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Analysis Kinetics of Aptamer GO18-T-d by BLI (CAT#: STEM-MB-0271-CJ)

Introduction

The development of a sensitive, robust and inexpensive monitoring system for the detection of GTX1/4 in shellfish is essential. Biosensors are ideal alternatives for the monitoring of marine biotoxins because they can make up for most of the shortcomings of other methods. To date, there are no reports on biosensors for GTX1/4 detection because there is no identified specific recognition molecule. Recently, a novel and versatile screening technique for aptamer development, GO-SELEX, has attracted researchers’ attention. It is an graphene oxide-based screening method,which is immobilization-free, highly efficient and cost-effective. Compared to the typical MB-SELEX, GO-SELEX has significant advantages for small molecular aptamer development. The aptamer GO18-T-d was used as a novel molecular recognition element to construct a simple, label-free and real-time optical BLI aptasensor for the detection of GTX1/4.




Principle

Bio-Layer Interferometry (BLI) is an optical technique for measuring macromolecular interactions by analyzing interference patterns of white light reflected from the surface of a biosensor tip. BLI experiments are used to determine the kinetics and affinity of molecular interactions. In a BLI experiment, one molecule is immobilized to a Dip and Read Biosensor and binding to a second molecule is measured. A change in the number of molecules bound to the end of the biosensor tip causes a shift in the interference pattern that is measured in real-time.

Applications

Immunology/Inflammation, Toxicology

Procedure

1. Detect Buffers and prepare samples. BLI experiments are set up with one molecule immobilised on the surface of the biosensor (load sample) and a second molecule in solution (the analytical sample).
2. Fix the load sample on the biocompatible biosensor while the analytical sample is in solution.
3. The biosensor tip is immersed in the solution so that the target molecule begins to bind to the analysis sample.
4. Set up and run the BLI experiment. Molecules bound to or dissociated from the biosensor can generate response curves on the BLI system; unbound molecules, changes in the refractive index of the surrounding medium or changes in flow rate do not affect the interferogram pattern.
5. Collect and analyse data on the BLI's system.

Materials

• Equipment: Fortebio Bio-Layer Interferometry (BLI)
• Sample Type: DNA, RNA, Protein, Antibodies, Peptides, Small Molecules
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