Esther van Asselt

Esther van Asselt
Wageningen University & Research | WUR · RIKILT

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87
Publications
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Publications

Publications (87)
Article
Traditionally, meat and dairy products have been important protein sources in the human diet. Consumers are eating more plant-based proteins, which is reflected in current market trends. Assessing how alternative proteins are processed and their impact on food safety helps realize market opportunities while ensuring food safety. In this review, an...
Article
European food production systems have become very efficient in terms of high yield, quality and safety. However, these production systems are not sustainable since, amongst other reasons, a significant proportion of the production is wasted or lost in the supply chain. One of the strategies of the European Union is to achieve climate neutrality by...
Article
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Food production has increasingly become effective but not necessarily sustainable. Transitioning toward circular production systems aiming to minimize waste and reuse materials is one of the means to obtain a more sustainable food production system. However, such a circular food production system can also lead to the accumulation and recirculation...
Article
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Risk‐based monitoring programs are increasingly applied for cost‐effective monitoring of food safety. Such programs ideally consist of three steps: risk‐ranking, risk‐based inspections, and cost‐effective monitoring. Various methods have been described to perform the first step of risk‐based monitoring. However, once the risk‐ranking has been compl...
Article
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Irrigation water is a potential source of contamination of leafy vegetables that are grown in the field. There is an urgent need to support technologies that are designed to ensure food safety, including those technologies that can disinfect irrigation water used to cultivate crops. Previous research has yet to evaluate the microbial and economic e...
Article
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Global food supply chains have been constantly challenged by various food safety incidents or crisis. Traditional approaches on enhancing robustness of the food supply chain are not sufficient to ensure a safe food supply to the society, while building resilience as a more comprehensive approach has shown to be a good alternative option. With a res...
Article
Purpose - Leafy vegetables may get contaminated with pathogens through the use of irrigation water during open field cultivation. The main control option to prevent this contamination is the use of disinfection technologies that will reduce the pathogenic load of the irrigation water. Several technologies, either chemical or physical, are available...
Article
Voedselfabrikanten willen graag al in een vroeg stadium van het productontwerp, op een gestructureerde, transparante en reproduceerbare wijze, een gevarenidentificatie kunnen uitvoeren. WUR-onderzoekers ontwikkelen daar momenteel een digitale tool voor. Dit hulpmiddel helpt producenten om de beschikbare wetenschappelijke kennis over voedselveilighe...
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Nuclear accidents do not occur frequently, but their biological, psychosocial and/or economic consequences may be severe. Hence, a thorough preparation for nuclear emergencies is needed to provide appropriate actions. During the transition phase of an accident, it is vital to include stakeholders in the decision‐making process in order to gain supp...
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Background In the last decades, food produced by Aquaculture has seen an impressive increase worldwide but maintaining high quality and safety is increasingly becoming a concern. It is apparent that changes in- and outside the aquaculture supply chain may act as driving forces for the introduction of food safety hazards. Knowledge on these drivers...
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Within the CONFIDENCE project, comprehensive methods have been developed for better support of decision making under uncertain conditions, mainly by use of Multi Criteria Decision Analysis (MCDA). While MCDA in general was available for use in the radiological crisis management community, no method of analysing uncertain conditions and supporting r...
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Under the framework of the CONFIDENCE project, work package 4 was focusing on the transition to long-term recovery, involving stakeholders in decision-making processes. The essential research was performed using a participatory approach, which combined scenario-based stakeholder discussion panels and transnational stakeholder surveys following the...
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An emergency situation is subject to multiple sources of uncertainties which should be identified in advance in order to improve the emergency and recovery management, and so optimally foster the living conditions of the population and the quality of their environment. In this context, the Work Package 4 of the European Research Project CONFIDENCE...
Article
Aims: The objective of this work is to investigate whether changes in bladder pressure's patterns can be used to forecast voiding events in rats with both normal and overactive detrusor. Methods: A voiding forecasting algorithm based on machine learning was developed. Raw pressure curves as well as their corresponding power bands were used as input...
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Researchers, governments, agencies, food producers and the civil society are increasingly concerned about ‘emerging food risks’. It is recognised that the successful identification of emerging risks is at the heart of protecting public health and the environment, and that this requires worldwide cooperation between all parties involved in the food...
