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We used liquid chromatography-high resolution mass spectrometry (LC-MS) to show that oxidised and non-oxidised Met residues at position 147 of human serum albumin (Met<jats:sup>147<\/jats:sup>) can be accurately and reproducibly quantified with stable isotope-labelled peptides. Met<jats:sup>147<\/jats:sup> oxidation was significantly higher in patients with diabetes than in controls. Least square multivariate analysis revealed that glycated haemoglobin (HbA<jats:sub>1c<\/jats:sub>) and glycated albumin (GA) did not significantly influence Met<jats:sup>147<\/jats:sup> oxidation, but the GA\/HbA<jats:sub>1c<\/jats:sub> ratio, which reflects glycaemic excursions, independently affected Met<jats:sup>147<\/jats:sup> oxidation status. Continuous glucose monitoring revealed that Met<jats:sup>147<\/jats:sup> oxidation strongly correlates with the standard deviation of sensor glucose concentrations and the time spent with hypoglycaemia or hyperglycaemia each day. Thus, glycaemic variability and hypoglycaemia in diabetes may be associated with greater oxidation of Met<jats:sup>147<\/jats:sup>. Renal function, high-density lipoprotein-cholesterol and serum bilirubin were also associated with the oxidation status of Met<jats:sup>147<\/jats:sup>. In conclusion, the quantification of oxidised and non-oxidised Met<jats:sup>147<\/jats:sup> in serum albumin using our LC-MS methodology could be used to assess the degree of intravascular oxidative stress induced by hypoglycaemia and glycaemic fluctuations in diabetes.<\/jats:p>","DOI":"10.1038\/s41598-019-57095-2","type":"journal-article","created":{"date-parts":[[2020,1,14]],"date-time":"2020-01-14T11:03:30Z","timestamp":1578999810000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":23,"title":["Oxidised Met147 of human serum albumin is a biomarker of oxidative stress, reflecting glycaemic fluctuations and hypoglycaemia in diabetes"],"prefix":"10.1038","volume":"10","author":[{"given":"Akari","family":"Momozono","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yoshio","family":"Kodera","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Sayaka","family":"Sasaki","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yuzuru","family":"Nakagawa","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ryo","family":"Konno","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5704-1378","authenticated-orcid":false,"given":"Masayoshi","family":"Shichiri","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2020,1,14]]},"reference":[{"key":"57095_CR1","doi-asserted-by":"publisher","first-page":"453","DOI":"10.1038\/nrd3403","volume":"10","author":"GR Drummond","year":"2011","unstructured":"Drummond, G. 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