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Related Concept Videos

Gas Chromatography–Mass Spectrometry (GC–MS)01:14

Gas Chromatography–Mass Spectrometry (GC–MS)

Gas chromatography–mass spectrometry (GC–MS) is the combination of analytical techniques of gas chromatography and mass spectrometry in a single instrument for analyzing a mixture of compounds. The gas chromatograph separates the compounds in the mixture, and the mass spectrometer analyzes each compound separately to determine the molecular masses and molecular structures.
A gas chromatograph consists of a long, narrow capillary column with a polysiloxane coating on the inner wall. The coating...
Chemical Symbols01:09

Chemical Symbols

A chemical symbol is an abbreviation that is used to indicate an element or an atom of an element. For example, the symbol for mercury is Hg. We use the same symbol to indicate one atom of mercury (microscopic domain) or to label a container of many atoms of the element mercury (macroscopic domain).
Some symbols are derived from the common name of the element; others are abbreviations of the name in another language. Most symbols have one or two letters, but three-letter symbols have been used...
Chemical Shift: Internal References and Solvent Effects01:17

Chemical Shift: Internal References and Solvent Effects

In an NMR sample, precise measurement of the absolute absorption frequencies of nuclei is difficult. A standard internal reference compound is added, and the frequency difference between the reference signal and sample signals is measured.
The internal reference compound generally used in NMR spectroscopy is tetramethylsilane (TMS). TMS is preferred because it is chemically inert, soluble in NMR solvents, and easily removable. Also, the highly shielded methyl protons in TMS yield an intense...
π Electron Effects on Chemical Shift: Overview01:27

π Electron Effects on Chemical Shift: Overview

An applied magnetic field causes loosely bound π-electrons in organic molecules to circulate, producing a local or induced diamagnetic field over a large spatial volume. As the molecules tumble in solution, the field generated by π-electrons in spherical substituents results in a zero net field. However, the net field generated by π-electrons in non-spherical substituents is not zero. The effect of this induced field depends on the orientation of the molecule with respect to B0, resulting in...
NMR Spectrometers: Overview01:20

NMR Spectrometers: Overview

NMR spectrometers consist of a strong magnet, a radiofrequency transmitter, and a detector attached to a computer console for recording spectra of samples containing NMR-active nuclei. In first-generation NMR instruments called continuous-wave spectrometers, the resonance frequencies of the nuclei are determined by frequency-sweep or field-sweep methods. The magnetic field strength is fixed and the rf signal is swept in the former, while the radiofrequency signal is fixed and the magnetic field...
Predicting Molecular Geometry02:27

Predicting Molecular Geometry

VSEPR Theory for Determination of Electron Pair Geometries

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Mass Spectrometry-Guided Genome Mining as a Tool to Uncover Novel Natural Products
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Published on: March 12, 2020

ChemGPS-NP(Web): chemical space navigation online.

Josefin Rosén1, Anders Lövgren, Thierry Kogej

  • 1Division of Pharmacognosy, Department of Medicinal Chemistry, Uppsala University, BMC Box 574, 75123 Uppsala, Sweden. josefin.rosen@fkog.uu.se

Journal of Computer-Aided Molecular Design
|December 17, 2008
PubMed
Summary
This summary is machine-generated.

Medicinal chemists can now explore vast chemical spaces using ChemGPS-NP(Web), a new online tool. This chemical navigation platform aids in drug discovery by mapping compounds based on properties, facilitating library analysis and compound prioritization.

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Time-resolved ElectroSpray Ionization Hydrogen-deuterium Exchange Mass Spectrometry for Studying Protein Structure and Dynamics

Published on: April 17, 2017

Area of Science:

  • Computational chemistry
  • Medicinal chemistry
  • Drug discovery

Background:

  • The internet is a vital resource for medicinal chemists and drug discoverers.
  • Efficient navigation and analysis of chemical space are crucial for drug discovery.
  • Existing tools may lack comprehensive mapping and consistent analysis capabilities for large datasets.

Purpose of the Study:

  • Introduce ChemGPS-NP(Web), a novel web-based tool for chemical space navigation.
  • Demonstrate the utility of ChemGPS-NP(Web) in analyzing and comparing large compound datasets.
  • Validate the tool's application in interpreting biological assay results and exploring chemical similarity hypotheses.

Main Methods:

  • Development of a web-based public tool, ChemGPS-NP(Web).
  • Global mapping of chemical space onto an eight-dimensional map of physico-chemical characteristics.
  • Application of the tool to analyze datasets from biological assays (pyruvate kinase, Bcl-2 family).
  • Testing a hypothesis on chemical similarity between betalains and muscaflavins.

Main Results:

  • ChemGPS-NP(Web) provides comprehensive chemical space navigation and exploration.
  • The tool facilitates compound selection, prioritization, and property analysis.
  • ChemGPS-NP(Web) successfully assisted in interpreting biological assay data and evaluating chemical similarity.

Conclusions:

  • ChemGPS-NP(Web) is a valuable resource for medicinal chemists and drug discoverers.
  • The tool enables consistent analysis and comparison of chemical libraries.
  • ChemGPS-NP(Web) aids in understanding structure-activity relationships and guiding drug design efforts.