Ratiometric Sensors
Ratiometric Sensors - Related Videos
13:05
Ratiometric Imaging of Extracellular pH in Dental Biofilms
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Cited by 24 •
2016
A pH-sensitive ratiometric dye is used in combination with confocal laser scanning microscopy and digital image analysis to monitor extracellular pH in dental biofilms in real-time.
09:14
Glovebox and Impurity Sensors
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2023
Source: Tamara M. Powers, Department of Chemistry, Texas A&M University The glovebox provides a straightforward means to handle air- and moisture-sensitive solids and liquids. The glovebox is what it sounds like: a box with gloves attached to one or more sides, which allows the user to perform manipulations within the glovebox under an inert atmosphere. For manipulations under inert atmospheres, chemists can choose between Schlenk or high-vacuum techniques and a glovebox. Schlenk and...
09:30
Bacterial Detection & Identification Using Electrochemical Sensors
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Cited by 6 •
2013
We describe an electrochemical sensor assay method for rapid bacterial detection and identification. The assay involves a sensor array functionalized with DNA oligonucleotide capture probes for ribosomal RNA (rRNA) species-specific sequences. Sandwich hybridization of target rRNA with the capture probe and a horseradish peroxidase-linked DNA oligonucleotide detector probe produces a measurable amperometric current.
10:23
Glutamine Flux Imaging Using Genetically Encoded Sensors
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Cited by 7 •
2014
This article will demonstrate how to monitor glutamine dynamics in live cells using FRET. Genetically encoded sensors allow real-time monitoring of biological molecules at a subcellular resolution. Experimental design, technical details of the experimental settings, and considerations for post-experimental analyses will be discussed for genetically encoded glutamine sensors.
05:15
An Aptamer-based Sensor for Unchelated Gadolinium(III)
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2017
The use of polydeoxynucleotide (44-mer aptamer) molecules for sensing unchelated gadolinium(III) ion in an aqueous solution is described. The presence of the ion is detected via an increase in the fluorescence emission of the sensor.
FAQs
The ratio provides a normalized readout by relating the target-responsive signal to an internal reference signal. This reduces the influence of probe concentration, uneven sample loading, illumination differences, and detector sensitivity. As a result, measurements can remain more comparable when optical or sample conditions vary across locations, samples, or experiments.
The target-responsive signal changes when binding or chemical conversion occurs, while the reference signal supplies an internal comparison point. Their relationship converts the target-dependent change into a ratio rather than an isolated intensity value. This design helps distinguish changes caused by the biochemical target from changes caused by measurement conditions.
A single intensity measurement can change because of the amount of probe, illumination, detector response, or sample distribution, even when target levels are unchanged. Comparing two signals helps compensate for these influences. The resulting ratio supports more reliable quantitative comparisons, especially when measurements are collected from different regions or under varying optical conditions.
A typical workflow collects the target-responsive signal and the internal reference signal under the same experimental conditions, then compares them as an intensity ratio. The ratio can be evaluated across samples, locations, or time points. This workflow turns paired optical information into a normalized readout for biochemical analysis.
In biochemistry, fluorescent ratiometric sensors can monitor pH, metal ions, metabolites, and enzyme activity. The appropriate sensor produces a target-dependent change in one signal while retaining a reference for normalization. These measurements can be performed in solutions or living cells, depending on the experimental setting described for the sensor.
They are especially useful for quantitative imaging, real-time analysis, and comparisons across experiments where optical conditions or sample loading may vary. In living cells, the normalized readout can help reduce artifacts from uneven distribution or changing detection conditions. In solutions, it supports more consistent interpretation of target-responsive signal changes.