✦ LIBER ✦

A blue chemiluminescence in the reaction of umbelliferone with hypochlorite

✍ Scribed by Slawinska, Danuta ;Slawinski, Janusz

Publisher: John Wiley and Sons
Year: 1995
Weight: 501 KB
Volume: 10
Category: Article
ISSN: 0884-3996
DOI: 10.1002/bio.1170100403

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✦ Synopsis

A strongly fluorescing 7-hydroxycoumarin (umbelliferone, U) oxidized in dilute (IOpmol/L-O. 1 mol/L) aqueous solution with CIO-or CIO-+ H 2 0 2 (but not with H202 alone) produces a strong chemiluminescence (CL). Light emission kinetics depends on the pH of solution (4.0-10.5) and the reaction has a low activation energy E, = 31 * 2 kJ/mol (285-310 K). The spectrum covers the fluorescence of umbelliferone (400-550nm. A , , , 460nm). No red emission typical of 'Ag, ' X ' g (02)2 is observed either in the umbelliferone +CIO-or the umbelliferone +CIO-+ H202 solution. The possible mechanism of CL and concomitant degradative oxidation of umbelliferone is discussed.

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