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Olaimat AN, Al-Holy MA, Osaili TM, Abughoush MH, Al-Nabulsi AA, Alawneh M, Deseh L, Abazeed B, Shqair R, Mutlaq S, Ayyash M, Holley RA. Antimicrobial activity of eugenol and carvacrol against Salmonella enterica and E. coli O157:H7 in falafel paste at different storage temperatures. Int J Food Microbiol 2024; 415:110648. [PMID: 38422677 DOI: 10.1016/j.ijfoodmicro.2024.110648] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2023] [Revised: 02/07/2024] [Accepted: 02/26/2024] [Indexed: 03/02/2024]
Abstract
The objectives of the current study were: i) to investigate the antimicrobial activity of 0.125, 0.250 and 0.50 % (7.54, 15.08 and 30.17 mmol/Kg of eugenol) and (8.15, 16.31, and 33.61 mmol/Kg of carvacrol) against S. enterica and E. coli O157:H7 in falafel paste (FP) stored at 4, 10 or 25 °C for 10 d; and ii) to study the sensory properties of fried falafel treated with eugenol and carvacrol. S. enterica grew well in untreated falafel (control) samples at 10 and 25 °C, while E. coli O157:H7 grew only at 25 °C. However, numbers of S. enterica and E. coli O157:H7 in FP stored at 4 °C were reduced by 1.4-1.6 log CFU/g after 10 d. The antimicrobial agents were more effective at 25 °C against S. enterica, but were better at 4 and 10 °C against E. coli O157:H7. Addition of 0.125-0.5 % eugenol or carvacrol reduced the S. enterica numbers to undetectable level by direct plating (2 log CFU/g) by 2-10 d at 25 °C. FP samples treated with 0.5 % eugenol or 0.25-0.5 % carvacrol were negative for S. enterica cells by enrichment (1 CFU/5 g) by 10 d at 25 °C. In contrast, viable E. coli O157:H7 were not detected by direct plating when FP was treated with 0.25-0.5 % carvacrol or 0.5 % eugenol and stored at 4 °C by 2 d. Addition of eugenol or carvacrol did not affect the color, texture, and appearance of fried falafel but decreased the flavor and overall acceptability scores compared to untreated falafel. Using eugenol and carvacrol as natural antimicrobials have the potential to enhance the safety of FP by reducing the threat from foodborne pathogens.
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Affiliation(s)
- Amin N Olaimat
- Department of Clinical Nutrition and Dietetics, Faculty of Applied Medical Sciences, The Hashemite University, P.O. Box 330127, Zarqa 13133, Jordan.
| | - Murad A Al-Holy
- Department of Clinical Nutrition and Dietetics, Faculty of Applied Medical Sciences, The Hashemite University, P.O. Box 330127, Zarqa 13133, Jordan
| | - Tareq M Osaili
- Department of Clinical Nutrition and Dietetics, College of Health Sciences, University of Sharjah, Sharjah, United Arab Emirates; Department of Nutrition and Food Technology, Faculty of Agriculture, Jordan University of Science and Technology, Irbid, Jordan
| | - Mahmoud H Abughoush
- Department of Clinical Nutrition and Dietetics, Faculty of Applied Medical Sciences, The Hashemite University, P.O. Box 330127, Zarqa 13133, Jordan; Science of Nutrition and Dietetics Program, College of Pharmacy, Al Ain University, P.O. Box 64141, Abu Dhabi, United Arab Emirates
| | - Anas A Al-Nabulsi
- Department of Nutrition and Food Technology, Faculty of Agriculture, Jordan University of Science and Technology, Irbid, Jordan
| | - Maysa Alawneh
- Department of Clinical Nutrition and Dietetics, Faculty of Applied Medical Sciences, The Hashemite University, P.O. Box 330127, Zarqa 13133, Jordan
| | - Lamees Deseh
- Department of Clinical Nutrition and Dietetics, Faculty of Applied Medical Sciences, The Hashemite University, P.O. Box 330127, Zarqa 13133, Jordan
| | - Bushra Abazeed
- Department of Clinical Nutrition and Dietetics, Faculty of Applied Medical Sciences, The Hashemite University, P.O. Box 330127, Zarqa 13133, Jordan
| | - Raghdah Shqair
- Department of Clinical Nutrition and Dietetics, Faculty of Applied Medical Sciences, The Hashemite University, P.O. Box 330127, Zarqa 13133, Jordan
| | - Sawsan Mutlaq
- Department of Nutrition and Food Technology, Faculty of Agriculture, Jordan University of Science and Technology, Irbid, Jordan
| | - Mutamed Ayyash
- Department of Food Science, College of Agriculture and Veterinary Medicine, United Arab Emirates University, P.O. Box 15551, Al Ain 53000, United Arab Emirates
| | - Richard A Holley
- Department of Food and Human Nutritional Sciences, University of Manitoba, Winnipeg, Canada
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Olaimat AN, Al-Holy MA, Abughoush MH, Daseh L, Al-Nabulsi AA, Osaili TM, Al-Rousan W, Maghaydah S, Ayyash M, Holley RA. Survival of Salmonella enterica and Listeria monocytogenes in date palm paste and syrup at different storage temperatures. J Food Sci 2023. [PMID: 37243359 DOI: 10.1111/1750-3841.16620] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2023] [Revised: 04/25/2023] [Accepted: 05/09/2023] [Indexed: 05/28/2023]
Abstract
This study aimed to investigate the behavior of Salmonella enterica and Listeria monocytogenes in processed date paste and syrup at different temperatures. Commercial products were inoculated with approximately 6 log CFU/mL of S. enterica or L. monocytogenes and stored at 4, 10, and 24°C for 90 days. S. enterica was able to survive in date products until the end of storage at 4°C. At this temperature, numbers decreased by 2.1 log CFU/g in date paste and by 3.4 log CFU/g in date syrup; however, at 10°C, cells were reduced >4.2 log CFU/g and were undetectable by direct plating in date paste or by enrichment (complete elimination) in syrup. Further, at 24°C, complete elimination of S. enterica was achieved in date paste and syrup by 30 and 7 days, respectively. L. monocytogenes numbers decreased by 1.4, 4.4, and >4.6 log CFU/g in date paste stored at 4, 10, and 24°C for 90 days, respectively. In date syrup, numbers of L. monocytogenes decreased to undetectable levels by 50, 14, and 4 days at 4, 10, and 24°C, respectively, by direct plating and complete elimination was observed at 10 and 24°C by 50 and 30 days of storage, respectively. The initial pH values of date paste and syrup were 4.7 and 4.8, respectively, and remained stable until the end of storage except for L. monocytogenes-inoculated syrup. PRACTICAL APPLICATION: Salmonella enterica and Listeria monocytogenes can easily survive in date paste and syrup particularly at refrigerator temperature, which explains the necessity of preventing the contamination of date products with foodborne pathogens.
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Affiliation(s)
- Amin N Olaimat
- Department of Clinical Nutrition and Dietetics, Faculty of Applied Medical Sciences, The Hashemite University, Zarqa, Jordan
| | - Murad A Al-Holy
- Department of Clinical Nutrition and Dietetics, Faculty of Applied Medical Sciences, The Hashemite University, Zarqa, Jordan
| | - Mahmoud H Abughoush
- Department of Clinical Nutrition and Dietetics, Faculty of Applied Medical Sciences, The Hashemite University, Zarqa, Jordan
- Science of Nutrition and Dietetics Program, College of Pharmacy, Al Ain University, Abu Dhabi, United Arab Emirates
| | - Lamees Daseh
- Department of Clinical Nutrition and Dietetics, Faculty of Applied Medical Sciences, The Hashemite University, Zarqa, Jordan
| | - Anas A Al-Nabulsi
- Department of Nutrition and Food Technology, Faculty of Agriculture, Jordan University of Science and Technology, Irbid, Jordan
| | - Tareq M Osaili
- Department of Clinical Nutrition and Dietetics, College of Health Sciences, University of Sharjah, Sharjah, United Arab Emirates
- Department of Nutrition and Food Technology, Faculty of Agriculture, Jordan University of Science and Technology, Irbid, Jordan
| | - Walid Al-Rousan
- Department of Nutrition and Food Processing, Al-Huson University College, Al-Balqa Applied University, Al-Huson, Jordan
| | - Sofyan Maghaydah
- Department of Nutrition and Food Technology, Faculty of Agriculture, Jordan University of Science and Technology, Irbid, Jordan
- Department of Human Nutrition and Dietetics, College of Health Sciences, Abu Dhabi University, Zayed City, Abu Dhabi, United Arab Emirates
| | - Mutamed Ayyash
- Department of Food, Nutrition and Health, College of Food and Agriculture, United Arab Emirates University, Al Ain, United Arab Emirates
| | - Richard A Holley
- Department of Food and Human Nutritional Sciences, University of Manitoba, Winnipeg, Canada
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Olaimat AN, Taha S, Osaili TM, Aolymat I, Alzyoud JA, Al-Holy MA, Herzallah S, Al-Nabulsi ZA, Abu-Ghoush LM, Olaimat TM, Ayyash M, Holley RA. The Role of Communication and Commitment in COVID-19 Knowledge, Attitudes, and Behaviors Among University Students in Jordan: Interaction and Analysis. J Allied Health 2023; 52:149-159. [PMID: 37269034] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Received: 01/12/2022] [Accepted: 03/16/2022] [Indexed: 06/04/2023]
Abstract
INTRODUCTION Several fields, such as public health, economy, and science, have been adversely affected by the COVID-19 pandemic. The objectives of the present study were to investigate knowledge, attitudes, communication, commitment, and behavioral practices of Jordan university students; and using structural equation modelling (SEM) to investigate the relationship among COVID-19 knowledge, attitude, communication, commitment and behavioral practices of students. METHODS In this cross-sectional study, the primary data were collected from 1,095 students comprising 298 males (27.21%) and 797 females (72.79%) from three major universities in Jordan using an online-based questionnaire. RESULTS It was found that scores of knowledge, attitudes, communication, commitment, and behavioral practices of students about COVID-19 were 81.4, 79.3, 70.0, 72.6, and 67.4%, respectively. The results also showed that significant association the variables of knowledge and attitudes as well as the commitment and communication are partial mediators in this relationship. Further, a clear positive relationship was observed between the communication, commitment, and behavioral practices of students. CONCLUSIONS This study confirms the importance of communication and commitment to generate proactive behavioral practices.
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Affiliation(s)
- Amin N Olaimat
- The Hashemite University, PO Box 330127, Zarqa 13133, Jordan. Tel +962 5 390 3333 Ext. 5599.
