Theses (MÉK)
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Theses collection of the Faculty of Agricultural and Food Sciences and Environmental Management. The collection was started in 2018.
At the University of Debrecen, in accordance with the 2022 amendment to the 2011 Higher Education Act, student theses are only accessible from devices connected to the University's Eduroam WiFi network or from a university IP address.
“The thesis or diploma work of a student who has successfully passed the final examination shall be stored in full in the academic system of the higher education institution, and a record shall be maintained thereof. The stored theses and diploma works – with the exception of parts classified as confidential in accordance with the relevant legislation – must be made accessible and searchable without restriction through the academic system.” Further info on the National Higher Education Act in Hungarian: Felsőokt. tv. (új) - 2011. évi CCIV. törvény a nemzeti felsőoktatásról - Hatályos Jogszabályok Gyűjteménye.
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Tétel Korlátozottan hozzáférhető A comparative study of risk assessment of toxic elements in honey consumed from the region of Bangladesh and HungaryJahan, Sharmin; Czipa, Nikolett; DE--Mezőgazdaság- Élelmiszertudományi és Környezetgazdálkodási KarThe study's goals were to characterize and assess the honey's complex elemental composition and to evaluate the possibility of toxic elements in honey from two distinct countries. Seven different floral kinds of honey were investigated, namely, mustard (Brassica nigra), Black Seed (Nigella sativa) litchi (Litchi chinensis), Wild (Sundarban’s), Acacia ( Robinia pseudoacacia), Chestnut (Castanea sativa) and Forest/Honeydew honey. The highest potassium content is found in Bangladeshi and Hungarian honey, with an average potassium content of 948 mg/kg in Bangladesh and 1367 mg/kg on average in Hungary. Samples of Hungarian honey were shown to have a lower aluminum risk than samples of Bangladeshi honey. According to the results of the current investigation, it can be assumed that children are the demographic group most exposed to toxic elements. We found that the mineral levels in black seed, wild B3, chestnut honey, and forest honey were exceptionally high.Tétel Korlátozottan hozzáférhető A comprehensive assessment of greenhouse gas emissions from wetlands within the European Union (1990-2040)Al marshudi, Amjad; Mohammed, Safwan; DE--Mezőgazdaság- Élelmiszertudományi és Környezetgazdálkodási KarThis study provides a comprehensive examination of the fluctuations in CH4 emissions from wetlands across the European Union (EU) over a specific timeframe from (1990-2020) and a projected period from (2020-2040). The study employs statistical techniques such as Mann-Kendall Analysis, Sen's Slope estimation, Tukey Test comparisons, and Principal Component Analysis to evaluate trends, magnitudes, and patterns of CH4 emissions, along with constructed bibliometric network using VOSviewer tool.Tétel Korlátozottan hozzáférhető A HAZAI TENYÉSZTÉSŰ BERRICHON DU CHER KOSOK KÖTELEZŐ ADATFELVÉTELEINEK ELEMZÉSEKrakkó, Máté; Oláh, János; DE--Mezőgazdaság- Élelmiszertudományi és Környezetgazdálkodási KarAz állattenyésztésnek számos előnye van, például, hogy folyamatos munkalehetőséget biztosít, valamint segít a talaj tápanyagtartalmának a megőrzésében ezzel hozzájárulva egy kiegyensúlyozott és jövedelmező mezőgazdasági szervezet kialakításában. Szakdolgozatom célja a juhtenyésztés helyzetének, gazdasági jelentőségének és nyilvántartási rendszerének bemutatása, különös tekintettel a berrichon du cher fajtára és a kosok bírálati rendszerére. A dolgozat leíró jellegű, szakirodalmi forrásokra épül.Tétel Korlátozottan hozzáférhető A review of ultrasound-assisted freezingLe, Quoc Long; Prokisch, József; DE--Mezőgazdaság- Élelmiszertudományi és Környezetgazdálkodási KarUltrasound has enormous potential for use in the freezing process and could bring many benefits to the food industry in particular and the community in general. This thesis summarizes key findings from selected studies and analyze them to identify trends, patterns, and gaps in the current research of ultrasound-assisted freezing. The application of ultrasound can increase freezing speed and efficiency, create more uniform frozen particle sizes, improve product quality, reduce product loss, and save energy. However, limitations were also noted, such as variability in food composition and complexity of integration. Therefore, several proposals are made in the hope of generating research and subsequently practical applications of this novel technology.Tétel