuum-packed vegetables were stored at 4 °C. In addition, the process lethality of the SV-MW 90 s cooking was experimentally validated. This treatment led to 6.07 ± 0.7 and 4.92 ± 0.65 log cfu/g reduction of Escherichia coli and Listeria monocytogenes inoculated over the chicory stems (100 g), respectively. With an initial load of 9 log cfu/g for both pathogens, less than 10 cfu/g of surviving cells were found after 90 s cooking. This shows that short-time microwave cooking can be used to effectively pasteurize vacuum-packed chicory stems, achieving >5 log cfu/g reduction of E. coli and L. monocytogenes.
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Affiliation(s)
- Massimiliano Renna
- Inst. of Sciences of Food Production, CNR - National Research Council of Italy, Via G. Amendola, 122/O - 70126, Bari, Italy
- Dept. of Agricultural and Environmental Science, Univ. of Bari Aldo Moro, Via Amendola, 165/A, 70126, Bari, Italy
| | - Maria Gonnella
- Inst. of Sciences of Food Production, CNR - National Research Council of Italy, Via G. Amendola, 122/O - 70126, Bari, Italy
| | - Silvia de Candia
- Inst. of Sciences of Food Production, CNR - National Research Council of Italy, Via G. Amendola, 122/O - 70126, Bari, Italy
| | - Francesco Serio
- Inst. of Sciences of Food Production, CNR - National Research Council of Italy, Via G. Amendola, 122/O - 70126, Bari, Italy
| | - Federico Baruzzi
- Inst. of Sciences of Food Production, CNR - National Research Council of Italy, Via G. Amendola, 122/O - 70126, Bari, Italy
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12
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An assessment of the microbiological quality of lightly cooked food (including sous-vide) at the point of consumption in England. Epidemiol Infect 2017; 145:1500-1509. [PMID: 28236815 DOI: 10.1017/s0950268817000048] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
This observational study aims to investigate the microbiological quality of commercially prepared lightly cooked foods with a major component of food of animal origin and collected as would be served to a consumer. A total of 356 samples were collected from catering (92%), retail (7%) or producers (1%) and all were independent of known incidents of foodborne illness. Using standard methods, all samples were tested for: the presence of Campylobacter spp. and Salmonella spp. and enumerated for levels of, Bacillus spp. including B. cereus, Clostridium perfringens, Listeria spp. including L. monocytogenes, Staphylococcus aureus, Escherichia coli, Enterobacteriacea and aerobic colony count (ACC). Results were interpreted as unsatisfactory, borderline or satisfactory according to the Health Protection Agency guidelines for assessing the microbiological safety of ready-to-eat foods placed on the market. Amongst all samples, 70% were classified as satisfactory, 18% were borderline and 12% were of unsatisfactory microbiological quality. Amongst the unsatisfactory samples, six (2%) were potentially injurious to health due to the presence of: Salmonella spp. (one duck breast); Campylobacter spp. (two duck breast and one chicken liver pâté); L. monocytogenes at 4·3 × 103 cfu (colony-forming units)/g (one duck confit with foie gras ballotin) and C. perfringens at 2·5 × 105 cfu/g (one chicken liver pâté). The remaining unsatisfactory samples were due to high levels of indicator E. coli, Enterobacteriaceae or ACC.