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Olaimat AN, Sawalha AGA, Al‐Nabulsi AA, Osaili T, Al‐Biss BA, Ayyash M, Holley RA. Chitosan–ZnO nanocomposite coating for inhibition of
Listeria monocytogenes
on the surface and within white brined cheese. J Food Sci 2022; 87:3151-3162. [DOI: 10.1111/1750-3841.16208] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2022] [Revised: 04/28/2022] [Accepted: 05/05/2022] [Indexed: 12/01/2022]
Affiliation(s)
- Amin N. Olaimat
- Department of Clinical Nutrition and Dietetics Faculty of Applied Medical Sciences The Hashemite University P.O. Box 330127 Zarqa 13133 Jordan
| | - Amani Ghazi Ahmad Sawalha
- Department of Nutrition and Food Technology Jordan University of Science and Technology P.O. Box 3030 Irbid 22110 Jordan
| | - Anas A. Al‐Nabulsi
- Department of Nutrition and Food Technology Jordan University of Science and Technology P.O. Box 3030 Irbid 22110 Jordan
| | - Tareq Osaili
- Department of Nutrition and Food Technology Jordan University of Science and Technology P.O. Box 3030 Irbid 22110 Jordan
- Department of Clinical Nutrition and Dietetics College of Health Sciences University of Sharjah Sharjah UAE
| | - Burhan Aldeen Al‐Biss
- Nanomaterials Laboratory Department of Applied Physics Jordan University of Science and Technology P.O. Box 3030 Irbid 22110 Jordan
| | - Mutamed Ayyash
- Department of Food Science College of Food and Agriculture United Arab Emirates University Al Ain UAE
| | - Richard A. Holley
- Department of Food and Human Nutritional Sciences University of Manitoba Winnipeg Canada
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Olaimat AN, Al-Holy MA, Abu Ghoush MH, Al-Nabulsi AA, Osaili TM, Ayyash M, Al-Degs YS, Holley RA. Use of citric acid and garlic extract to inhibit Salmonella enterica and Listeria monocytogenes in hummus. Int J Food Microbiol 2022; 362:109474. [PMID: 34781080 DOI: 10.1016/j.ijfoodmicro.2021.109474] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2021] [Revised: 10/27/2021] [Accepted: 11/04/2021] [Indexed: 11/30/2022]
Abstract
Recently, the consumption of hummus has become popular in the United States, European countries, and Canada, and unfortunately, several foodborne outbreaks and recalls have been reported due to its contamination with Listeria monocytogenes and Salmonella enterica. The current study aimed to investigate the inhibitory activity of 0.5, 1.0, and 1.5% citric acid (CA) and 1.0, 2.0 and 3.0% garlic extract (GE) toward S. enterica and L. monocytogenes in hummus stored at 4, 10 and 24 °C. L. monocytogenes grew well in untreated (control) hummus samples at all tested temperatures, whereas S. enterica grew only at 10 and 24 °C. CA at 0.5 to 1.5% reduced L. monocytogenes numbers by 3.0-3.3 log CFU/g at 4 °C, 1.7-3.9 log CFU/g at 10 °C, and 0.9-1.4 log CFU/g at 24 °C. Numbers of S. enterica were reduced by 0.6-1.7, 4.1-4.9 and <1.5 log CFU/g, at 4, 10 and 24 °C, respectively, compared to the control during 10 d storage. GE at 1.0-3.0% also reduced numbers of L. monocytogenes at 10 d by 0.7-3.0, and 1.3-3.6 log CFU/g at 4 and 10 °C, respectively, and numbers of S. enterica by 0.7-1.2, 1.8-2.6 and 0.5-1.6 log CFU/g, at 4, 10 and 24 °C, respectively, compared to the control. Chromatographic analysis of GE revealed the presence of four organosulfur compounds including diallyl disulfide, diallyl trisulfide, 2-vinyl-(4H)-1,3-dithiin and 3-vinyl-(4H)-1,2-dithiin where the latter was the predominant compound with a level of 22.9 mg/g which significantly contributed to the inhibitory effect of GE. CA and GE are adequate natural antimicrobials in hummus to reduce L. monocytogenes and S. enterica numbers and enhance product safety.
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Affiliation(s)
- Amin N Olaimat
- Department of Clinical Nutrition and Dietetics, Faculty of Applied Medical Sciences, The Hashemite University, P.O. Box 330127, Zarqa 13133, Jordan.
| | - Murad A Al-Holy
- Department of Clinical Nutrition and Dietetics, Faculty of Applied Medical Sciences, The Hashemite University, P.O. Box 330127, Zarqa 13133, Jordan
| | - Mahmoud H Abu Ghoush
- Department of Clinical Nutrition and Dietetics, Faculty of Applied Medical Sciences, The Hashemite University, P.O. Box 330127, Zarqa 13133, Jordan; Science of Nutrition and Dietetics Program, College of Pharmacy, Al Ain University, P.O. Box 64141, Abu Dhabi, United Arab Emirates
| | - Anas A Al-Nabulsi
- Department of Nutrition and Food Technology, Faculty of Agriculture, Jordan University of Science and Technology, Irbid, Jordan
| | - Tareq M Osaili
- Department of Nutrition and Food Technology, Faculty of Agriculture, Jordan University of Science and Technology, Irbid, Jordan; Department of Clinical Nutrition and Dietetics, College of Health Sciences, University of Sharjah, Sharjah, United Arab Emirates
| | - Mutamed Ayyash
- Department of Food, Nutrition and Health, College of Food and Agriculture, United Arab Emirates University, Al Ain, United Arab Emirates
| | - Yahya S Al-Degs
- Department of Chemistry, Faculty of Science, The Hashemite University, P.O. Box 330127, Zarqa 13133, Jordan
| | - Richard A Holley
- Department of Food and Human Nutritional Sciences, University of Manitoba, Winnipeg, Canada
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Olaimat AN, Al-Nabulsi AA, Osaili TM, Al-Holy M, Abu Ghoush M, Alkhalidy H, Jaradat ZW, Ayyash M, Holley RA. Inactivation of stressed Salmonella enterica, Escherichia coli O157:H7, and Listeria monocytogenes in hummus using low dose gamma irradiation. J Food Sci 2022; 87:845-855. [PMID: 35040133 DOI: 10.1111/1750-3841.16036] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2021] [Revised: 12/13/2021] [Accepted: 12/17/2021] [Indexed: 11/28/2022]
Abstract
Hummus is a popular dip in the Middle East region prepared by mixing the boiled chickpeas with tahini and other ingredients, and because its consumption has increased world-wide some notoriety has developed following an increase in the incidence of hummus-related illness outbreaks and recalls. The objectives of the current research were (i) to study the efficiency of low dose gamma irradiation to inhibit Escherichia coli O157:H7, Salmonella enterica, and Listeria monocytogenes in hummus, and (ii) to assess the effect of environmental stresses namely cold, heat, and desiccation on the resistance of these pathogens to gamma irradiation. The samples of hummus were prepared and then individually inoculated with approximately 7.0 log CFU/g of unstressed or cold-, heat-, or desiccated-stressed cocktail cultures of each of E. coli O157:H7, S. enterica, and L. monocytogenes. The inoculated samples were then exposed to gamma irradiation at doses of 0.1 to 0.6 kGy. The numbers of unstressed E. coli O157:H7, S. enterica, and L. monocytogenes were decreased by 0.6-3.9, 0.7-2.9, and 1.0-3.0 log CFU/g, respectively, by irradiation treatment. The resistance of E. coli O157:H7 to gamma irradiation was not affected by desiccation, heat, and cold stresses. However, the pre-exposure of S. enterica and L. monocytogenes cells to these stresses reduced their resistance toward gamma irradiation. PRACTICAL APPLICATION: Gamma irradiation is a non-thermal treatment that can be used in food processing to ensure food safety and quality. The current study proved that low levels (≤0.6 kGy) of gamma irradiation can effectively decrease the risk of unstressed and cold-, heat-, or desiccation-stressed Salmonella enterica, Listeria monocytogenes, or Escherichia coli O157:H7 in hummus.
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Affiliation(s)
- Amin N Olaimat
- Department of Clinical Nutrition and Dietetics, Faculty of Applied Medical Sciences, The Hashemite University, P.O. Box 330127, Zarqa, 13133, Jordan
| | - Anas A Al-Nabulsi
- Department of Nutrition and Food Technology, Faculty of Agriculture, Jordan University of Science and Technology, Irbid, 22110, Jordan
| | - Tareq M Osaili
- Department of Nutrition and Food Technology, Faculty of Agriculture, Jordan University of Science and Technology, Irbid, 22110, Jordan.,Department of Clinical Nutrition and Dietetics, College of Health Sciences, University of Sharjah, P.O Box 27272, Sharjah, United Arab Emirates
| | - Murad Al-Holy
- Department of Clinical Nutrition and Dietetics, Faculty of Applied Medical Sciences, The Hashemite University, P.O. Box 330127, Zarqa, 13133, Jordan
| | - Mahmoud Abu Ghoush
- Department of Clinical Nutrition and Dietetics, Faculty of Applied Medical Sciences, The Hashemite University, P.O. Box 330127, Zarqa, 13133, Jordan.,Science of Nutrition and Dietetics Program, College of Pharmacy, Al Ain University, P.O. Box 64141, Abu Dhabi, United Arab Emirates
| | - Hana Alkhalidy
- Department of Nutrition and Food Technology, Faculty of Agriculture, Jordan University of Science and Technology, Irbid, 22110, Jordan
| | - Ziad W Jaradat
- Department of Biotechnology and Genetic Engineering, Faculty of Science and Arts, Jordan University of Science and Technology, Irbid, 22110, Jordan
| | - Mutamed Ayyash
- Department of Food Science, College of Food and Agriculture, United Arab Emirates University, Al Ain, 15551, United Arab Emirates
| | - Richard A Holley
- Department of Food and Human Nutritional Sciences, University of Manitoba, Winnipeg, MB, R3T 2N2, Canada
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Mutlaq S, Albiss B, Al-Nabulsi AA, Jaradat ZW, Olaimat AN, Khalifeh MS, Osaili T, Ayyash MM, Holley RA. Conductometric Immunosensor for Escherichia coli O157:H7 Detection Based on Polyaniline/Zinc Oxide (PANI/ZnO) Nanocomposite. Polymers (Basel) 2021; 13:polym13193288. [PMID: 34641104 PMCID: PMC8512834 DOI: 10.3390/polym13193288] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2021] [Revised: 09/15/2021] [Accepted: 09/16/2021] [Indexed: 11/16/2022] Open
Abstract
A conductometric immunosensor was developed for the detection of one of the most common foodborne pathogens, Escherichia coli O157:H7 (E. coli O157:H7), by conductometric sensing. The sensor was built based on a polyaniline/zinc oxide (PANI/ZnO) nanocomposite film spin-coated on a gold electrode. Then, it was modified with a monoclonal anti-E. coli O157:H7 antibody as a biorecognition element. The fabricated nanostructured sensor was able to quantify the pathogens under optimal detection conditions, within 30 min, and showed a good detection range from 101 to 104 CFU/mL for E. coli O157:H7 and a minimum detection limit of 4.8 CFU/mL in 0.1% peptone water. The sensor efficiency for detecting bacteria in food matrices was tested in ultra-heat-treated (UHT) skim milk. E. coli O157:H7 was detected at concentrations of 101 to 104 CFU/mL with a minimum detection limit of 13.9 CFU/mL. The novel sensor was simple, fast, highly sensitive with excellent specificity, and it had the potential for rapid sample processing. Moreover, this unique technique for bacterial detection could be applicable for food safety and quality control in the food sector as it offers highly reliable results and is able to quantify the target bacterium.