Korlátozottan hozzáférhető Adalékanyagok jelenléte az élelmiszeriparban, valamint az élelmiszer-adalékanyagokhoz kapcsolódó fogyasztói szokások vizsgálataÓnodi, Réka; Ungai, Diána; DE--Mezőgazdaság- Élelmiszertudományi és Környezetgazdálkodási KarSzakdolgozatom témájául az élelmiszer-adalékanyagokat választottam, amelyek napjainkban szinte már minden élelmiszer előállításához szükségesek. Szakdolgozatomban a különböző E-számokhoz tartozó fogalmak és típusok ismertetésén kívül szerettem volna körbejárni a hozzájuk tartozó fogyasztási szokásokat, véleményeket, technológiai szerepeket, és egyes adalékanyagokat részletesebben kifejteni. Célom volt még a vélt és valós félelmek feltérképezése.Ebben a témában végeztem egy kérdőíves kutatást, amelynek célja az volt, hogy felmérjem az átlagfogyasztók megítélését és ismeretét az adalékanyagokhoz kapcsolódóan, valamint szokásaikat különböző korosztályok szerint. Valamint az ismeretek terjesztésének módját valamint igényét. További célom volt a kutatás során a beérkezett adatok feldolgozása, kiértékelése, valamint a következtetések levonása.Tétel Korlátozottan hozzáférhető ADAPTATION AND MAINTAINING PROGRESS OF MANAGEMENT SYSTEM AT AN ENTERPRISE IN KYRGYZSTANLim, Angelina; Szőllősi, Nikolett; DE--Mezőgazdaság- Élelmiszertudományi és Környezetgazdálkodási KarOn the whole, this research investigates the practical implementation of two Kyrgyz companies—Semeynye Traditsii (ice cream maker) and Ak-Alman LLC (fish product manufacturer)—whose ISO 22000 and HACCP food safety management systems were observed in use. The topic was selected since, in emerging nations, worldwide food safety recommendations for small and medium-sized businesses (SMEs) become even more important. Both companies are under greater and more pressure to follow world standards as export and market credibility depend on it. Evaluating operational impact, understanding motivations, assessing certification readiness, and comparing challenges between the two businesses were the key objectives of the study. The study took a qualitative approach depending on in-depth interviews conducted between late 2024 and spring 2025. The two case study companies were selected according to varying degrees of ISO implementation. Semeynye Traditsii was in early planning whereas Ak-Alman LLC had completed internal audits and set ISO-compliant policies previously. Data was gathered via semi-structured interviews; they were then thematically evaluated and interpreted in view of ISO standards, internal control points, manufacturing quality, and strategic planning. Important findings revealed that Ak-Alman gained much from fast adoption supported by an experienced outside consultant. Among the quantifiable improvements the business accomplished were a 20–25% expansion in customer base and longer product shelf life. Semeynye Traditsii stressed laboratory modernization, improved traceability, and future certification as means of export expansion, though less developed in application. Neither company considered ISO as a formality; rather, it was a calculated investment. The main outcome of the comparison is that progressive integration of food safety culture, professional support, and leadership commitment define most of the achievement of ISO certification. The main advise is that Kyrgyz SMEs should consider artificial implementation strategies supported by continuous training and, if at all possible, access to certified outside consultants.Tétel Korlátozottan hozzáférhető Adsorbents as mitigators in the Transport System of Nitrogen in SoilSakiyo, Jesse John; Kovács, Elza; DE--Mezőgazdaság- Élelmiszertudományi és Környezetgazdálkodási KarWe will be investigating based on review the adsorption properties of Bentonite, Biochar and zeolite as possible soil absorbents. The three have the most extensive scientific findings to back them up. We will concentrate on the adsorption behaviors in this thesis by employing Freundlich and Langmuir equations, pseudo-first and second-order kinetic equations, and thermodynamic analysis, both of which are focused on various studies performed in previous research work. Excess ammonium NH4+treatment and neutralization of various hotspots such as agriculture and industrial areas are vital for improving groundwater quality and reducing atmospheric pollution. It has been discovered that affordable adsorbents were found to be efficient, and interesting NH3removing methods have been tested to see whether they can be enhanced. Despite the threats posed by carbon and clay pollution and energy supply, carbon dioxide and adsorption could serve as a potential hazard to the long-exposed entities. It could