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Topalcengiz Z, Chandran S, Gibson KE. A comprehensive examination of microbial hazards and risks during indoor soilless leafy green production. Int J Food Microbiol 2024; 411:110546. [PMID: 38157635 DOI: 10.1016/j.ijfoodmicro.2023.110546] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2023] [Revised: 10/26/2023] [Accepted: 12/16/2023] [Indexed: 01/03/2024]
Abstract
Produce grown under controlled environment agriculture (CEA) is often assumed to have a reduced risk of pathogen contamination due to the low chance of exposure to outdoor contaminant factors. However, the 2021 outbreak and numerous recalls of CEA-grown lettuce and microgreens demonstrate the possibility of pathogen introduction during indoor production when there is a failure in the implementation of food safety management systems. Indoor production of commercial leafy greens, such as lettuce and microgreens, is performed across a range of protective structures from primitive household setups to advanced and partially automatized growing systems. Indoor production systems include hydroponic, aquaponic, and aeroponic configurations. Hydroponic systems such as deep water culture and nutrient film technique comprised of various engineering designs represent the main system types used by growers. Depending on the type of leafy green, the soilless substrate, and system selection, risk of microbial contamination will vary during indoor production. In this literature review, science-based pathogen contamination risks and mitigation strategies for indoor production of microgreens and more mature leafy greens are discussed during both pre-harvest and post-harvest stages of production.
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Affiliation(s)
- Zeynal Topalcengiz
- Department of Food Science, Center for Food Safety, University of Arkansas System Division of Agriculture, Fayetteville, AR 72704, USA; Department of Food Engineering, Faculty of Engineering and Architecture, Muş Alparslan University, 49250 Muş, Türkiye
| | - Sahaana Chandran
- Department of Food Science, Center for Food Safety, University of Arkansas System Division of Agriculture, Fayetteville, AR 72704, USA
| | - Kristen E Gibson
- Department of Food Science, Center for Food Safety, University of Arkansas System Division of Agriculture, Fayetteville, AR 72704, USA.
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Koutsoumanis K, Ordóñez AA, Bolton D, Bover‐Cid S, Chemaly M, De Cesare A, Herman L, Hilbert F, Lindqvist R, Nauta M, Nonno R, Peixe L, Ru G, Simmons M, Skandamis P, Suffredini E, Banach J, Ottoson J, Zhou B, da Silva Felício MT, Jacxsens L, Martins JL, Messens W, Allende A. Microbiological hazards associated with the use of water in the post-harvest handling and processing operations of fresh and frozen fruits, vegetables and herbs (ffFVHs). Part 1 (outbreak data analysis, literature review and stakeholder questionnaire). EFSA J 2023; 21:e08332. [PMID: 37928944 PMCID: PMC10623241 DOI: 10.2903/j.efsa.2023.8332] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2023] Open
Abstract
The contamination of water used in post-harvest handling and processing operations of fresh and frozen fruit, vegetables and herbs (ffFVHs) is a global concern. The most relevant microbial hazards associated with this water are: Listeria monocytogenes, Salmonella spp., human pathogenic Escherichia coli and enteric viruses, which have been linked to multiple outbreaks associated with ffFVHs in the European Union (EU). Contamination (i.e. the accumulation of microbiological hazards) of the process water during post-harvest handling and processing operations is affected by several factors including: the type and contamination of the FVHs being processed, duration of the operation and transfer of microorganisms from the product to the water and vice versa, etc. For food business operators (FBOp), it is important to maintain the microbiological quality of the process water to assure the safety of ffFVHs. Good manufacturing practices (GMP) and good hygienic practices (GHP) related to a water management plan and the implementation of a water management system are critical to maintain the microbiological quality of the process water. Identified hygienic practices include technical maintenance of infrastructure, training of staff and cooling of post-harvest process water. Intervention strategies (e.g. use of water disinfection treatments and water replenishment) have been suggested to maintain the microbiological quality of process water. Chlorine-based disinfectants and peroxyacetic acid have been reported as common water disinfection treatments. However, given current practices in the EU, evidence of their efficacy under industrial conditions is only available for chlorine-based disinfectants. The use of water disinfection treatments must be undertaken following an appropriate water management strategy including validation, operational monitoring and verification. During operational monitoring, real-time information on process parameters related to the process and product, as well as the water and water disinfection treatment(s) are necessary. More specific guidance for FBOp on the validation, operational monitoring and verification is needed.