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Affiliation(s)
- Sawsan Mutlaq
- Department of Nutrition and Food Technology, Jordan University of Science and Technology, P.O. Box 3030, Irbid 22110, Jordan; (S.M.); (A.A.A.-N.); (T.O.)
| | - Borhan Albiss
- Nanomaterials Laboratory, Department of Applied Physics, Jordan University of Science and Technology, P.O. Box 3030, Irbid 22110, Jordan
- Correspondence:
| | - Anas A. Al-Nabulsi
- Department of Nutrition and Food Technology, Jordan University of Science and Technology, P.O. Box 3030, Irbid 22110, Jordan; (S.M.); (A.A.A.-N.); (T.O.)
| | - Ziad W. Jaradat
- Department of Biotechnology and Genetic Engineering, Jordan University of Science and Technology, P.O. Box 3030, Irbid 22110, Jordan;
| | - Amin N. Olaimat
- Department of Clinical Nutrition and Dietetics, Faculty of Applied Medical Sciences, The Hashemite University, P.O. Box 330127, Zarqa 13133, Jordan;
| | - Mohammad S. Khalifeh
- Department of Basic Medical Veterinary Sciences, Jordan University of Science and Technology, P.O. Box 3030, Irbid 22110, Jordan;
| | - Tareq Osaili
- Department of Nutrition and Food Technology, Jordan University of Science and Technology, P.O. Box 3030, Irbid 22110, Jordan; (S.M.); (A.A.A.-N.); (T.O.)
- Department of Clinical Nutrition and Dietetics, College of Health Sciences, University of Sharjah, Sharjah P.O. Box 27272, United Arab Emirates
| | - Mutamed M. Ayyash
- Department of Food Science, College of Agriculture and Veterinary Medicine, United Arab Emirates University (UAEU), Al Ain P.O. Box 15551, United Arab Emirates;
| | - Richard A. Holley
- Department of Food and Human Nutritional Sciences, University of Manitoba, Winnipeg, MB R3T 2N2, Canada;
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Al-Nabulsi AA, Osaili TM, Oqdeh SB, Olaimat AN, Jaradat ZW, Ayyash M, Holley RA. Antagonistic effects of Lactobacillus reuteri against Escherichia coli O157:H7 in white-brined cheese under different storage conditions. J Dairy Sci 2021; 104:2719-2734. [PMID: 33455758 DOI: 10.3168/jds.2020-19308] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2020] [Accepted: 11/03/2020] [Indexed: 01/23/2023]
Abstract
This study aimed to investigate the survival of the foodborne pathogen Escherichia coli O157:H7 in white-brined cheeses as influenced by the presence of Lactobacillus reuteri. The white cheeses were made from pasteurized bovine milk inoculated with E. coli O157:H7 (cocktail of 3 strains) to achieve ∼5 log10 cfu/g with absence or presence of Lb. reuteri (∼6 log10 cfu/g). Cheese samples were brined in 10% or 15% NaCl solution and stored at 10°C and 25°C for 28 d. The white-brined cheeses were assessed for salt content, pH, water activity (Aw), and numbers of E. coli O157:H7, Lb. reuteri, nonstarter lactic acid bacteria (NSLAB), yeasts, and molds. Results showed that E. coli O157:H7 survived in cheese stored in both brine solutions at 10°C and 25°C regardless of the presence of Lb. reuteri. A substantial reduction was observed in cheese stored in 10% NaCl brine at 25°C, followed by cheese stored in 15% NaCl brine at 10°C by 2.64 and 2.16 log10 cfu/g, respectively, in the presence of Lb. reuteri and by 1.02 and 1.87 log10 cfu/g, respectively, in the absence of Lb. reuteri under the same conditions. The pathogen in brine solutions survived but at a lower rate. Furthermore, the growth of Lb. reuteri and NSLAB were enhanced or slightly decreased in cheese and brine by 28 d, respectively. The salt concentrations of cheese ranged from 4 to 6% and 5 to 7% (wt/wt), during 28-d ripening in 10 and 15% brine, respectively. Values of pH and Aw slightly increased at d 1 after exposure to brine and reached 4.69 to 6.08 and 0.91 to 0.95, respectively, in all treatments. Therefore, the addition of Lb. reuteri can be used as a biopreservation method to inhibit the survival of E. coli O157:H7 in white-brined cheese when combined with the appropriate temperature, NaCl level, and storage time.
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Affiliation(s)
- Anas A Al-Nabulsi
- Department of Nutrition and Food Technology, Jordan University of Science and Technology, Irbid 22110, Jordan.
| | - Tareq M Osaili
- Department of Nutrition and Food Technology, Jordan University of Science and Technology, Irbid 22110, Jordan; Department of Clinical Nutrition and Dietetics, University of Sharjah, PO Box 27272, Sharjah, United Arab Emirates
| | - Saba B Oqdeh
- Department of Nutrition and Food Technology, Jordan University of Science and Technology, Irbid 22110, Jordan
| | - Amin N Olaimat
- Department of Clinical Nutrition and Dietetics, Faculty of Applied Medical Sciences, The Hashemite University, Zarqa 13115, Jordan
| | - Ziad W Jaradat
- Department of Biotechnology and Genetic Engineering, Jordan University of Science and Technology, Irbid 22110, Jordan
| | - Mutamed Ayyash
- Department of Food Science, College of Food and Agriculture, United Arab Emirates University, Al-Ain, 15551, United Arab Emirates.
| | - Richard A Holley
- Department of Food and Human Nutritional Sciences, University of Manitoba, Winnipeg, MB R3T 2N2 Canada
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Olaimat AN, Aolymat I, Elsahoryi N, Shahbaz HM, Holley RA. Attitudes, Anxiety, and Behavioral Practices Regarding COVID-19 among University Students in Jordan: A Cross-Sectional Study. Am J Trop Med Hyg 2020; 103:1177-1183. [PMID: 32662398 PMCID: PMC7470553 DOI: 10.4269/ajtmh.20-0418] [Citation(s) in RCA: 40] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2020] [Accepted: 06/30/2020] [Indexed: 01/08/2023] Open
Abstract
The COVID-19 pandemic represents a major public health, economic, political, and scientific concern in most countries around the globe where COVID-19 cases and deaths have been confirmed. This study assessed the attitudes, anxiety, and behavioral practices of university students in Jordan regarding COVID-19 during the early period of the infection (March 19-21, 2020) using a validated, self-administered survey questionnaire. Positive attitudes or low-risk practices were given 1 point, whereas negative attitudes or high-risk practices were scored 0. Percentages of the total score were used for categorizing data into negative attitudes or high-risk practices (≤ 60%), moderate attitudes or moderate-risk practices (60.01-80%), and positive attitudes or low-risk practices (> 80%). Generally, the university students displayed positive attitudes and low-risk practices toward preventing COVID-19, with an average score of 81.1% and 84.3%, respectively. Approximately two-thirds (69.1%) of the students showed a positive attitude toward COVID-19 seriousness, concern of contracting the virus, and the appropriate prevention measures, and low-risk practices (67.6%) toward preventing COVID-19 including implementation of social distancing and good hygiene. Female, older, medical, or postgraduate students practiced significantly more (P ≤ 0.05) appropriate hygiene and social distancing behaviors toward COVID-19 than their counterparts of each group. More than two-thirds (69.2%) of the students were anxious that they might become infected with COVID-19. These results are important for health authorities to develop appropriate educational programs and protective health measures including good respiratory etiquette and handwashing practices, to enhance safer lifestyles and prevent COVID-19 transmission.
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Affiliation(s)
- Amin N. Olaimat
- Department of Clinical Nutrition and Dietetics, Faculty of Applied Medical Sciences, The Hashemite University, Zarqa, Jordan
| | - Iman Aolymat
- Department of Cellular and Molecular Physiology, Faculty of Health and Life Sciences, School of Medicine, University of Liverpool, Liverpool, United Kingdom
- Department of Basic Medical Sciences, Faculty of Medicine, The Hashemite University, Zarqa, Jordan
| | - Nour Elsahoryi
- Department of Nutrition, Faculty of Pharmacy and Medical Sciences, University of Petra, Amman, Jordan
| | - Hafiz M. Shahbaz
- Department of Food Science and Human Nutrition, University of Veterinary and Animal Sciences, Lahore, Pakistan
| | - Richard A. Holley
- Department of Food and Human Nutritional Sciences, University of Manitoba, Winnipeg, Canada
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Olaimat AN, Shahbaz HM, Fatima N, Munir S, Holley RA. Food Safety During and After the Era of COVID-19 Pandemic. Front Microbiol 2020; 11:1854. [PMID: 32849446 PMCID: PMC7417330 DOI: 10.3389/fmicb.2020.01854] [Citation(s) in RCA: 66] [Impact Index Per Article: 16.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2020] [Accepted: 07/15/2020] [Indexed: 01/08/2023] Open
Abstract
The coronavirus disease 2019 (COVID-19) is a clinical syndrome caused by severe acute respiratory syndrome corona virus-2 (SARS-CoV-2). COVID-19 was declared a pandemic by the World Health Organization (WHO) on March 11, 2020 due to its rapid and extensive spread among many countries through its very contagious nature and its high mortality among the elderly and infirm. Recently, data on the survival of SARS-CoV-2 on contact surfaces has been reported, but there is none on the survival of COVID-19 on food surfaces and packages. The potential survival and transmission of SARS-CoV-2 on/via food and packages are discussed based on data available for other respiratory viruses such as SARS-CoV and MERS-CoV. However, studies are needed to explore its transmission via food and survival on food packaging materials. The implementation of food safety management systems such as Hazard Analysis and Critical Control Points (HACCP), and Good Manufacturing Practices (GMP) are important to reduce the risk of COVID-19 infection. Cleaning, sanitation, good hygienic practices, and active packaging are also needed from farm to fork.
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Affiliation(s)
- Amin N. Olaimat
- Department of Clinical Nutrition and Dietetics, Faculty of Applied Medical Sciences, The Hashemite University, Zarqa, Jordan
| | - Hafiz M. Shahbaz
- Department of Food Science and Human Nutrition, University of Veterinary and Animal Sciences, Lahore, Pakistan
| | - Nayab Fatima
- Department of Food Science and Human Nutrition, University of Veterinary and Animal Sciences, Lahore, Pakistan
| | - Sadia Munir
- College of Food Science and Technology, Huazhong Agricultural University, Wuhan, China
| | - Richard A. Holley
- Department of Food and Human Nutritional Sciences, University of Manitoba, Winnipeg, MB, Canada
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11
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Al-Nabulsi AA, Osaili TM, AbuNaser RA, Olaimat AN, Ayyash M, Al-Holy MA, Kadora KM, Holley RA. Factors affecting the viability of Staphylococcus aureus and production of enterotoxin during processing and storage of white-brined cheese. J Dairy Sci 2020; 103:6869-6881. [PMID: 32505390 DOI: 10.3168/jds.2020-18158] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2020] [Accepted: 04/01/2020] [Indexed: 12/24/2022]
Abstract
Staphylococcus aureus is a major foodborne pathogen that causes severe disease in humans. It is commonly found in milk and dairy products, particularly in fresh brined cheese. Our aim was to investigate the behavior of Staph. aureus and enterotoxin production during the storage of white-brined cheese prepared with or without a starter culture and stored in a 10 or 15% NaCl brine at 10°C and 25°C for 28 d. NaCl concentration, water activity, pH, and number of Staph. aureus and lactic acid bacteria were determined in cheese and brine. Only 1 of 4 Staph. aureus strains (ATCC 439) was positive for enterotoxin production, and its production was detected in unsalted UHT milk, but not in salted milk or in any of the cheese treatments held at 37°C for 1, 3, or 7 d. Staphylococcus aureus grew in the cheese stored in both brines at 10°C and 25°C, regardless of the presence of a starter culture, although the latter significantly reduced Staph. aureus growth in cheese or its brine at 10°C. Staphylococcus aureus numbers were increased by 2.26 and 0.47 log10 cfu/g in cheese stored in 10 and 15% NaCl brine, respectively, in the presence of starter culture, and by 2.78 and 2.96 log10 cfu/g, respectively, in the absence of starter culture at 10°C. Nonetheless, the pathogen grew, but at a lower number in the brines. The salt concentration of cheese stored in 10% brine remained at approximately 5% during storage; however, in 15% brine, the salt concentration increased to almost 8% (wt/wt) by 28 d. The addition of a starter culture, high salt concentration, low temperature, and pH (∼5.2) had inhibitory effects on the growth of Staph. aureus. Moreover, lactic acid bacterial numbers increased considerably in cheese and brine by d 28. The use of starter cultures, salt (15%), and low storage temperature (10°C) reduced the growth of Staph. aureus, and salt may have prevented enterotoxin production in white-brined cheese.