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13
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Juneja VK, Cadavez V, Gonzales-Barron U, Mukhopadhyay S, Friedman M. Effect of pomegranate powder on the heat inactivation of Escherichia coli O104:H4 in ground chicken. Food Control 2016. [DOI: 10.1016/j.foodcont.2016.05.027] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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14
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Surendran Nair M, Lau P, Belskie K, Fancher S, Chen CH, Karumathil DP, Yin HB, Liu Y, Ma F, Upadhyaya I, Upadhyay A, Mancini R, Venkitanarayanan K. Potentiating the Heat Inactivation of Escherichia coli O157:H7 in Ground Beef Patties by Natural Antimicrobials. Front Microbiol 2016; 7:15. [PMID: 26870000 PMCID: PMC4735374 DOI: 10.3389/fmicb.2016.00015] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2015] [Accepted: 01/08/2016] [Indexed: 11/30/2022] Open
Abstract
Escherichia coli O157: H7 (EHEC) is a major foodborne pathogen largely transmitted to humans through the consumption of undercooked ground beef. This study investigated the efficacy of two food-grade, plant-derived antimicrobials, namely rutin (RT), and resveratrol (RV) with or without chitosan (CH) in enhancing EHEC inactivation in undercooked hamburger patties. Further, the effect of aforementioned treatments on beef color and lipid oxidation was analyzed. Additionally, the deleterious effects of these antimicrobial treatments on EHEC was determined using scanning electron microscopy (SEM). Ground beef was inoculated with a five-strain mixture of EHEC (7.0 log CFU/g), followed by the addition of RT (0.05%, 0.1% w/w) or RV (0.1, 0.2% w/w) with or without CH (0.01% w/w). The meat was formed into patties (25 g) and stored at 4°C for 5 days. On days 1, 3, and 5, the patties were cooked (65°C, medium rare) and surviving EHEC was enumerated. The effect of these treatments on meat color and lipid oxidation during storage was also determined as per American Meat Science Association guidelines. The study was repeated three times with duplicate samples of each treatment. Both RT and RV enhanced the thermal destruction of EHEC, and reduced the pathogen load by at least 3 log CFU/g compared to control (P < 0.05). The combination of RT or RV with CH was found to be more effective, and reduced EHEC by 5 log CFU/g (P < 0.05). EHEC counts in uncooked patties did not decline during storage for 5 days (P > 0.05). Moreover, patties treated with RV plus CH were more color stable with higher a∗ values (P < 0.05). SEM results revealed that heat treatment with antimicrobials (CH + RV 0.2%) resulted in complete destruction of EHEC cells and extrusion of intracellular contents. Results suggest that the aforementioned antimicrobials could be used for enhancing the thermal inactivation of EHEC in undercooked patties; however, detailed sensory studies are warranted.
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Affiliation(s)
| | - Patrick Lau
- Department of Animal Science, University of Connecticut, Storrs CT, USA
| | - Kaylin Belskie
- Department of Animal Science, University of Connecticut, Storrs CT, USA
| | - Samantha Fancher
- Department of Animal Science, University of Connecticut, Storrs CT, USA
| | - Chi-Hung Chen
- Department of Animal Science, University of Connecticut, Storrs CT, USA
| | | | - Hsin-Bai Yin
- Department of Animal Science, University of Connecticut, Storrs CT, USA
| | - Yanyan Liu
- Department of Animal Science, University of Connecticut, Storrs CT, USA
| | - Fulin Ma
- Department of Animal Science, University of Connecticut, Storrs CT, USA
| | - Indu Upadhyaya
- Department of Animal Science, University of Connecticut, Storrs CT, USA
| | - Abhinav Upadhyay
- Department of Animal Science, University of Connecticut, Storrs CT, USA
| | - Richard Mancini
- Department of Animal Science, University of Connecticut, Storrs CT, USA
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15
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Joo MJ, Jung H, Kim SH, Yoon WB. The Antibacterial Effect of Flower Pollen on E
scherichia coli
O157:H7 in Ground Pork. J Food Saf 2015. [DOI: 10.1111/jfs.12182] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Myoung-Jae Joo
- Department of Food Science and Biotechnology; College of Agricultural and Life Science; Kangwon National University; KangwondaehakGil 1 Chuncheon Gangwon-do 200-701 South Korea
| | - HwaBin Jung
- Department of Food Science and Biotechnology; College of Agricultural and Life Science; Kangwon National University; KangwondaehakGil 1 Chuncheon Gangwon-do 200-701 South Korea
| | - Sun-ho Kim
- Department of Food Science and Biotechnology; College of Agricultural and Life Science; Kangwon National University; KangwondaehakGil 1 Chuncheon Gangwon-do 200-701 South Korea
| | - Won Byong Yoon
- Department of Food Science and Biotechnology; College of Agricultural and Life Science; Kangwon National University; KangwondaehakGil 1 Chuncheon Gangwon-do 200-701 South Korea
- Agricultural and Life Science Research Institute; Kangwon National University; KangwondaehakGil 1 Chuncheon Gangwon-do 200-701 South Korea
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16
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Juneja VK, Garcia-Dávila J, Lopez-Romero JC, Pena-Ramos EA, Camou JP, Valenzuela-Melendres M. Modeling the effects of temperature, sodium chloride, and green tea and their interactions on the thermal inactivation of Listeria monocytogenes in turkey. J Food Prot 2014; 77:1696-702. [PMID: 25285486 DOI: 10.4315/0362-028x.jfp-14-124] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
The interactive effects of heating temperature (55 to 65°C), sodium chloride (NaCl; 0 to 2%), and green tea 60% polyphenol extract (GTPE; 0 to 3%) on the heat resistance of a five-strain mixture of Listeria monocytogenes in ground turkey were determined. Thermal death times were quantified in bags that were submerged in a circulating water bath set at 55, 57, 60, 63, and 65°C. The recovery medium was tryptic soy agar supplemented with 0.6% yeast extract and 1% sodium pyruvate. D-values were analyzed by second-order response surface regression for temperature, NaCl, and GTPE. The data indicated that all three factors interacted to affect the inactivation of the pathogen. The D-values for turkey with no NaCl or GTPE at 55, 57, 60, 63, and 65°C were 36.3, 20.8, 13.2, 4.1, and 2.9 min, respectively. Although NaCl exhibited a concentration-dependent protective effect against heat lethality on L. monocytogenes in turkey, addition of GTPE rendered the pathogen more sensitive to the lethal effect of heat. GTPE levels up to 1.5% interacted with NaCl and reduced the protective effect of NaCl on heat resistance of the pathogen. Food processors can use the predictive model to design an appropriate heat treatment that would inactivate L. monocytogenes in cooked turkey products without adversely affecting the quality of the product.
