Integration of organic electrochemical transistors and immuno-affinity membranes for label-free detection of interleukin-6 in the physiological concentration range through antibody–antigen recognition

2018 ◽  
Vol 6 (33) ◽  
pp. 5400-5406 ◽  
Author(s):  
Denis Gentili ◽  
Pasquale D’Angelo ◽  
Francesca Militano ◽  
Rosalinda Mazzei ◽  
Teresa Poerio ◽  
...  
Keyword(s):  
Interleukin 6 ◽  
Antigen Recognition ◽  
Label Free ◽  
Physiological Concentration ◽  
Cytokine Detection ◽  
Affinity Membrane ◽  
Electrochemical Transistor ◽  
Label Free Detection ◽  
Affinity Membranes ◽  
Organic Electrochemical Transistors

A label-free immunosensor based on an organic electrochemical transistor integrated with an immuno-affinity membrane for cytokine detection at physiologically relevant concentrations is reported.

scholarly journals Plasmonic nanocrystals on polycarbonate substrates for direct and label-free biodetection of Interleukin-6 in bioengineered 3D skeletal muscles

Nanophotonics ◽  
2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Gerardo A Lopez-Muñoz ◽  
Juan M Fernández-Costa ◽  
Maria Alejandra Ortega ◽  
Jordina Balaguer-Trias ◽  
Eduard Martin-Lasierra ◽  
...  
Keyword(s):  
Interleukin 6 ◽  
Limit Of Detection ◽  
Culture Media ◽  
Incident Angle ◽  
Wide Field ◽  
Label Free ◽  
Cell Culture Media ◽  
Muscle Tissues ◽  
Label Free Detection ◽  
Potential Benefits

Abstract The development of nanostructured plasmonic biosensors has been widely widespread in the last years, motivated by the potential benefits they can offer in integration, miniaturization, multiplexing opportunities, and enhanced performance label-free biodetection in a wide field of applications. Between them, engineering tissues represent a novel, challenging, and prolific application field for nanostructured plasmonic biosensors considering the previously described benefits and the low levels of secreted biomarkers (≈pM–nM) to detect. Here, we present an integrated plasmonic nanocrystals-based biosensor using high throughput nanostructured polycarbonate substrates. Metallic film thickness and incident angle of light for reflectance measurements were optimized to enhance the detection of antibody–antigen biorecognition events using numerical simulations. We achieved an enhancement in biodetection up to 3× as the incident angle of light decreases, which can be related to shorter evanescent decay lengths. We achieved a high reproducibility between channels with a coefficient of variation below 2% in bulk refractive index measurements, demonstrating a high potential for multiplexed sensing. Finally, biosensing potential was demonstrated by the direct and label-free detection of interleukin-6 biomarker in undiluted cell culture media supernatants from bioengineered 3D skeletal muscle tissues stimulated with different concentrations of endotoxins achieving a limit of detection (LOD) of ≈ 0.03 ng/mL (1.4 pM).

Nanophotonics based label free detection mechanism for real-time monitoring of interleukin-6

Nanoscale ◽  
2020 ◽  
Vol 12 (16) ◽  
pp. 9194-9207 ◽  
Author(s):  
Munezza A. Khan ◽  
Mohammad Mujahid ◽  
Say Chye Joachim Loo ◽  
Vidya N. Chamundeswari
Keyword(s):  
Photonic Crystals ◽  
Real Time ◽  
Interleukin 6 ◽  
High Fidelity ◽  
Label Free ◽  
Real Time Monitoring ◽  
Detection Mechanism ◽  
Label Free Detection ◽  
Real Time Detection

Magneto-photonic crystals/MPCs are promising candidates for devising high-fidelity embedded biosensor systems which offer facile & real time detection of diagnostic proteins.

scholarly journals Label-free detection of interleukin-6 using electrolyte gated organic field effect transistors

