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Related Concept Videos

Classification of Elements and Compounds02:54

Classification of Elements and Compounds

Pure substances consist of only one type of matter. A pure substance can be an element or a compound. An element consists of only one type of atom, while a compound consists of two or more types of atoms held together by a chemical bond. Elements are classified as atomic or molecular based on the nature of their basic units.
Compounds are pure substances composed of two or more elements in fixed, definite proportions. Compounds are classified as ionic or molecular (covalent) based on the bonds...
Polymer Classification: Architecture01:14

Polymer Classification: Architecture

Polymers are classified as linear or branched on the basis of their chain architecture. The polymer chains in linear polymers have a long chain-like structure with minimal to no branching at all. Even if a polymer features large substituent groups on the monomer, which appear as branches to the skeleton, it is not considered a branched polymer. A branched polymer contains secondary polymer chains that arise from the main polymer chain. The branching occurs when the polymer growth shifts from...
Organic Compounds03:02

Organic Compounds

All living things are formed mostly of carbon compounds called organic compounds. The category of organic compounds includes both natural and synthetic compounds that contain carbon. Although a single, precise definition has yet to be identified by the chemistry community, most agree that a defining trait of organic molecules is the presence of carbon as the principal element, bonded to hydrogen and other carbon atoms. However, some carbon-containing compounds such as carbonates, cyanides, and...
Classification of Neurotransmitters01:30

Classification of Neurotransmitters

Neurotransmitters play a crucial role in the communication between neurons in the autonomic nervous system. Neurons in the autonomic nervous system can be cholinergic or adrenergic depending on the neurotransmitters synthesized. Cholinergic neurons use acetylcholine as their primary neurotransmitter. This includes all the preganglionic fibers of the sympathetic and pre- and postganglionic fibers of the parasympathetic nervous systems. In addition, neurons of the somatic nervous system also use...
Polymer Classification: Stereospecificity01:26

Polymer Classification: Stereospecificity

Polymerization generates chiral centers along the entire backbone of a polymer chain. Accordingly, the stereochemistry of the substituent group has a significant effect on polymer properties. Polymers formed from monosubstituted alkene monomers feature chiral carbons at every alternate position in the polymer backbone. Relative to the predominant orientation of substituents at the adjacent chiral carbons, the polymer can exist in three different configurations: isotactic, syndiotactic, and...
Classification of Titrimetric Analysis Based on Reaction Types01:01

Classification of Titrimetric Analysis Based on Reaction Types

Titrimetric analysis in solution chemistry involves measuring the volume of solutions and is often called volumetric analysis. The standard solution of known concentration in the burette is called the titrant, whereas the solution of unknown concentration in the flask is called the analyte, or titrand. Titrimetric analyses can be classified into four types based on the reactions between the titrant and analyte.
Titrations between an acid and a base lead to neutralization reactions that form...

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Applying Cheminformatics to Develop a Structure Searchable Database of Analytical Methods
05:34

Applying Cheminformatics to Develop a Structure Searchable Database of Analytical Methods

Published on: June 6, 2025

Automated compound classification using a chemical ontology.

Claudia Bobach1, Timo Böhme, Ulf Laube

  • 1OntoChem GmbH, Heinrich-Damerow-Str, 4, Halle/Saale, D-06120, Germany. lutz.weber@ontochem.com.

Journal of Cheminformatics
|January 1, 2013
PubMed
Summary
This summary is machine-generated.

Automated chemical classification is enhanced by a new ontology using extended structure-based reasoning. This method precisely defines compound classes, enabling accurate, computer-interpretable assignments in databases and text.

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Applying Cheminformatics to Develop a Structure Searchable Database of Analytical Methods
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Published on: April 18, 2019

Area of Science:

  • Computational chemistry
  • Cheminformatics
  • Bioinformatics

Background:

  • Chemical compound classification aids property evaluation in databases.
  • Existing ontologies like MeSH and ChEBI manually classify compounds.
  • Manual classification is time-consuming and error-prone for large datasets.

Purpose of the Study:

  • To develop an automated, high-quality compound classification method.
  • To construct a chemical ontology supporting precise class definitions.
  • To overcome limitations of manual compound classification.

Main Methods:

  • Extended SMARTS (SMILES ARithmetic/ARomatics) expressions for enhanced reasoning.
  • Utilized logical operators (OR, NOT, AND) for precise class definitions.
  • Implemented flexible atom lists and stereochemistry definitions.

Main Results:

  • Developed a multi-hierarchical chemical ontology.
  • Achieved precise and granular chemical class definitions.
  • Demonstrated automated compound annotation using a prototypic ontology.

Conclusions:

  • Proposed a rule-based definition for precise chemical class definition.
  • Enabled translation of expert knowledge into computer-interpretable logic.
  • Facilitated automated compound classification in databases and text documents.