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Monitoring programs for food safety hazards are increasingly set up on a risk basis. In order to include the most relevant chemical substances for food products within such a program, a prioritization is needed. Within this research, decision trees were developed to rank chemical substances that may occur in food products. The decision trees focus...
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Following legislation, European Member States should have multi-annual control programs for contaminants, such as for mycotoxins, in feed and food. These programs need to be risk based implying the checks are regular and proportional to the estimated risk for animal and human health. This study aimed to prioritize feed products in the Netherlands f...
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Monitoring programs are preferably risk-based, which allows focusing on the most relevant human health risks. In this study, a risk matrix was used to identify those chemical hazards that have the highest human health risk for the following spices and herbs: paprika/chilli powder, black pepper, nutmeg, basil, thyme, and parsley. Both the probabilit...
Article
In order to prevent food safety incidents from becoming a crisis, a good crisis management structure is essential. The aim of the current study was to compare and evaluate the national food incident response plans of 2 neighboring EU Member States: Germany and the Netherlands. This revealed that the structure of these plans is comparable, starting...
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Recommendations and requirements for the management of foodstuffs including drinking water and feedstuffs (but not other commodities) contaminated after a nuclear accident or a radiological event have been developed by international bodies such as Codex Alimentarius Commission or European Union as well as by individual countries. However, the exper...
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Monitoring of dairy products should preferably focus on the most relevant food safety hazards in the dairy supply chain. For this purpose, the possible presence of microbiological, chemical, and physical hazards as well as trends in the dairy supply chain that may affect their presence were assessed. A literature review was combined with available...
Article
Production of sufficient, safe and nutritious food is a global challenge faced by the actors operating in the food production chain. The performance of food-producing systems from farm to fork is directly and indirectly influenced by major changes in, for example, climate, demographics, and the economy. Many of these major trends will also drive th...
Chapter
Foodborne illnesses can be caused by a wide range of microorganisms. Data analysis can help to determine which microorganisms give the highest contribution to the number of foodborne illnesses. This helps to decide which pathogen(s) to focus on in order to reduce the number of illnesses. The same accounts for the products that are related to foodbo...
Article
Purpose – The purpose of this paper is to simulate compliance behaviour of entrepreneurs in the Netherlands based on the Table of Eleven: 11 factors determining compliance (based on economic, cognitive, social and institutional factors). Design/methodology/approach – An Agent-Based Model (ABM) was developed that could incorporate both individual a...
Article
This study aimed to critically review methods for ranking risks related to food safety and dietary hazards on the basis of their anticipated human health impacts. A literature review was performed to identify and characterize methods for risk ranking from the fields of food, environmental science and socio-economic sciences. The review used a prede...
Book
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FOODMETRES has combined quantitative and qualitative methods and engaged with a variety of actors in metropolitan regions including food producers, civic food organisations, and government bodies. FOODMETRES defines metropolitan regions in the context of the land use impacts of cities on their surrounding areas. It hence considers phenomena such as...
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Housing systems for laying hens have changed over the years due to increased public concern regarding animal welfare. In terms of sustainability, animal welfare is just one aspect that needs to be considered. Social aspects as well as environmental and economic factors need to be included as well. In this study, we assessed the sustainability of en...
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FOODMETRES aims to describe, analyse and facilitate the development of short food supply chain (SFSC) innovations in metropolitan regions, including their rural, urban and periurban areas. The research carried out in this project covers questions of food production, processing and logistics; its focus is sustainable and resource-efficient soluti...
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Food chains considered to be sustainable are chains that produce food closer to the city, reduce the number of steps in the chain and use natural resources more efficiently. In the FOODMETRES project (see previous article), case studies were undertaken for six metropolitan regions – London, Rotterdam, Berlin, Milan, Ljubljana, and Nairobi – to show...
Article
De meeste ondernemers zijn brave hardwerkende lieden, maar er zijn uitzonderingen. De recente crises in de voedselindustrie hebben dat overduidelijk aangetoond. Voorkomen is beduidend moeilijker dan handhaven, maar niet onmogelijk. RIKILT heeft in samenwerking met Wageningen Universiteit een simulatiemodel ontwikkeld waarmee toezichthouders het eff...
