OXIDATION PATHWAYS OF NATURAL DYE HEMATOXYLIN IN AQUEOUS SOLUTION

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388963%3A_____%2F10%3A00354402" target="_blank" >RIV/61388963:_____/10:00354402 - isvavai.cz</a>

Alternative codes found

RIV/61388955:_____/10:00354402

Result on the web

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DOI - Digital Object Identifier

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Result language

angličtina

Original language name

OXIDATION PATHWAYS OF NATURAL DYE HEMATOXYLIN IN AQUEOUS SOLUTION

Original language description

The oxidation mechanism of hematoxylin was studied in phosphate buffers and 0.1 M KCl by cyclic voltammetry and UV-Vis spectroscopy under deaerated conditions. The redox potential of hematoxylin in buffered solution strongly depends on pH. A two electronoxidation is preceded by deprotonation. The homogeneous rate of deprotonation process of hematoxylin in 0.1 M phosphate buffer is k(d) = (2.5 +/- 0.1) x 10(4) s(-1). The cyclic voltammetry under unbuffered conditions shows the distribution of various dissociation forms of hematoxylin. The dissociation constants pK(1) = 4.7 +/- 0.2 and pK(2) = 9.6 +/- 0.1 were determined using UV-Vis spectroscopy. The final oxidation product was identified by gas chromatography with mass spectrometry detection as hemathein. The distribution of oxidation products differs under buffered and unbuffered conditions. The dye degradation in natural unbuffered environment yields hemathein and hydroxyhematoxylin, which is absent in buffered solution.

Czech name

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Czech description

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Type

J_x - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)

CEP classification

CG - Electrochemistry

OECD FORD branch

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Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

Z - Vyzkumny zamer (s odkazem do CEZ)

Publication year

2010

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Collection of Czechoslovak Chemical Communications

ISSN

0010-0765

e-ISSN

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Volume of the periodical

75

Issue of the periodical within the volume

11

Country of publishing house

CZ - CZECH REPUBLIC

Number of pages

18

Pages from-to

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UT code for WoS article

000284230500003

EID of the result in the Scopus database

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