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Affiliation(s)
- Vijay K Juneja
- U.S. Department of Agriculture, Agricultural Research Service, Eastern Regional Research Center, 600 East Mermaid Lane, Wyndmoor, Pennsylvania 19308, USA.
| | - Jimena Garcia-Dávila
- Research Center for Food and Development, CIAD, A.C., Hermosillo, Sonora, 83000, Mexico
| | | | - Etna Aida Pena-Ramos
- Research Center for Food and Development, CIAD, A.C., Hermosillo, Sonora, 83000, Mexico
| | - Juan Pedro Camou
- Research Center for Food and Development, CIAD, A.C., Hermosillo, Sonora, 83000, Mexico
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17
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Friedman M. Anticarcinogenic, cardioprotective, and other health benefits of tomato compounds lycopene, α-tomatine, and tomatidine in pure form and in fresh and processed tomatoes. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2013; 61:9534-50. [PMID: 24079774 DOI: 10.1021/jf402654e] [Citation(s) in RCA: 150] [Impact Index Per Article: 13.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/02/2023]
Abstract
Tomatoes produce the bioactive compounds lycopene and α-tomatine that are reported to have potential health-promoting effects in animals and humans, but our understanding of the roles of these compounds in the diet is incomplete. Our current knowledge gained from the chemistry and analysis of these compounds in fresh and processed tomatoes and from studies on their bioavailability, bioactivity, and mechanisms of action against cancer cells and other beneficial bioactivities including antibiotic, anti-inflammatory, antioxidative, cardiovascular, and immunostimulating effects in cells, animals, and humans is discussed and interpreted here. Areas for future research are also suggested. The collated information and suggested research might contribute to a better understanding of the agronomical, biochemical, chemical, physiological, molecular, and cellular bases of the health-promoting effects and facilitate and guide further studies needed to optimize the use of lycopene and α-tomatine in pure form and in fresh tomatoes and processed tomato products to help prevent or treat human disease.
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Affiliation(s)
- Mendel Friedman
- Western Regional Research Center, Agricultural Research Service, U.S. Department of Agriculture , Albany, California 94710, United States
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18
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Concentration-dependent inhibition of Escherichia coli O157:H7 and heterocyclic amines in heated ground beef patties by apple and olive extracts, onion powder and clove bud oil. Meat Sci 2013; 94:461-7. [DOI: 10.1016/j.meatsci.2013.03.010] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2012] [Revised: 02/08/2013] [Accepted: 03/10/2013] [Indexed: 02/02/2023]
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19
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Vasan A, Leong WM, Ingham SC, Ingham BH. Thermal tolerance characteristics of non-O157 Shiga toxigenic strains of Escherichia coli (STEC) in a beef broth model system are similar to those of O157:H7 STEC. J Food Prot 2013; 76:1120-8. [PMID: 23834785 DOI: 10.4315/0362-028x.jfp-12-500] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
The non-O157 Shiga toxigenic Escherichia coli (STEC) serogroups most commonly associated with illness are O26, O45, O103, O111, O121, and O145. In the United States, these serogroups are considered adulterants in raw nonintact beef. To begin to understand the behavior of these pathogens in meat systems, we compared the thermal tolerance of acid-adapted cells of non-O157 STEC and O157:H7 STEC in a beef-derived broth. D58°C-values were determined for at least three strains per serogroup, and D54.6°C-values and D63.6°C-values were determined for one strain per serogroup. Each strain was grown to stationary phase in brain heart infusion broth (BHIB; pH 7.0) and inoculated into prewarmed BHIB in a shaking water bath for thermotolerance experiments at 54.6, 58.0, or 63.6°C (three trials per strain). Samples were heated for up to 160 min at 54.6°C, 3 min at 58.0°C, or 45 s at 63.6°C, with periodic sampling followed by rapid cooling and plating on modified Levine's eosin methylene blue agar. For each strain and temperature, the log CFU per milliliter was plotted versus time, and D-values were determined. Across all strains, the least and most heat tolerant STEC serogroups at 58°C were O145 and O157, respectively. D58°C-values in BHIB ranged from 0.44 min for an O145 strain to 1.42 min for an O157:H7 strain. D58°C-values for O157 STEC strains were significantly higher than those for at least one strain in each of the non-O157 STEC serogroups (P < 0.05) except for serogroup O103. At 54.6°C, the most heat-resistant STEC strain belonged to serogroup O103 and was significantly more heat tolerant than the O157:H7 strains (P < 0.05). Grouping the strains, there were no significant differences in heat tolerance between O157 and non-O157 STEC at 63.6°C (P ≥ 0.05). The z-values for non-O157 STEC strains were comparable to those for O157:H7 STEC strains (P ≥ 0.05), ranging from 4.10 to 5.21°C. These results suggest that thermal processing interventions that target destruction of E. coli O157:H7 may have adequate lethality against non-O157 STEC.