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Affiliation(s)
- Anas A Al-Nabulsi
- Department of Nutrition and Food Technology, Jordan University of Science and Technology, Irbid 22110, Jordan.
| | - Tareq M Osaili
- Department of Nutrition and Food Technology, Jordan University of Science and Technology, Irbid 22110, Jordan; Department of Clinical Nutrition and Dietetics, University of Sharjah, Sharjah, PO Box 27272, United Arab Emirates
| | - Roa A AbuNaser
- Department of Nutrition and Food Technology, Jordan University of Science and Technology, Irbid 22110, Jordan
| | - Amin N Olaimat
- Department of Clinical Nutrition and Dietetics, Faculty of Allied Health Sciences, Hashemite University, Zarqa 13115, Jordan
| | - Mutamed Ayyash
- Department of Food, Nutrition, and Health, College of Food and Agriculture, United Arab Emirates University, Al-Ain 15551, United Arab Emirates.
| | - Murad A Al-Holy
- Department of Clinical Nutrition and Dietetics, Faculty of Allied Health Sciences, Hashemite University, Zarqa 13115, Jordan
| | - Khaled M Kadora
- Department of Food Laboratories, Jordan Food and Drug Administration, Amman 11181, Jordan
| | - Richard A Holley
- Department of Food and Human Nutritional Sciences, University of Manitoba, Winnipeg, MB R3T 2N2, Canada
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Olaimat AN, Aolymat I, Shahbaz HM, Holley RA. Knowledge and Information Sources About COVID-19 Among University Students in Jordan: A Cross-Sectional Study. Front Public Health 2020; 8:254. [PMID: 32574314 PMCID: PMC7274134 DOI: 10.3389/fpubh.2020.00254] [Citation(s) in RCA: 84] [Impact Index Per Article: 21.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2020] [Accepted: 05/21/2020] [Indexed: 12/19/2022] Open
Abstract
Background: Coronavirus disease 2019 (COVID-19) has rapidly spread worldwide, and it was officially declared to be a pandemic by the World Health Organization (WHO) on March 11, 2020. Most countries over the entire globe have reported some COVID-19 cases. The current study aimed to assess student knowledge about COVID-19 at different Jordanian universities and determine where they sourced their information. Methods:A cross-sectional study was conducted among 2,083 undergraduate or postgraduate students from different governmental and private universities during the initial stage of the disease in Jordan (March 19–21, 2020) using a validated, structured, self-administered, online questionnaire. The survey was structured to assess their knowledge about viral sources, incubation period, mortality rate, transmission, symptoms and complications as well as the source of information about COVID-19. Results:Overall, 56.5% of the respondents showed good knowledge and almost 40.5% showed moderate knowledge. On the other hand, 3.0% of the participants showed poor knowledge about COVID-19. The average knowledge score of students was 80.1%, which is considered to be within the scale of good knowledge. Both the college of study and educational level significantly (P < 0.05) associated with student knowledge. Students who majored in medical sciences showed the highest mean score of 82.8%, with 69.0% displaying a good knowledge level. Postgraduate students had significantly higher knowledge scores compared to undergraduate students. The majority of students used the internet, social media and mass media as sources of information about COVID-19. Scientific websites and articles were used more commonly by medical and postgraduate students. Conclusions:The COVID-19 pandemic is a major challenge to the health of the world population; therefore, these results assessing students' knowledge provide an important baseline for planning required educational interventions such as contact tracing and self-quarantine. These results may also help public health authorities by engaging communities in implementation of protective health measures, including positive hygienic practices such as hand washing to reduce the risk of COVID-19.
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Affiliation(s)
- Amin N Olaimat
- Department of Clinical Nutrition and Dietetics, Faculty of Applied Medical Sciences, The Hashemite University, Zarqa, Jordan
| | - Iman Aolymat
- Department of Cellular and Molecular Physiology, Faculty of Health and Life Sciences, School of Medicine, University of Liverpool, Liverpool, United Kingdom.,Department of Basic Medical Sciences, Faculty of Medicine, The Hashemite University, Zarqa, Jordan
| | - Hafiz M Shahbaz
- Department of Food Science and Human Nutrition, University of Veterinary and Animal Sciences, Lahore, Pakistan
| | - Richard A Holley
- Department of Food and Human Nutritional Sciences, University of Manitoba, Winnipeg, MB, Canada
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13
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Olaimat AN, Al-Holy MA, Shahbaz HM, Al-Nabulsi AA, Abu Ghoush MH, Osaili TM, Ayyash MM, Holley RA. Emergence of Antibiotic Resistance in Listeria monocytogenes Isolated from Food Products: A Comprehensive Review. Compr Rev Food Sci Food Saf 2018; 17:1277-1292. [PMID: 33350166 DOI: 10.1111/1541-4337.12387] [Citation(s) in RCA: 114] [Impact Index Per Article: 19.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2018] [Revised: 04/07/2018] [Accepted: 06/07/2018] [Indexed: 12/12/2022]
Abstract
Listeria monocytogenes is an opportunistic pathogen that has been involved in several deadly illness outbreaks. Future outbreaks may be more difficult to manage because of the emergence of antibiotic resistance among L. monocytogenes strains isolated from food products. The present review summarizes the available evidence on the emergence of antibiotic resistance among L. monocytogenes strains isolated from food products and the possible ways this resistance has developed. Furthermore, the resistance of food L. monocytogenes isolates to antibiotics currently used in the treatment of human listeriosis such as penicillin, ampicillin, tetracycline, and gentamicin, has been documented. Acquisition of movable genetic elements is considered the major mechanism of antibiotic resistance development in L. monocytogenes. Efflux pumps have also been linked with resistance of L. monocytogenes to some antibiotics including fluoroquinolones. Some L. monocytogenes strains isolated from food products are intrinsically resistant to several antibiotics. However, factors in food processing chains and environments (from farm to table) including extensive or sub-inhibitory antibiotics use, horizontal gene transfer, exposure to environmental stresses, biofilm formation, and presence of persister cells play crucial roles in the development of antibiotic resistance by L. monocytogenes.
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Affiliation(s)
- Amin N Olaimat
- Dept. of Clinical Nutrition and Dietetics, Faculty of Allied Health Sciences, Hashemite Univ., P.O. Box 150459, Zarqa, 13115, Jordan
| | - Murad A Al-Holy
- Dept. of Clinical Nutrition and Dietetics, Faculty of Allied Health Sciences, Hashemite Univ., P.O. Box 150459, Zarqa, 13115, Jordan
| | - Hafiz M Shahbaz
- Dept. of Food Science and Human Nutrition, Univ. of Veterinary and Animal Sciences, Lahore, 54000, Pakistan
| | - Anas A Al-Nabulsi
- Dept. of Nutrition and Food Technology, Jordan Univ. of Science and Technology, P.O. Box 3030, Irbid, Jordan
| | - Mahmoud H Abu Ghoush
- Dept. of Clinical Nutrition and Dietetics, Faculty of Allied Health Sciences, Hashemite Univ., P.O. Box 150459, Zarqa, 13115, Jordan
| | - Tareq M Osaili
- Dept. of Nutrition and Food Technology, Jordan Univ. of Science and Technology, P.O. Box 3030, Irbid, Jordan.,Dept. of Clinical Nutrition and Dietetics, College of Health Sciences, Univ. of Sharjah, Sharjah, United Arab Emirates
| | - Mutamed M Ayyash
- Dept. of Food Science, United Arab Emirates Univ., Al Ain, United Arab Emirates
| | - Richard A Holley
- Dept. of Food and Human Nutritional Sciences, Faculty of Agricultural and Food Sciences, Univ. of Manitoba, Winnipeg, Manitoba, R3T 2N2, Canada
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Al-Rousan WM, Olaimat AN, Osaili TM, Al-Nabulsi AA, Ajo RY, Holley RA. Use of acetic and citric acids to inhibit Escherichia coli O157:H7, Salmonella Typhimurium and Staphylococcus aureus in tabbouleh salad. Food Microbiol 2018. [DOI: 10.1016/j.fm.2018.01.001] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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15
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Olaimat AN, Al-Holy MA, Abu Ghoush MH, Al-Nabulsi AA, Qatatsheh AA, Shahbaz HM, Osaili TM, Holley RA. The Use of Malic and Acetic Acids in Washing Solution to Control Salmonella spp. on Chicken Breast. J Food Sci 2018; 83:2197-2203. [PMID: 30053312 DOI: 10.1111/1750-3841.14286] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2018] [Revised: 05/27/2018] [Accepted: 06/18/2018] [Indexed: 12/15/2022]
Abstract
Salmonella is a persisting contaminant in poultry products that may pose a potential risk to consumers. Thus, developing decontamination strategies to eliminate or reduce this pathogen in chicken is crucial. The objective of the current study was to investigate the antimicrobial activity of malic acid (MA) and acetic acid (AA) or their combination against Salmonella on chicken breast at 4 °C for 10 days. The effect of storage temperature (4 and 21 °C) on Salmonella inactivation was also investigated for up to 21 days. Five serovars of Salmonella were inoculated in a model Mueller-Hinton (MH) broth system to a level of about 7 log10 CFU/mL and the broth was treated with 5 mg/mL of each of MA, AA or their combination. AA was more effective than MA in the model system at 21 °C, where it resulted in total elimination of Salmonella, but MA was more effective in eliminating Salmonella at 4 °C. However, the combined MA and AA solutions were more effective than either MA or AA alone. When applying washing solutions containing 5 mg/mL of either of MA, AA, or their combination to chicken breast inoculated with about 5 log10 CFU/g, the MA+AA washing solution was the most effective. It resulted in complete elimination of Salmonella from chicken breast and rendered a significant reduction in mesophilic aerobic bacteria and lactic acid bacteria numbers. PRACTICAL APPLICATION This study indicates that the use of a washing solution containing MA and AA could improve the safety and extend the shelf life of raw chicken by substantially reducing Salmonella and contaminating microflora on the product.
