3 years ago

Fully international system of units-traceable glycated hemoglobin quantification using two stages of isotope-dilution high-performance liquid chromatography–tandem mass spectrometry

Glycated hemoglobin (HbA1c), defined as hemoglobin (Hb) molecules having a stable adduct of glucose on the N-terminal of the β-chains, has been endorsed as a diagnostic tool for diabetes mellitus and a prediction indicator for the development of diabetes complications. Here we describe an accurate procedure using two stages of isotope dilution-ultra performance liquid chromatography–tandem mass spectrometry (ID-LC–MS/MS) for the quantification of HbA1c that provides full traceability to International System of Units (SI). First, synthetic peptides representing specific markers of HbA1c (G-hexa) and hemoglobin A0 (Hexa) were certified by amino acid analysis via acid hydrolysis as reference materials (RMs) for the next step. For this peptide certification, three amino acids (proline, valine, and leucine) were determined by hydrolysis with 10M hydrochloric acid at 130°C for 48h followed by ID-LC–MS/MS. Then, HbA1c content in blood was quantified with the ratio of specific proteolytic peptides from HbA1c and HbA0 via enzyme digestion using ID-LC–MS/MS with the certified peptides as RMs and isotope-labeled peptides as internal standards. Results demonstrate complete traceability to SI-units throughout this procedure. Reliability was confirmed through comparative studies with commercially available RMs for HbA1c, and other routine HbA1c diagnostic methods as well. Following full method validation, we applied this procedure to the certification of candidate hemolysate-certified RMs for HbA1c content, as well as 52 real clinical samples. All of the results showed the suitability of this method to act as a primary reference measurement procedure for HbA1c in complex biological samples.

Publisher URL: www.sciencedirect.com/science

DOI: S0021967317310579

You might also like
Discover & Discuss Important Research

Keeping up-to-date with research can feel impossible, with papers being published faster than you'll ever be able to read them. That's where Researcher comes in: we're simplifying discovery and making important discussions happen. With over 19,000 sources, including peer-reviewed journals, preprints, blogs, universities, podcasts and Live events across 10 research areas, you'll never miss what's important to you. It's like social media, but better. Oh, and we should mention - it's free.

  • Download from Google Play
  • Download from App Store
  • Download from AppInChina

Researcher displays publicly available abstracts and doesn’t host any full article content. If the content is open access, we will direct clicks from the abstracts to the publisher website and display the PDF copy on our platform. Clicks to view the full text will be directed to the publisher website, where only users with subscriptions or access through their institution are able to view the full article.