What is "purpurin"

Purpurin \Pur"pu*rin\, n. (Chem.) A dyestuff resembling alizarin, found in madder root, and extracted as an orange or red crystalline substance.

alt. 1 A red anthraquinone dye, extracted from madder, that is used as a biological stain 2 (context biochemistry English) A protein of the lipocalin family 3 A brownish or deep red decorative glass used in ancient times n. 1 A red anthraquinone dye, extracted from madder, that is used as a biological stain 2 (context biochemistry English) A protein of the lipocalin family 3 A brownish or deep red decorative glass used in ancient times

Purpurin or purpurine may refer to:

• 1,2,4-Trihydroxyanthraquinone, a natural red/yellow dye found in the madder plant
• Purpurin (protein), a protein, belonging to the lipocalin family
• Purpurin (glass), a red or reddish-brown ancient type of glass
• Purpurine, an earlier, but still occasionally seen, name for uroerythrin, the pink/red precipitate from urine

In biochemistry, purpurin is a protein, belonging to the lipocalin family of proteins.

The Lipocalins: A Review. The Edward Jenner Institute for Vaccine Research.

It binds glycosaminoglycan as well as a retinol.

Purpurin (Italian: Porporino; Latin: Haematinum, derived from Greek haimátinos = "of blood"; German: Hämatinon), sometimes referred to as glass porphyr, is an opaque glass of brownish to lustrous deep-reddish color which in classical antiquity was used for residential luxury objects, mosaics and various decorative purposes. Purpurin is somewhat harder than normal glass but can be easily cut and polished. Its red color is permanently lost upon smelting. The material bears some resemblance to goldstone.