Persona: Fernández Hernando, Pilar
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Fernández Hernando
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Publicación El agua, fuente de vida y de problemas(Universidad Nacional de Educación a Distancia (España). Facultad de Ciencias, 2009-01-01) Fernández Hernando, PilarPublicación Nuevos materiales: Biomateriales; investigación en permanente desarrollo(Universidad Nacional de Educación a Distancia (España). Facultad de Ciencias, 2003-01-01) Jorge Herrero, Eduardo; Fernández Hernando, PilarPublicación Assessment of molecularly imprinted polymers as selective solid-phase extraction sorbents for the detection of cloxacillin in drinking and river water(MDPI, 2023-11-03) Collado, Eduardo José; Paniagua González, Gema; Bravo Yagüe, Juan Carlos; Fernández Hernando, Pilar; Garcinuño Martínez, Rosa MªThis 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 (MAA) as a functional monomer, ethyleneglycoldimethacrylate (EGDMA) as a cross-linker and different solvents as porogens. Binding characteristics of the adequate molecularly imprinted and non-imprinted (NIP) polymers were evaluated via batch adsorption assays following the Langmuir and Freundlich isotherms and Scatchard assays. The parameters related to the extraction approach were studied to select the most appropriate polymer for cloxacillin determination. Using the optimized MIP as the SPE sorbent, a simple sample treatment methodology was combined with high-performance liquid chromatography (HPLC) to analyze cloxacillin residues in drinking and river water. Under the optimum experimental conditions, the MISPE methodology was validated using spiked samples. The linearity for cloxacillin was assessed within the limits of 0.05–1.5 g L1 and the recovery percentage was higher than 98% (RSD < 4%). The limits of detection and limits of quantification were 0.29 and 0.37 g L1 and 0.8 and 0.98 g L1 for drinking and river water, respectively. The selectivity of MIP against other ß-lactam antibiotics with similar structures (oxacillin, cefazoline, amoxicillin and penicillin V) was studied, obtaining a good recovery higher than 85% for all except cefazoline. The proposed MISPE-HPLC methodology was successfully applied for the detection of cloxacillin in drinking water from Canal de Isabel II (Madrid) and river water from the Manzanares River (Madrid).Publicación Evaluation of total phenol pollution in water of San Martin Canal from Santiago del Estero, Argentina.(Elsevier, 2018-05) Acosta Rosales, Carina Andrea; López, Clara; Paniagua González, Gema; Garcinuño Martínez, Rosa Mª; Fernández Hernando, PilarSantiago del Estero is a province located in northwestern Argentina. The Dulce River is used for irrigation through a vast network of channels and ditches, including the San Martin Canal (SMC), which crosses the capital city of Santiago del Estero. This canal's water is used for drinking, as well as recreational use for the general population. However, this river has been seriously polluted for several decades. The present study focuses on the identification and the quantification of the water pollution levels of total phenols in the SMC according to the seasonal periods. Water samples from various areas of the canal in different months of the year, extending from December to September, were collected for analysis. Additionally, the concentration of total dissolved solids (TDS), chlorides, sulphates, nitrites and organic matter, as well as water hardness and alkalinity, were analysed in order to conduct a more complete study of the contamination of this area. The results showed a worrying total phenol concentration that exceeded the limit set by Argentine legislation for drinking water, as well as water for recreational use (5 μg/L). The total phenol (TP) concentration was directly determined by a molecular absorption spectroscopy method based on a new flow injection analysis system (FIA). Under the selected experimental conditions, the detection and quantification limits were 0.0490 and 0.1633 μg/mL, respectively. The developed method provides a number of improvements related to the speed of analysis, the restricted consumption of the reagents and sample volumes and the unnecessary sample treatment that contribute to environmentally friendly analytical chemistry. The results showed that TP make a significant contribution in the SMC pollution, especially during the months of April (400 ± 110 μg/L) and September (240 ± 20 μg/L). A high sulphate concentration that was higher than the limit allowed by the legislation was also found.Publicación Semblanzas de los Premios Nobel 2002: El Nobel de Química en tres continentes(Universidad Nacional de Educación a Distancia (España). Facultad de Ciencias, 2003-01-01) Fernández Hernando, PilarPublicación A systematic review of methods of analysis for plastic additives in fisheries and aquaculture products(Taylor & Francis, 2025-02-06) Esther Garrido Gamarro; Garcinuño Martínez, Rosa Mª; Paniagua González, Gema; Fernández Hernando, Pilar; Organización de las Naciones Unidas para la Alimentación