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Affiliation(s)
- Amin N Olaimat
- Dept. of Clinical Nutrition and Dietetics, Faculty of Allied Health Sciences, Hashemite Univ., P.O. Box 150459, Zarqa, 13115, Jordan
| | - Murad A Al-Holy
- Dept. of Clinical Nutrition and Dietetics, Faculty of Allied Health Sciences, Hashemite Univ., P.O. Box 150459, Zarqa, 13115, Jordan
| | - Mahmoud H Abu Ghoush
- Dept. of Clinical Nutrition and Dietetics, Faculty of Allied Health Sciences, Hashemite Univ., P.O. Box 150459, Zarqa, 13115, Jordan
| | - Anas A Al-Nabulsi
- Dept. of Nutrition and Food Technology, Jordan Univ. of Science and Technology, P.O. Box 3030, Irbid, Jordan
| | - Ala A Qatatsheh
- Dept. of Nursing, Princess Aisha Bint Al-Hussein Faculty of Nursing, Al-Hussein Bin Talal Univ., Ma'an, Jordan.,Dept. of Clinical Nutrition, Faculty of Applied Health Sciences, Qassim Univ., Arrass, Saudi Arabia
| | - Hafiz M Shahbaz
- Dept. of Food Science and Human Nutrition, Univ. of Veterinary and Animal Sciences, Lahore, 54000, Pakistan
| | - Tareq M Osaili
- Dept. of Nutrition and Food Technology, Jordan Univ. of Science and Technology, P.O. Box 3030, Irbid, Jordan.,Dept. of Clinical Nutrition and Dietetics, College of Health Science, Univ. of Sharjah, Sharjah, United Arab Emirates
| | - Richard A Holley
- Dept. of Food and Human Nutritional Sciences, Faculty of Agricultural and Food Sciences, Univ. of Manitoba, Winnipeg, Manitoba, R3T 2N2, Canada
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Visvalingam J, Palaniappan K, Holley RA. In vitro enhancement of antibiotic susceptibility of drug resistant Escherichia coli by cinnamaldehyde. Food Control 2017. [DOI: 10.1016/j.foodcont.2017.04.011] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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17
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Mehyar GF, Al Nabulsi AA, Saleh M, Olaimat AN, Holley RA. Effects of chitosan coating containing lysozyme or natamycin on shelf-life, microbial quality, and sensory properties of Halloumi cheese brined in normal and reduced salt solutions. J FOOD PROCESS PRES 2017. [DOI: 10.1111/jfpp.13324] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Affiliation(s)
- Ghadeer F. Mehyar
- Department of Nutrition and Food Technology; The University of Jordan; Amman 11942 Jordan
| | - Anas A. Al Nabulsi
- Department of Nutrition and Food Technology, Faculty of Agriculture; Jordan University of Science and Technology; Irbid Jordan
| | - Mohammed Saleh
- Department of Nutrition and Food Technology; The University of Jordan; Amman 11942 Jordan
| | - Amin N. Olaimat
- Department of Clinical Nutrition and Dietetics; Hashemite University; Zarqa 13133 Jordan
| | - Richard A. Holley
- Department of Food Science; University of Manitoba; Winnipeg MB R3T 2N2 Canada
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18
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Al-Nabulsi AA, Osaili TM, Mahmoud KZ, Ayyash MM, Olaimat AN, Shaker RR, Holley RA. Modeling the combined effect of NaCl and pH againstCronobacterspp. using response surface methodology. J Food Saf 2016. [DOI: 10.1111/jfs.12303] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Anas A. Al-Nabulsi
- Department of Nutrition and Food Technology; Jordan University of Science and Technology; Irbid 22110 Jordan
| | - Tareq M. Osaili
- Department of Nutrition and Food Technology; Jordan University of Science and Technology; Irbid 22110 Jordan
| | - Kamel Z. Mahmoud
- Department of Animal Production; Jordan University of Science and Technology; Irbid 22110 Jordan
| | - Mutamed M. Ayyash
- Department of Food Science; United Arab Emirates University; Al-Ain 15551 UAE
| | - Amin N. Olaimat
- Department of Clinical Nutrition and Dietetics; Hashemite University; Zarqa JO
| | - Reyad R. Shaker
- Department of Clinical Nutrition; University of Sharjah; P.O.BOX 27272 Sharjah AE 27272
| | - Richard A. Holley
- Department of Food Science; University of Manitoba; Winnipeg MB R3T 2N2 Canada
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19
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Al-Nabulsi AA, Olaimat AN, Osaili TM, Ayyash MM, Abushelaibi A, Jaradat ZW, Shaker R, Al-Taani M, Holley RA. Behavior of Escherichia coli O157:H7 and Listeria monocytogenes during fermentation and storage of camel yogurt. J Dairy Sci 2015; 99:1802-1811. [PMID: 26723116 DOI: 10.3168/jds.2015-9872] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2015] [Accepted: 11/08/2015] [Indexed: 11/19/2022]
Abstract
In addition to its nutritional and therapeutic properties, camel milk has the ability to suppress the growth of a wide range of foodborne pathogens, but there is a lack of information regarding the behavior of these pathogens in products such as yogurt produced from camel milk. The objective of the current study was to investigate the behavior of Listeria monocytogenes and Escherichia coli O157:H7 during manufacture and storage of camel yogurt. Camel milk inoculated with L. monocytogenes and E. coli O157:H7 was fermented at 43° C for 5h using freeze-dried lactic acid bacteria (LAB) starter cultures (Streptococcus thermophilus and Lactobacillus bulgaricus) and stored at 4 or 10 °C for 14 d. Camel milk inoculated with L. monocytogenes and E. coli O157:H7 without starter culture was also prepared. During fermentation, the numbers of L. monocytogenes and E. coli O157:H7 increased 0.3 and 1.6 log cfu/mL, respectively, in the presence of LAB, and by 0.3 and 2.7 log cfu/mL in the absence of LAB. During storage at 4 or 10 °C, L. monocytogenes increased 0.8 to 1.2 log cfu/mL by 14 d in camel milk without LAB, but in the presence of LAB, the numbers of L. monocytogenes were reduced by 1.2 to 1.7 log cfu/mL by 14 d. Further, E. coli O157:H7 numbers in camel milk were reduced by 3.4 to 3.5 log cfu/mL in the absence of LAB, but E. coli O157:H7 was not detected (6.3 log cfu/mL reduction) by 7d in camel yogurt made with LAB and stored at either temperature. Although camel milk contains high concentrations of natural antimicrobials, L. monocytogenes was able to tolerate these compounds in camel yogurt stored at refrigerator temperatures. Therefore, appropriate care should be taken during production of yogurt from camel milk to minimize the potential for postprocess contamination by this and other foodborne pathogens.
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Affiliation(s)
- Anas A Al-Nabulsi
- Department of Nutrition and Food Technology, Jordan University of Science and Technology, Irbid 22110, Jordan.
| | - Amin N Olaimat
- Department of Clinical Nutrition and Dietetics, Hashemite University, Zarqa 13133, Jordan
| | - Tareq M Osaili
- Department of Nutrition and Food Technology, Jordan University of Science and Technology, Irbid 22110, Jordan
| | - Mutamed M Ayyash
- Department of Food Science, United Arab Emirates University, Al-Ain 15551, United Arab Emirates
| | - Aisha Abushelaibi
- Department of Food Science, United Arab Emirates University, Al-Ain 15551, United Arab Emirates
| | - Ziad W Jaradat
- Department of Biological and Genetic Engineering, Jordan University of Science and Technology, Irbid 22110, Jordan
| | - Reyad Shaker
- Department of Clinical Nutrition and Dietetics, University of Sharjah, Sharjah 27272, United Arab Emirates
| | - Mahmoud Al-Taani
- Department of Nutrition and Food Technology, Jordan University of Science and Technology, Irbid 22110, Jordan
| | - Richard A Holley
- Department of Food Science, University of Manitoba, Winnipeg, MB, R3T 2N2 Canada
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20
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Miyague L, Macedo RE, Meca G, Holley RA, Luciano FB. Combination of phenolic acids and essential oils against Listeria monocytogenes. Lebensm Wiss Technol 2015. [DOI: 10.1016/j.lwt.2015.05.055] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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21
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Olaimat AN, Holley RA. Control of Salmonella on fresh chicken breasts by κ-carrageenan/chitosan-based coatings containing allyl isothiocyanate or deodorized Oriental mustard extract plus EDTA. Food Microbiol 2015; 48:83-8. [DOI: 10.1016/j.fm.2014.11.019] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2014] [Revised: 10/01/2014] [Accepted: 11/01/2014] [Indexed: 10/24/2022]
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22
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Cordeiro RP, Doria JH, Zhanel GG, Sparling R, Holley RA. Role of glycoside hydrolase genes in sinigrin degradation by E. coli O157:H7. Int J Food Microbiol 2015; 205:105-11. [PMID: 25897994 DOI: 10.1016/j.ijfoodmicro.2015.04.008] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2015] [Revised: 04/01/2015] [Accepted: 04/04/2015] [Indexed: 11/24/2022]
Abstract
This work examined Escherichia coli O157:H7 strain 02-0304 for putative genes responsible for sinigrin hydrolysis. Sinigrin is a glucosinolate present in Oriental mustard (Brassica juncea), and its hydrolysis is mediated in plants by the enzyme myrosinase. Sinigrin hydrolysis by plant or bacterial myrosinase yields allyl isothiocyanate (AITC) which is bactericidal. In silico analysis using public databases found sequence similarity between plant myrosinase and enzymes encoded by genes from β-glucosidase families in E. coli O157:H7. Specifically, 6-phospho-β-glucosidase encoded by the genes bglA and ascB (family 1), and chbF (family 4) present in E. coli O157:H7 showed the highest similarity. Polymerase chain reaction (PCR) confirmed the presence of bglA, ascB, and chbF in the clinical E. coli strain tested. Disruption of these genes in wild-type E. coli O157:H7 strain 02-0304 using lambda-red replacement created single and double mutants. The relative importance of each gene in the hydrolysis of sinigrin by E. coli O157:H7 was also assessed by comparing gene expression and sinigrin degradation rates among the E. coli O157:H7 wild-type strain and its mutants. The results suggested that the genes bglA and ascB play a substantial role in the degradation of sinigrin by E. coli O157:H7 strain 02-0304.
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Affiliation(s)
- Roniele P Cordeiro
- Department of Food Science, Faculty of Agriculture and Food Sciences, University of Manitoba, Winnipeg, MB R3T 2N2, Canada
| | - Juan H Doria
- Department of Animal Science, University of Manitoba, Winnipeg, MB R3T 2N2, Canada
| | - George G Zhanel
- Department of Medical Microbiology, Faculty of Medicine, University of Manitoba, Winnipeg, MB R3E 3P5, Canada
| | - Richard Sparling
- Department of Microbiology, Faculty of Science, University of Manitoba, Winnipeg, MB R3T 2N2, Canada
| | - Richard A Holley
- Department of Food Science, Faculty of Agriculture and Food Sciences, University of Manitoba, Winnipeg, MB R3T 2N2, Canada.
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Jahan M, Zhanel GG, Sparling R, Holley RA. Horizontal transfer of antibiotic resistance from Enterococcus faecium of fermented meat origin to clinical isolates of E. faecium and Enterococcus faecalis. Int J Food Microbiol 2015; 199:78-85. [PMID: 25647243 DOI: 10.1016/j.ijfoodmicro.2015.01.013] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2014] [Accepted: 01/14/2015] [Indexed: 10/24/2022]
Abstract
Enterococcus species are part of the normal intestinal flora of a large number of mammals including humans and consequently, they can be used as indicators of faecal contamination in food and water for human consumption. Their presence in large numbers in foods may indicate a lapse in sanitation and their ability to serve as a genetic reservoir of transferable antibiotic resistance is of concern. In the present study, Enterococcus spp., isolated from commercially fermented meat and human clinical specimen were studied to determine genetic relationships. SmaI pulsed-field gel electrophoresis (PFGE) patterns exhibited genomic heterogeneity within and between both groups of isolates. However, in spite of this heterogeneity there were still substantial phenotypic similarities which suggested that food might be a potential vehicle for distribution of resistant bacteria among humans. In vitro conjugation experiments demonstrated transfer of the tetracycline resistant determinant, tet(M), from Enterococcus faecium S27 isolated from fermented sausage to clinical isolates of both E. faecium and Enterococcus faecalis. The streptomycin resistance of E. faecium S27 was also transferred to a clinical strain, E. faecalis 82916, which was confirmed by the presence of the streptomycin resistance gene, aadA, in the donor and transconjugant strains. Since the aadA gene is associated with a class 1 integron, results also suggested that resistance transfer might have occurred via an integron. It appears this is the first identification of a class 1 integron in E. faecium isolated from food. The importance of food enterococci as a reservoir of antibiotic resistance genes and the potential for their genetic transfer to human strains following consumption of uncooked or undercooked contaminated meat is underlined by this work.
