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An electrochemical aptasensor for detection of prostate‐specific antigen using reduced graphene gold nanocomposite and Cu/carbon quantum dots

We report a label‐free electrochemical aptamer‐based biosensor for the detection of human prostate‐specific antigen (PSA). The thiolate DNA aptamer against PSA was conjugated to the reduced graphene oxide/Au (RGO‐Au) nanocomposite through the self‐assembly of Au‐S groups. Owing to the large volume t...

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Published in:Biotechnology and applied biochemistry 2022-10, Vol.69 (5), p.2102-2111
Main Authors: Mehdipour, Golnaz, Shabani Shayeh, Javad, Omidi, Meysam, Pour Madadi, Mehrab, Yazdian, Fatemeh, Tayebi, Lobat
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container_issue 5
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container_title Biotechnology and applied biochemistry
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creator Mehdipour, Golnaz
Shabani Shayeh, Javad
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description We report a label‐free electrochemical aptamer‐based biosensor for the detection of human prostate‐specific antigen (PSA). The thiolate DNA aptamer against PSA was conjugated to the reduced graphene oxide/Au (RGO‐Au) nanocomposite through the self‐assembly of Au‐S groups. Owing to the large volume to surface ratio, the RGO‐Au nanocomposite provides a large surface for aptamer loading. The RGO‐Au/aptamer was combined with a Nafion polymer and immobilized on a glassy carbon electrode. The interaction of aptamer with PSA was studied by cyclic voltammetry, square wave voltammetry, and electrochemical impedance spectroscopy. The detection of limit for prepared electrode was obtained about 50 pg/mL at the potential of 0.4 V in potassium hexacyanoferrate [K4Fe(CN)6] medium. To decrease the limit of detection (LOD) and applied potential of the prepared nanoprobe Cu/carbon quantum dots (CuCQD) is introduced as a new redox. The results show that this new electrochemical medium provides better conditions for the detection of PSA. LOD of a nanoprobe in CuCQD media was obtained as 40 pg/mL at the potential of −0.2 V. Under optimal conditions, the aptasensor exhibits a linear response to PSA with a LOD as small as 3 pg/mL. The present aptasensor is highly selective and sensitive and shows satisfactory stability and repeatability. We report a label‐free electrochemical aptamer‐based biosensor for the detection of human prostate‐specific antigen (PSA).
doi_str_mv 10.1002/bab.2271
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subjects Antigens
Aptamers
Biosensors
Carbon
Copper
Cu carbon quantum dot
Deoxyribonucleic acid
DNA
electrochemical aptasensor
Electrochemical impedance spectroscopy
Electrochemistry
Electrodes
Glassy carbon
Gold
Graphene
Nanocomposites
Polymers
Potassium
Prostate
prostate‐specific antigen
Quantum dots
quartz crystal microbalance
reduced graphene oxide/gold nanocomposite
Spectroscopy
Square waves
Voltammetry
title An electrochemical aptasensor for detection of prostate‐specific antigen using reduced graphene gold nanocomposite and Cu/carbon quantum dots
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