Chemical Sensors
Chemical Sensors - Related Videos
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...
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.
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.
02:52
Chemical Formulas
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2020
A chemical formula presents information about the proportions of atoms constituting a particular chemical compound or molecule, mainly using symbols of elements and numbers. At times other symbols, such as dashes, parentheses, brackets, commas, plus, and minus signs, are also used. A chemical formula can be one of three types – molecular, empirical, and structural. Molecular Formula The molecular formula represents a molecule or a chemical compound using chemical symbols (to indicate the...
FAQs
Selectivity comes from matching the recognition element to the target analyte. Receptors, enzymes, and reactive coatings can bind or react preferentially with particular substances, helping distinguish them from other chemicals in the sample. In chemistry, this component determines which gases, ions, biomolecules, or pollutants produce a response and therefore strongly influences the usefulness of the measurement.
The transducer translates the recognition event into a measurable physical change. Depending on the sensor design, that change may appear as electrical potential, current, light, mass, or temperature. The selected signal type provides the readout used to identify or measure the analyte, linking molecular recognition with an experimentally accessible analytical result.
Their value lies in combining rapid analysis with portable and continuous measurement. Instead of relying only on occasional laboratory testing, a sensor can follow chemical changes as they occur and provide repeated readings with limited sample preparation. This temporal information can expose evolving conditions in environmental, industrial, medical, or food-related settings.
A measurement begins when the sample contacts the sensor’s recognition element. The target substance then binds or reacts with that component, producing a chemical change that the transducer converts into an electrical, optical, mass, or thermal signal. The resulting output is read as evidence of the analyte’s presence or measured level, depending on the sensor design.
They are particularly useful when analysts need rapid, selective information without extensive sample preparation. Environmental monitoring can track pollutants, industrial process control can follow chemical conditions, medical diagnostics can assess biomolecules, and food safety testing can examine relevant substances. Portability and continuous operation make the approach valuable when conditions change over time or at locations outside a laboratory.
The approach can be adapted to several important analyte classes, including gases, ions, biomolecules, and pollutants. Different recognition elements provide the chemical selectivity, while the transducer determines how the response becomes measurable. This combination allows the same broad analytical strategy to support environmental, industrial, biomedical, and food-related investigations with different target substances.