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Affiliation(s)
- Akhila Vasan
- Department of Food Science, University of Wisconsin-Madison, 1605 Linden Drive, Madison, Wisconsin 53706, USA
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20
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Chen CH, Ravishankar S, Marchello J, Friedman M. Antimicrobial activity of plant compounds against Salmonella Typhimurium DT104 in ground pork and the influence of heat and storage on the antimicrobial activity. J Food Prot 2013; 76:1264-9. [PMID: 23834804 DOI: 10.4315/0362-028x.jfp-12-493] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Salmonella enterica is a predominant foodborne pathogen that causes diarrheal illness worldwide. A potential method of inhibiting pathogenic bacterial growth in meat is through the introduction of plant-derived antimicrobials. The objectives of this study were to investigate the influence of heat (70°C for 5 min) and subsequent cold storage (4°C up to 7 days) on the effectiveness of oregano and cinnamon essential oils and powdered olive and apple extracts against Salmonella enterica serovar Typhimurium DT104 in ground pork and to evaluate the activity of the most effective antimicrobials (cinnamon oil and olive extract) at higher concentrations in heated ground pork. The surviving Salmonella populations in two groups (heated and unheated) of antimicrobial-treated pork were compared. Higher concentrations of the most effective compounds were then tested (cinnamon oil at 0.5 to 1.0% and olive extract at 3, 4, and 5%) against Salmonella Typhimurium in heated ground pork. Samples were stored at 4°C and taken on days 0, 3, 5, and 7 for enumeration of survivors. The heating process did not affect the activity of antimicrobials. Significant 1.3- and 3-log reductions were observed with 1.0% cinnamon oil and 5% olive extract, respectively, on day 7. The minimum concentration required to achieve . 1-log reduction in Salmonella population was 0.8% cinnamon oil or 4% olive extract. The results demonstrate the effectiveness of these antimicrobials against multidrug-resistant Salmonella Typhimurium in ground pork and their stability during heating and cold storage. The most active formulations have the potential to enhance the microbial safety of ground pork.
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Affiliation(s)
- Cynthia H Chen
- Department of Animal Science, University of Arizona, Shantz 205, PO Box 210038, Tucson, Arizona 85721, USA
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21
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Chmielewski RA, Beck JR, Swayne DE. Evaluation of the U.S. Department of Agriculture's egg pasteurization processes on the inactivation of high-pathogenicity avian influenza virus and velogenic Newcastle disease virus in processed egg products. J Food Prot 2013; 76:640-5. [PMID: 23575126 DOI: 10.4315/0362-028x.jfp-12-369] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Globally, 230,662 metric tons of liquid egg products are marketed each year. The presence of highly pathogenic avian influenza (HPAI) or Newcastle disease in an exporting country can legitimately inhibit trade in eggs and processed egg products; development and validation of pasteurization parameters are essential for safe trade to continue. The HPAI virus (HPAIV) A/chicken/Pennsylvania/1370/1983 (H5N2) and velogenic Newcastle disease virus (vNDV) AMPV-1/chicken/California/S01212676/2002 were inoculated into five egg products and heat treated at various times and temperatures to determine thermal inactivation rates to effect a 5-log viral reduction. For HPAIV and vNDV, the pasteurization processes for fortified, sugared, plain, and salted egg yolk, and homogenized whole egg (HPAIV only) products resulted in >5-log reductions in virus at the lower temperature-longer times of U.S. Department of Agriculture (USDA)-approved Salmonella pasteurization processes. In addition, a >5-log reduction of HPAIV was also demonstrated for the five products at the higher temperatures-shorter times of USDA-approved pasteurization processes, whereas the vNDV virus was adequately inactivated in only fortified and plain egg yolk products. For the salted and sugared egg yolk products, an additional 0.65 and 1.6 min of treatment, respectively, at 63.3 °C was necessary to inactivate 5 log of vNDV. Egg substitute with fat does not have standard USDA pasteurization criteria, but the D59-value was 0.75 min, adequate to inactivate 5 log of vNDV in <4 min.
