
Juan Carlos Bravo YagüeNational University of Distance Education | UNED · Department of Analytical Sciences
Juan Carlos Bravo Yagüe
PhD Chemistry
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Publications
Publications (38)
The economic significance of the shrimp industry relies heavily on the comprehensive utilization of all of the shrimp’s parts. However, this importance is often threatened by common challenges such as disease and pollution, caused by prominent contaminants that are capable of exerting adverse effects either directly as physical pollutants or indire...
This research aims to study the effects of ultraviolet C (UVC) radiation on low-density polyethylene (LDPE) food packaging. Main objectives include evaluating LDPE degradation and detecting UVC radiation using thermoluminescent dosimeters (TLDs) placed under LDPE samples. Results confirm accurate UVC detection after one hour of exposure, providing...
In this research, a molecularly imprinted polymer (MIP) was synthesized by precipitation polymerization using oxazepam (OZ) as a template molecule and was subsequently applied as a selective sorbent for the extraction of diazepam (DZP) and its metabolites in urine samples using an SPE cartridge. OZ, temazepam (TZ), nordiazepam (NZ) and DZP were ana...
The interaction between ultraviolet C radiation (UVC) and polystyrene (PS) materials has been investigated,
particularly in post-packaging irradiation processes for healthcare applications. Effective UVC penetration
through PS materials, regardless of their thickness (0.16 and 0.40 mm) has been observed. However, the
penetration effectiveness co...
Microplastics (MPs) and nanoplastics (NPs) are widely spread in the environment, generating significant concern due to their potential impact on environmental health. Marine species usually ingest plastic fragments, mistaking them for food. Many toxic compounds, such as plastic additives that are not chemically bound to the plastic matrix, can be r...
This paper describes a new methodology for carrying out quantitative extraction of cloxacillin from drinking and river water samples using a molecularly imprinted polymer (MIP) as a selective sorbent for solid-phase extraction (MISPE). Several polymers were synthesized via thermal polymerization using cloxacillin as a template, methacrylic acid (MA...
This paper reports on the luminescence characterization of TLD-100 (LiF: Ti, Mg), TLD-200 (CaF2:
Dy), TLD-400 (CaF2: Mn) and GR-200 (LiF: Mg, Cu, P) dosimeters exposed to electro beam, beta
and ultraviolet C radiation -UVC-. All of them show high sensitivity to radiation regardless of
whether it is ionizing or partially ionizing radiation based on...
2019): Analysis of total arsenic content in purchased rice from Ecuador. Czech J. Food Sci., 37: 00-00. Abstract: Natural and anthropogenic sources contribute to arsenic contamination in water and human food chain in Andean countries. Human exposure to arsenic via rice consumption is of great concern in countries where this crop is the dominant sta...
The presence of estrogens in environmental waters can cause adverse effects to aquatic organisms. In the last years, diverse researches have been focussed on the development of cost-effective methods for the removal of these compounds in water. In this paper, a series of methacrylic acid-ethylene glycol dimethacrylate polymers with different monome...
Distance education programs in higher education are gaining popularity mostly due to the flexibility of the formative programs to fit all the requirements that brick-and-mortar educational institutions are not able to provide to students. However, quite often these distance programs report feelings of isolation, lack of self-direction and managemen...
La Educación a Distancia en el ámbito universitario está ganando relevancia, en parte debido a la flexibilidad de sus programas formativos que permiten soslayar las restricciones de espacio-tiempo de los programas presenciales. Sin embargo, estos programas pueden generar sentimientos de aislamiento y una disminución de la motivación. El uso de meto...
En los últimos años, y en el marco de las distintas Convocatorias de Redes de
Investigación en Innovación Docente, se han desarrollado nuevos materiales y
recursos, implementando nuevas estrategias, y mejorando el proceso enseñanzaaprendizaje
en la UNED. En el área de las Ciencias Experimentales la utilización de
métodos de enseñanza activos (resol...
New analytical strategies tend to automation of sample pre-treatment and flow analysis techniques provided a number of enhanced analytical methods allowing high throughput. Flow techniques are usually faster, more robust and more flexible than their batch equivalents. In addition, flow methods use less sample and reagent amounts and reduce analytic...
des europeas, sitúa el desarrollo de competencias como elemento central de la planificación metodológica, siendo los métodos de enseñanza y las estrategias de evaluación a utilizar orientados en función de los objetivos de aprendizaje que el estudiante debe conseguir. En el contexto de la Enseñanza a Distancia, algunos de los métodos de enseñanza m...
