Lc-ms Identification
Lc-ms Identification - Related Videos
14:12
Rodent Identification II
0 Views •
2015
Source: Kay Stewart, RVT, RLATG, CMAR; Valerie A. Schroeder, RVT, RLATG. University of Notre Dame, IN Animal records must be accurately maintained to ensure that data collection is correct. Records range from maintaining information on cage cards to having a detailed database with all of the relevant information on each animal. The primary component of recordkeeping is the individual identification of research animals. There are a variety of methods suitable for identifying mice and rats. This...
11:09
Rodent Identification I
0 Views •
2015
Source: Kay Stewart, RVT, RLATG, CMAR; Valerie A. Schroeder, RVT, RLATG. University of Notre Dame, IN A fundamental requirement of biomedical research is the proper identification of research animals. It is essential that the right animal is utilized for procedures and data collection. Laboratory mice and rats can be identified with the following permanent methods: ear tags, ear punch codes, microchip implantation, tail tattoos for adult mice, and toe tattoos for neonates. Temporary methods of...
12:06
Tree Identification: How To Use a Dichotomous Key
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2023
Source: Laboratories of Margaret Workman and Kimberly Frye - Depaul University A dichotomous key is a tool that identifies items in nature, such as leaves. This method is based on the idea of choosing between two characteristics. The word dichotomous comes from two Greek words that mean “to divide into two parts.” In a dichotomous key for leaf identification, each pair of phrases describes different features of the leaf. Only one of the phrases correctly applies to the leaf being keyed out. The...
08:27
Sampling and Identification of Microplastics in Groundwater
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2025
Here, we provide a detailed description of sampling groundwater from a borehole for microplastics analysis using a patented sampling system developed for this purpose. The protocol details the methods for sampling microplastics from boreholes, as well as the separation and chemical identification of microplastics.
09:37
Helminth Collection and Identification from Wildlife
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Cited by 51 •
2013
Wild animals are commonly parasitized by a wide range of helminths. The four major types of helminths are “roundworms” (nematodes), “thorny-headed worms” (acanthocephalans), “flukes” (trematodes), and “tapeworms” (cestodes). Here we describe how helminths are collected from a vertebrate animal and how they are preserved and taxonomically...
FAQs
The separation stage reduces the complexity of a biological sample before mass analysis. Compounds are resolved according to properties such as polarity and affinity for the stationary phase, so different molecular components reach the mass spectrometer in distinguishable chromatographic contexts. This improves the ability to examine metabolites, peptides, lipids, and other biomolecules within complex mixtures.
Ionization converts separated compounds into charged particles that the mass spectrometer can analyze. The instrument sorts these particles according to their mass-to-charge ratios and records characteristic spectra. Those spectral signals provide molecular patterns that can be compared with reference information, allowing researchers to distinguish and identify components measured from biological samples.
Measured signals are interpreted by comparison with reference databases or standards. A database provides reference information for matching observed spectral features, while a standard supplies a known comparison point for a particular compound. These comparisons connect instrument signals with candidate molecular identities rather than treating every detected signal as an unidentified biological component.
The workflow begins with a biological sample, followed by liquid-chromatographic separation of its compounds. The separated molecules are then ionized, sorted by mass-to-charge ratio, and recorded as spectra. Researchers evaluate the resulting signals against reference databases or standards to assign identities to detected metabolites, peptides, lipids, or other biomolecules.
Biological samples contain multiple molecular classes whose signals may be difficult to interpret without separation and mass-based analysis. LC-MS identification combines chromatographic resolution with characteristic spectral measurements, helping researchers examine metabolites, peptides, lipids, and other biomolecules in the same general analytical framework. This makes the approach valuable when studying molecular composition in complex samples.
In biology, the approach can support investigations of cellular pathways, protein function, disease-associated molecular changes, and drug metabolism. Its measurements help reveal which biomolecules are present and how molecular patterns differ across biological contexts. These results provide information for connecting observed chemical changes with cellular processes, functional questions, or responses to drugs and disease.