Small Molecule Detection
Small Molecule Detection - Related Videos
08:53
Label-free Single Molecule Detection Using Microtoroid Optical Resonators
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Cited by 32 •
2015
We have developed a label-free biosensing system based on optical resonator technology known as Frequency Locking Optical Whispering Evanescent Resonator (FLOWER) that is capable of detecting single molecules in solution. Here the procedures behind this work are described and presented.
04:16
Cell Aggregation Assay to Detect Trans Interactions between Cell Adhesion Molecules
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2025
In this video, we demonstrate the technique to measure transcellular interactions between synaptic cell adhesion molecules through the HEK cell aggregation assay. In this assay, an equal number of HEK cells expressing a desired presynaptic cell adhesion molecule and a fluorescent protein are mixed with HEK cells expressing a post-synaptic cell adhesion molecule and another fluorescent protein. The interaction between the cell adhesion molecules forces the cells to aggregate, which can be...
13:15
Fabrication of Electrochemical-DNA Biosensors for the Reagentless Detection of Nucleic Acids, Proteins and Small Molecules
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Cited by 21 •
2011
"E-DNA" sensors, reagentless, electrochemical biosensors that perform well even when challenged directly in blood and other complex matrices, have been adapted to the detection of a wide range of nucleic acid, protein and small molecule analytes. Here we present a general procedure for the fabrication and use of such sensors.
02:38
Molecules and Compounds
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2020
Atoms and Molecules Everything in the universe is made up of matter, and matter is composed of a combination of elements. An atom is the smallest unit of an element that retains all properties of the element. For example, a silver coin is made up of silver atoms, and each silver atom retains the unique properties of the element — silver. Elements are pure substances consisting of identical atoms that cannot be broken down into simpler substances by chemical changes. Atomic elements contain...
05:46
Fluorescence-Based Detection of FEN1 Nuclease Activity and Screening of Small-Molecule Inhibitors
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2025
This protocol describes a gel shift biochemical assay for measuring FEN1 (Flap Endonuclease 1) activity and inhibitor development.
FAQs
Selectivity comes from matching the target compound with a receptor, enzyme, antibody, or nucleic acid probe that can bind it preferentially. This recognition step helps distinguish the molecule of interest from other compounds in a biological, environmental, or engineered sample. The chosen element therefore strongly influences which targets an assay can measure and how reliably it performs.
Target binding may produce a signal that is too weak or obscured by other sample components. Signal amplification strengthens the measurable response, while separating interferents reduces contributions from compounds that could distort the result. Combining either strategy with selective recognition can improve assay sensitivity and selectivity, supporting more dependable measurements in complex systems.
These readouts convert recognition into different measurable forms. Optical approaches monitor changes in light-related signals, electrical approaches measure changes in electrical behavior, and chemical approaches detect a chemical response. The recognition element remains central, but the selected readout affects how the assay or biosensor communicates target binding and how it can be integrated into an engineered platform.
Discrimination depends primarily on the recognition component and on how the assay handles competing sample constituents. Receptors, enzymes, antibodies, and nucleic acid probes offer different molecular interactions with targets, while interferent separation can reduce misleading responses. Together, these design choices determine the selectivity of measurements involving metabolites, drugs, toxins, or signaling molecules.
A practical design begins by selecting the target and a compatible recognition element, then linking binding to an optical, electrical, or chemical signal. The assay can next incorporate signal amplification, interferent separation, or both, depending on the measurement challenge. Finally, researchers may integrate the design into a biosensor or microfluidic platform for the intended system.
The approach supports measurement of metabolites, drugs, toxins, and signaling molecules across biological, environmental, and engineered systems. In bioengineering, these measurements contribute to disease diagnostics, therapeutic monitoring, environmental surveillance, and responsive biomaterial development. Microfluidic platforms and biosensors can help incorporate detection into engineered systems designed to analyze or respond to target compounds.