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Padovani NFA, Santos TS, Almeida P, Dias M, Mendes MA, Cesar ASM, Maffei DF. Salmonella and other Enterobacteriaceae in conventional and organic vegetables grown in Brazilian farms. Braz J Microbiol 2023; 54:1055-1064. [PMID: 36811768 PMCID: PMC10235262 DOI: 10.1007/s42770-023-00934-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2022] [Accepted: 02/13/2023] [Indexed: 02/24/2023] Open
Abstract
This study aimed to assess the microbiological profile of conventional and organic vegetables grown in Brazilian farms through the detection of Salmonella and other Enterobacteriaceae. A total of 200 samples (100 conventional and 100 organic), including leafy greens, spices/herbs, and other unusual vegetables, were submitted to the enumeration of Enterobacteriaceae by plating on VRBG agar. Moreover, colonies of Enterobacteriaceae were randomly selected and submitted to identification by MALDI-TOF MS. Samples were also tested for Salmonella, using culture-based and PCR-based enrichment methods. The mean counts of Enterobacteriaceae in conventional and organic vegetables were 5.1 ± 1.5 and 5.4 ± 1.4 log CFU/g, respectively (P > 0.05). A total of 18 genera (including 38 species) of Enterobacteriaceae were identified, and the most frequent ones found in samples from both farming systems were Enterobacter (76%) and Pantoea (68%). Salmonella was identified in 17 samples (8.5%): nine (4.5%) in conventional and eight (4.0%) in organic vegetables. These results indicate that the farming system had no impact on the Enterobacteriaceae populations and rates of Salmonella and revealed unsatisfactory microbiological safety of some samples, mainly due to the presence of Salmonella. These findings highlight the need for control measures during vegetable production, regardless of the farming system, to reduce microbial contamination and the risks of foodborne illnesses.
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Affiliation(s)
- Nicolle F A Padovani
- Department of Agri-Food Industry, Food and Nutrition, Luiz de Queiroz" College of Agriculture, University of Sao Paulo, Av. Pádua Dias, 11, Piracicaba, SP, CP9, 13418-900, Brazil
| | - Thiago S Santos
- Department of Agri-Food Industry, Food and Nutrition, Luiz de Queiroz" College of Agriculture, University of Sao Paulo, Av. Pádua Dias, 11, Piracicaba, SP, CP9, 13418-900, Brazil
| | - Priscila Almeida
- Department of Agri-Food Industry, Food and Nutrition, Luiz de Queiroz" College of Agriculture, University of Sao Paulo, Av. Pádua Dias, 11, Piracicaba, SP, CP9, 13418-900, Brazil
| | - Meriellen Dias
- Dempster MS Lab, Department of Chemical Engineering, Polytechnic School, University of Sao Paulo, Sao Paulo, SP, Brazil
| | - Maria Anita Mendes
- Dempster MS Lab, Department of Chemical Engineering, Polytechnic School, University of Sao Paulo, Sao Paulo, SP, Brazil
| | - Aline S M Cesar
- Department of Agri-Food Industry, Food and Nutrition, Luiz de Queiroz" College of Agriculture, University of Sao Paulo, Av. Pádua Dias, 11, Piracicaba, SP, CP9, 13418-900, Brazil
| | - Daniele F Maffei
- Department of Agri-Food Industry, Food and Nutrition, Luiz de Queiroz" College of Agriculture, University of Sao Paulo, Av. Pádua Dias, 11, Piracicaba, SP, CP9, 13418-900, Brazil.
- Food Research Center (FoRC-CEPID), Sao Paulo, SP, Brazil.
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Lucas JR, Ramos D, Balcázar SS, Santos C. The Presence of Potentially Pathogenic Protozoa in Lettuce ( Lactuca sativa) Sold in Markets in the Central Peruvian Andes. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2023; 20:943. [PMID: 36673697 PMCID: PMC9858690 DOI: 10.3390/ijerph20020943] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/01/2022] [Revised: 11/22/2022] [Accepted: 11/28/2022] [Indexed: 06/17/2023]
Abstract
Peru is currently one of the world’s leading culinary destinations, whose world-renowned cuisine uses vegetables, mainly lettuce, as frequent ingredients. Vegetable consumption is promoted worldwide as a part of a healthy diet. However, vegetables, more frequently lettuce, have been implicated as a vehicle of infection for several foodborne parasites. This study aimed to determine the presence of potentially pathogenic parasites in lettuce marketed in the Central Andes of Peru. A total of 75 lettuce samples were collected from the two largest wholesale markets and the main open-air market in Jauja province, in the central Peruvian Andes. The province of provenance (coast vs. highlands), lettuce variety (“curly-leaf”, “iceberg”, and “butter”), and type of market were recorded. The samples were microscopically examined for detection of parasitic life forms using standard parasitological methods including direct slide smear, Lugol’s iodine staining, and Modified Ziehl−Neelsen staining. The overall positivity of parasitic contamination in lettuces was 45.3% (CI 95%: 34−56.6%). Cryptosporidium spp., Isospora belli, Giardia lamblia, Balantidium coli, and Entamoeba spp. were detected in twenty-six (34.7%), six (8%), four (5.3%), two (2.7%), and two (2.7%) lettuces, respectively. I. belli was found in a significantly (p < 0.01) lower proportion in the “butter” variety, and significantly (p < 0.05) higher contamination with G. lamblia was found in lettuce sold at the open-air market. B. coli, G. lamblia, and E. histolytica/E. dispar/E. moshkovskii were detected only in lettuce from the highlands (Tarma province). This study provides important data for health authorities to develop food safety programs. This information is also of interest to the international community because of the increased visibility that Peru has gained as a tourist destination.
