Gas chromatography-mass spectrometry analysis of pheomelanin degradation products
2009 (English)In: Journal of Chromatography A, ISSN 0021-9673, Vol. 1216, no 30, 5730-5739 p.Article in journal (Refereed) Published
Melanoma is most rapidly increasing in the white population and people with pheomelanin skin type are at high risk to develop melanoma. However, little is known about the pheomelanin structure and function, and further elucidation of this melanin is therefore an important task. A GC/MS method was developed based on hydriodic acid hydrolysis of pheomelanin in the urine. Derivatization was performed with ethyl chloroformate and ethanol:pyridine (4:1, v/v). N,O-Ethoxycarbonyl-ethyl esters were extracted with chloroform and analyzed by GC/MS. 4-Amino-3-hydroxyphenylaianine and 3-amino4-hydroxyphenylaianine together with one benzothiazinone and two benzothiazole compounds were detected and identified in hydrolyzed samples of synthetic pheomelanin and melanin from the urine of a patient with melanoma. These findings strongly suggest that heterocyclic pheomelanin-type units are incorporated in the pigment structures.
Place, publisher, year, edition, pages
2009. Vol. 1216, no 30, 5730-5739 p.
Alkyl chloroformate; Aminohydroxyphenylalanine; Derivatization; Gas chromatography-mass spectrometry; Melanin; Melanoma; Pheomelanin; 7-(2-Amino-2-carboxyethyl)-5-hydroxy-3, 4-dihydro-2H-1, 4-benzothiazine-3-one 6-(2-Amino-2-carboxyethyl)-4-hydroxybenzothiazole 6-(2-Amino-2-carboxyethyl)-4-hydroxy-2-methyl-benzothiazole; Benzothiazine; Benzothiazole; Benzothiazinone
Medical and Health Sciences
IdentifiersURN: urn:nbn:se:liu:diva-20135DOI: 10.1016/j.chroma.2009.05.063OAI: oai:DiVA.org:liu-20135DiVA: diva2:233390