be dealt with using various techniques. NH4+concentrations, as opposed to inversing, have a positive outlook. I agree that removing low adsorption concentrations of sodium hydroxide from naturally occurring or secondary sodium bicarbonate. It is a sure path to ad-sorbing for products for use in NH3/NH4+concentrations.Tétel Korlátozottan hozzáférhető Advances and Prospects of Smart Packaging in Food Safety MonitoringZhou, Yantong; Béni, Áron; DE--Mezőgazdaság- Élelmiszertudományi és Környezetgazdálkodási KarThis thesis conducts a PRISMA-aligned scoping review (2015–2025) on smart packaging for food-safety monitoring, covering color indicators, gas sensors (O₂/CO₂/NH₃/H₂S), time–temperature indicators (TTIs), pathogen assays, and antimicrobial films. Evidence shows TTIs and gas-sensing labels deliver the most near-term operational value for cold-chain auditing, while antimicrobial films extend shelf life with migration and sensory trade-offs. Pathogen-focused labels achieve lab-level sensitivity but remain limited by matrix effects and workflow constraints, suggesting targeted use at critical control points. Techno-economic and life-cycle reasoning indicate benefits are strongest when waste reductions approach or exceed ~10%, and when deployment is integrated with HACCP and GS1-based traceability. Adoption hinges on calibration transfer, food-contact safety, and data-governance compliance (EU 1935/2004; 450/2009). Overall, the work specifies when and how smart packaging measurably improves safety, quality, and waste outcomes in real supply chains.Tétel Korlátozottan hozzáférhető Aflatoxin M1 level in milk in relation to fatty acid compositionKastrati, Shkëmb; Pusztahelyi, Tünde; DE--Mezőgazdaság- Élelmiszertudományi és Környezetgazdálkodási KarThe aim of this research was to see whether aflatoxin B1 intake affects fatty acid metabolism and, as a result, fatty acid composition in raw bovine milk. We have made the determination of milk fat percentage, percentage of fatty acids and found the correlation between each of them with AFM1 level. Enzyme-linked immune-sorbent assay (ELISA) was used as a method for the determination of AFM1 level in these samples. Based on the results we concluded that there was no connection between the presence of AFM1 in milk and fatty acids. The levels of AFM1 were unrelated to the other types of fatty acids present in these milk samples.Tétel Korlátozottan hozzáférhető An overview of food safety standards and institutions in KenyaKamina, Barbra Wausi; Máthé, Endre; DE--Mezőgazdaság- Élelmiszertudományi és Környezetgazdálkodási KarFood safety in Kenya has great potential in being improved however it faces few hindrances such as lack of capital to boost small scale industries like in the suburban areas to ensure they can maintain high level of hygiene. In addition to this there is also the issue of lack of consumer awareness which means that the public do not have the knowledge of proper food hygiene and this is one of the major causes of food borne diseases. Based on the analysis we can see that one of the common threats to food safety is corruption. Corruption is a common thing in most African countries, and this leads to production of low quality products as the laws are not being implemented. In my opinion harsh fines or more strict laws should be implemented in order to curb this situation. The respective governments should also increase the wages of the various institutions to reduce the corruption rate.Tétel Korlátozottan hozzáférhető Analisis of nutrient content of different poultry manure solutionsRodriguez Murcia, Oscar Javier; Nagy, Péter Tamás; DE--Mezőgazdaság- Élelmiszertudományi és Környezetgazdálkodási KarThe General objective of this research was to determine the optimal tea compost making process taking into accountratio dilution, time and temperature for increasethe availability of nutrients in soil, by analysing the effects of three different temperature and three different brewing times on thenutrient available concentration (nitrate (NO3-), Ammonium (NH4+), Potassium (K+), Phosphorus (PO43-)) and pH.Theresearchtook place in the laboratoryfacilities of the Institute of water and environmental managementof the University of Debrecen from February of 2020. Where Granulated poultry manure was obtained from a commercial supplier, by mixing this based material with distilled water, 3 different Compost tea solution were analysed.Tétel Korlátozottan hozzáférhető Analysing the effects and relationship of the pandemic in food waste Generation in European countriesAlzeidi, Narjis; Magyar, Tamás; DE--Mezőgazdaság- Élelmiszertudományi és Környezetgazdálkodási KarThis thesis