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Affiliation(s)
- J. Raul Lucas
- Department of Animal Health and Public Health, Veterinary Medicine Faculty, Universidad Nacional Mayor de San Marcos, San Borja, Lima 15021, Peru
| | - Daphne Ramos
- Department of Animal Health and Public Health, Veterinary Medicine Faculty, Universidad Nacional Mayor de San Marcos, San Borja, Lima 15021, Peru
| | - S. Sonia Balcázar
- Department of Animal Health and Public Health, Veterinary Medicine Faculty, Universidad Nacional Mayor de San Marcos, San Borja, Lima 15021, Peru
| | - Carlos Santos
- Department Section of Food Technology, Veterinary Faculty, Complutense University, 28040 Madrid, Spain
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Srisamran J, Atwill ER, Chuanchuen R, Jeamsripong S. Detection and analysis of indicator and pathogenic bacteria in conventional and organic fruits and vegetables sold in retail markets. FOOD QUALITY AND SAFETY 2022. [DOI: 10.1093/fqsafe/fyac013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Abstract
Produce-associated foodborne outbreaks have been increasingly implicated as the significant proportion of the annual incidence of foodborne illness worldwide. The objectives of this study were to determine the concentrations of indicator bacteria and the presence of Salmonella spp., Shigella spp., Escherichia coli O157:H7, and Listeria monocytogenes, and to characterize predictors associated with Salmonella contamination of retail produce from fresh markets and supermarkets in Bangkok, Thailand. A total of 503 samples were collected during May 2018 and February 2019, comprised of sweet basil, spring onion, coriander, cabbage, lettuce, cucumber, and tomato, with n = 167 conventional items from fresh open-air markets, n = 168 conventional items from supermarkets, and n = 168 organic items from supermarkets. The overall prevalence in these 503 items for fecal coliforms and E. coli were 84.3% and 71.4%, with mean concentrations (± S.D.) of fecal coliforms and E. coli being 3.0×105 (± 1.3×106) and 1.8×105 (± 1.1×105) MPN/g, respectively. The concentration of fecal coliforms and E. coli was higher in produce sampled from fresh open-air markets than produce from supermarkets; similarly, these bacterial indicators were higher from produce grown under conventional methods than certified organic produce. The prevalence of Salmonella and Shigella was 4.8% and 0.4%, respectively, but no positives were found for E. coli O157:H7 and L. monocytogenes. The predominant Salmonella serovar were Stanley (30.8%). Based on logistic regression, the odds of Salmonella contamination were significantly (p < 0.05) higher during the rainy versus dry season, produce grown using conventional versus organic agriculture, sweet basil versus other commodities, and using ice tank versus dry refrigeration for overnight retail storage. This study indicated that fruits and vegetables are important sources of microbial contamination. Hence, monitoring and surveillance of pathogen contamination to produce is needed to strengthen food safety.
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Affiliation(s)
- Jutanat Srisamran
- Research unit in microbial food safety and antimicrobial resistance, department of veterinary public health, faculty of veterinary science, Bangkok, Thailand
| | - Edward R Atwill
- Western center for food safety, university of California, Davis, Davis, California, USA
| | - Rungtip Chuanchuen
- Research unit in microbial food safety and antimicrobial resistance, department of veterinary public health, faculty of veterinary science, Bangkok, Thailand
| | - Saharuetai Jeamsripong
- Research unit in microbial food safety and antimicrobial resistance, department of veterinary public health, faculty of veterinary science, Bangkok, Thailand
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Saelens G, Robertson L, Gabriël S. Diagnostic tools for the detection of taeniid eggs in different environmental matrices: A systematic review. Food Waterborne Parasitol 2022; 26:e00145. [PMID: 35198745 PMCID: PMC8844199 DOI: 10.1016/j.fawpar.2022.e00145] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2021] [Revised: 01/20/2022] [Accepted: 02/01/2022] [Indexed: 12/23/2022] Open
Abstract
The cestode family Taeniidae consists of the genera Echinococcus and Taenia, both of which include zoonotic tapeworms of serious public health importance. Various environmental matrices have been identified from which parasite transmission to animals and humans can occur, and many techniques for detecting taeniid eggs in different environments have been developed. However, the majority lack appropriate validation, and standardized egg isolation procedures are absent. This hampers interstudy comparisons and poses a challenge for future researchers when deciding which technique to implement for assessing taeniid egg contamination in a particular matrix. Therefore, the aim of this systematic review was to present an overview of the detection methods for taeniid eggs in the environment, to discuss and compare them, and to provide recommendations for future studies. In total, 1814 publications were retrieved from scientific databases, and, ultimately, data were systematically reviewed from 90 papers. The results provide an overview of numerous diagnostic tests for taeniid egg detection in (or on) water, food, soil, insects, objects, and air. These tools could be categorized as either conventional (light microscopy), molecular, or immunodetection tools. The relatively cheap microscopy techniques often lack sensitivity and are unable to identify a taeniid egg at the genus level. Nevertheless, several records ascribed a genus, or even species, to taeniid eggs that had been detected by light microscopy. Molecular and immunodetection tools offer better specificity, but still rely on the preceding egg recovery steps that also affect overall sensitivity. Finally, the majority of the methods lacked any attempt at performance evaluation and standardization, especially at the earlier stages of the analysis (e.g., sampling strategy, storage conditions, egg recovery), and viability was rarely addressed. As such, our review highlights the need for standardized, validated detection tools, that not only assess the extent of environmental contamination, but also the egg genus or species, and address viability. The cestode family Taeniidae contains species of serious public health importance. Parasite transmission may occur from several environmental matrices. Many methods for environmental detection of taeniid eggs have been developed. These often lack standardization, performance evaluation, and viability assessment.