y la Agricultura (FAO); Universidad Nacional de Educación a DistanciaMicroplastic particles have been found in a variety of food commodities, and fisheries and aquaculture products seem to be one of the main contributors to the dietary exposure of microplastics, which are complex mixes of chemicals, containing polymers, plastics additivities, and environmental contaminants. The implications for food safety are not well understood. The lack of simple and efficient analytical techniques for the determination of microplastics as well as their additives in food are some of the challenges. To improve the understanding of the methods available for the determination of plastic additives, a systematic literature review was conducted focusing on methods to determine those plastic additives known for their possible endocrine disruption and/or carcinogenic activity, such as bisphenol A (BPA), bisphenol F (BPF), bisphenol S (BPS), 4- nonylphenol (NP-4), nonylphenol (NP), diethyl phthalate (DEP), di-n-butyl phthalate (DBP), di(2-ethylhexyl)phthalate (DEHP), and polybrominated diphenyl ether (PBDE) in fisheries and aquaculture products. The review aimed to identify the most common extraction and determination methods used for these analytes and assess their efficiency. The findings of this review shed light on the current state of analytical methodologies in this field and provide insights that could inform and guide further research.Publicación Methacrylic acid-ethylene glycol dimethacrylate polymeric sorbent for the removal of estrogens from water(['Estrogens', 'Removal', 'Polymer', 'Sorbent', 'Waters', 'Balaban Publishers – Desalination Publications'], 2018-11) Gallego, Alejandrina; Bravo Yagüe, Juan Carlos; Paniagua González, Gema; Fernández Hernando, Pilar; Garcinuño Martínez, Rosa MªThe 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 monomers ratio were synthesised by photochemical (UV irradiation at 365 nm) or thermal (oven at 60°C) initiation. Batch and continuous flow experiments were carried out to evaluate the capacity of these polymers to adsorb estradiol (E2), ethinylestradiol (EE2) and dienestrol (DEN). Adsorption isotherm studies revealed that Langmuir isotherm model was fitted with a better correlation than Freundlich isotherm. Finally, continuous flow experiments were carried out by microcolumn studies to check the suitability of the polymeric sorbent for the removal of estrogens from real water samples. When continuous removal experiments at 8 mL min–1 flow rate were carried out, breakthrough adsorption capacities of 28.5, 38 and 69.7 mg g–1 for E2, EE2 and DEN, respectively, were achieved.Publicación Semblanzas de los Premios Nobel 2009 : en Química(Universidad Nacional de Educación a Distancia (España). Facultad de Ciencias, 2010-01-01) Fernández Hernando, PilarPublicación Premio Nobel de Química 2005(Universidad Nacional de Educación a Distancia (España). Facultad de Ciencias, 2006-01-01) Fernández Hernando, PilarPublicación Characterization of Plastics Ingested by the Bioindicator Cory’s Shearwater from Tenerife Island (Canary Islands): Implications for Marine Environmental Monitoring(MDPI, 2025-11-03) Baena, Natalia; Paniagua González, Gema; Bravo Yagüe, Juan Carlos; Garcinuño Martínez, Rosa Mª; Rodríguez, Beneharo; Jiménez, Begoña; Fernández Hernando, Pilar; Muñoz Arnanz, Juan; Agencia Estatal de Investigación (España); Universidad Nacional de Educación a Distancia (UNED)Plastic pollution is a pressing environmental concern globally, especially in marine ecosystems. In this study, the evaluation of the potential ingestion of plastic, mostly in the form of microplastics (MPs), by fledglings of Cory’s shearwaters (Calonectris borealis) from the Canary Islands (Spain) was conducted. The total number of plastics found in the stomach samples was 674, primarily comprising large MPs (1–5 mm: 82%), followed by mesoplastics (>5–25 mm: 18%). The predominant morphology was threadlike (31.6%), followed by hard, irregularly shaped fragments (28.3%), microspheres (22.4%), and sheets (15.7%). Loads were found to overlap with those described for the same species in highly populated areas such as the Mediterranean Sea. Plastic counts above Cory’s threshold value may suggest poor environmental status for the Canary Current region. FTIR-ATR analysis evidenced the predominance of polyethylene (PE) (46.7%), polypropylene (PP) (24.6%) and polyamide (PA) (20.4%). This is likely linked not only to the fact that PE is the most produced plastic worldwide, but also the fact that, along with PP, it makes up the highest amount of single-use plastic products. Overall, findings provide a contamination-controlled, FTIR-verified baseline for fledglings from Tenerife; however, given the limited, single-season sample (n = 33) and opportunistic design, results are descriptive and not intended for population-level inference. Yet, the potential of Cory’s shearwater as a sentinel species to monitor plastic pollution is highlighted, emphasizing the urgent need for effective mitigation strategies to address plastic pollution in marine environments.