Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 47 for “"Bioaccessibility"”.
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Microplastics as Contaminant Vectors: Influencing the Bioaccessibility of Naphthalene from Freshwater
… the sorption mechanisms of naphthalene and its bioaccessibility (i.e., an estimate of the fraction of an ingested dose that becomes soluble in gastro-intestinal fluids). Three types of MPs, medium-density polyethylene (MDPE), polypropylene (PP), and polystyrene (PS), were selected as model …
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Bioaccessibility of Metals in Soils of Parks and Playgrounds – Fort McMurray, Alberta
This study assessed the concentration and bioaccessibility of metals present in soils at parks and playgrounds in Fort McMurray, Alberta. Sixty soil samples collected from 20 parks and playgrounds were analyzed for pH, total metal concentration by X-ray fluorescence. In addition, in vitro …
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Bioaccessibility and metabolism of anthocyanins: effects of fermentation, encapsulation, and microbiota interactions
… benefits; however, these compounds exhibit low bioaccessibility and bioavailability due to degradation and limited absorption in the gastrointestinal tract, which may restrict their effects. Therefore, innovative strategies to enhance the stability and maximize the benefits of anthocyanins are …
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Understanding the Influence of Zinc on Grain Cadmium Accumulation and Bioaccessibility in Rice
… on cadmium, zinc, and essential mineral bioaccessibility in three lines of rice that differ in grain cadmium concentration </strong></p> <p>Diets high in cadmium (Cd) and low in zinc (Zn) threaten human health. While both are detrimental to the well-being of millions globally, diets …
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The impact of plant root biomass on the biodegradation and bioaccessibility of hydrocarbons in soil
… within root exudates on the biodegradation and bioaccessibility of phenanthrene from soil with particular interest in the study of root-induced changes of hydrocarbon bioaccessibility. Results showed that microbial catabolism and biodegradation of 14C-phenanthrene can be promoted by the …
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Characterization of antioxidant activities of soybeans and assessment of their bioaccessibility after in vitro digestion
… or nutraceutical products processed for better bioaccessibility of soybean bioactive components.
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Concentrations and In Vitro Bioaccessibility of Metals in Soils at Urban Green Spaces in Toronto, Ontario
… spaces within the City of Toronto. In vitro bioaccessibility was determined in eight of the samples as a surrogate for bioavailability. The mean concentrations of metals of interest, As, Cr, Cu, Ni, Pb, and Zn were below the Canadian Council of Ministers of the Environment (CCME) soil quality …
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Investigation of how oral bioaccessibility of potentially toxic elements in urban soils is affected by contaminant source and sampling techniques
… in unnecessary remediations. Therefore, in vitro bioaccessibility tests are applied to estimate the bioavailable contaminant fraction providing more precise information.<br/><br/>However, the controlling factors over PTEs bioaccessibility in urban soils are not adequately understood. This research …
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An investigation of the distribution, fractionation and bioaccessibility of potentially toxic elements in urban soils of Lagos, Nigeria
… BCR sequential extraction, and the simplified bioaccessibility extraction test (SBET) were applied to the soils. The analytes Cr, Cu, Fe, Mn, Ni, Pb and Zn were determined in soil extracts and digests by ICP-MS.Mean pseudototal PTE concentrations at locations remote from point sources of …
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Spatial and statistical analysis approaches to investigate the oral bioaccessibility of potentially toxic elements in Northern Irish soils
… fraction of a soil contaminant. Measuring oral bioaccessibility in vitro can be an acceptable estimate of contaminant oral bioavailability, eliminating the need for in vivo toxicology studies to estimate health risks from oral soil contaminant exposure.<br/><br/>Using soil samples from the …
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Microstructural changes and micronutrient bioaccessibility in soft-solid foods, using a model fresh cheese and in vitro digestion
… parameters, and its relationship with the bioaccessibility of liposoluble vitamins through in vitro digestion. There were two specific aims to accomplish the overall objective. The first aim was to evaluate the structure and microstructure of the soft solid matrix, using a model fresh …
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Characterizing the Binding Potential, Activity, and Bioaccessibility of Peroxisome Proliferator Activated Receptor Gamma (PPARγ) Ligands in Indoor Dust
… it is essential that one also investigates the bioaccessibility and bioactivation of these chemicals following ingestion. </p><p> In the first research aim of this thesis, the bioaccessibility and bioactivation of several important SVOCs in house dust was investigated. To accomplish this, Tenax …
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Impacts of wildfire activity in the wildland-urban interface on environmental mobilization and bioaccessibility of nanoscale trace metals, The
… the environmental lability and pulmonary bioaccessibility of ash from structures burned in the Marshall Fire, a WUI wildfire that burned over 1000 structures in Boulder Country, Colorado. Exposure to WUI ash impacts a range of people, including first responders and residents. In the first …
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Extraction methods for assessing the bioaccessibility of potentially toxic elements in urban airborne particulate matter by inductively coupled plasma mass spectrometry
… develop and assess the suitability of simplified bioaccessibility extraction test (SBET) and the stomach phase of unified bioaccessibility method (UBMSG) to measure bioaccessible PTE in PM10 collected on filter dynamic measurement system (FDMS) filters used worldwide. Analytes were As, Cd, Cr, Cu, …
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Characterising the techno- and bio-functional properties of milk protein-polyphenol complexes for application in performance nutrition
… stability of casein micelles, heat stability, bioaccessibility and bioavailability) of liquid dairy systems. In these studies, the addition of polyphenols to systems containing casein micelles increased the attractive forces within the casein micelles, due to complex formation, preventing …
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Investigating the Transformations of Arsenic and Toxic Metal(Loid)S Speciation and the Impact on Arsenic Bioaccessibility in Particulate Matter from Mine Tailings Sites Distributed in Different Climates
… weathering, geochemical speciation, and bioaccessibility of arsenic (As), lead (Pb), zinc (Zn), and cadmium (Cd) in sulfidic mine tailings collected from 11 abandoned sites across a broad climatic gradient in the Western United States, ranging from arid to humid environments. Tailings …
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Physico-chemical Characteristics and Environmental Fate of a Hydrolytically Degradable Cationic Flocculant
… tests (PBETs) were developed to estimate the bioaccessibility of poly(PLA4ChMA) and naphthalene; i.e., the fraction of a contaminant solubilized in GI fluids and available for systemic absorption. Extracts were analyzed by 1H-NMR, gravimetry, and ultraviolet-visible spectrophotometry. Both …
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Soil Metal Distribution in Parks and Playgrounds in Select Municipalities in Metro Vancouver
… (SQG) for residential/parkland use. In vitro bioaccessibility analyses were also conducted to determine the human health risk associated with ingestion of metals present in the soil samples. Metal concentrations and the bioaccessibility results suggested that the human health risk associated …
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Environmental risk assessment for an informal e-waste recycling site in Lagos State, Nigeria
… such as rainfall were assessed. In recent times, bioaccessibility has emerged as a testing tool used to accurately estimate the risk posed on human health by exposure to environmental contaminants, the oral bioaccessibility and inhalation bioaccessibility was also assessed. The concentrations of …
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