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Oliveira JR, Pedroso RCDC, Cunha SND, Castro VS, Cunha Neto AD. Evaluation of two analytical methods of detection for intestinal parasites in curly lettuce sold in food stalls. BRAZILIAN JOURNAL OF FOOD TECHNOLOGY 2022. [DOI: 10.1590/1981-6723.00221] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Abstract This study aimed to investigate the occurrence of parasitic structures in curly lettuce (Lactuca sativa L.) sold in food stalls open markets in Cuiabá city, in the Brazilian state of Mato Grosso (MT). For this purpose, 50 samples were evaluated using spontaneous sedimentation and centrifugal flotation methods. These techniques showed positivity in 96% (48/50) and 78% (39/50) of the samples, respectively. The sedimentation method was statistically (p ≤ 0.05) more effective in detecting parasitic structures of the pathogens as Entamoeba histolytica, Ascaris spp., Strongyloides spp., Larvae and Hookworm eggs, when comparing both methods. However, these methods did not differ significantly for the detection of Giardia lamblia. Ascaris spp and Entamoeba coli occurred in 64% (32/50) and 46% (23/50) of the positive samples, respectively, with the highest percentages observed. The occurrence of Blastocystis spp., Fasciola spp., Dipylidium caninum and Ascaris lumbricoides revealed detection exclusively by the spontaneous sedimentation method, while Iodamoeba butschlii and Enterobius vermicularis were detected by centrifugal– flotation procedure. These results could reinforce the need to use methods based on sedimentation and the fluctuation of parasite structures in the analysis of lettuce. The presence of parasites in lettuce by fecal origin, with recognized pathogenicity, represents a risk to consumer health and demonstrates a deficit in good agricultural practices in the production, distribution and commercialization of lettuce.
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Affiliation(s)
| | | | | | - Vinicius Silva Castro
- Universidade Federal do Rio de Janeiro, Brasil; Universidade Federal de Mato Grosso, Brasil
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Hajipour N, Soltani M, Ketzis J, Hassanzadeh P. Zoonotic parasitic organisms on vegetables: Impact of production system characteristics on presence, prevalence on vegetables in northwestern Iran and washing methods for removal. Food Microbiol 2021; 95:103704. [PMID: 33397622 DOI: 10.1016/j.fm.2020.103704] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2020] [Revised: 11/26/2020] [Accepted: 11/27/2020] [Indexed: 11/15/2022]
Abstract
Fresh vegetables are essential components of a healthy and nutritious diet, but if consumed raw without proper washing and/or disinfection, can be important agents of transmission of enteric pathogens. This study aimed to determine the prevalence of zoonotic parasites on vegetables freshly harvested and "ready to eat" vegetables from greengrocers and markets in northwestern Iran. In addition, the effect of cropping system and season on contamination levels were assessed as well as the efficacy of washing procedures to remove parasites from the vegetables. A total of 2757 samples composed of field (n = 1, 600) and "ready to eat" (n = 1157) vegetables were analyzed. Vegetables included leek, parsley, basil, coriander, savory, mint, lettuce, cabbage, radish, dill, spinach, mushroom, carrot, tomato, cucumber and pumpkin. Normal physiological saline washings from 200 g samples were processed using standard parasitological techniques and examined microscopically. A total of 53.14% of vegetable samples obtained from different fields and 18.23% of "ready to eat" vegetables purchased from greengrocers and markets were contaminated with different parasitic organisms including; Entamoeba coli cysts, Giardia intestinalis cysts, Cryptosporidium parvum oocysts, Fasciola hepatica eggs, Dicrocoelium dendriticum eggs, Taenia spp. eggs, Hymenolepis nana eggs, Ancylostoma spp. eggs, Toxocara cati eggs, Toxocara canis eggs, Strongyloides stercoralis larvae, and Ascaris lumbricoides eggs. In both field and "ready to eat" vegetables, the highest parasitic contamination was observed in lettuce with a rate of 91.1% and 55.44%, respectively. The most common parasitic organism was Fasciola hepatica. A seasonal difference in contamination with parasitic organisms was found for field and "ready to eat" vegetables (P < 0.05). There was a significant difference in the recovery of parasitic organisms depending on the washing method with water and dishwashing liquid being the least effective. Proper washing of vegetables is imperative for a healthy diet as the results of this study showed the presence of zoonotic parasites from field and ready to eat vegetables in Iran.