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Affiliation(s)
- Revis A Chmielewski
- Exotic and Emerging Avian Viral Diseases Research Unit, Southeast Poultry Research Laboratory, Agricultural Research Service, U.S. Department of Agriculture, 934 College Station Road, Athens, Georgia 30605, USA
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22
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Ilhak Oİ, Dikici A, Can OP, Seker P, Oksüztepe G, Calıcıoğlu M. Effect of cooking procedures of kiymali pide, a traditional Turkish fast-food, on destruction of Escherichia coli O157:H7. Meat Sci 2013; 94:159-63. [PMID: 23501245 DOI: 10.1016/j.meatsci.2013.02.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2012] [Revised: 02/01/2013] [Accepted: 02/04/2013] [Indexed: 10/27/2022]
Abstract
The objective of the present study was to obtain data about cooking time and temperature of kiymali pide in the restaurants and to investigate thermal inactivation of E. coli O157:H7 during experimental kiymali pide making. A field study was conducted in randomly selected 23 of 87 pide restaurants. Processing parameters including oven temperature, cooking period and post-cooking temperature were determined. Kiymali pide samples were prepared using ground beef filling experimentally inoculated with E. coli O157:H7 (7.6 log10 CFU/g). Pide samples were cooked at a conventional oven at 180 °C for 180, 240, 270, 300 and 330 s. Results of the current study suggest that cooking kiymali pide at 180 °C for at least 330 s (5.5 min) may provide sufficient food safety assurance (≥6 log10 CFU/g) for E. coli O157:H7.
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Affiliation(s)
- Osman İrfan Ilhak
- Department of Food Hygiene and Technology, Faculty of Veterinary Medicine, Firat University, 23119 Elazig, Turkey.
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23
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Friedman M, Henika PR, Levin CE. Bactericidal activities of health-promoting, food-derived powders against the foodborne pathogens Escherichia coli, Listeria monocytogenes, Salmonella enterica, and Staphylococcus aureus. J Food Sci 2013; 78:M270-5. [PMID: 23317422 DOI: 10.1111/1750-3841.12021] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2012] [Accepted: 11/19/2012] [Indexed: 11/28/2022]
Abstract
UNLABELLED We evaluated the relative bactericidal activities (BA(50) ) of 10 presumed health-promoting food-based powders (nutraceuticals) and, for comparison, selected known components against the following foodborne pathogens: Escherichia coli O157:H7, Salmonella enterica, Listeria monocytogenes, and Staphylococcus aureus. The relative activities were evaluated using quantitative bactericidal activity [(BA(50) value, defined as the percentage of the sample in the assay mixture that resulted in a 50% decrease in colony forming units]. The BA(50) values were determined by fitting the data to a sigmoidal curve by regression analysis using concentration-antimicrobial response data. Antimicrobial activity is indicated by a low BA(50) value; meaning less material is needed to kill 50% of the bacteria. Olive pomace, olive juice powder, and oregano leaves were active against all 4 pathogens, suggesting that they behave as broad-spectrum antimicrobials. All powders exhibited strong antimicrobial activity against S. aureus. The following powders showed exceptionally high activity against S. aureus (as indicated by the low BA(50) values shown in parentheses): apple skin extract (0.002%); olive pomace (0.008%); and grape seed extract (0.016%). Listeria bacteria were also highly susceptible to apple skin extract (0.007%). The most active substances provide candidates for the evaluation of antimicrobial effectiveness in human food and animal feed. PRACTICAL APPLICATION Plant-derived health-promoting food supplements, high in bioactive compounds, are candidates for use as antimicrobials in food.
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Affiliation(s)
- Mendel Friedman
- Western Regional Research Center, Agricultural Research Service-USDA, Produce Safety and Microbiology Research Unit, Albany, CA 94710, USA.
