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Medical Definition of Alkannin
1. (-)-5,8-dihydroxy-2-(1-hydroxy-4-methyl-3-pentenyl)-1,4-naphthoquinone;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. Synonym: anchusin. (05 Mar 2000)
Lexicographical Neighbors of Alkannin
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