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Affiliation(s)
- Musarrat Jahan
- Department of Food Science, University of Manitoba, Winnipeg, MB R3T 2N2, Canada
| | - George G Zhanel
- Department of Medical Microbiology, Faculty of Medicine, University of Manitoba, Winnipeg, MB R3E 3P5, Canada
| | - Richard Sparling
- Department of Microbiology, University of Manitoba, Winnipeg, MB R3T 2N2, Canada
| | - Richard A Holley
- Department of Food Science, University of Manitoba, Winnipeg, MB R3T 2N2, Canada.
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24
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Osaili TM, Al-Nabulsi AA, Jaradat Z, Shaker RR, Alomari DZ, Al-Dabbas MM, Alaboudi AR, Al-Natour MQ, Holley RA. Survival and growth of Salmonella Typhimurium, Escherichia coli O157:H7 and Staphylococcus aureus in eggplant dip during storage. Int J Food Microbiol 2014; 198:37-42. [PMID: 25590259 DOI: 10.1016/j.ijfoodmicro.2014.12.025] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2014] [Revised: 11/27/2014] [Accepted: 12/21/2014] [Indexed: 11/19/2022]
Abstract
Eggplant dip is an internationally popular appetizer, prepared in some instances under uncertain hygienic conditions with inconsistent refrigeration. This study examined the effects of citric acid on the survival of pathogenic microorganisms (Salmonella Typhimurium, Escherichia coli O157:H7 and Staphylococcus aureus) and naturally present organisms (lactic acid bacteria, LAB, aerobic bacteria, APC and yeast and mold, YM) in eggplant dip during storage. Eggplant dip with 0, 0.2, 0.4, 0.6 or 0.8% citric acid was inoculated with S. Typhimurium, E. coli O157:H7 or S. aureus and stored at 4, 10 and 21 °C for ≤15 d. Throughout the study, the survival of the inoculated microorganisms was monitored, and LAB, APC, YM numbers and pH were determined. There was no significant (p>0.05) effect of citric acid on inoculated S. Typhimurium and E. coli O157:H7. Salmonella and E. coli O157:H7 survived >7d with little reduction in viability. Reduction of S. aureus viability increased with citric acid concentration and reached>3.0 log10 CFU/g by 15 d at 4 °C. Citric acid had no effect (p>0.05) on the background YM during storage at 4, 10 and 21 °C or LAB stored at 4 and 10 °C, while at 21 °C, 0.6 and 0.8% citric acid significantly reduced LAB. Citric acid had no effect (p>0.05) on the APC in samples stored at 4 °C but it had significant effects on samples stored at 10 and 21 °C. Work reported showed that the use of citric acid at 0.4-0.8% can inhibit the growth of S. aureus in eggplant dip, but adequate refrigeration is essential to minimize risk from this and other pathogens in this product.
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Affiliation(s)
- Tareq M Osaili
- Department of Nutrition and Food Technology, Jordan University of Science and Technology, Irbid 22110, Jordan.
| | - Anas A Al-Nabulsi
- Department of Nutrition and Food Technology, Jordan University of Science and Technology, Irbid 22110, Jordan
| | - Ziad Jaradat
- Department of Nutrition and Food Technology, Jordan University of Science and Technology, Irbid 22110, Jordan
| | - Reyad R Shaker
- Department of Nutrition and Food Technology, Jordan University of Science and Technology, Irbid 22110, Jordan
| | - Dalia Z Alomari
- Department of Nutrition and Food Technology, Jordan University of Science and Technology, Irbid 22110, Jordan
| | - Maher M Al-Dabbas
- Department of Nutrition and Food Technology, Faculty of Agriculture, The University of Jordan, Amman 11942, Jordan
| | - Akram R Alaboudi
- Department of Veterinary Pathology and Public Health, Faculty of Veterinary Medicine, Jordan University of Science and Technology, Irbid 22110, Jordan
| | - Mohammad Q Al-Natour
- Department of Veterinary Pathology and Public Health, Faculty of Veterinary Medicine, Jordan University of Science and Technology, Irbid 22110, Jordan
| | - Richard A Holley
- Department of Food Science, University of Manitoba, Winnipeg, MB R3T 2N2 Canada
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25
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Abstract
Factors, including pH, temperature, glucose concentration, and iron compounds, affect the activity of plant myrosinase and, consequently, endogenous glucosinolate degradation. These factors also may affect glucosinolate degradation by bacterial myrosinase. Therefore, this study examined the effect of temperature (4 to 21°C), glucose (0.05 to 1.0%), and iron (10 mM ferrous or ferric) on sinigrin degradation by Salmonella or Listeria monocytogenes cocktails in Mueller-Hinton broth and the effect of sinigrin degradation on bacterial viability. The degradation of sinigrin by both pathogens increased with higher temperatures (21 > 10 > 4°C). Salmonella and L. monocytogenes cocktails hydrolyzed 59.1 and 53.2% of sinigrin, respectively, at 21°C up to 21 days. Both iron compounds significantly enhanced sinigrin degradation by the pathogens. On day 7, sinigrin was not detected when the Salmonella cocktail was cultured with ferrous iron or when the L. monocytogenes cocktail was cultured in Mueller-Hinton broth containing ferric iron. In contrast, ferric and ferrous iron inhibited the activity of 0.002 U/ml myrosinase from white mustard by 63 and 35%, respectively, on day 1. Salmonella and L. monocytogenes cocktails were able to degrade >80% of sinigrin at 0.05 and 0.1% glucose; however, 0.25 to 1.0% glucose significantly reduced sinigrin degradation. Although both pathogens significantly degraded sinigrin, the allyl isothiocyanate (AITC) recoverable was ≤6.2 ppm, which is not inhibitory to Salmonella or L. monocytogenes. It is probable that the gradual hydrolysis of sinigrin to form AITC either did not produce an inhibitory level of AITC or the AITC formed was unstable in the aqueous medium and rapidly decomposed to new compounds that were less bactericidal against the pathogens.
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Affiliation(s)
- Amin N Olaimat
- Department of Food Science, Faculty of Agriculture and Food Science, University of Manitoba, Winnipeg, Manitoba, Canada R3T 2N2
| | - Babak Sobhi
- Department of Food Science, Faculty of Agriculture and Food Science, University of Manitoba, Winnipeg, Manitoba, Canada R3T 2N2
| | - Richard A Holley
- Department of Food Science, Faculty of Agriculture and Food Science, University of Manitoba, Winnipeg, Manitoba, Canada R3T 2N2.
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26
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Al-Nabulsi AA, Osaili TM, Awad AA, Olaimat AN, Shaker RR, Holley RA. Occurrence and antibiotic susceptibility ofListeria monocytogenesisolated from raw and processed meat products in Amman, Jordan. CyTA - Journal of Food 2014. [DOI: 10.1080/19476337.2014.982191] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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27
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Mehyar GF, Al-Ismail KM, Al-Isamil KM, Al-Ghizzawi HM, Holley RA. Stability of cardamom (Elettaria cardamomum) essential oil in microcapsules made of whey protein isolate, guar gum, and carrageenan. J Food Sci 2014; 79:C1939-49. [PMID: 25224989 DOI: 10.1111/1750-3841.12652] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2014] [Accepted: 08/13/2014] [Indexed: 11/27/2022]
Abstract
UNLABELLED The effects of microencapsulating cardamom essential oil (CEO) in whey protein isolate (WPI) alone and combined with guar gum (GG) and carrageen (CG) on microencapsulation efficiency, oil chemical stability, and microcapsule structure were investigated. Freeze-dried microcapsules were prepared from emulsions containing (w/w): 15% and 30% WPI; 0.1% GG, and 0.2% CG as wall materials with CEO (at 10% of polymer concentration) as core material, and physical properties and chemical stability were compared. Bulk density of microcapsules was highest in WPI without GG or CG and in 30% WPI + GG microcapsules, and was more affected by moisture content (r = -0.6) than by mean particle diameter (d43 ; r = -0.2) and span (r = 0.1). Microcapsules containing only WPI had the highest entrapped oil (7.5%) and microencapsulation efficiency (98.5%). The concentrations of 1,8-cineole and d-limonene were used as indicators for microcapsule chemical stability since they were the main components of CEO. Microcapsules retained higher (P ≤ 0.05) concentrations of both components than non-microencapsulated CEO during 16 wk storage at 20 ºC, but higher loss of both components was noted at 35 ºC. Microencapsulated d-limonene was reduced faster than 1,8-cineole regardless of temperature. The 30% WPI and 30% WPI + GG microcapsules retained CEO best throughout storage at both storage temperatures. Scanning electron micrographs revealed that WPI microcapsules had smooth surfaces, were relatively homogenous and regular in shape, whereas GG and CG addition increased visual surface porosity and reduced shape regularity. It was concluded that the best formulation for encapsulating CEO was 30% WPI. PRACTICAL APPLICATION Encapsulating cardamom essential oil in whey protein isolate alone or combined with guar gum produced dried powders that effectively retained and chemically stabilized CEO, and therefore enhanced its handling and storability.