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24
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Rounds L, Havens CM, Feinstein Y, Friedman M, Ravishankar S. Plant extracts, spices, and essential oils inactivate Escherichia coli O157:H7 and reduce formation of potentially carcinogenic heterocyclic amines in cooked beef patties. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2012; 60:3792-3799. [PMID: 22397498 DOI: 10.1021/jf204062p] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Meats need to be heated to inactivate foodborne pathogens such as Escherichia coli O157:H7. High-temperature treatment used to prepare well-done meats increases the formation of carcinogenic heterocyclic amines (HCAs). We evaluated the ability of plant extracts, spices, and essential oils to simultaneously inactivate E. coli O157:H7 and suppress HCA formation in heated hamburger patties. Ground beef with added antimicrobials was inoculated with E. coli O157:H7 (10(7) CFU/g). Patties were cooked to reach 45 °C at the geometric center, flipped, and cooked for 5 min. Samples were then taken for microbiological and mass spectrometry analysis of HCAs. Some compounds were inhibitory only against E. coli or HCA formation, while some others inhibited both. Addition of 5% olive or apple skin extracts reduced E. coli O157:H7 populations to below the detection limit and by 1.6 log CFU/g, respectively. Similarly, 1% lemongrass oil reduced E. coli O157:H7 to below detection limits, while clove bud oil reduced the pathogen by 1.6 log CFU/g. The major heterocyclic amines 2-amino-3,8-dimethylimidazo[4,5-f]quinoxaline (MeIQx) and 2-amino-1-methyl-6-phenylimidazo[4,5-b]pyridine (PhIP) were concurrently reduced with the addition of olive extract by 79.5% and 84.3% and with apple extract by 76.1% and 82.1%, respectively. Similar results were observed with clove bud oil: MeIQx and PhIP were reduced by 35% and 52.1%, respectively. Addition of onion powder decreased formation of PhIP by 94.3%. These results suggest that edible natural plant compounds have the potential to prevent foodborne infections as well as carcinogenesis in humans consuming heat-processed meat products.
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Affiliation(s)
- Liliana Rounds
- Department of Veterinary Science and Microbiology, University of Arizona, Tucson, Arizona 85721, United States
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25
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Burris KP, Davidson PM, Stewart CN, Zivanovic S, Harte FM. Aqueous extracts of yerba mate (Ilex paraguariensis) as a natural antimicrobial against Escherichia coli O157:H7 in a microbiological medium and pH 6.0 apple juice. J Food Prot 2012; 75:753-7. [PMID: 22488066 DOI: 10.4315/0362-028x.jfp-11-214] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Ilex paraguariensis is popularly used in the preparation of a tea infusion (yerba mate), most commonly produced and consumed in the South American countries of Uruguay, Paraguay, Argentina, and Brazil. In this study, aqueous extracts of commercial tea, derived from the holly plant species I. paraguariensis were evaluated for their ability to inhibit or inactivate Escherichia coli O157:H7 in a microbiological medium and modified apple juice. Dialyzed, lyophilized aqueous extracts were screened for antimicrobial activity against E. coli O157:H7 strains ATCC 43894 and 'Cider' in tryptic soy broth (TSB) and apple juice (adjusted to pH 6.0 to allow for growth of the bacterium). A mixture of the two strains was used as the inoculum when apple juice was used as the medium. MBCs were determined to be ca. 5 and 10 mg/ml for ATCC 43894 and 'Cider', respectively, in TSB. Higher concentrations of the extract were required to inactivate E. coli O157:H7 in pH-adjusted apple juice. An approximate 4.5-log reduction was observed for E. coli O157:H7 treated with 40 mg/ml extract. It was concluded that aqueous extracts from commercial yerba mate have potential to be used as antimicrobials in foods and beverages against pathogenic E. coli O157:H7.
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Affiliation(s)
- Kellie P Burris
- Department of Food Science and Technology, University of Tennessee-Knoxville, Knoxville, TN 37996-4591, USA
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26
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Juneja VK, Yadav AS, Hwang CA, Sheen S, Mukhopadhyay S, Friedman M. Kinetics of thermal destruction of Salmonella in ground chicken containing trans-cinnamaldehyde and carvacrol. J Food Prot 2012; 75:289-96. [PMID: 22289589 DOI: 10.4315/0362-028x.jfp-11-307] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
We investigated the heat resistance of an eight-strain cocktail of Salmonella serovars in chicken supplemented with trans cinnamaldehyde (0 to 1.0%, wt/wt) and carvacrol (0 to 1.0%, wt/wt). Inoculated meat was packaged in bags that were completely immersed in a circulating water bath and held at 55 to 71°C for predetermined lengths of time. The recovery medium was tryptic soy agar supplemented with 0.6% yeast extract and 1% sodium pyruvate. D-values in chicken, determined by linear regression, were 17.45, 2.89, 0.75, and 0.29 min at 55, 60, 65, and 71°C, respectively (z = 9.02°C). Using a survival model for nonlinear survival curves, D-values in chicken ranged from 13.52 min (D(1), major population) and 51.99 min (D(2), heat-resistant subpopulation) at 55°C to 0.15 min (D(1)) and 1.49 min (D(2)) at 71°C. When the Salmonella cocktail was in chicken supplemented with 0.1 to 1.0% trans-cinnamaldehyde or carvacrol, D-values calculated by both approaches were consistently less at all temperatures. This observation suggests that the addition of natural antimicrobials to chicken renders Salmonella serovars more sensitive to the lethal effect of heat. Thermal death times from this study will be beneficial to the food industry in designing hazard analysis and critical control point plans to effectively eliminate Salmonella contamination in chicken products used in this study.
