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OXIDATION PATHWAYS OF NATURAL DYE HEMATOXYLIN IN AQUEOUS SOLUTION
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SYSNO ASEP 0354402 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název OXIDATION PATHWAYS OF NATURAL DYE HEMATOXYLIN IN AQUEOUS SOLUTION Tvůrce(i) Sokolová, Romana (UFCH-W) RID, ORCID, SAI
Degano, I. (IT)
Hromadová, Magdaléna (UFCH-W) RID, ORCID, SAI
Kocábová, Jana (UFCH-W) RID
Gál, Miroslav (UFCH-W)
Valášek, Michal (UOCHB-X)Zdroj.dok. Collection of Czechoslovak Chemical Communications. - : Ústav organické chemie a biochemie AV ČR, v. v. i. - ISSN 0010-0765
Roč. 75, č. 11 (2010), s. 1097-1114Poč.str. 18 s. Jazyk dok. eng - angličtina Země vyd. CZ - Česká republika Klíč. slova hemotoxylin ; oxidation ; dye degradation ; cyclic voltammetry Vědní obor RIV CG - Elektrochemie CEP GA203/09/1607 GA ČR - Grantová agentura ČR GA203/08/1157 GA ČR - Grantová agentura ČR OC 140 GA MŠMT - Ministerstvo školství, mládeže a tělovýchovy CEZ AV0Z40400503 - UFCH-W (2005-2011) AV0Z40550506 - UOCHB-X (2005-2011) UT WOS 000284230500003 DOI 10.1135/cccc2010096 Anotace 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 electron oxidation 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. Pracoviště Ústav fyzikální chemie J.Heyrovského Kontakt Michaela Knapová, michaela.knapova@jh-inst.cas.cz, Tel.: 266 053 196 Rok sběru 2011
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