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Extracellular Protein Microarray Technology for High Throughput Detection of Low Affinity Receptor-Ligand Interactions
Published on: January 7, 2019
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Instrument-Free Protein Microarray Fabrication for Accurate Affinity Measurements.
Iris Celebi1, Matthew T Geib1, Elisa Chiodi1
1Department of Electrical and Computer Engineering, Boston University, 8st Mary's Street, Boston, MA 02215, USA.
Biosensors
|November 3, 2020
Summary
Researchers can now create high-performance protein microarrays using a low-cost, manual micropipetting technique. This instrument-free method improves capture efficiency and signal-to-noise ratio compared to robotic spotters, making protein assays more accessible.
Area of Science:
- Biotechnology
- Biochemistry
- Analytical Chemistry
Background:
- Protein microarrays are vital for drug discovery, biomarker development, and diagnostics.
- Current microarray fabrication relies on expensive robotic spotters requiring trained personnel.
- Limited resources in smaller labs hinder access to advanced microarray technology.
Purpose of the Study:
- To introduce a low-cost, instrument-free method for fabricating multiplexed protein microarrays.
- To compare the performance of manually spotted protein assays against robotically spotted ones.
- To demonstrate the efficiency and accessibility of manual spotting for protein assay development.
Main Methods:
- Development of an instrument-free, manual dispensing technique using standard micropipettes.
- Fabrication of protein microarrays with α-lactalbumin probes via manual spotting.
- Analysis of binding kinetics using an interferometric reflectance imaging sensor platform.
- Comparison of manual vs. robotic spotting based on capture efficiency and signal-to-noise ratio.
Main Results:
- Manual spotting achieved superior performance compared to state-of-the-art robotic spotters.
- Protein arrays prepared manually exhibited a ~4-fold improvement in binding signal.
- A ~3-fold better signal-to-noise ratio (SNR) was observed with manual spotting.
- Accurate determination of antigen-antibody binding coefficients in a 24-plex format with <5% error.
Conclusions:
- Manual micropipetting offers a cost-effective and efficient alternative for protein microarray fabrication.
- This technique democratizes protein assay development, benefiting resource-limited laboratories.
- The developed method enables high-performance multiplexed protein assays with improved data quality.