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Affiliation(s)
- Nasser Hajipour
- Department of Pathobiology, Faculty of Veterinary Medicine, University of Tabriz, Tabriz, Iran.
| | - Maryam Soltani
- Department of Pathobiology, Faculty of Veterinary Medicine, Urmia University, Urmia, Iran
| | - Jennifer Ketzis
- Biomedical Sciences, Ross University School of Veterinary Medicine, Basseterre, St Kitts, USA.
| | - Parviz Hassanzadeh
- Department of Food Hygiene and Aquatic, Faculty of Veterinary Medicine, University of Tabriz, Tabriz, Iran
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Kyere EO, Foong G, Palmer J, Wargent JJ, Fletcher GC, Flint S. Biofilm formation of Listeria monocytogenes in hydroponic and soil grown lettuce leaf extracts on stainless steel coupons. Lebensm Wiss Technol 2020. [DOI: 10.1016/j.lwt.2020.109114] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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Szczech M, Kowalska B, Smolińska U, Maciorowski R, Oskiera M, Michalska A. Microbial quality of organic and conventional vegetables from Polish farms. Int J Food Microbiol 2018; 286:155-161. [PMID: 30145444 DOI: 10.1016/j.ijfoodmicro.2018.08.018] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2017] [Revised: 07/11/2018] [Accepted: 08/18/2018] [Indexed: 11/28/2022]
Abstract
Microbiological analyses of lettuce, radish, carrot and beetroot were conducted to determine the effect of production system (organic and conventional) on the microbial quality of vegetables in Poland. During 2010-2014 growing seasons, 600 organic and 372 conventional samples were collected from certified farms. The vegetables were analyzed for aerobic mesophilic bacteria, yeasts and molds, Enterobacteriaceae, coliforms and Escherichia coli according to Polish standards. The farmer's survey was conducted to collect information on farm management practices. The index (from 0 - no risk to 4 - high risk) of potential contamination of the produce by human pathogens, related to fertilization system was developed. The mesophilic bacteria, yeasts and molds, coliforms and Enterobacteriaceae numbers for the radish and carrot were similar for organic and conventional cultivation systems (mesophilic bacteria 7.0 log10 cfu g-1 and 6.6 log10 cfu g-1; yeasts and molds 5.1 and 4.8; coliforms 1.3 and 1.5; Enterobacteriaceae 2.1 and 2.3 for radish and carrot respectively). Organic lettuce harbored significantly more bacteria than conventional (mesophilic 6.7 log10 cfu g-1 and 6.4 log10 cfu g-1, coliforms 1.8 and 1.4; Enterobacteriaceae 2.5 and 1.9 for organic and conventional respectively). Organic beetroot contained higher number of yeasts and molds (5.1 log10 cfu g-1) and Enterobacteriaceae (2.9 log10 cfu g-1) than conventional (4.9 and 2.5 log10 cfu g-1). The vegetables from organic farms showed significantly higher load of E. coli (on average 0.42 log10 cfu g-1) than conventionally cultivated vegetables (in average 0.05 log10 cfu g-1). The index 0-4 of potential risk of produce contamination by human pathogens was created according to fertilization practices in both farm types. Its value increased with enhanced contribution of manures and other animal wastes. In organic production the main fertilization practice was application of animal manures, composted and not composted. A popular practice was also top dressing of growing plants with fermented plant extracts, sometimes enriched with dungwater. In conventional farming system mineral fertilization was the main source of the vegetable nutrition. Therefore, organic produce indicated higher index of contamination risk (2-4) than conventional vegetables (1-2). High indexes were positively associated with higher number of E. coli. It was found that fertilization system practiced in organic farms may deteriorate sanitary quality of the produce.
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Affiliation(s)
- Magdalena Szczech
- Research Institute of Horticulture, Department of Microbiology, Konstytucji 3 Maja 1/3, 96-100 Skierniewice, Poland.
| | - Beata Kowalska
- Research Institute of Horticulture, Department of Microbiology, Konstytucji 3 Maja 1/3, 96-100 Skierniewice, Poland
| | - Urszula Smolińska
- Research Institute of Horticulture, Department of Microbiology, Konstytucji 3 Maja 1/3, 96-100 Skierniewice, Poland
| | - Robert Maciorowski
- Research Institute of Horticulture, Economics and Statistics Section, Konstytucji 3 Maja 1/3, 96-100 Skierniewice, Poland
| | - Michał Oskiera
- Research Institute of Horticulture, Department of Microbiology, Konstytucji 3 Maja 1/3, 96-100 Skierniewice, Poland
| | - Anna Michalska
- Research Institute of Horticulture, Department of Microbiology, Konstytucji 3 Maja 1/3, 96-100 Skierniewice, Poland
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Kyere EO, Palmer J, Wargent JJ, Fletcher GC, Flint S. Colonisation of lettuce byListeria Monocytogenes. Int J Food Sci Technol 2018. [DOI: 10.1111/ijfs.13905] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Emmanuel O. Kyere
- Institute of Food Science and Technology; School of Food and Nutrition; Massey University; Private Bag 11222 Palmerston North New Zealand
| | - Jon Palmer
- Institute of Food Science and Technology; School of Food and Nutrition; Massey University; Private Bag 11222 Palmerston North New Zealand
| | - Jason J. Wargent
- Institute of Agriculture & Environment; Massey University; Private Bag 11222 Palmerston North New Zealand