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Affiliation(s)
- Ghadeer F Mehyar
- Dept. of Nutrition and Food Technology, Faculty of Agriculture, The Univ. of Jordan, Amman, Jordan
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28
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Al-Nabulsi AA, Olaimat AN, Osaili TM, Shaker RR, Zein Elabedeen N, Jaradat ZW, Abushelaibi A, Holley RA. Use of acetic and citric acids to control Salmonella Typhimurium in tahini (sesame paste). Food Microbiol 2014; 42:102-8. [DOI: 10.1016/j.fm.2014.02.020] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2013] [Revised: 01/21/2014] [Accepted: 02/25/2014] [Indexed: 10/25/2022]
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29
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Osaili TM, Al-Nabulsi AA, Olaimat AN, Shaker RR, Taha M, Holley RA. Survival ofEscherichia coliO157:H7 during Manufacture and Storage of White Brined Cheese. J Food Sci 2014; 79:M1750-5. [DOI: 10.1111/1750-3841.12547] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2014] [Accepted: 05/30/2014] [Indexed: 11/27/2022]
Affiliation(s)
- Tareq M. Osaili
- Dept. of Nutrition and Food Technology; Faculty of Agriculture; Jordan Univ. of Science and Technology; P.O. Box (3030) Irbid 22110 Jordan
| | - Anas A. Al-Nabulsi
- Dept. of Nutrition and Food Technology; Faculty of Agriculture; Jordan Univ. of Science and Technology; P.O. Box (3030) Irbid 22110 Jordan
| | - Amin N. Olaimat
- Dept. of Food Science; Faculty of Agriculture and Food Science; Univ. of Manitoba; Winnipeg R3T 2N2 Canada
| | - Reyad R. Shaker
- Dept. of Nutrition and Food Technology; Faculty of Agriculture; Jordan Univ. of Science and Technology; P.O. Box (3030) Irbid 22110 Jordan
| | - Mohammad Taha
- Dept. of Nutrition and Food Technology; Faculty of Agriculture; Jordan Univ. of Science and Technology; P.O. Box (3030) Irbid 22110 Jordan
| | - Richard A. Holley
- Dept. of Food Science; Faculty of Agriculture and Food Science; Univ. of Manitoba; Winnipeg R3T 2N2 Canada
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30
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Li S, Kundu D, Holley RA. Use of lactic acid with electron beam irradiation for control of Escherichia coli O157:H7, non-O157 VTEC E. coli, and Salmonella serovars on fresh and frozen beef. Food Microbiol 2014; 46:34-39. [PMID: 25475263 DOI: 10.1016/j.fm.2014.06.018] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2014] [Revised: 06/13/2014] [Accepted: 06/18/2014] [Indexed: 11/28/2022]
Abstract
Lactic acid pre-treatment was examined to enhance the antimicrobial action of electron (e-) beam irradiation of beef trim. Meat samples were inoculated with Escherichia coli O157:H7, non-O157 VTEC E. coli or Salmonella cocktails and treated with 5% lactic acid at 55 °C. Samples were packaged aerobically or vacuum-packed, kept at 4 °C and treated with 1 kGy e-beam energy. Frozen samples were treated with 1, 3 or 7 kGy and stored at -20 °C for ≤ 5 d. Lactic acid enhanced the antimicrobial action of 1 kGy e-beam treatment against Salmonella by causing an additional <1.8 log CFU/g reduction. One kGy treatment of refrigerated samples reduced VTEC E. coli viability by 4.5 log CFU/g, and while lactic acid did not improve the reduction, after freezing additive effects were found. After 3 kGy irradiation, Salmonella was reduced by 2 and 4 log CFU/g in the irradiated and lactic acid plus irradiated samples, respectively. Lactic acid pre-treatment was of limited value with 1 kGy treatment for improving control of toxigenic E. coli in fresh beef trim, however, it would be useful with low dose irradiation for controlling both VTEC E. coli and Salmonella in frozen product.
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Affiliation(s)
- Shuliu Li
- Department of Food Science, University of Manitoba, Faculty of Agricultural and Food Sciences, University of Manitoba, Winnipeg, Manitoba, R3T 2N2 Canada
| | - Devapriya Kundu
- Department of Food Science, University of Manitoba, Faculty of Agricultural and Food Sciences, University of Manitoba, Winnipeg, Manitoba, R3T 2N2 Canada
| | - Richard A Holley
- Department of Food Science, University of Manitoba, Faculty of Agricultural and Food Sciences, University of Manitoba, Winnipeg, Manitoba, R3T 2N2 Canada.
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31
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Affiliation(s)
- Ghadeer F. Mehyar
- Department of Nutrition and Food Technology; Faculty of Agriculture; The University of Jordan; Queen Rania Street, 11942 Amman Jordan
| | - Najib M. El Assi
- Department of Horticulture and Crop Science; Faculty of Agriculture; The University of Jordan; Queen Rania Street, 11942 Amman Jordan
| | - Nihad G. Alsmairat
- Department of Horticulture and Crop Science; Faculty of Agriculture; The University of Jordan; Queen Rania Street, 11942 Amman Jordan
| | - Richard A. Holley
- Department of Food Science; 250 Ellis Building, 13 Freedman Crescent, University of Manitoba; Winnipeg MB R3T 2N2 Canada
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32
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Olaimat AN, Holley RA. Inhibition ofListeria monocytogenesandSalmonellaby Combinations of Oriental Mustard, Malic Acid, and EDTA. J Food Sci 2014; 79:M614-21. [DOI: 10.1111/1750-3841.12411] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2013] [Accepted: 01/23/2014] [Indexed: 11/30/2022]
Affiliation(s)
- Amin N. Olaimat
- Dept. of Food Science; Faculty of Agriculture and Food Science; Univ. of Manitoba; Winnipeg MB R3T 2N2 Canada
| | - Richard A. Holley
- Dept. of Food Science; Faculty of Agriculture and Food Science; Univ. of Manitoba; Winnipeg MB R3T 2N2 Canada
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33
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Al-Nabulsi AA, Osaili TM, Obaidat HM, Shaker RR, Awaisheh SS, Holley RA. Inactivation of stressed Escherichia coli O157:H7 cells on the surfaces of rocket salad leaves by chlorine and peroxyacetic acid. J Food Prot 2014; 77:32-9. [PMID: 24405996 DOI: 10.4315/0362-028x.jfp-13-019] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Because Escherichia coli O157:H7 has been frequently associated with many foodborne outbreaks caused by consumption of leafy greens (lettuce, spinach, and celery), this study investigated the ability of deionized water, chlorine, and peroxyacetic acid to detach or inactivate stressed and unstressed cells of E. coli O157:H7 contaminating the surfaces of rocket salad leaves. E. coli O157:H7 cells stressed by acid, cold, starvation, or NaCl exposure, as well as unstressed cells, were inoculated on the surfaces of rocket salad leaves at 4°C. The effectiveness of two sanitizers (200 ppm of chlorine and 80 ppm of peroxyacetic acid) and deionized water for decontaminating the leaves treated with stressed and unstressed E. coli O157:H7 were evaluated during storage at 10 or 25°C for 0.5, 1, 3, and 7 days. It was found that washing with 80 ppm of peroxyacetic acid was more effective and reduced unstressed and stressed cells of E. coli O157:H7 by about 1 log CFU per leaf on the leaves. There was no apparent difference in the ability of stressed and unstressed cells to survive surface disinfection with the tested agents. Treatments to reduce viable E. coli O157:H7 cells on rocket leaves stored at 25°C were more effective than when used on those stored at 10°C. Washing with peroxyacetic acid or chlorine solution did not ensure the safety of rocket leaves, but such treatments could reduce the likelihood of water-mediated transfer of E. coli O157:H7 during washing and subsequent processing.
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Affiliation(s)
- Anas A Al-Nabulsi
- Department of Nutrition and Food Technology, Jordan University of Science and Technology, Irbid 22110, Jordan
| | - Tareq M Osaili
- Department of Nutrition and Food Technology, Jordan University of Science and Technology, Irbid 22110, Jordan
| | - Heba M Obaidat
- Department of Nutrition and Food Technology, Jordan University of Science and Technology, Irbid 22110, Jordan
| | - Reyad R Shaker
- Department of Nutrition and Food Technology, Jordan University of Science and Technology, Irbid 22110, Jordan
| | - Saddam S Awaisheh
- Department of Nutrition and Food Technology, Al-Balqa Applied University, Al-Salt 19117, Jordan
| | - Richard A Holley
- Department of Food Science, University of Manitoba, Winnipeg, Manitoba, Canada R3T 2N2
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34
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Olaimat AN, Holley RA. Effects of changes in pH and temperature on the inhibition of Salmonella and Listeria monocytogenes by Allyl isothiocyanate. Food Control 2013. [DOI: 10.1016/j.foodcont.2013.05.014] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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35
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Jahan M, Holley RA. Incidence of virulence factors in enterococci from raw and fermented meat and biofilm forming capacity at 25°C and 37°C. Int J Food Microbiol 2013; 170:65-9. [PMID: 24291183 DOI: 10.1016/j.ijfoodmicro.2013.11.002] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2013] [Revised: 10/29/2013] [Accepted: 11/03/2013] [Indexed: 11/16/2022]
Abstract
Twenty-nine Enterococcus strains from raw and fermented meat products were screened for the presence of virulence genes, including those for aggregation substances (asa1 and asa373), cytolysin activator (cylA), collagen binding protein (ace), endocarditis antigen (efaA), enterococcal surface protein (esp) and gelatinase (gelE). Virulence gene occurrence, expression of gelatinase and pheromone aggregation was greater in Enterococcus faecalis than in Enterococcus faecium strains. All E. faecalis and 54% of E. faecium were positive for at least one or more virulence gene. The only strain of Enterococcus gallinarum tested also contained virulence genes. The effect of different growth temperatures (25 and 37°C) on biofilm formation using polystyrene plates was also assessed. Strong biofilm formation occurred at lower than optimum temperature in all three species of enterococci. Neither esp nor gelE was necessary for biofilm formation and this relationship was species rather than strain specific. This study emphasizes the importance of enterococci as a reservoir of virulence genes and the potential for their genetic transfer to human strains following consumption of uncooked or undercooked contaminated meat.
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Affiliation(s)
- Musarrat Jahan
- Department of Food Science, University of Manitoba, Winnipeg, Manitoba R3T 2N2, Canada
| | - Richard A Holley
- Department of Food Science, University of Manitoba, Winnipeg, Manitoba R3T 2N2, Canada.
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36
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Li S, Aliani M, Holley RA. Sensory Evaluation of Dry-fermented Sausage Containing Ground Deodorized Yellow Mustard. J Food Sci 2013; 78:S1595-S1601. [DOI: 10.1111/1750-3841.12252] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2012] [Accepted: 07/31/2013] [Indexed: 11/28/2022]
Affiliation(s)
- Shuliu Li
- Dept. of Food Science, Faculty of Agriculture and Food Sciences; Univ. of Manitoba, Winnipeg, Manitoba R3T 2N2; Canada
| | - Michel Aliani
- Dept. of Human Nutritional Sciences; Univ. of Manitoba, Winnipeg, Manitoba R3T 2N2; Canada
| | - Richard A. Holley
- Dept. of Food Science, Faculty of Agriculture and Food Sciences; Univ. of Manitoba, Winnipeg, Manitoba R3T 2N2; Canada
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37
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Osaili TM, Taani M, Al-Nabulsi AA, Attlee A, Odeh RA, Holley RA, Obaid RS. Survival of Escherichia coli
O157:H7 during the Manufacture and Storage of Fruit Yogurt. J Food Saf 2013. [DOI: 10.1111/jfs.12051] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Affiliation(s)
- Tareq M. Osaili
- Department of Nutrition and Food Technology; Jordan University of Science and Technology; Irbid 22110 Jordan
| | - Mahmoud Taani
- Department of Nutrition and Food Technology; Jordan University of Science and Technology; Irbid 22110 Jordan
| | - Anas A. Al-Nabulsi
- Department of Nutrition and Food Technology; Jordan University of Science and Technology; Irbid 22110 Jordan
| | - Amita Attlee
- Department of Clinical Nutrition and Dietetics; College of Health Sciences, University of Sharjah; Sharjah UAE
| | - Ra'ed Abu Odeh
- Department of Medical Laboratory Sciences; University of Sharjah; Sharjah UAE
| | - Richard A. Holley
- Department of Food Science; University of Manitoba; Winnipeg Manitoba Canada
| | - Reyad Shaker Obaid
- Department of Nutrition and Food Technology; Jordan University of Science and Technology; Irbid 22110 Jordan
- Department of Clinical Nutrition and Dietetics; College of Health Sciences, University of Sharjah; Sharjah UAE
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39
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Jahan M, Krause DO, Holley RA. Antimicrobial resistance of Enterococcus species from meat and fermented meat products isolated by a PCR-based rapid screening method. Int J Food Microbiol 2013; 163:89-95. [PMID: 23558191 DOI: 10.1016/j.ijfoodmicro.2013.02.017] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2012] [Revised: 01/22/2013] [Accepted: 02/18/2013] [Indexed: 11/25/2022]
Abstract
Enterococci are predominantly found in the gastrointestinal tract of humans and animals, but species commonly resident on vegetation are known. Their presence in large numbers in foods may indicate a lapse in sanitation and their ability to serve as a genetic reservoir of transferable antibiotic resistance is of concern. Conventional culture methods for identification of enterococci are slow and sometimes give false results because of the biochemical diversity of the organisms in this genus. This work reports the development of a PCR-based assay to detect enterococci at the genus level by targeting a 16S rRNA sequence. Published 16S rRNA sequences were aligned and used to design genus specific primers (EntF and EntR). The primers were able to amplify a 678 bp target region from Enterococcus faecalis ATCC 7080 and 20 other strains of enterococci from 11 different species, but there was no amplification by 32 species from closely related genera (Pediococcus, Lactobacillus, Streptococcus and Listeria) or species of Escherichia coli and Salmonella. The PCR positive samples were plated, screened by a colony patch technique and their identities were confirmed by API 20 Strep panels and sequencing. When dry fermented sausage and ham as well as fresh meat batter for dry cured sausage manufacture were tested for enterococci by the method, 29 Enterococcus strains (15 E. faecalis, 13 E. faecium, and one E. gallinarum) were identified. When susceptibility of these enterococci to 12 antibiotics was tested, the highest incidence of resistance was to clindamycin (89.6%), followed by tetracycline hydrochloride (65.5%), tylosin (62%), erythromycin (45%), streptomycin and neomycin (17%), chloramphenicol (10.3%), penicillin (10.3%), ciprofloxacin (10.3%) and gentamicin (3.4%). None was resistant to the clinically important drugs vancomycin or ampicillin. Most strains (27/29) were resistant to more than one antibiotic while 17 of 29 strains were resistant to three to 8 antibiotics. The molecular method developed was validated for speciation of enterococci and was useful in assessing uncooked processed meat products as a reservoir for multi-drug resistant Enterococcus species.
