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Dynamic Bio‐Barcode Assay Enables Electrochemical Detection of a Cancer Biomarker in Undiluted Human Plasma: A Sample‐In‐Answer‐Out Approach
Author(s) -
Traynor Sarah M.,
Wang Guan A.,
Pandey Richa,
Li Feng,
Soleymani Leyla
Publication year - 2020
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.202009664
Subject(s) - barcode , biomarker , biosensor , chromatography , human plasma , detection limit , sample preparation , point of care , linear range , reagent , dynamic range , chemistry , computational biology , nanotechnology , computer science , materials science , medicine , biology , biochemistry , pathology , computer vision , operating system
Abstract There is a need for biosensing systems that can be operated at the point‐of‐care (POC) for disease screening and diagnostics and health monitoring. In spite of this, simple to operate systems with the required analytical sensitivity and specificity in clinical samples, using a sample‐in‐answer‐out approach, remain elusive. Reported here is an electrochemical bio‐barcode assay (e‐biobarcode assay) that integrates biorecognition with signal transduction using molecular (DNA/protein) machines and signal readout using nanostructured electrodes. The e‐biobarcode assay eliminates multistep processing and uses a single step for analysis following sample collection into the reagent tube. A clinically relevant performance for the analysis of prostate specific antigen (PSA) in undiluted and unprocessed human plasma: a log‐linear range of 1 ng mL −1 –200 ng mL −1 and a LOD of 0.4 ng mL −1 , was achieved. The e‐biobarcode assay offers a realistic solution for biomarker analysis at the POC.