Formulation: A solid
Formal Name: 2′,4′,5′,7′-tetrabromo-3′,6′-dihydroxy-spiro[isobenzofuran-1(3H),9′-[9H]xanthen]-3-one
Formula Markup: C20H8Br4O5
Formula Weight: 647,9
Shelf life (days): 1460
CAS Number: 15086-94-9
Notes: Eosin Y is a dye and brominated derivative of the fluorescent compound fluorescein.{69778} It exists as a tautomer in aqueous solutions.{68277,69778} Eosin Y has minimal pH dependence at physiological pH and has commonly been used in hematoxylin and eosin (H&E) staining to stain the extracellular matrix and cytoplasmic proteins.{68278,68279} It displays absorption/emission maxima of 526/544 nm, respectively.{68276} It has also been used as a photoredox catalyst in organic synthesis reactions, including for cyclization and the formation of carbon-carbon or carbon-non-carbon bonds, and as a cooperative catalyst with transition metals.{69778} Eosin Y (100 µM) non-selectively inhibits histone methyltransferases.{68280} Formulations containing eosin Y have been used in the screening of cervical cancer as part of the Papanicolaou (Pap) staining process.
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