conducts a comprehensive analysis of the dynamics of food waste and loss (FWL) along the international food value chain, highlighting their severe impacts on the environment, society, and economy. It makes a clear distinction between Food Waste (FW) and Food Loss (FL), proposing specific mitigation strategies for each category. The research indicates that annually, approximately 1.3 billion tonnes of food, which represents one-third of all food produced for human consumption, is discarded.Tétel Korlátozottan hozzáférhető Analysis and Risk Assessment of Heavy Metal Contamination in Fresh ProduceMohd Amran, Muhammad Alsyahid Bin; Béni, Áron; DE--Mezőgazdaság- Élelmiszertudományi és Környezetgazdálkodási KarThis thesis focuses on heavy metal contamination in fresh produce sold in Debrecen, Hungary, with a specific focus on apples, carrots, and lettuce. The concentrations of lead (Pb), cadmium (Cd), and chromium (Cr) were measured and compared to European Union safety limits by using Graphite Furnace Atomic Absorption Spectrometry (GFAAS). The results showed that apples from Kispiac and carrots from Aldi contained lead levels exceeding EU thresholds, while cadmium and chromium remained within safe ranges. A health risk assessment based on the Target Hazard Quotient (THQ) indicated that Kispiac apples posed a potential health risk due to lead exposure. In addition, nutrient analysis revealed excessive potassium and sodium levels in some samples are due to unsustainable farming practices. The study highlights the urgent need for stricter monitoring, improved agricultural management and sustainable farming practices to ensure food safety.Tétel Korlátozottan hozzáférhető Analysis of GEBV (Genomic Estimated Breeding Value) in Hungarian BullsDamai, Ray Gian Muhammad Fajar; Novotniné Dankó, Gabriella; Posta, János; DE--Mezőgazdaság- Élelmiszertudományi és Környezetgazdálkodási KarThis thesis aims to evaluate the GEBV score based on linear traits. The research resulted that GEBV muscularity was strongly related to production traits, and the GEBV growth rate was strongly related to the average daily gain of the cattle. Furthermore, the reproduction performance was analyzed using a correlation test, and only GEBV of easy calving and a pelvic inner diameter were significantly correlated with rump width. The research also tested a correlation between birth of the year and origins of the animals. Origins significantly high influenced production and reproduction performance such as easy calving, muscularity, body score, and bone fineness. Meanwhile, the correlation of birth year with growth rate, muscularity, and pelvic inner diameter is relatively low.Tétel Korlátozottan hozzáférhető Analysis of maize nutritional status exposed to abiotic stresses based on uav monitoring systemKgopa, Lucky Madimetja; Radócz, László; Bojtor, Csaba; DE--Mezőgazdaság- Élelmiszertudományi és Környezetgazdálkodási KarThe research was aimed at analyzing the nutritional status of Maize exposed to abiotic stresses using Unmanned Aerial Vehicle (UAV). The experiment was conducted at Látókép Crop Production Experiment Site of the University of Debrecen, Hungary. Treatments of nitrogen were applied in both irrigated and none-irrigated fields. Huge connection was noticed for the NGRDI, RGBVI and VARI records with the nitrogen content, which embraces them as suitable in distinguishing proof of the nourishing status of corn concerning nitrogen. The outcomes showed that cultivating maize with a water shortage without a huge lessening in yield was incomprehensible.Tétel Korlátozottan hozzáférhető Analysis of multifunctional shelterbelt system in organic farmGantulga, Tsogzolmaa; Nagy, Attila; DE--Mezőgazdaság- Élelmiszertudományi és Környezetgazdálkodási KarThis thesis is about multifunctional shelterbelt tree system on organic farm. Shelterbelt tree is supposed to reduce wind impact and accomplish micro climatic condition on the field. As a sequence, soil organic matter content and yield precentage demonstrates higher figure comparing with outer hedgegrow. . In order to confirm theoretical background, I have tried to look forwardsimilar researches in other regions of world such as Canadian shelterbelt system in arid condition. Above thesis is about to research efficient protective way of multifunctional shelterbelts system to crop and environment by investigating wind dynamics and soil characteristics. While I am writing my thesis, I have used factual research method, expert analysis method to clarify reasoning of establishing micro climatic condition.Tétel Korlátozottan hozzáférhető Analysis of physical-chemical properties of two types of dietary fiber