title: Characterization of N-terminal formaldehyde adducts to hemoglobin.
abstract: A procedure to prepare and purify adducts of formaldehyde (FA) to the N-terminus of peptides was developed. FA-VHLTPEEK and FA-VLSPADK were produced with purities >95% upon incubation of the peptides with FA in phosphate-buffered saline (PBS) at a pH level of 7.4. The peptides were purified by preparative liquid chromatography and were characterized by their retention times in liquid chromatography, their fragmentation patterns obtained by tandem mass spectrometry, and their accurate mass and nuclear magnetic resonance measurements. This is the first time an imidazolidone-type structure has been reported for FA adducts. The same peptides were identified in tryptic digests of human hemoglobin incubated with FA at physiological conditions and in human hemoglobin specimens. These peptides are suitable for use as calibrators for the quantitative assessment of internal exposure to FA.
authors: Division of Laboratory Sciences, National Center for Environmental Health, Centers for Disease Control and Prevention, Atlanta, GA 30341, USA. MOspina@cdc.gov
authors: Maria
authors: M
authors: Ospina
authors: Alina
authors: A
authors: Costin
authors: Adrienne K
authors: AK
authors: Barry
authors: Hubert W
authors: HW
authors: Vesper
mesh_terms: D005557:Formaldehyde / Q000737:chemistry*; D006454:Hemoglobins / Q000737:chemistry* / Q000378:metabolism; D006801:Humans; D048289:Imidazolidines / Q000737:chemistry; D010446:Peptide Fragments / Q000737:chemistry* / Q000378:metabolism; D053719:Tandem Mass Spectrometry; D014357:Trypsin / Q000378:metabolism
chemical_list: D006454:Hemoglobins; D048289:Imidazolidines; D010446:Peptide Fragments; D005557:Formaldehyde; D014357:Trypsin