2017 ◽  
Vol 12 (5) ◽  
pp. 05F401 ◽  
Author(s):  
Chiara Diacci ◽  
Marcello Berto ◽  
Michele Di Lauro ◽  
Elena Bianchini ◽  
Marcello Pinti ◽  
...  
Keyword(s):  
Interleukin 6 ◽  
Field Effect ◽  
Field Effect Transistors ◽  
Label Free ◽  
Organic Field Effect Transistors ◽  
Label Free Detection

scholarly journals The Role of Surface Chemistry in the Efficacy of Protein and DNA Microarrays for Label-Free Detection: An Overview

Polymers ◽  
2021 ◽  
Vol 13 (7) ◽  
pp. 1026
Author(s):  
Elisa Chiodi ◽  
Allison M. Marn ◽  
Matthew T. Geib ◽  
M. Selim Ünlü
Keyword(s):  
Surface Chemistry ◽  
Surface Functionalization ◽  
Dna Microarrays ◽  
Label Free ◽  
Polymeric Coatings ◽  
Label Free Detection ◽  
Particle Imaging ◽  
Single Particle Imaging ◽  
The Impact

The importance of microarrays in diagnostics and medicine has drastically increased in the last few years. Nevertheless, the efficiency of a microarray-based assay intrinsically depends on the density and functionality of the biorecognition elements immobilized onto each sensor spot. Recently, researchers have put effort into developing new functionalization strategies and technologies which provide efficient immobilization and stability of any sort of molecule. Here, we present an overview of the most widely used methods of surface functionalization of microarray substrates, as well as the most recent advances in the field, and compare their performance in terms of optimal immobilization of the bioreceptor molecules. We focus on label-free microarrays and, in particular, we aim to describe the impact of surface chemistry on two types of microarray-based sensors: microarrays for single particle imaging and for label-free measurements of binding kinetics. Both protein and DNA microarrays are taken into consideration, and the effect of different polymeric coatings on the molecules’ functionalities is critically analyzed.

scholarly journals Label-Free Electrochemical Sensor for Rapid Bacterial Pathogen Detection Using Vancomycin-Modified Highly Branched Polymers

Sensors ◽  
2021 ◽  
Vol 21 (5) ◽  
pp. 1872
Author(s):  
Holger Schulze ◽  
Harry Wilson ◽  
Ines Cara ◽  
Steven Carter ◽  
Edward N. Dyson ◽  
...  
Keyword(s):  
Pathogen Detection ◽  
Electrochemical Impedance ◽  
Point Of Care ◽  
Branched Polymers ◽  
Label Free ◽  
Conformation Change ◽  
Gram Positive ◽  
Gram Positive Bacteria ◽  
Staphylococcus Carnosus ◽  
Label Free Detection

Rapid point of care tests for bacterial infection diagnosis are of great importance to reduce the misuse of antibiotics and burden of antimicrobial resistance. Here, we have successfully combined a new class of non-biological binder molecules with electrochemical impedance spectroscopy (EIS)-based sensor detection for direct, label-free detection of Gram-positive bacteria making use of the specific coil-to-globule conformation change of the vancomycin-modified highly branched polymers immobilized on the surface of gold screen-printed electrodes upon binding to Gram-positive bacteria. Staphylococcus carnosus was detected after just 20 min incubation of the sample solution with the polymer-functionalized electrodes. The polymer conformation change was quantified with two simple 1 min EIS tests before and after incubation with the sample. Tests revealed a concentration dependent signal change within an OD600 range of Staphylococcus carnosus from 0.002 to 0.1 and a clear discrimination between Gram-positive Staphylococcus carnosus and Gram-negative Escherichia coli bacteria. This exhibits a clear advancement in terms of simplified test complexity compared to existing bacteria detection tests. In addition, the polymer-functionalized electrodes showed good storage and operational stability.

H2O2-sensitive quantum dots for the label-free detection of glucose

Talanta ◽  
2010 ◽  
Vol 82 (3) ◽  
pp. 997-1002 ◽  
Author(s):  
Mei Hu ◽  
Jing Tian ◽  
Hao-Ting Lu ◽  
Li-Xing Weng ◽  
Lian-Hui Wang
Keyword(s):  
Quantum Dots ◽  
Label Free ◽  
Label Free Detection
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