| | - Graham C. Fletcher
- The New Zealand Institute for Plant & Food Research Limited; Private Bag 92169 Auckland 1142 New Zealand
| | - Steve Flint
- Institute of Food Science and Technology; School of Food and Nutrition; Massey University; Private Bag 11222 Palmerston North New Zealand
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12
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Rossi EM, Beilke L, Barreto JF. Microbial contamination and good manufacturing practices in school kitchen. J Food Saf 2017. [DOI: 10.1111/jfs.12417] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Eliandra Mirlei Rossi
- Microbiology Laboratory, Departments of Biological Science and HealthUniversidade do Oeste de Santa Catarina ‐ UNOESC, São Miguel do Oeste‐SC Santa Catarina Brazil
| | - Luniele Beilke
- Microbiology Laboratory, Departments of Biological Science and HealthUniversidade do Oeste de Santa Catarina ‐ UNOESC, São Miguel do Oeste‐SC Santa Catarina Brazil
| | - Jessica Fernanda Barreto
- Microbiology Laboratory, Departments of Biological Science and HealthUniversidade do Oeste de Santa Catarina ‐ UNOESC, São Miguel do Oeste‐SC Santa Catarina Brazil
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Hurtado-Barroso S, Tresserra-Rimbau A, Vallverdú-Queralt A, Lamuela-Raventós RM. Organic food and the impact on human health. Crit Rev Food Sci Nutr 2017; 59:704-714. [PMID: 29190113 DOI: 10.1080/10408398.2017.1394815] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
In the last decade, the production and consumption of organic food have increased steadily worldwide, despite the lower productivity of organic crops. Indeed, the population attributes healthier properties to organic food. Although scientific evidence is still scarce, organic agriculture seems to contribute to maintaining an optimal health status and decreases the risk of developing chronic diseases. This may be due to the higher content of bioactive compounds and lower content of unhealthy substances such as cadmium and synthetic fertilizers and pesticides in organic foods of plant origin compared to conventional agricultural products. Thus, large long-term intervention studies are needed to determine whether an organic diet is healthier than a diet including conventionally grown food products. This review provides an update of the present knowledge of the impact of an organic versus a conventional food diet on health.
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Affiliation(s)
- Sara Hurtado-Barroso
- a Department of Nutrition, Food Sciences and Gastronomy, School of Pharmacy and Food Sciences , University of Barcelona , Barcelona , Spain.,b CIBER Physiopathology of Obesity and Nutrition (CIBEROBN), Institute of Health Carlos III , Spain.,c INSA-UB, Nutrition and Food Safety Research Institute, University of Barcelona , Barcelona , Spain
| | - Anna Tresserra-Rimbau
- a Department of Nutrition, Food Sciences and Gastronomy, School of Pharmacy and Food Sciences , University of Barcelona , Barcelona , Spain.,b CIBER Physiopathology of Obesity and Nutrition (CIBEROBN), Institute of Health Carlos III , Spain.,c INSA-UB, Nutrition and Food Safety Research Institute, University of Barcelona , Barcelona , Spain
| | - Anna Vallverdú-Queralt
- a Department of Nutrition, Food Sciences and Gastronomy, School of Pharmacy and Food Sciences , University of Barcelona , Barcelona , Spain.,b CIBER Physiopathology of Obesity and Nutrition (CIBEROBN), Institute of Health Carlos III , Spain
| | - Rosa María Lamuela-Raventós
- a Department of Nutrition, Food Sciences and Gastronomy, School of Pharmacy and Food Sciences , University of Barcelona , Barcelona , Spain.,b CIBER Physiopathology of Obesity and Nutrition (CIBEROBN), Institute of Health Carlos III , Spain.,c INSA-UB, Nutrition and Food Safety Research Institute, University of Barcelona , Barcelona , Spain
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LUZ JGG, BARBOSA MV, CARVALHO AGD, RESENDE SD, DIAS JVL, MARTINS HR. Contamination by intestinal parasites in vegetables marketed in an area of Jequitinhonha Valley, Minas Gerais, Brazil. REV NUTR 2017. [DOI: 10.1590/1678-98652017000100012] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
ABSTRACT Objective: The present study aimed to evaluate the presence of helminthes and intestinal protozoa in vegetables commercialized in Diamantina, a municipality located at Jequitinhonha Valley, one of the poorest regions of the world. Methods: A total of 108 specimens, including lettuce, green onion and rocket, were monthly collected from the most popular open street market, green grocery and supermarket of the municipality. The samples were processed by a concentration method and evaluated by light microscopy for parasitological identification. Results: The percentage of contamination was 50.9% (55/108), with predominance of nematode larvae (36.5%), cysts of Entamoeba coli (26.0%) and eggs of hookworms/Strongyloides spp. (12.9%). Lettuce showed greater contamination rate (61.1%) and samples from the open street market were more contaminated (77.8%). Information collected at each point of sale pointed the field cultivation as the critical step for such contaminations. Conclusion: Vegetables marketed in Diamantina presents a wide variety of intestinal parasites, which may represent a potential risk to the health of consumers of fresh vegetables.
