Indicators and Reagents

Substances used for the detection, identification, analysis, etc. of chemical, biological, or pathologic processes or conditions. Indicators are substances that change in physical appearance, e.g., color, at or approaching the endpoint of a chemical titration, e.g., on the passage between acidity and alkalinity. Reagents are substances used for the detection or determination of another substance by chemical or microscopical means, especially analysis. Types of reagents are precipitants, solvents, oxidizers, reducers, fluxes, and colorimetric reagents. (From Grant & Hackh's Chemical Dictionary, 5th ed, p301, p499) (MeSH)


Benzoquinone Benzoquinone Benzene rings which contain two ketone moieties in any position. They can be substituted in any position except at the ketone groups. (MeSH) Links * ベンゾキノン en:indicators_and_reagents en:oxidation-reduction ,