Linked Life Data

17371439

Source:http://linkedlifedata.com/resource/pubmed/id/17371439

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
2
pubmed:dateCreated
2007-3-20
pubmed:abstractText
A procedure for analysis of melanin-pigmented tissues based on alkaline hydrogen peroxide degradation coupled with high-performance liquid chromatography (HPLC) ultraviolet determination of pyrrole-2,3,5-tricarboxylic acid (PTCA) for eumelanin and 6-(2-amino-2-carboxyethyl)-2-carboxy-4-hydroxybenzothiazole (BTCA) and 1,3-thiazole-2,4,5-tricarboxylic acid for pheomelanin was recently developed. Despite advantages related to the degradation conditions and sample handling, a decrease of the reproducibility and resolution was observed after several chromatographic runs. We report herein an improved chromatographic methodology for simultaneous determination of PTCA and BTCA as representative markers of eumelanin and pheomelanin, respectively, based on the use of an octadecylsilane column with polar end-capping with 1% formic acid (pH 2.8)/methanol as the eluant. The method requires conventional HPLC equipments and gives very good peak shapes and resolution, without need of ion pair reagents or high salt concentrations in the mobile phase. The intra-assay precision of the analytical runs was satisfactory with CV values < or = 4.0% (n = 5) for the two markers which did not exceed 8% after 50 consecutive injections on the column over 1 week. The peak area ratios at 254 and 280 nm (A(280)/A(254): PTCA = 1.1, BTCA = 0.6) proved a valuable parameter for reliable identification of the structural markers even in the most complex degradation mixtures. The method can be applied to various eumelanin and pheomelanin pigmented tissues, including mammalian hair, skin and irides, and is amenable to be employed in population screening studies.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Apr
pubmed:issn
0893-5785
pubmed:author
pubmed:issnType
Print
pubmed:volume
20
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
128-33
pubmed:meshHeading
pubmed:year
2007
pubmed:articleTitle
An easy-to-run method for routine analysis of eumelanin and pheomelanin in pigmented tissues.
pubmed:affiliation
Department of Organic Chemistry and Biochemistry, University of Naples Federico II, Naples, Italy.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't, Evaluation Studies