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Bacterial Peptide Display for the Selection of Novel Biotinylating Enzymes
Published on: October 3, 2019
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Specific detection of avidin-biotin binding using liquid crystal droplets
Mashooq Khan1, Soo-Young Park1
1School of Applied Chemical Engineering, Department of Polymer Science and Engineering, Kyungpook National University, Daegu 702-701, Republic of Korea.
Colloids and Surfaces. B, Biointerfaces
|February 18, 2015
Summary
Functionalized liquid crystal droplets detect avidin with high sensitivity. This novel biosensor uses biotinylated polymer chains on 4-cyano-4′-pentylbiphenyl (5CB) droplets for specific protein detection.
Area of Science:
- Materials Science: Functionalized liquid crystals and polymer chemistry.
- Biotechnology: Biosensor development and protein detection.
- Nanotechnology: Microfluidic fabrication of functionalized droplets.
Background:
- Liquid crystal (LC) droplets offer unique optical properties exploitable for sensing applications.
- Functionalization of LC droplet surfaces is crucial for specific analyte recognition.
- Avidin-biotin binding is a well-established high-affinity biological interaction.
Purpose of the Study:
- To develop a novel biosensor using functionalized liquid crystal droplets for specific protein detection.
- To investigate the use of poly(acrylic acid-b-4-cyanobiphenyl-4'-undecylacrylate) (PAA-b-LCP) for surface functionalization of 4-cyano-4'-pentylbiphenyl (5CB) droplets.
- To characterize the avidin-biotin binding event at the droplet interface and determine the sensor's sensitivity and specificity.
Main Methods:
- Microfluidic technique employed to create PAA-b-LCP functionalized 5CB droplets.
- Biotinylation of PAA chains on the 5CB droplets for avidin capture.
- Polarized optical microscopy used to observe droplet configurational changes upon avidin-biotin binding.
- Varying biotin concentrations to optimize functionalization and determine limit of detection.
Main Results:
- Successful creation of biotinylated 5CB droplets capable of specific avidin detection.
- Avidin-biotin binding induced a distinct configurational change (radial to bipolar) in the 5CB droplets.
- Achieved a limit of detection of 0.5 μg/mL for avidin with optimal biotinylation (>100 μg/mL biotin solution).
- Demonstrated high specificity, distinguishing avidin from other proteins like BSA, lysozyme, hemoglobin, and chymotrypsinogen.
Conclusions:
- Functionalized 5CB droplets serve as a sensitive and specific biosensor platform.
- The observed configurational change in LC droplets provides a clear readout for ligand-receptor binding.
- This technology shows promise for detecting specific proteins and other analytes via a ligand/receptor model.
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