Tnbs Assay
Tnbs Assay - Related Videos
05:08
A TNBS-Induced Rodent Model to Study the Pathogenic Role of Mechanical Stress in Crohn's Disease
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Cited by 5 •
2022
The present protocol describes the development of a Crohn's-like colitis model in rodents. Transmural inflammation leads to stenosis at the TNBS instillation site, and mechanical enlargement is observed in the segment proximal to the stenosis. These changes allow studying mechanical stress in colitis.
06:44
A Mouse Model for Chronic Pancreatitis via Bile Duct TNBS Infusion
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Cited by 1 •
2021
Chronic pancreatitis (CP) is a disease characterized by inflammation and fibrosis of the pancreas, often associated with intractable abdominal pain. This article focuses on refining the technique to generate a mouse model of CP via bile duct infusion with 2,4,6 -trinitrobenzene sulfonic acid (TNBS).
08:08
An Assay for Measuring the Activity of Escherichia coli Inducible Lysine Decarboxyase
0 Views •
Cited by 7 •
2010
The activity of the inducible lysine decarboxylase is monitored by reacting the substrate L-lysine and the product cadaverine with 2,4,6-trinitrobenzensulfonic acid to form adducts that have differential solubility in toluene.
09:04
DNBS/TNBS Colitis Models: Providing Insights Into Inflammatory Bowel Disease and Effects of Dietary Fat
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Cited by 91 •
2014
DNBS/TNBS induced colitis offers an alternative and inexpensive method to study the pathobiology of inflammatory bowel disease. The protocol discussed in this paper outlines the successful application of DNBS to induce colitis in mice and rats and allows one to thoroughly study host-mediated intestinal responses.
08:02
Visualization of Estrogen Receptors in Colons of Mice with TNBS-Induced Crohn's Disease using Immunofluorescence
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Cited by 2 •
2020
The protocol presents a complete validated TNBS-induced murine model of Crohn's disease and methods for visualization of estrogen receptors by immunohistochemistry using immunofluorescence of formalin-fixed colon sections embedded in paraffin.
FAQs
The measurement reflects accessible primary amines rather than an indiscriminate count of all nitrogen-containing groups. Amines that remain chemically available can react with TNBS, whereas groups consumed during crosslinking or conjugation no longer contribute in the same way. Consequently, the result can reveal both the material’s measurable amine content and changes caused by processing.
Alkaline conditions are central because the reaction is carried out in that environment and produces stable trinitrophenyl derivatives. Stability allows the assay to convert chemical reactivity into a spectrophotometric signal that can be compared with standards. The absorbance therefore serves as an indirect readout of accessible primary amines in the tested protein, peptide, or biomaterial.
Comparing TNBS signals before and after treatment helps estimate whether a fabrication or modification step has consumed available amines. A lower post-treatment signal is consistent with fewer accessible primary groups, as may occur after crosslinking or conjugation. Interpretation should focus on available functional groups, since the assay does not simply report total material composition independent of chemical accessibility.
Standards provide the reference needed to translate measured absorbance into a comparable estimate of primary-amine content. The sample signal is interpreted against this reference rather than treated as a standalone color value. This comparison supports protein or peptide characterization and makes it possible to evaluate differences among modified materials or processing conditions using the same measurement framework.
A basic workflow starts by placing the protein, peptide, or amino-containing biomaterial in alkaline reaction conditions with TNBS. After primary amines form stable trinitrophenyl derivatives, absorbance is measured spectrophotometrically and evaluated against standards. The resulting comparison supports estimation of accessible amine content and enables samples to be assessed using a common analytical sequence.
In scaffold, hydrogel, and other biomaterial studies, the assay can track how fabrication or treatment changes available primary amines. Those measurements help characterize chemical composition and monitor reactions such as crosslinking or conjugation. Because functional-group availability can shift as a material is modified, TNBS results provide a way to compare starting and treated material states.
The same readout can address different bioengineering questions: in proteins and peptides, it supports concentration or chemical-composition measurements; in scaffolds and hydrogels, it helps follow modification during fabrication or treatment. This flexibility comes from linking absorbance to accessible primary amines, allowing chemically different sample types to be examined through a shared assay principle.