Spectroscopic Assays
Spectroscopic Assays - Related Videos
13:06
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Cited by 12 •
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Electron spectroscopic imaging can image and distinguish nucleic acid from protein at nanometer resolution. It can be combined with the miniSOG system, which is able to specifically label tagged proteins in transmission electron microscopy samples. We illustrate the use of these technologies using double-strand break repair foci as an example.
08:13
A Filter-based Surface Enhanced Raman Spectroscopic Assay for Rapid Detection of Chemical Contaminants
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Cited by 8 •
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A procedure for fabrication and performing the filter-based surface enhanced Raman spectroscopic (SERS) assay for the detection of chemical contaminants (i.e., pesticide ferbam and antibiotic ampicillin) is presented.
11:53
Purification and Reconstitution of TRPV1 for Spectroscopic Analysis
0 Views •
Cited by 1 •
2018
This article describes specific methods to obtain biochemical quantities of detergent-solubilized TRPV1 for spectroscopic analysis. The combined protocols provide biochemical and biophysical tools that can be adapted to facilitate structural and functional studies for mammalian ion channels in a membrane-controlled environment.
10:31
Diffuse Reflectance Infrared Spectroscopic Identification of Dispersant/Particle Bonding Mechanisms in Functional Inks
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Cited by 11 •
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Formulation of stable, functional inks is critical to expanding the applications of additive manufacturing. In turn, knowledge of the mechanisms of dispersant/particle bonding is required for effective ink formulation. Diffuse Reflectance Fourier Transform Infrared Spectroscopy (DRIFTS) is presented as a simple, inexpensive way to gain insight into these mechanisms.
05:37
Fabrication of an Optical Cell Dryer for the Spectroscopic Analysis Cells
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2019
A protocol for fabricating a device for simultaneously drying multiple optical cells is presented.
FAQs
Under appropriate conditions, absorbance changes can be related to the amount of absorbing material through the Beer-Lambert relationship. This allows an optical measurement at a selected wavelength to serve as a concentration readout rather than merely a detection signal. The relationship is therefore central when spectroscopic assays are used to quantify proteins, nucleic acids, or other biological samples.
Absorbance, fluorescence, and scattering provide different kinds of optical response. In an assay, absorbance measurements can support concentration estimates, while fluorescence or scattering measurements may be used to examine changes linked to molecular environment or reaction progress. Choosing among them depends on whether the study prioritizes amount, molecular context, or change during a biological process.
Selecting a wavelength determines which part of a sample’s optical response is measured. That choice affects whether the resulting signal can be interpreted for concentration, molecular environment, or reaction progress. In biological work, matching the selected wavelength to the intended measurement helps convert the observed response into information that answers the experimental question.
Start with the information the experiment must produce. Absorbance is appropriate when the goal is a concentration-related measurement under suitable conditions, whereas fluorescence or scattering may be selected when the relevant change concerns molecular environment or reaction progress. This choice connects the instrument signal to the biological question and helps keep interpretation focused.
A basic workflow is to select the biological question, choose an optical response and wavelength, measure the sample, and interpret the resulting signal. If concentration is the target, absorbance data may be evaluated through the Beer-Lambert relationship when its conditions apply. Microplate compatibility can support organized measurements across many samples.
For proteins and nucleic acids, the principal use described is quantification. Enzyme assays can instead follow activity by monitoring reaction progress, allowing the optical signal to reflect biochemical change over time. These applications make the approach useful for routine biological analysis as well as mechanistic studies, where researchers seek to understand how a process behaves.
Ligand-binding studies use optical measurements to examine changes associated with molecular interactions, while drug research benefits from the methods’ speed, sensitivity, and microplate compatibility. Those characteristics support efficient analysis and make the assays suitable for both routine experimental work and studies designed to investigate biological mechanisms.