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Affiliation(s)
- Musarrat Jahan
- Department of Food Science, University of Manitoba, Winnipeg, Manitoba R3T 2N2, Canada
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40
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Visvalingam J, Hernandez-Doria JD, Holley RA. Examination of the genome-wide transcriptional response of Escherichia coli O157:H7 to cinnamaldehyde exposure. Appl Environ Microbiol 2013; 79:942-50. [PMID: 23183978 PMCID: PMC3568558 DOI: 10.1128/aem.02767-12] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2012] [Accepted: 11/20/2012] [Indexed: 02/06/2023] Open
Abstract
Cinnamaldehyde is a natural antimicrobial that has been found to be effective against many food-borne pathogens, including Escherichia coli O157:H7. Although its antimicrobial effects have been well investigated, limited information is available on its effects at the molecular level. Sublethal treatment at 200 mg/liter cinnamaldehyde inhibited growth of E. coli O157:H7 at 37°C and for ≤2 h caused cell elongation, but from 2 to 4 h growth resumed and cells reverted to normal length. To understand this transient behavior, genome-wide transcriptional analysis of E. coli O157:H7 was performed at 2 and 4 h of exposure to cinnamaldehyde in conjunction with reverse-phase high-performance liquid chromatography (RP-HPLC) analysis for cinnamaldehyde and other cinnamic compounds. Drastically different gene expression profiles were obtained at 2 and 4 h. RP-HPLC analysis showed that cinnamaldehyde was structurally stable for at least 2 h. At 2 h of exposure, cinnamaldehyde induced expression of many oxidative stress-related genes and repressed expression of DNA, protein, O-antigen, and fimbrial synthetic genes. At 4 h, many cinnamaldehyde-induced repressive effects on E. coli O157:H7 gene expression were reversed, and cells became more motile and grew at a slightly higher rate. Data indicated that by 4 h, E. coli O157:H7 was able to convert cinnamaldehyde into the less toxic cinnamic alcohol using dehydrogenase/reductase enzymes (YqhD and DkgA). This is the first study to characterize the ability of E. coli O157:H7 to convert cinnamaldehyde into cinnamic alcohol which, in turn, showed that the antimicrobial activity of cinnamaldehyde is mainly attributable to its carbonyl aldehyde group.
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Affiliation(s)
| | | | - Richard A. Holley
- Department of Food Science, University of Manitoba, Winnipeg, Manitoba, Canada
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Olaimat AN, Holley RA. Factors influencing the microbial safety of fresh produce: A review. Food Microbiol 2012; 32:1-19. [DOI: 10.1016/j.fm.2012.04.016] [Citation(s) in RCA: 582] [Impact Index Per Article: 48.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2011] [Revised: 02/22/2012] [Accepted: 04/26/2012] [Indexed: 11/25/2022]
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Sun XD, Holley RA. Antimicrobial and Antioxidative Strategies to Reduce Pathogens and Extend the Shelf Life of Fresh Red Meats. Compr Rev Food Sci Food Saf 2012. [DOI: 10.1111/j.1541-4337.2012.00188.x] [Citation(s) in RCA: 55] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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43
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Nilson AM, Holley RA. Use of deodorized yellow mustard powder to control Escherichia coli O157:H7 in dry cured Westphalian ham. Food Microbiol 2012; 30:400-7. [DOI: 10.1016/j.fm.2011.10.016] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2011] [Revised: 10/11/2011] [Accepted: 10/27/2011] [Indexed: 11/28/2022]
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Lara-Lledó M, Olaimat A, Holley RA. Inhibition of Listeria monocytogenes on bologna sausages by an antimicrobial film containing mustard extract or sinigrin. Int J Food Microbiol 2012; 156:25-31. [PMID: 22424932 DOI: 10.1016/j.ijfoodmicro.2012.02.018] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2011] [Revised: 02/17/2012] [Accepted: 02/23/2012] [Indexed: 11/18/2022]
Abstract
The ability of Listeria (L.) monocytogenes to convert glucosinolates into antimicrobial isothiocyanates was investigated. Mustard glucosinolates in pure (sinigrin) or extract forms (sinigrin, oriental; sinalbin, yellow mustard) were used in broth media and in a polyvinyl polyethylene glycol graft copolymer (PPG) packaging film with bologna to examine their value as antimicrobial precursors for the control of L. monocytogenes viability and extension of bologna shelf-life at 4 °C. During broth tests with deodorized (myrosinase-inactivated) mustard extracts (10 d at 20 °C) or with purified sinigrin (21 d at 20 °C) L. monocytogenes was only inhibited when exogenous myrosinase was added. None the less, the organism was able to hydrolyze almost half the pure sinigrin by 21 d in tests without added enzyme. Reductions in sinigrin levels were measured by reversed-phase liquid chromatography, and in the absence of L. monocytogenes or added myrosinase the glucosinolate was stable. When pure sinigrin, oriental or yellow mustard extracts were incorporated in PPG films containing 3, 5 and 6% (w/w) of the corresponding glucosinolate and used to package bologna inoculated with 4 log CFU/g L. monocytogenes, the pathogen became undetectable in bologna packed with the oriental mustard extract at 52 d storage and remained undetectable at 70 d. The yellow mustard extract was less inhibitory and the pure sinigrin was not antimicrobial. L. monocytogenes numbers reached >7 log CFU/g in the film and untreated controls at 17 d storage. At 35 d storage, samples packed with control film contained sufficient numbers of lactic acid bacteria (LAB) (>7 log CFU/g) to be considered spoiled, whereas treatments containing mustard or sinigrin remained <7 log CFU/g LAB for ≤ 70 d. L. monocytogenes played a key role in exerting control over its own viability in bologna by hydrolysis of the glucosinolate in the oriental mustard film, but other antimicrobials in treatments may have contributed.
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Affiliation(s)
- Marta Lara-Lledó
- Materials and Packaging System Department, Packaging, Transport & Logistics Research Centre-ITENE, 46980 Paterna-Valencia, Spain
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Visvalingam J, Gill CO, Holley RA. The viabilities of cells in cultures of Escherichia coli growing with formation of filaments at 6°C. Int J Food Microbiol 2012; 153:129-34. [DOI: 10.1016/j.ijfoodmicro.2011.10.027] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2011] [Revised: 09/28/2011] [Accepted: 10/30/2011] [Indexed: 10/15/2022]
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Al-Nabulsi AA, Osaili TM, Elabedeen NAZ, Jaradat ZW, Shaker RR, Kheirallah KA, Tarazi YH, Holley RA. Impact of environmental stress desiccation, acidity, alkalinity, heat or cold on antibiotic susceptibility of Cronobacter sakazakii. Int J Food Microbiol 2011; 146:137-43. [DOI: 10.1016/j.ijfoodmicro.2011.02.013] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2010] [Revised: 02/02/2011] [Accepted: 02/11/2011] [Indexed: 10/18/2022]
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Zhang G, Mathis GF, Hofacre CL, Yaghmaee P, Holley RA, Durance TD. Effect of a Radiant Energy–Treated Lysozyme Antimicrobial Blend on the Control of Clostridial Necrotic Enteritis in Broiler Chickens. Avian Dis 2010; 54:1298-300. [DOI: 10.1637/9370-041410-resnote.1] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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50
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Al-Nabulsi AA, Osaili TM, Shaker RR, Olaimat AN, Ayyash MM, Holley RA. Survival of Cronobacter species in reconstituted herbal infant teas and their sensitivity to bovine lactoferrin. J Food Sci 2010; 74:M479-84. [PMID: 20492118 DOI: 10.1111/j.1750-3841.2009.01371.x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Cronobacter is a new genus containing 5 species previously known as Enterobacter sakazakii. The popularity of "natural" substances and alternative medicine has extended the use of natural antimicrobials and herbs to foods, and some herbs are claimed to relieve gastric disturbances in infants. The present study investigated the antimicrobial activity of bovine lactoferrin (LF) and Cronobacter survival in commercial herbal infant teas (HITs) reconstituted with water at different temperatures. Cronobacter cells were able to grow in all reconstituted HITs at 37 or 21 degrees C after 6 h. A 4-log reduction in Cronobacter was achieved by reconstituting herbal infant tea at > or = 60 degrees C. LF was able to reduce Cronobacter species viability in herbal infant tea. No viable cells were recovered after 4 h at 37 degrees C in the presence of > or = 5 mg LF/mL. The bactericidal activity of LF was reduced at lower concentrations and lower temperatures. This study demonstrates that if present in reconstituted herbal infant tea, Cronobacter can grow and this may compromise the safety of these products. Therefore, addition of LF to reconstituted HIT may be a promising approach for the effective control of this organism. Practical Application: Cronobacter species can be isolated from herbal teas, and these products are claimed to relieve gastric disturbances in infants. This study demonstrates that Cronobacter cells present in reconstituted herbal infant teas (HITs) can grow if not held at acceptable temperatures. It was shown that reconstitution of these tea formulas with > or = 60 degrees C water reduced the potential risk from Cronobacter. Furthermore, use of lactoferrin (LF) may be a promising approach for effective control of these organisms in HIT held at nonrefrigeration temperatures (10 to 37 degrees C) for short periods.
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Affiliation(s)
- Anas A Al-Nabulsi
- Dept. of Nutrition and Food Technology, Faculty of Agriculture, Jordan Univ. of Science and Technology, P.O. Box 3030, Irbid 22110, Jordan.
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