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Affiliation(s)
| | | | - Amanda Gabriela de CARVALHO
- Universidade Federal de Mato Grosso, Brazil; Universidade Federal dos Vales do Jequitinhonha e Mucuri, Brazil
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15
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Oyinlola LA, Obadina AO, Omemu AM, Oyewole OB. Prevention of microbial hazard on fresh-cut lettuce through adoption of food safety and hygienic practices by lettuce farmers. Food Sci Nutr 2017; 5:67-75. [PMID: 28070317 PMCID: PMC5217913 DOI: 10.1002/fsn3.365] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2015] [Revised: 03/01/2016] [Accepted: 03/08/2016] [Indexed: 11/07/2022] Open
Abstract
Lettuce is consumed raw in salads and is susceptible to microbial contamination through environment, agricultural practices, and its morphology, thus, a potential vehicle for food-borne illness. This study investigated the effect of adoption of food safety and hygienic practices by lettuce farmers on the microbial safety of field sourced lettuce in Lagos State, Nigeria. Ten structured questionnaires were administered randomly to 10 lettuce farmers to assess food safety and hygienic practices (FSH). Two farmers who practice FSH and two farmers who do not practice NFSH were finally used for this study. Samples of ready-to-harvest lettuce, manure applied, and irrigation water were obtained for a period of five months (August - December 2013) and analyzed for total plate count (TPC), total coliform count (TCC), Escherichia coli, Listeria spp., Salmonella spp., and Shigella spp. counts. Result of microbial analyses of lettuce samples was compared with international microbiological specification for ready-to-eat foods. Results showed that the range of TPC on lettuce was 6.00 to 8.11 LogCFU/g from FSH farms and TPC of lettuce samples from NFSH farms ranged from 6.66 to 13.64 LogCFU/g. 1.49 to 4.85LogCFU/g were TCC ranges from lettuce samples obtained from FSH farms while NFSH farms had TCC ranging between 3.95 and 10.86 LogCFU/g, respectively. The range of isolated pathogen count on lettuce from FSH and NFSH farms exceeded the international safety standard; there was a significant difference in the microbial count of lettuce from FSH farms and NFSH farms. This study concludes that the lettuce samples obtained did not pass the international microbial safety standards. FSH compliance is a major determinant of the microbial safety of lettuce. Hence, the institution of FSH on farm to improve microbial safety of lettuce produced for public consumption is emphasized.
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Affiliation(s)
- Lateefah A. Oyinlola
- Department of Food Science and TechnologyFederal University of AgricultureAbeokutaNigeria
| | - Adewale O. Obadina
- Department of Food Science and TechnologyFederal University of AgricultureAbeokutaNigeria
| | - Adebukunola M. Omemu
- Department of Hospitality and Tourism ManagementFederal University of AgricultureAbeokutaNigeria
| | - Olusola B. Oyewole
- Department of Food Science and TechnologyFederal University of AgricultureAbeokutaNigeria
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16
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Microbiology of organic and conventionally grown fresh produce. Braz J Microbiol 2016; 47 Suppl 1:99-105. [PMID: 27825766 PMCID: PMC5156503 DOI: 10.1016/j.bjm.2016.10.006] [Citation(s) in RCA: 42] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2016] [Accepted: 10/05/2016] [Indexed: 11/23/2022] Open
Abstract
Fresh produce is a generalized term for a group of farm-produced crops, including fruits and vegetables. Organic agriculture has been on the rise and attracting the attention of the food production sector, since it uses eco-agricultural principles that are ostensibly environmentally-friendly and provides products potentially free from the residues of agrochemicals. Organic farming practices such as the use of animal manure can however increase the risk of contamination by enteric pathogenic microorganisms and may consequently pose health risks. A number of scientific studies conducted in different countries have compared the microbiological quality of produce samples from organic and conventional production and results are contradictory. While some have reported greater microbial counts in fresh produce from organic production, other studies do not. This manuscript provides a brief review of the current knowledge and summarizes data on the occurrence of pathogenic microorganisms in vegetables from organic production.
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Ramirez-Martinez ML, Olmos-Ortiz LM, Barajas-Mendiola MA, Giono Cerezo S, Avila EE, Cuellar-Mata P. A PCR procedure for the detection of Giardia intestinalis cysts and Escherichia coli in lettuce. Lett Appl Microbiol 2015; 60:517-23. [PMID: 25689035 DOI: 10.1111/lam.12402] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2014] [Revised: 01/30/2015] [Accepted: 02/01/2015] [Indexed: 11/28/2022]
Abstract
Giardia intestinalis is a pathogen associated with foodborne outbreaks and Escherichia coli is commonly used as a marker of faecal contamination. Implementation of routine identification methods of G. intestinalis is difficult for the analysis of vegetables and the microbiological detection of E. coli requires several days. This study proposes a PCR-based assay for the detection of E. coli and G. intestinalis cysts using crude DNA isolated from artificially contaminated lettuce. The G. intestinalis and E. coli PCR assays targeted the β-giardin and uidA genes, respectively, and were 100% specific. Forty lettuces from local markets were analysed by both PCR and light microscopy and no cysts were detected, the calculated detection limit was 20 cysts per gram of lettuce; however, by PCR, E. coli was detected in eight of ten randomly selected samples of lettuce. These data highlight the need to validate procedures for routine quality assurance. These PCR-based assays can be employed as alternative methods for the detection of G. intestinalis and E. coli and have the potential to allow for the automation and simultaneous detection of protozoa and bacterial pathogens in multiple samples. Significance and impact of the study: There are few studies for Giardia intestinalis detection in food because methods for its identification are difficult for routine implementation. Here, we developed a PCR-based method as an alternative to the direct observation of cysts in lettuce by light microscopy. Additionally, Escherichia coli was detected by PCR and the sanitary quality of lettuce was evaluated using molecular and standard microbiological methods. Using PCR, the detection probability of Giardia cysts inoculated onto samples of lettuce was improved compared to light microscopy, with the advantage of easy automation. These methods may be employed to perform timely and affordable detection of foodborne pathogens.
