Endpoint Detection
Endpoint Detection - Related Videos
01:19
Precipitation Titration: Endpoint Detection Methods
0 Views •
2025
In argentometric precipitation titrations, endpoints can be detected visually by the Mohr, Volhard, and Fajans methods. In the Mohr method, adding a soluble chromate indicator gives an initial yellow color to the analyte solution. As the titrant is added, the first excess of silver ions forms a red silver chromate precipitate, marking the endpoint. The solution pH should be maintained at about 8 by adding solid CaCO3. In the Volhard method, a standard excess of AgNO3 is first added to the...
07:05
Important Endpoints and Proliferative Markers to Assess Small Intestinal Injury and Adaptation using a Mouse Model of Chemotherapy-Induced Mucositis
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Cited by 9 •
2019
Here, we present a protocol to establish important endpoints and proliferative markers of small intestinal injury and compensatory hyperproliferation using a model of chemotherapy-induced mucositis. We demonstrate the detection of proliferating cells using a cell cycle specific marker and using small intestinal weight, crypt depth, and villus height as endpoints.
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).
07:19
High Sensitivity 5-hydroxymethylcytosine Detection in Balb/C Brain Tissue
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Cited by 56 •
2011
The EpiMark 5-hmC and 5-mC Analysis Kit can be used to analyze and quantitate 5-methylcytosine and 5-hydroxymethylcytosine within a spe cific locus. The kit distinguishes 5-mC from 5-hmC by the addition of glucose to the hydroxyl group of 5-hmC via an enzymatic reaction utilizing β-glucosyltransferase (T4-BGT). When 5-hmC occurs In the context of CCGG, this modification converts a cleavable MspI site to a non-cleavable site.
09:00
Detection of Protein Ubiquitination
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Cited by 96 •
2009
Ubiquitination is a key posttranslational modification carried out by a set of three enzymes. Mutations of genes involved in this modification are associated with many different human diseases. Here, we describe protocols to detect protein ubiquitination in cultured cells in vivo and test tubes in vitro.
FAQs
Accuracy depends on matching the detection signal to the reaction being monitored. A visible indicator provides a color-based response, whereas pH, potential, conductivity, or absorbance measurements provide instrumental signals. The chosen signal should change sharply as the titrant approaches completion, helping the observed endpoint remain close to the stoichiometric equivalence point.
An observed endpoint is an experimental signal, while the equivalence point is the reaction’s stoichiometric completion point. They may not coincide exactly because detection depends on how the indicator or instrument responds near completion. This distinction matters when calculating an unknown concentration, since endpoint error can shift the resulting quantitative value.
Across acid-base, redox, precipitation, and complexometric titrations, endpoint detection can use either a visible indicator or an instrumental signal. The relevant signal may be a color change, pH shift, potential shift, conductivity change, or absorbance change. This range lets chemists monitor different reaction systems without relying on one universal measurement.
A practical workflow starts with a sample containing the analyte, adds titrant, and tracks either a visible indicator or an instrumental measurement as the titrant is added. The chemist identifies the sharp color or signal change, records the endpoint, and uses the titration result to determine the unknown concentration or quantify the analyte.
Instrumental measurements convert changes during titrant addition into trackable signals, including pH, potential, conductivity, or absorbance. Rather than depending only on visual color recognition, the chemist can follow how the measured property shifts as completion approaches. That signal supports locating the endpoint and evaluating reaction behavior.
It provides a route from reaction behavior to quantitative chemical information. By locating the endpoint in a titration, chemists can determine unknown concentrations and quantify analytes, while the measured response can also help assess how the reaction behaves. These uses make endpoint detection relevant to both routine chemical measurement and interpretation of titration results.