Nitrite Detection
Nitrite Detection - Related Videos
07:29
Zebrafish as a Model to Assess the Teratogenic Potential of Nitrite
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Cited by 17 •
2016
Exposure to teratogens may cause birth defects. Zebrafish are useful for determining the teratogenic potential of chemicals. We demonstrate the utility of zebrafish by exposing embryos to various levels of nitrite and also at different times of exposure. We show that nitrite can be toxic and cause severe developmental defects.
07:19
Preparation of Rat Skeletal Muscle Homogenates for Nitrate and Nitrite Measurements
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Cited by 9 •
2021
We present protocols for three different methods for the homogenization of four different muscle groups of rat skeletal muscle tissue to measure and compare the levels of nitrate and nitrite. Furthermore, we compare different sample weights to investigate whether tissue sample size affects the results of homogenization.
08:25
Measuring Nitrite and Nitrate, Metabolites in the Nitric Oxide Pathway, in Biological Materials using the Chemiluminescence Method
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Cited by 28 •
2016
Nitric oxide (NO) is an important signaling molecule in vascular homeostasis. NO production in vivo is too low for direct measurement. Chemiluminescence provides useful insight into NO cycle via measuring its precursors and oxidation products, nitrite and nitrate. Nitrite / nitrate determination in body tissues and fluids is explained.
07:17
Production and Detection of Reactive Oxygen Species (ROS) in Cancers
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Cited by 278 •
2011
Here we propose simple methods to test and evaluate the presence of reactive oxygen species in cells.
09:10
Combination of Adhesive-tape-based Sampling and Fluorescence in situ Hybridization for Rapid Detection of Salmonella on Fresh Produce
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Cited by 17 •
2010
This protocol describes a simple adhesive-tape-based approach for sampling of tomato and other fresh produce surfaces, followed by rapid whole cell detection of Salmonella using fluorescence in situ hybridization (FISH).
FAQs
The assay converts nitrite into a colored product through two linked reactions. Under acidic conditions, nitrite reacts with sulfanilamide to form a diazonium compound. That intermediate then couples with N-(1-naphthyl)ethylenediamine, producing an azo dye. The resulting color provides the measurable signal used for estimating the original nitrite concentration.
Acidity is a required reaction condition because the initial interaction between nitrite and sulfanilamide occurs under acidic conditions. The assay then relies on N-(1-naphthyl)ethylenediamine to couple with the diazonium compound. Keeping these chemical stages distinct clarifies why both reagents are needed to produce the visible azo-dye signal.
Standards provide reference color intensities against which an unknown sample can be compared. After the azo dye forms, the sample’s color intensity is evaluated relative to those standards, allowing an estimate of nitrite concentration rather than merely indicating presence. This comparison turns the reaction’s visual signal into a measurement.
Colorimetric detection uses the Griess reaction and compares color with standards, making it suitable for estimating nitrite concentration. Electrochemical and optical approaches extend the measurement toolkit when rapid or continuous monitoring is important. The choice therefore depends on whether a study needs a reaction-based estimate or ongoing observation of nitrite-related changes.
A basic workflow starts with a biological, environmental, or food sample, followed by the Griess reagents under acidic conditions. Sulfanilamide reacts with nitrite first, and N-(1-naphthyl)ethylenediamine is then added for coupling. The resulting color is compared with standards to estimate concentration, linking chemical development with quantitative interpretation.
Measured nitrite can serve as an indicator of processes within nitrogen cycling and microbial metabolism. Comparing nitrite levels among biological or environmental samples can help researchers assess whether microbial activity is associated with changes in nitrite. The assay provides a chemical readout that connects biological processes with an observable sample measurement.
In water studies, nitrite measurements help evaluate water quality and related nitrogen cycling. In food research, the same analytical target supports investigation of food preservation. These applications use the concentration estimate for different purposes: environmental interpretation in one case and assessment of a preservation-related context in the other.
Nitrite measurements can provide context for nitric oxide-related processes because nitrite is identified as a useful analyte in that biological setting. Researchers can pair concentration estimates with studies of nitric oxide biology while interpreting the result as a measurement of nitrite, rather than as a direct measurement of every process involving nitric oxide.