{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2024,4,11]],"date-time":"2024-04-11T02:12:44Z","timestamp":1712801564273},"reference-count":11,"publisher":"Walter de Gruyter GmbH","issue":"3","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2000,3,25]]},"abstract":"<jats:title>Abstract<\/jats:title>\n               <jats:p>We studied the accuracy and precision of a HPLC method for determination of porphyrins in urine. A commercial standard solution appeared to contain less porphyrins than indicated by the manufacturer, since calibration resulted in lower concentrations of uroporphyrin and coproporphyrin: 16% and 8%, respectively. Coefficients of variation for the measurement of uro-, hepta-, copro I and copro III porphyrins in samples of patients with and without porphyria were often much less than 15%. Comparison of measurements with and without calibrated standards revealed differences for uroporphyrin and coproporphyrin of 27% and 5%, respectively. Recovery of added uroporphyrin and coproporphyrin was 99%. The main cause of the variability in test results was apparently the improperly calibrated standard solutions. The precision of porphyrin measurements was not influenced by the type of porphyria.<\/jats:p>","DOI":"10.1515\/cclm.2000.033","type":"journal-article","created":{"date-parts":[[2004,10,13]],"date-time":"2004-10-13T10:25:56Z","timestamp":1097663156000},"page":"227-230","source":"Crossref","is-referenced-by-count":6,"title":["On Accuracy and Precision of a HPLC Method for Measurement of Urine Porphyrin Concentrations"],"prefix":"10.1515","volume":"38","author":[{"given":"Floris M.J.","family":"Zuijderhoudt","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Stephan G.A.","family":"Koehorst","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Willem E.","family":"Kluitenberg","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jenneke Dorresteijn-de","family":"Bok","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"374","published-online":{"date-parts":[[2005,6,1]]},"reference":[{"key":"p_1","doi-asserted-by":"crossref","first-page":"395","DOI":"10.1177\/000456329002700501","volume":"27","author":"Elder GH","year":"1990","journal-title":"Ann Clin Biochem"},{"key":"p_2","doi-asserted-by":"publisher","DOI":"10.1016\/0009-8981(84)90192-X"},{"key":"p_3","doi-asserted-by":"crossref","first-page":"103","DOI":"10.1093\/clinchem\/34.1.103","volume":"34","author":"Johnson PM","year":"1988","journal-title":"Clin Chem"},{"key":"p_4","doi-asserted-by":"publisher","DOI":"10.1016\/0009-8981(77)90024-9"},{"key":"p_5","doi-asserted-by":"crossref","first-page":"2164","DOI":"10.1093\/clinchem\/33.12.2164","volume":"33","author":"Beukeveld GJJ","year":"1987","journal-title":"Clin Chem"},{"key":"p_6","first-page":"203","volume":"11","author":"Beukeveld GJJ","year":"1987","journal-title":"Biochim Clin"},{"key":"p_7","doi-asserted-by":"crossref","first-page":"553","DOI":"10.1177\/000456329703400512","volume":"34","author":"Allen KR","year":"1997","journal-title":"Ann Clin Biochem"},{"key":"p_8","doi-asserted-by":"crossref","first-page":"1196","DOI":"10.1093\/clinchem\/37.7.1196","volume":"37","author":"Steigstra H","year":"1997","journal-title":"Clin Chem"},{"key":"p_9","first-page":"185","author":"Committee","year":"1972","journal-title":"Washington, DC: National Academy of Sciences"},{"key":"p_10","doi-asserted-by":"crossref","first-page":"186","DOI":"10.1177\/000456329503200209","volume":"32","author":"Zuijderhoudt FMJ","year":"1995","journal-title":"Ann Clin Biochem"},{"key":"p_11","doi-asserted-by":"crossref","first-page":"527","DOI":"10.1093\/clinchem\/29.3.527","volume":"29","author":"Schreiber WE","year":"1983","journal-title":"Clin Chem"}],"container-title":["cclm"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.degruyter.com\/document\/doi\/10.1515\/CCLM.2000.033\/xml","content-type":"application\/xml","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/www.degruyter.com\/document\/doi\/10.1515\/CCLM.2000.033\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2022,3,14]],"date-time":"2022-03-14T14:58:13Z","timestamp":1647269893000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.degruyter.com\/document\/doi\/10.1515\/CCLM.2000.033\/html"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2000,3,25]]},"references-count":11,"journal-issue":{"issue":"3","published-online":{"date-parts":[[2005,6,1]]},"published-print":{"date-parts":[[2000,3,25]]}},"alternative-id":["10.1515\/CCLM.2000.033"],"URL":"https:\/\/doi.org\/10.1515\/cclm.2000.033","relation":{},"ISSN":["1434-6621"],"issn-type":[{"value":"1434-6621","type":"print"}],"subject":[],"published":{"date-parts":[[2000,3,25]]}}}