Fluorescin
Title: Fluorescin
CAS Registry Number: 518-44-5
CAS Name: 2-(3,6-Dihydroxy-9H-xanthen-9-yl)benzoic acid
Additional Names: resorcinolphthalin
Molecular Formula: C20H14O5
Molecular Weight: 334.32
Percent Composition: C 71.85%, H 4.22%, O 23.93%
Literature References: Obtained by heating fluorescein with NaOH and zinc dust. Formation by Pseudomonas aeruginosa: King et al., Can. J. Res. 26C, 514 (1948); Totter, Moseley, J. Bacteriol. 65, 45 (1953).
Properties: Bright yellow powder, mp 125-127°. Readily oxidizes to fluorescein. Practically insol in water. Sol in alkali hydroxides or carbonates, alcohol, ether. Keep well closed.
Melting point: mp 125-127°
Use: Reagent for oxidases, peroxides.

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