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Affiliation(s)
- Vijay K Juneja
- Eastern Regional Research Center, U.S. Department of Agriculture, Agricultural Research Service, Wyndmoor, PA 19038, USA.
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27
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Friedman M, Rasooly R. Response Dr. Archer's Comments. J Food Sci 2012. [DOI: 10.1111/j.1750-3841.2011.02568_4.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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28
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Moore KL, Patel J, Jaroni D, Friedman M, Ravishankar S. Antimicrobial activity of apple, hibiscus, olive, and hydrogen peroxide formulations against Salmonella enterica on organic leafy greens. J Food Prot 2011; 74:1676-83. [PMID: 22004815 DOI: 10.4315/0362-028x.jfp-11-174] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Salmonella enterica is one of the most common bacterial pathogens implicated in foodborne outbreaks involving fresh produce in the last decade. In an effort to discover natural antimicrobials for use on fresh produce, the objective of the present study was to evaluate the effectiveness of different antimicrobial plant extract-concentrate formulations on four types of organic leafy greens inoculated with S. enterica serovar Newport. The leafy greens tested included organic romaine and iceberg lettuce, and organic adult and baby spinach. Each leaf sample was washed, dip inoculated with Salmonella Newport (10(6) CFU/ml), and dried. Apple and olive extract formulations were prepared at 1, 3, and 5% concentrations, and hibiscus concentrates were prepared at 10, 20, and 30%. Inoculated leaves were immersed in the treatment solution for 2 min and individually incubated at 4°C. After incubation, samples were taken on days 0, 1, and 3 for enumeration of survivors. Our results showed that the antimicrobial activity was both concentration and time dependent. Olive extract exhibited the greatest antimicrobial activity, resulting in 2- to 3-log CFU/g reductions for each concentration and type of leafy green by day 3. Apple extract showed 1- to 2-log CFU/g reductions by day 3 on various leafy greens. Hibiscus concentrate showed an overall reduction of 1 log CFU/g for all leafy greens. The maximum reduction by hydrogen peroxide (3%) was about 1 log CFU/g. The antimicrobial activity was also tested on the background microflora of organic leafy greens, and reductions ranged from 0 to 2.8 log. This study demonstrates the potential of natural plant extract formulations to inactivate Salmonella Newport on organic leafy greens.
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Affiliation(s)
- Katherine L Moore
- Department of Veterinary Science and Microbiology, University of Arizona 1117, East Lowell Street, Tucson, Arizona 85721, USA
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29
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Sirk TW, Friedman M, Brown EF. Molecular binding of black tea theaflavins to biological membranes: relationship to bioactivities. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2011; 59:3780-3787. [PMID: 21417313 DOI: 10.1021/jf2006547] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Molecular dynamics simulations were used to study the interactions of three theaflavin compounds with lipid bilayers. Experimental studies have linked theaflavins to beneficial health effects, some of which are related to interactions with the cell membrane. The molecular interaction of theaflavins with membranes was explored by simulating the interactions of three theaflavin molecules (theaflavin, theaflavin-3-gallate, and theaflavin-3,3'-digallate) with a mixed bilayer composed of 1-palmitoyl-2-oleoyl phosphatidylcholine (POPC) and 1-palmitoyl-2-oleoyl phosphatidylethanolamine (POPE). The simulations show that the theaflavins evaluated have an affinity for the lipid bilayer surface via hydrogen bonding. The molecular structure of theaflavins influenced their configuration when binding to the bilayer surface, as well as their ability to form hydrogen bonds with the lipid headgroups. The theaflavin-bilayer interactions studied here help to define structure-function relationships of the theaflavins and provide a better understanding of the role of theaflavins in biological processes. The significance of the results are discussed in the context of black tea composition and bioactivity.
