alkannin
The major red dye derived from alkanet; used as an astringent, and in cosmetics and foods; can be used as an indicator : red at pH 6.8, changing to purple at pH 8.8 and blue at pH 10.0; also used as a fat stain. SYN: anchusin.

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al·kan·nin al-'kan-ən n a red crystalline coloring matter C16H16O5 obtained from alkanet and used chiefly in coloring beverages and fatty and oily pharmaceutical and cosmetic preparations

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al·kan·nin (alґkə-nin) a red powder, the coloring ingredient of alkanet; used as a colorant and, in the form of alkannin paper, as an indicator: alkalis turn the paper blue, acids red.

Medical dictionary. 2011.

Look at other dictionaries:

  • Alkannīn — Alkannīn, s. Alkannarot …   Meyers Großes Konversations-Lexikon

  • Alkannin — Alkannīn, Alkannarot, Anchusin, Anchusarot, Anchusasäure, der in der Rinde der Alkannawurzel enthaltene schöne rote Farbstoff …   Kleines Konversations-Lexikon

  • Alkannin —   [durch spanische Vermittlung aus arabisch al ḥinnā »Henna«] das, s, vom Naphthochinon abgeleiteter roter Naturfarbstoff, der aus der Alkannawurzel (Alkanna tinctoria) durch Extraktion mit Petroläther, Aufnehmen des Extraktes mit Natronlauge… …   Universal-Lexikon

  • Alkannin — Strukturformel Allgemeines Name Alkannin Andere Namen Anchus …   Deutsch Wikipedia

  • alkannin — /al kan in/, n. Chem. a dark red, amorphous, water insoluble powder, C16H16O5, obtained from the root of the alkanet: used chiefly for coloring fats, oils, and pharmaceuticals. [ < NL alkann(a) < ML alchanna (see ALKANET) + IN2] * * * …   Universalium

  • Alkannin — Al|kan|nin das; s <zu ↑...in> ein roter Naturfarbstoff …   Das große Fremdwörterbuch

  • alkannin — n. chemical substance used as a coloring agent …   English contemporary dictionary

  • alkannin — al·kan·nin …   English syllables

  • alkannin — alˈkanə̇n noun ( s) Etymology: International Scientific Vocabulary alkann (from New Latin Alkanna) + in : a red crystalline coloring matter C16H16O5 obtained from alkanet and used chiefly in coloring beverages and fatty and oily pharmaceutical… …   Useful english dictionary

  • alkannin paper — filter paper dipped in an alcoholic solution of alkannin; alkalis turn it blue, acids red …   Medical dictionary

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