Article
Part of risk based control is the prioritization of hazard-food combinations for monitoring food safety. The aim of the current study was to develop a method for risk ranking of chemical food safety hazards using a structured and transparent approach. The method established is semi-quantitative and uses scores on both severity and probability of th...
Technical Report
In dit project is een Hygiënecode voor Streekproducten ontwikkeld die specifiek is voor de betreffende producent en gebaseerd is op bestaande hygiënecodes in de groente- en fruitketen, de zuivelketen, en de vleesketen. De code is digitaal beschikbaar en de ondernemer kan aan de hand van een vragenlijst de voor hem specifieke hygiënecode downloaden.
Article
Dietary intake is the predominant route for human exposure to perfluorooctane sulfonic acid (PFOS). Single pollution events may thus affect human exposure if polluted ground and water is used to produce animal feed or food. In this study, a physiologically based pharmacokinetic (PBPK-) model is derived that describes the uptake of PFOS from contami...
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Climate change is expected to aggravate feed and food safety problems of crops; however, quantitative estimates are scarce. This study aimed to estimate impacts of climate change effects on deoxynivalenol contamination of wheat and maize grown in the Netherlands by 2040. Quantitative modelling was applied, considering both direct effects of changin...
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Based on a data set on Campylobacter and Salmonella prevalence in the broiler supply chain, collected during the period 2002 through 2005 in the Netherlands, farm- and slaughterhouse-specific characteristics were tested for their effect on Campylobacter and Salmonella prevalence at different stages of the broiler supply chain. Three different sampl...
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The phenological development of cereal crops from emergence through flowering to maturity is largely controlled by temperature, but also affected by day length and potential physiological stresses. Responses may vary between species and varieties. Climate change will affect the timing of cereal crop development, but exact changes will also depend o...
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Mycotoxins are secondary metabolites produced by fungi that can cause adverse health effects. Due to climate change, temperatures are expected to rise and changes in rainfall patterns are foreseen. These developments may increase fungal occurrence and mycotoxin concentrations in maize. It is therefore useful to monitor mycotoxin levels in maize and...
Article
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This study aimed to investigate mycotoxin contamination of cereal grain commodities for feed and food production in North Western Europe during the last two decades, including trends over time and co-occurrence between toxins, and to assess possible effects of climate on the presence of mycotoxins. For these aims, analytical results related to myco...
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The predominant species in maize in temperate climates is Fusarium graminearum, which produces the mycotoxins deoxynivalenol and zearalenone. Projected climate change is expected to affect Fusarium incidence and thus the occurrence of these mycotoxins. Predictive models may be helpful in determining trends in the levels of these mycotoxins with exp...
Article
This paper gives an overview of methods available for implementing Risk Based Control (RBC), consisting of two steps: Risk Categorization (RC) and Risk Based Surveillance (RBS). Various models and approaches are available for prioritizing hazard-food combinations in RC. Economic models and expert elicitation can be used to include the food safety p...
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The aim of this research was to determine the decimal reduction times of bacteria present on chicken fillet in boiling water. The experiments were conducted with Campylobacter jejuni, Salmonella, and Escherichia coli. Whole chicken breast fillets were inoculated with the pathogens, stored overnight (4°C), and subsequently cooked. The surface tempe...
Article
Perfluorooctane sulphonate (PFOS) is a persistent organic pollutant with adverse effects on human health. Since dietary intake plays an important role in human exposure, the transfer of PFOS throughout the food chain needs further investigation. The aim of this paper is to give an overview of PFOS concentrations and transfer for the various chain s...
Article
Worldwide biofuel products have rapidly entered the market and consequently so did the availability of their by-products for feed production. A pro-active emerging risk system for biofuel by-products is essential in order to prevent the occurrence of emerging hazards in feed and livestock production. In the current study, two biofuel by-products we...
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The aim of this study was to investigate farm-level economic and technical factors that are associated with the use of antibiotics on pig farms. Identification of such factors, like farm size and net farm result, may help to increase epidemiological knowledge and to specify farm advice and policy making to reduce inappropriate use of antibiotics. T...
Article
The aim of the present project was to determine the most critical steps in the production of fats and oils. First, production processes of vegetables oils, animal fat, fish oil, biodiesel and fat blending were studied and experts from the industry as well as in-house dioxin experts were consulted to identify the most critical steps. Then, monitorin...