Most books published on the flow injection analysis (FIA) of food additives focus mainly on the theoretical basis and principles of FIA and on the design of equipment, instrumentation, manifold, setting mechanism, etc. This book provides an in-depth critical analysis of the use of FIA methods and the possibilities that it offers for determining a v...
https://books.google.es/books?hl=es&lr=&id=M43wCgAAQBAJ&oi=fnd&pg=PA411&ots=UOx5eHfEOj&sig=zm5sFG1-4t-AMqhWLmqALwZUI1Q#v=onepage&q&f=false
In thelastdecades,theassessmentofpolycyclicaromatichydrocarbons'exposurehasgeneratedgreat
interestand1-hydroxypyrene(1-OHP)hasbeencommonlyusedasabiologicalindicatorofexposureto
PAHsinmanystudiesinenvironmentalandoccupationalhealth.Inthisresearch,amolecularly
imprinted polymer(MIP)wassynthesisedbyprecipitationpolymerisationusing1-OHPastemplate,
meth...
In the last decades, the assessment of polycyclic aromatic hydrocarbons' exposure has generated great interest and 1-hydroxypyrene (1-OHP) has been commonly used as a biological indicator of exposure to PAHs in many studies in environmental and occupational health. In this research, a molecularly imprinted polymer (MIP) was synthesised by precipita...
El cambio metodológico que implicaba la adaptación al Espacio Europeo de Enseñanza Superior (EEES) nos abocó, en su momento, a la búsqueda de nuevas herramientas de enseñanza-aprendizaje destinadas a desarrollar las competencias genéricas y específicas de los estudiantes. También, al diseño de nuevas fórmulas para posibilitar la evaluación continua...
Estradiol is the major steroid hormone which is involved in several organic functions, such as physiological sexual behavior, development and maintenance of male and female reproductive organs, control of visceral secretion, modulation of immune system, and tumorigenesis. In this compilation, the authors discuss the synthesis, health effects and dr...
Honey attributes such as geographical origin or specified botanical sources often command a premium price due to their organoleptic or pharmacoactive properties. "Miel de Granada" is a highly quality product with protected designation of origin (PDO) which includes six monofloral honeys and two multifloral honeys. Our objective was the characteriza...
The concentration, distribution and fractionation of metals in a metal spiked soils were studied using a Multi-Species-Soil-System (MS·3), a terrestrial microcosms that allows a combined assessment of the chemical fate and effects on terrestrial organisms. Samples of a natural soil were spiked with a mixture of the metals Cd, Co, Cr, Cu, Mn, Ni, Pb...
In this work we have developed a cost-effective method for the analysis of methyl mercury (MeHg) in seawater fish muscle. The novelty of this method lies in the use of microwave-assisted extraction with acidic solution (HCl), addition of toluene, and subsequent extraction with cysteine acetate solution where only MeHg is present because of its affi...
A selective on-column molecularly imprinted solid-phase extraction (MISPE) for ethynylestradiol (EE2) from water samples was developed. Following a non-covalent molecular imprinting approach, two molecularly imprinted polymers (MIPs) have been synthesised using methacrylic acid (MAA) as functional monomer, ethyleneglycol dimethacrylate (EGDMA) as c...
The estrogenic compound diethylstilbestrol (DES) is widely studied because of its potential endocrine disruption effects. The prohibition of the use of diethylstilbestrol as a growth promoter has not been enough to ensure the total disappearance of this compound from environmental matrices. Due to the low levels of DES present in the environment, p...
En el presente estudio se han analizado lasconcentraciones de dos metales pesados (Hg y Pb) en el tejidohepático de dos especies de aves marinas (cormorán moñudo,Phalacrocorax aristotelis, y alcatraz, Morus bassanus), empleandopara ello animales aparecidos muertos o moribundos a lo largo de lacosta de Galicia. Los ejemplares considerados fueron div...
The steroidal compound 17beta-estradiol (E2) is a major estrogen now widely studied because of its potential endocrine disruption effects. The present paper describes a simple, rapid, flow injection (FI) method for the fluorimetric determination of beta-estradiol involving a molecularly imprinted polymer (MIP) packed into a microcolumn. Microwave-a...