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Affiliation(s)
- Timothy W Sirk
- Macromolecular Science & Technology Branch, US Army Research Laboratory, Aberdeen, Maryland 21005-5069, United States.
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30
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Du WX, Olsen C, Avena-Bustillos R, Friedman M, McHugh T. Physical and Antibacterial Properties of Edible Films Formulated with Apple Skin Polyphenols. J Food Sci 2011; 76:M149-55. [DOI: 10.1111/j.1750-3841.2010.02012.x] [Citation(s) in RCA: 84] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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31
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Rasooly R, Do PM, Levin CE, Friedman M. Inhibition of Shiga Toxin 2 (Stx2) in Apple Juices and its Resistance to Pasteurization. J Food Sci 2010; 75:M296-301. [DOI: 10.1111/j.1750-3841.2010.01615.x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
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Rasooly R, Do PM, Friedman M. Inhibition of biological activity of staphylococcal enterotoxin A (SEA) by apple juice and apple polyphenols. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2010; 58:5421-5426. [PMID: 20402509 DOI: 10.1021/jf904021b] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
The foodborne pathogen Staphylococcus aureus produces the virulent staphylococcal enterotoxin A (SEA), a single-chain protein that consists of 233 amino acid residues with a molecular weight of 27 078 Da. SEA is a superantigen that is reported to contribute to animal (mastitis) and human (emesis, diarrhea, atopic dermatitis, arthritis, and toxic shock) syndromes. Changes of the native structural integrity may inactivate the toxin by preventing molecular interaction with cell membrane receptor sites of their host cells. In the present study, we evaluated the ability of one commercial and two freshly prepared apple juices and a commercial apple polyphenol preparation (Apple Poly) to inhibit the biological activity of SEA. Dilutions of freshly prepared apple juices and Apple Poly inhibited the biological activity of SEA without any significant cytotoxic effect on the spleen cells. Additional studies with antibody-coated immunomagnetic beads bearing specific antibodies against the toxin revealed that SEA added to apple juice appears to be largely irreversibly bound to the juice constituents. The results suggest that food-compatible and safe anti-toxin phenolic compounds can be used to inactivate SEA in vitro and possibly also in vivo, even after induction of T-cell proliferation by long-term exposure to SEA. The significance of the results for microbial food safety and human health is discussed.
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Affiliation(s)
- Reuven Rasooly
- Western Regional Research Center, Agricultural Research Service, United States Department of Agriculture, Albany, California 94710, USA.
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Juneja VK, Hwang CA, Friedman M. Thermal Inactivation and Postthermal Treatment Growth during Storage of MultipleâSalmonellaâSerotypes in Ground Beef as Affected by Sodium Lactate and Oregano Oil. J Food Sci 2010; 75:M1-6. [DOI: 10.1111/j.1750-3841.2009.01395.x] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
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Sirk TW, Brown EF, Friedman M, Sum AK. Molecular binding of catechins to biomembranes: relationship to biological activity. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2009; 57:6720-6728. [PMID: 19572638 DOI: 10.1021/jf900951w] [Citation(s) in RCA: 104] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Molecular dynamics simulations were used to study the interactions of four green tea catechin compounds with lipid bilayers. Reported studies have shown that catechins are linked to beneficial health effects, specifically those related to interactions with the cell membrane. To better understand the molecular interaction of catechins with membranes, simulations were carried out of interactions of four catechin molecules [epicatechin (EC), epigallocatechin (EGC), epicatechin gallate (ECG), and epigallocatechin gallate (EGCG)] with a 1-palmitoyl-2-oleoylphosphatidylcholine (POPC) lipid bilayer. The simulations show that catechins possess a strong affinity for the lipid bilayer. Some are absorbed into the bilayer. The molecular structure and aggregated condition of the catechins significantly influences their absorption, as well as their ability to form hydrogen bonds with the lipid headgroups. Insight into these molecular interactions helps to distinguish the structure-function relationship of the catechins with lipid bilayers and provides a foundation for a better understanding of the role of catechins in biological processes.
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Affiliation(s)
- Timothy W Sirk
- Department of Mechanical Engineering, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061, USA
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Friedman M, Levin CE, Choi SH, Lee SU, Kozukue N. Changes in the Composition of Raw Tea Leaves from the Korean Yabukida Plant during High-Temperature Processing to Pan-Fried Kamairi-Cha Green Tea. J Food Sci 2009; 74:C406-12. [DOI: 10.1111/j.1750-3841.2009.01185.x] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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