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Op verzoek van het ministerie van EL&I en het ministerie van VWS heeft het LEI de huidige communicatie vanuit de overheid over de duurzaamheid, gezondheid en veiligheid van voedsel geanalyseerd en verbeterpunten hiervoor geïdentificeerd. De overheid verbetert de betrouwbaarheid en daarmee de effectiviteit van haar communicatie over de duurzaamheid,...
Article
A pro-active emerging risk identification system starts with the selection of critical factors related to the occurrence of emerging hazards. This paper describes a method to derive the most important factors in dynamic production chains starting from a gross list of critical factors. The method comprised the semi-quantitative evaluation of the cri...
Article
A stochastic model for setting performance objectives for Salmonella in the broiler supply chain was developed. The goal of this study was to develop a model by which performance objectives for Salmonella prevalence at various points in the production chain can be determined, based on a preset final performance objective at the end of the processin...
Article
Purpose: The research described in this paper is aimed at developing a model for estimation of performance objectives (PO) in the supply chain, based on field data. As a case study, such a model has developed for Salmonella prevalence in the broiler supply chain in the Netherlands. Methodology/approach: Food safety in the supply chain can be contro...
Article
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Salmonella serotype distribution can give insight in contamination routes and persistence along a production chain. Therefore, it is important to determine not only Salmonella prevalence but also to specify the serotypes involved at the different stages of the supply chain. For this purpose, data from a national monitoring program in the Netherland...
Article
Cross-contamination and undercooking are major factors responsible for campylobacteriosis and as such should be incorporated in microbiological risk assessment. A previous paper by van Asselt et al.((1)) quantified cross-contamination routes from chicken breast fillet via hand, cutting board, and knife ending up in a prepared chicken-curry salad in...
Article
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Het huidige overheidsbeleid streeft het terugdringen van microbiële besmetting in voedselproducten naar een nulniveau na. De kans bestaat echter dat als consumenten minder risico's van voedselgebonden ziekten percipiëren, ze minder voorzichtig omgaan met etenswaren. Met een literatuurstudie is de wetenschappelijke kennis in kaart gebracht op het ge...
Article
Cross-contamination and undercooking are major factors responsible for campylobacteriosis and as such should be incorporated in microbiological risk assessment. A previous paper by van Asselt et al.(1) quantified cross-contamination routes from chicken breast fillet via hand, cutting board, and knife ending up in a prepared chicken-curry salad in t...
Article
Full-text available
After a national control program, data on Campylobacter prevalence in the broiler supply chain in the Netherlands were gathered for 3 sampling points: departure of broiler farm and arrival and departure of the slaughterhouse. Monitoring data from this control program for 2002 to 2005 were analyzed to find correlations and possible trends in the dat...
Article
This article presents detailed information on Salmonella prevalence throughout the broiler supply chain in The Netherlands, based on results from a national monitoring program. Data were collected during the period 2002 through 2005 and from six sampling points in the chain, covering hatchery up to and including processing. Trends in Salmonella pre...
Article
To quantify cross-contamination in the home from chicken to ready-to-eat salad. Based on laboratory scenarios performed by de Jong et al. (2008), transfer rates were estimated for Campylobacter jejuni and Lactobacillus casei as a tracer organism. This study showed that transfer characteristics for both micro-organisms were comparable when washing r...
Article
The aim of the present study was to demonstrate how Performance Objectives (POs) for Salmonella at various points in the broiler supply chain can be estimated, starting from pre-set levels of the PO in finished products. The estimations were performed using an analytical transmission model, based on prevalence data collected throughout the chain in...
Article
The improvement of food safety in the domestic environment requires a transdisciplinary approach, involving interaction between both the social and natural sciences. This approach is applied in a study on risks associated with Campylobacter on broiler meat. First, some web-based information interventions were designed and tested on participant moti...
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Innameberekeningen zijn uitgevoerd voor zware metalen, nitraat en zout op basis van metingen uit een duplicaat voedingsstudie bij baby's en deze zijn vergeleken met innameberekeningen op basis van monitoringsdata uit de KAP-databank. Voor de duplicaat voedingen is gebruik gemaakt van data verzameld in de EUBABY-studie van baby’s van 8 tot 12 maande...