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Nile red (also known as Nile blue oxazone) is a lipophilic stain. Nile red stains intracellular lipid droplets yellow. In most polar solvents, Nile red will not fluoresce; however, when in a lipid-rich environment, it can be intensely fluorescent, with varying colors from deep red (for polar membrane lipid) to strong yellow-gold emission (for neutral lipid in intracellular storages).
The structure of phenoxazine consists of an oxazine fused to two benzene rings. It occurs as the central core of a number of naturally occurring chemical compounds such as dactinomycin [2] and litmus. The dyes Nile blue and Nile red are also based on a phenoxazine core.
Nile red (also known as Nile blue oxazone) is formed by boiling Nile blue with sulfuric acid. This produces a mix of Nile red and Nile blue. Nile red is a lipophilic stain; it will accumulate in lipid globules inside cells, staining them red. Nile red can be used with living cells.
The FDA has banned the use of red dye No. 3 in foods and medications. The additive was previously banned in cosmetics. Red dye No. 3 should be removed from foods by January 2027. The U.S. Food and ...
Red No. 3 is banned for food use in Europe, Australia and New Zealand, except in certain kinds of cherries. The dye will be banned in California starting in January 2027, and lawmakers in ...
Acid Red 13: Fast red E Acid red 13 16045 azo 2302-96-7: Acid red 25 Acid red 25 16050 azo 5858-93-5: Acid red 88: Fast red A Acid red 88 15620 azo 1658-56-6: Acid Red 95 Erythrosine Y Diiodofluorescein Acid red 95 45425 xanthene 33239-19-9: Acridine orange: Euchrysine Basic Orange 14 46005 acridine: 494-38-2: Acridine red 3B 45000 pyronin 2465 ...
The FDA banned the use of red dye No. 3 in foods and medicines sold in the U.S. because it has been shown to cause cancer in rats. The action highlights the limits of a federal law known as the ...
Congo red solid and in water solution. Congo red is an organic compound, the sodium salt of 3,3′-([1,1′-biphenyl]-4,4′-diyl)bis(4-aminonaphthalene-1-sulfonic acid). It is an azo dye. Congo red is water-soluble, yielding a red colloidal solution; its solubility is greater in organic solvents.