enriched steamed bread and their applicationZhang, Miaomiao; Máthé, Endre; DE--Mezőgazdaság- Élelmiszertudományi és Környezetgazdálkodási KarCorn flour added and psyllium husk enriched steamed bread. The healthy effect on humen beeings of corn stuff. The high fiber content food product is good for people. Soft food stuff for the elder groups.Tétel Korlátozottan hozzáférhető Analysis of physico-chemical composition, nutritional impact, and health risk assessment of rosé wines from different Hungarian wine regionsRivera, Geremie; Czipa, Nikolett; DE--Mezőgazdaság- Élelmiszertudományi és Környezetgazdálkodási KarThe objective of this study was to analyse the physico-chemical composition, nutritional impact, and health risk assessment of rosé wines manufactured from Hungarian wine regions: Balatonboglár, Eger, and Villány. The parameters measured were pH, sugar content, total phenolic content (TPC), flavonoid content (FC), and element content (Ca, K, Mg, Na, P, S, Al, B, Ba, Cu, Fe, Mn, Sr, Zn). The highest pH, sugar content, TPC, and FC were measured in Balatonboglár wines, as well as the highest concentrations for K, Mg, Na, Al, Mn, and Sr. Eger wines obtained the highest Ca, B, and Ba contents, whereas Villány wines showed the highest P, S, Cu, Fe, and Zn contents. None of the rosé wine samples presented significant health risks based on the risk assessment.Tétel Korlátozottan hozzáférhető Analysis of physio-chemical properties of Hungarian monofloral honey typesKhan, Ahzam Afnan; Czipa, Nikolett; DE--Mezőgazdaság- Élelmiszertudományi és Környezetgazdálkodási KarThis thesis is about Analysis of physio-chemical properties of Hungarian monofloral honey types. Determining pH, diastase activity, sugar & moisture content, proline content, electrical conductivity, total phenolic content. honey types are acacia honey, Sunflower honey, Forest honey, linden honey, rape honey collected from various counties of Hungary.Tétel Korlátozottan hozzáférhető Analysis of quality problems of geographically marked agricultural products in Türkiye: Malatya apricot exampleOzkan, Fusun Zehra; Pusztahelyi , Tünde; DE--Mezőgazdaság- Élelmiszertudományi és Környezetgazdálkodási KarToday, it has gained great importance to determine the food safety and quality parameters of local products and to solve quality problems for these products to increase the number of consumers who attach importance to food safety and adopt a healthy lifestyle, to prefer local products first and to protect local products against imitations and not to expose them to unfair competition. Türkiye is a very rich country in terms of the diversity of local products. Malatya apricot, one of these products, is a local product that has the highest export share in Türkiye and meets 48.7% of Türkiye's total apricot production. It is also one of the first agricultural products to receive geographical indication in Türkiye and the European Union. Agricultural products such as Malatya Apricots have special characteristics determined by geographical factors originating from their production areas. In addition to preserving these qualities, structuring the production and processing activities of these products under controlled conditions regarding food safety and quality is of great importance for all interested parties, especially manufacturers. In this research, Malatya apricots, which are grown in and around Malatya province and are a geographically indicated product, are purchased as dry or fresh to preserve the characteristics determined during the registration process and to determine the quality problems that arise in the production, processing and storage processes, taking into account these features and other necessary conditions. A questionnaire was conducted with an equal number of businesses that have and do not have a geographical indication contract that receives and processes geographical indications, their awareness level, use, quality problems in the production, processing, storage and marketing processes of Malatya apricots, audits and whether there is a need for a certification program. According to the results of this research, it is recommended to implement a product certification program to solve the quality problems experienced for agricultural products that receive geographical indications, to ensure compliance of our local products with quality criteria and to provide safe and high-quality products for consumers in domestic and foreign markets. The quality problems and suggested solutions for Malatya apricot will also provide data for the quality problems and certification activities of other geographically indicated agricultural products in Türkiye.