fluorescein

fluorescein
/floo res"ee in, flaw-, floh-/, n. Chem.
an orange-red, crystalline, water-insoluble solid, C20H12O5, that in alkaline solutions produces an orange color and an intense green fluorescence: used to trace subterranean waters and in dyes.
Also, fluoresceine. Also called resorcinolphthalein.
[1875-80; FLUORESCE + -IN2]

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▪ dye
also called  Resorcinolphthalein,  

      organic compound of molecular formula C20H12O5 that has wide use as a synthetic colouring agent. It is prepared by heating phthalic anhydride and resorcinol over a zinc catalyst, and it crystallizes as a deep red powder with a melting point in the range of 314° to 316° C (597° to 601° F). Fluorescein was named for the intense green fluorescence it imparts to alkaline solutions—a colour visible even at dilutions of 1:50,000,000. It is used as a dye to colour liquids in analytic instruments, in cosmetics, and as a water tracer or marker. Halogenated derivatives made from fluorescein also include eosin and erythrosin.

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Universalium. 2010.

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Look at other dictionaries:

  • fluorescein — fluo res ce*in, fluoresceine fluo res ce*ine, fluorescein flu o*res ce*[ i]n, n. (Chem.) A yellowish red, crystalline substance, {C20H12O5}, produced by heating together phthalic anhydride and resorcin; so called, from the very brilliant… …   The Collaborative International Dictionary of English

  • fluorescein — fluo res ce*in, fluoresceine fluo res ce*ine, fluorescein flu o*res ce*[ i]n, n. (Chem.) A yellowish red, crystalline substance, {C20H12O5}, produced by heating together phthalic anhydride and resorcin; so called, from the very brilliant… …   The Collaborative International Dictionary of English

  • fluorescein — fluorescèīn m <G fluoresceína> DEFINICIJA kem. C20H12O5 narančasti kristalni prah, u vodenoj otopini fluorescira zeleno ETIMOLOGIJA v. fluorescencija …   Hrvatski jezični portal

  • fluorescein —  Fluorescein  Флуоресцеин   Флуоресцентный краситель, флуоресцирующий в зеленой области при возбуждении синим или ультрафиолетовым светом. Разбавленный раствор этого вещества применяется для определения имеющихся дефектов на поверхности роговицы… …   Толковый англо-русский словарь по нанотехнологии. - М.

  • fluorescein — [flo͞o΄əres′ē in] n. [< FLUORESCE + IN1: from its bright fluorescence in solution] a yellowish red, crystalline compound, C20H12O5, made synthetically from resorcinol and phthalic anhydride: a dilute alkaline solution appears green by… …   English World dictionary

  • Fluorescein — Chembox new ImageFile = Fluoresceine.svg ImageSize = ImageFile2 = Fluorescein sample.jpg IUPACName = OtherNames = Fluorescein, resorcinolphthalein, C.I. 45350, solvent yellow 94, D C yellow no. 7, angiofluor, Japan yellow 201, soap yellow,… …   Wikipedia

  • Fluorescein — Strukturformel Allgemeines Name Fluorescein Andere Namen …   Deutsch Wikipedia

  • Fluorescein — Flu|o|res|ce|in [↑ Fluoreszenz u. ↑ in (3)], das; s; veraltetes Syn.: Resorcinphthalein: rote krist. oder gelbe amorphe Verb., Smp. 314 °C, deren wässrig alkalische oder alkoholische Lsg. grün fluoreszieren. Von dem Xanthenfarbstoff F. leiten… …   Universal-Lexikon

  • fluorescein — Fluorophore commonly used in microscopy. Fluorescein di acetate can be used as a vital stain, or can be conjugated to proteins (particularly antibodies) using isothiocyanate. Excitation is at 365nm, and the emitted light is green yellow (450… …   Dictionary of molecular biology

  • fluorescein — An orange red crystalline powder that yields a bright green fluorescence in solution, and is reduced to fluorescin; a nontoxic, water soluble indicator used diagnostically to trace water flow. SYN: resorcinol phthalic anhydride …   Medical dictionary

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