Agüí Chicharro, María Lourdes

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First Name
María Lourdes
Last Name
Agüí Chicharro
Universidad Complutense de Madrid
Faculty / Institute
Ciencias Químicas
Química Analítica
Química Analítica
UCM identifierScopus Author IDDialnet ID

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Now showing 1 - 7 of 7
  • Publication
    Implementación de la metodología flipped classroom en los laboratorios de Química Analítica
    (2023-05-31) Reviejo García, Ángel Julio; Agüí Chicharro, María Lourdes; Campuzano Ruiz, Susana; Gamella Carballo, Maria; García Martín, Ángel Felipe; González Cortés, Araceli; Guerrero Blanco, José Ignacio; Mateos Briz, María Raquel; Miguel Bravo, María; Pérez Ginés, Víctor; Reviejo Martínez, Eva; Romano Martín, Santiago; Ruiz-Valdepeñas Montiel, Víctor; Sánchez Tirado, Esther; Santiago Sáez, Andrés Sebastián; Serafín González-Carrato, Verónica; Torrente Rodríguez, Rebeca Magnolia; Yáñez-Sedeño, Paloma; Pedrero Muñoz, María
    Adaptar el sistema tradicional de aprendizaje a las necesidades actuales del alumnado empleando la metodología flipped classroom en el laboratorio de Química Analítica I, con el objetivo de fomentar el aprendizaje utilizando herramientas digitales.
  • Publication
    Electrochemical (Bio)Sensing Devices for Human-Microbiome-Related Biomarkers
    (MDPI AG, 2023) Sánchez-Tirado, Esther; Agüí Chicharro, María Lourdes; González-Cortés, Araceli; Campuzano Ruiz, Susana; Yáñez-Sedeño, Paloma; Pingarrón Carrazón, José Manuel
    The study of the human microbiome is a multidisciplinary area ranging from the field of technology to that of personalized medicine. The possibility of using microbiota biomarkers to improve the diagnosis and monitoring of diseases (e.g., cancer), health conditions (e.g., obesity) or relevant processes (e.g., aging) has raised great expectations, also in the field of bioelectroanalytical chemistry. The well-known advantages of electrochemical biosensors—high sensitivity, fast response, and the possibility of miniaturization, together with the potential for new nanomaterials to improve their design and performance—position them as unique tools to provide a better understanding of the entities of the human microbiome and raise the prospect of huge and important developments in the coming years. This review article compiles recent applications of electrochemical (bio)sensors for monitoring microbial metabolites and disease biomarkers related to different types of human microbiome, with a special focus on the gastrointestinal microbiome. Examples of electrochemical devices applied to real samples are critically discussed, as well as challenges to be faced and where future developments are expected to go..
  • Publication
    Monitoring autoimmune diseases by bioelectrochemical detection of autoantibodies. Application to the determination of anti-myelin basic protein autoantibodies in serum of multiple sclerosis patients
    (Elsevier, 2022-02-18) Guerrero Irigoyen, Sara; Sánchez Tirado, Esther; Agüí Chicharro, María Lourdes; González Cortés, Araceli; Yáñez-Sedeño Orive, Paloma; Pingarrón Carrazón, José Manuel
    This work reports an amperometric bioplatform for the determination of anti-myelin basic protein autoantibodies (anti-MBP), a relevant biomarker for multiple sclerosis (MS) autoimmune disease. The developed configuration involves the use of carboxylated magnetic microparticles (cMBs) where the protein for specific capture of the target autoantibodies was covalently attached. The immobilized anti-MBP were further conjugated with a secondary antibody labelled with horseradish peroxidase (HRP-anti-hIgG) and amperometric transduction was performed by adding hydrogen peroxide and using hydroquinone (HQ) as redox mediator. The cathodic current resulting from the reduction of the corresponding quinone was directly proportional to the logarithmic concentration of the target autoantibodies. The analytical performance of the developed method for the determination of anti-MBP is competitive in terms of sensitivity and range of linearity with that claimed for the only biosensor reported so far in the literature, as well as with commercially available ELISA kits showing a remarkably shorter assay time. The bioplatform was applied to the analysis of serum samples of healthy individuals and patients diagnosed with MS providing results in agreement with the ELISA methodology.
  • Publication
    Simultaneous determination of CXCL7 chemokine and MMP3 metalloproteinase as biomarkers for rheumatoid arthritis
    (Elsevier, 2021-07-09) Guerrero Irigoyen, Sara; Sánchez Tirado, Esther; Agüí Chicharro, María Lourdes; González Cortés, Araceli; Yáñez-Sedeño Orive, Paloma; Pingarrón Carrazón, José Manuel
    This paper reports the preparation of the first dual electrochemical immunosensor for the simultaneous determination of the CXCL7 chemokine and the MMP3 metalloproteinase as relevant biomarkers for the better diagnosis and monitoring of rheumatoid arthritis derived from the multiple biomarkers measurement. The developed immunosensor involves the use of carboxylated magnetic beads (MBs) and dual screen-printed carbon electrodes (SPdCEs). Sandwich-type configurations implied the covalent immobilization of specific anti-CXCL7 (cAb1) or anti-MMP3 (cAb2) capture antibodies onto MBs and the use of biotinylated detection antibodies with further labelling with HRP-Strept conjugates. The resulting MBS bioconjugates were magnetically captured on the respective working electrode of the SPdCE and the determination of the antigens was accomplished by measuring the amperometric responses of H2O2 mediated by hydroquinone (HQ) at a potential value of −0.20 V. The dual immunosensor provided calibration plots with linear ranges between 1 and 75 ng mL−1 (CXCL7) (R2 = 0.997) and from 2.0 to 2000 pg mL−1 (MMP3) (R2 = 0.998) with detection limits of 0.8 ng mL−1 and 1.2 pg mL−1, respectively. The assay took 2 h 20 min for the simultaneous determination of both biomarkers. The dual immunosensor was successfully applied to the analysis of human serum from positive and negative RA patients.
