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• W3157403712 abstract "Human immunodeficiency virus (HIV) is still considered a pandemic, and the detection of p24-HIV protein has an important role in the early diagnosis of HIV in adults and newborns. The accessibility of these trials depends on the price and execution difficulty of the method, which can be reduced using electrochemical methods by using enzymeless approaches, disposable and accurate devices. In this work, graphene quantum dots were acquired by a simple synthesis and employed as an electrochemical signal amplifier and support for the aptamer immobilization through a feasible and stable modification of disposable screen-printed electrodes. The device has been easily assembled and used to detect p24-HIV protein without the interference of similar proteins or sample matrix. Using the best set of experimental conditions, a linear correlation between analytical signal and log of p24-HIV concentration from 0.93 ng mL −1 to 93 μg mL −1 and a limit of detection of 51.7 pg mL −1 were observed. The developed device was applied to p24 determination in spiked human serum and provided distinct levels of signal for positive and negative samples, successfully identifying real samples with the target protein. This sensor is a step towards the development of point-of-care devices and the popularization of electrochemical methods for trials and diagnostics of relevant diseases. • Early diagnosis of HIV based on p24-HIV protein detection by electrochemical method. • Simple synthesis of GQDs used as signal amplifier and support for the aptamer. • Screen-printed electrode as disposable platform for p24-HIV aptasensor construction. • First step towards the development of POC devices for trials of relevant diseases." @default.
• W3157403712 created "2021-05-10" @default.
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• W3157403712 date "2021-06-01" @default.
• W3157403712 modified "2023-10-12" @default.
• W3157403712 title "Label-free aptasensor for p24-HIV protein detection based on graphene quantum dots as an electrochemical signal amplifier" @default.
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• W3157403712 doi "https://doi.org/10.1016/j.aca.2021.338548" @default.
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