RT Journal Article
T1 A Novel, Quick, and Reliable Smartphone-Based Method for Serum PSA Quantification: Original Design of a Portable Microfluidic Immunosensor-Based System.
A1 Ortega, Francisco Gabriel
A1 Gomez, German E
A1 Gonzalez-Martinez, Coral
A1 Valero, Teresa
A1 Exposito-Hernandez, Jose
A1 Puche, Ignacio
A1 Rodriguez-Martinez, Alba
A1 Serrano, Maria Jose
A1 Lorente, Jose Antonio
A1 Fernandez-Baldo, Martin A
K1 PSA
K1 cancer biomarker
K1 cancer diagnosis
K1 liquid biopsy
K1 magnetic microbeads
K1 microfluidic immunosensor
AB We describe a versatile, portable, and simple platform that includes a microfluidic electrochemical immunosensor for prostate-specific antigen (PSA) detection. It is based on the covalent immobilization of the anti-PSA monoclonal antibody on magnetic microbeads retained in the central channel of a microfluidic device. Image flow cytometry and scanning electron microscopy were used to characterize the magnetic microbeads. A direct sandwich immunoassay (with horseradish peroxidase-conjugated PSA antibody) served to quantify the cancer biomarker in serum samples. The enzymatic product was detected at -100 mV by amperometry on sputtered thin-film electrodes. Electrochemical reaction produced a current proportional to the PSA level, with a linear range from 10 pg mL-1 to 1500 pg mL-1. The sensitivity was demonstrated by a detection limit of 2 pg mL-1 and the reproducibility by a coefficient of variation of 6.16%. The clinical performance of this platform was tested in serum samples from patients with prostate cancer (PCa), observing high specificity and full correlation with gold standard determinations. In conclusion, this analytical platform is a promising tool for measuring PSA levels in patients with PCa, offering a high sensitivity and reduced variability. The small platform size and low cost of this quantitative methodology support its suitability for the fast and sensitive analysis of PSA and other circulating biomarkers in patients. Further research is warranted to verify these findings and explore its potential application at all healthcare levels.
PB MDPI AG
SN 2072-6694
YR 2022
FD 2022-09-06
LK http://hdl.handle.net/10668/20917
UL http://hdl.handle.net/10668/20917
LA en
NO Ortega FG, Gómez GE, González-Martinez C, Valero T, Expósito-Hernández J, Puche I, et al. A Novel, Quick, and Reliable Smartphone-Based Method for Serum PSA Quantification: Original Design of a Portable Microfluidic Immunosensor-Based System. Cancers (Basel). 2022 Sep 16;14(18):4483.
DS RISalud
RD Apr 9, 2025