  • Publication
    Design of electrochemical immunosensors using electro-click chemistry. Application to the detection of IL-1β cytokine in saliva
    (Elsevier, 2020-02-14) Guerrero Irigoyen, Sara; Agüí Chicharro, María Lourdes; Yáñez-Sedeño Orive, Paloma; Pingarrón Carrazón, José Manuel
    Electro-click methodology was employed to prepare an electrochemical immunosensor for the cytokine interleukin 1β (IL-1β). The strategy involved binding of ethynylated IgG to azide-MWCNTs modified electrodes by Cu(I) catalyzed-cycloaddition reaction where the catalyst was electrochemically synthesized. This electro-click protocol is significantly faster and greener than the methods for catalyst generation through chemical reduction. The oriented immobilization of the capture antibody onto IgG-MWCNTs conjugates allowed the preparation of a sandwich-type immunosensor using biotinylated anti-IL-1β as detector antibody labeled with alkaline phosphatase-streptavidin (AP-strept). Differential pulse voltammetric transduction through the 1-naphthylphosphate/1-naphthol system was carried out. The analytical characteristics achieved with the electrochemical immunosensor showed a calibration curve exhibiting two linear ranges between 10 and 200 pg mL−1 (r2 = 0.998), and from 200 to 1200 pg mL−1 (r2 = 0.998), and a LOD value of 5.2 pg mL−1, an improvement compared with those claimed for commercial ELISA kits. In addition, the assay time was at least one hour shorter. Excellent performance was observed in the determination of IL-1β in saliva with no need for sample treatment, and by simple interpolation using a calibration plot constructed with standard solutions of the target cytokine.
  • Publication
    Development of an Electrochemical CCL5 Chemokine Immunoplatform for Rapid Diagnosis of Multiple Sclerosis
    (MDPI, 2022-08-07) Guerrero Irigoyen, Sara; Sánchez Tirado, Esther; Agüí Chicharro, María Lourdes; González Cortés, Araceli; Yáñez-Sedeño Orive, Paloma; Pingarrón Carrazón, José Manuel
    Serum level of CCL5 chemokine is considered an emerging biomarker for multiple sclerosis (MS). Due to the lack of specific assays for this disease, the development of a point-of-care test for rapid detection of MS could lead to avoiding diagnostics delays. In this paper, we report the first electrochemical immunoplatform for quantification of the CCL5 biomarker at the clinically required levels, able to discriminate between patients diagnosed with MS and healthy individuals. The immunosensing device involves protein capture from biological samples by complexation with biotinylated specific antibodies immobilized onto neutravidin-functionalized microparticles and sandwich assay with anti-CCL5 antibody and IgG labelled with horseradish peroxidase (HRP) for the enzyme-catalyzed amperometric detection of H2O2 using hydroquinone (HQ) as the redox mediator. The method shows excellent analytical performance for clinical application with a wide linear range of concentrations (0.1–300 ng·mL−1 CCL5, R2 = 0.998) and a low detection limit (40 pg·mL−1 CCL5). The biosensing platform was applied to the determination of the CCL5 endogenous content in 100-fold diluted sera both from healthy individuals and patients diagnosed with MS, with no further sample treatment in just two hours. The results were successfully compared with those obtained by the ELISA methodology.
  • Publication
    Serum autoantibody biomarkers for management of rheumatoid arthritis disease
    (MDPI, 2023-03-13) Sánchez Tirado, Esther; Agüí Chicharro, María Lourdes; Sánchez-Paniagua López, Marta; González Cortés, Araceli; López Ruiz, María Beatriz; Yáñez-Sedeño Orive, Paloma; Pingarrón Carrazón, José Manuel
    Rheumatoid arthritis (RA) is a systemic chronic autoimmune inflammatory disease that is characterized by the destruction of bone and production of autoantibodies such as rheumatoid factor (RF) and anticitrullinated protein antibodies (ACPAs). The high prevalence of this disease and the need of affordable tools for its early detection led us to prepare the first electrochemical immunoplatform for the simultaneous determination of four RA biomarkers, the autoantibodies: RF, anti-peptidyl-arginine deiminase enzyme (anti-PAD4), anti-cyclic citrullinated peptide (anti-CCP), and anti-citrullinated vimentin (anti-MCV). Functionalized magnetic beads (MBs) were used to immobilize the specific antigens, and sandwich-type immunoassays were implemented for the amperometric detection of the four autoantibodies, using the horseradish peroxidase (HRP)/H2O2/hydroquinone (HQ) system. The immunoplatform was applied to the determination of the biomarkers in human serum of twenty-two patients diagnosed with RA and four healthy individuals, and the results were validated against ELISA tests and the certified values.