M
Maria Freitas
Researcher at Instituto Superior de Engenharia do Porto
Publications - 22
Citations - 944
Maria Freitas is an academic researcher from Instituto Superior de Engenharia do Porto. The author has contributed to research in topics: Detection limit & Chemistry. The author has an hindex of 12, co-authored 18 publications receiving 679 citations. Previous affiliations of Maria Freitas include University of Oviedo & Instituto Politécnico Nacional.
Papers
More filters
Journal ArticleDOI
Characterization of Active Sites on Carbon Catalysts
TL;DR: In this article, a method based on deconvolution of TPD spectra is proposed for the characterization of surface oxygen groups, which can act as the active sites on carbon catalysts.
Journal ArticleDOI
Breast cancer biomarker (HER2-ECD) detection using a molecularly imprinted electrochemical sensor
TL;DR: In this paper, an electrochemical molecularly imprinted polymer (MIP) sensor was developed for the quantification of HER2-ECD, which was characterized by cyclic voltammetry and electrochemical impedance spectroscopy.
Journal ArticleDOI
Molecularly imprinted electrochemical sensor for the point-of-care detection of a breast cancer biomarker (CA 15-3)
TL;DR: In this article, a molecularly imprinted polymer (MIP)-based electrochemical (voltammetric) sensor was developed, based on direct surface imprinting of CA 15-3 on a screen-printed gold electrode (Au-SPE).
Journal ArticleDOI
Magnetic dispersive micro solid-phase extraction and gas chromatography determination of organophosphorus pesticides in strawberries.
Virgínia Cruz Fernandes,Maria Freitas,João G. Pacheco,José Maria Oliveira,Valentina F. Domingues,Cristina Delerue-Matos +5 more
TL;DR: It was determined that the MNPs have an excellent function as sorbent when purified even using less amount of sorbents and the magnetic properties allowed non-use of the centrifugation in cleanup step.
Journal ArticleDOI
Iron oxide/gold core/shell nanomagnetic probes and CdS biolabels for amplified electrochemical immunosensing of Salmonella typhimurium.
Maria Freitas,Subramanian Viswanathan,Subramanian Viswanathan,Henri P. A. Nouws,Maria Beatriz P.P. Oliveira,Cristina Delerue-Matos +5 more
TL;DR: An electrochemical immunoassay using iron/gold core/shell nanoparticles (Fe@Au) conjugated with anti-Salmonella antibodies was developed and showed that it is possible to determine the bacteria in milk at low concentrations and is suitable for the rapid and sensitive detection of S. typhimurium in real samples.