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Affiliation(s)
- M L Ramirez-Martinez
- Departamento de Biologia, Division de Ciencias Naturales y Exactas, Universidad de Guanajuato, Guanajuato, Mexico
| | - L M Olmos-Ortiz
- Departamento de Biologia, Division de Ciencias Naturales y Exactas, Universidad de Guanajuato, Guanajuato, Mexico
| | - M A Barajas-Mendiola
- Departamento de Biologia, Division de Ciencias Naturales y Exactas, Universidad de Guanajuato, Guanajuato, Mexico
| | - S Giono Cerezo
- Departamento de Microbiologia, Escuela Nacional de Ciencias Biologicas, Instituto Politecnico Nacional, Delegacion Miguel Hidalgo, DF, Mexico
| | - E E Avila
- Departamento de Biologia, Division de Ciencias Naturales y Exactas, Universidad de Guanajuato, Guanajuato, Mexico
| | - P Cuellar-Mata
- Departamento de Biologia, Division de Ciencias Naturales y Exactas, Universidad de Guanajuato, Guanajuato, Mexico
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18
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Human intestinal helminth contamination in pre-washed, fresh vegetables for sale in major markets in Ogun State, southwest Nigeria. Food Control 2015. [DOI: 10.1016/j.foodcont.2014.10.033] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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19
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de Quadros Rodrigues R, Loiko MR, Minéia Daniel de Paula C, Hessel CT, Jacxsens L, Uyttendaele M, Bender RJ, Tondo EC. Microbiological contamination linked to implementation of good agricultural practices in the production of organic lettuce in Southern Brazil. Food Control 2014. [DOI: 10.1016/j.foodcont.2014.01.043] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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20
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Ceuppens S, Hessel CT, de Quadros Rodrigues R, Bartz S, Tondo EC, Uyttendaele M. Microbiological quality and safety assessment of lettuce production in Brazil. Int J Food Microbiol 2014; 181:67-76. [PMID: 24829142 DOI: 10.1016/j.ijfoodmicro.2014.04.025] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2014] [Revised: 04/21/2014] [Accepted: 04/22/2014] [Indexed: 11/18/2022]
Abstract
The microbiological quality and safety of lettuce during primary production in Brazil were determined by enumeration of hygiene indicators Escherichia coli, coliforms and enterococci and detection of enteric pathogens Salmonella and E. coli O157:H7 in organic fertilizers, soil, irrigation water, lettuce crops, harvest boxes and worker's hands taken from six different lettuce farms throughout the crop growth cycle. Generic E. coli was a suitable indicator for the presence of Salmonella and E. coli O157:H7, while coliforms and enterococci were not. Few pathogens were detected: 5 salmonellae and 2 E. coli O157:H7 from 260 samples, of which only one was lettuce and the others were manure, soil and water. Most (5/7) pathogens were isolated from the same farm and all were from organic production. Statistical analysis revealed the following environmental and agro-technical risk factors for increased microbial load and pathogen prevalence in lettuce production: high temperature, flooding of lettuce fields, application of contaminated organic fertilizer, irrigation with water of inferior quality and large distances between the field and toilets. Control of the composting process of organic fertilizers and the irrigation water quality appear most crucial to improve and/or maintain the microbiological quality and safety during the primary production of lettuce.
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Affiliation(s)
- Siele Ceuppens
- Ghent University, Faculty of Bioscience Engineering, Department of Food Safety and Food Quality, Laboratory of Food Microbiology and Food Preservation (LFMFP), Ghent, Belgium
| | - Claudia Titze Hessel
- Food Microbiology Laboratory of Food Science and Technology Institute (ICTA) of Federal University of Rio Grande do Sul (ICTA/UFRGS), Porto Alegre, Brazil
| | - Rochele de Quadros Rodrigues
- Food Microbiology Laboratory of Food Science and Technology Institute (ICTA) of Federal University of Rio Grande do Sul (ICTA/UFRGS), Porto Alegre, Brazil
| | - Sabrina Bartz
- Food Microbiology Laboratory of Food Science and Technology Institute (ICTA) of Federal University of Rio Grande do Sul (ICTA/UFRGS), Porto Alegre, Brazil
| | - Eduardo César Tondo
- Food Microbiology Laboratory of Food Science and Technology Institute (ICTA) of Federal University of Rio Grande do Sul (ICTA/UFRGS), Porto Alegre, Brazil
| | - Mieke Uyttendaele
- Ghent University, Faculty of Bioscience Engineering, Department of Food Safety and Food Quality, Laboratory of Food Microbiology and Food Preservation (LFMFP), Ghent, Belgium.
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