The carboxylic acid of which bixin is the methyl ester; more soluble in water than bixin.Norbixin is natural colour isolated from the seeds of the annatto tree (Bixa orellana ). Annatto is the name of the crude extract, whereas bixin is the fat-soluble colour and norbixin the water-soluble colour.Norbixin can be uesed as Food colour whose colour ranges from red to brown depending on the solvent used for extraction.
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