Quantification of Naturally Occurring Pyrrole Acids in Melanosomes
摘要:
AbstractThree naturally occurring pyrrole acids were found in Sepia, human black hair, and bovine choroid and iris melanosomes using high‐performance liquid chromatography and mass spectrometry—pyrrole‐2,3‐dicarboxylic acid (PDCA), pyrrole‐2,3,5‐tricarboxylic acid (PTCA) and pyrrole‐2,3,4,5‐tetracarboxylic acid (PTeCA). PDCA and PTCA are common markers quantified from oxidative degradation of eumelanins. Using standards, the amounts of naturally occurring PDCA and PTCA were determined and compared to those obtained following peroxide oxidation of the same samples. Because the naturally occurring acids are water soluble, these results indicate that care must be exercised when comparing PDCA and PTCA yields from the degradation analyses of melanins isolated and prepared by different methods. This work also establishes that PTeCA is a naturally occurring pyrrole acid in melanosomes.
,, ... und ehrt mir ihre Kunst!“ – Evaluierung historischer und neuer Synthesewege zu 1,5-Dihydroxy-6-oxo-1,6-dihydropyridin-2-carbonsäure und 1,3-Dihydroxy-2-oxo-3-pyrrolin-4-carbonsäure / “. . . and honour their art!” – Evaluation of Historical and New Routes to 1,5-Dihydroxy-6-oxo-1,6- dihydropyridine-2-carboxylic Acid and 1,3-Dihydroxy-2-oxo-3-pyrroline-4-carboxylic Acid
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„... und ehrt mir ihre Kunst!“ – 评估历史和新的合成途径到1,5-二羟基-6-酮基-1,6-二氢吡啶-2-羧酸和1,3-二羟基-2-酮基-3-吡咯烯-4-羧酸 / “. . . and honour their art!” – 评估历史和新的合成途径到1,5-二羟基-6-酮基-1,6-二氢吡啶-2-羧酸和1,3-二羟基-2-酮基-3-吡咯烯-4-羧酸