{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,22]],"date-time":"2026-09-22T08:18:18Z","timestamp":1790065098115,"version":"4.0.1"},"reference-count":34,"publisher":"Elsevier BV","issue":"7","license":[{"start":{"date-parts":[[2009,3,1]],"date-time":"2009-03-01T00:00:00Z","timestamp":1235865600000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/www.elsevier.com\/tdm\/userlicense\/1.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Journal of Chromatography B"],"published-print":{"date-parts":[[2009,3]]},"DOI":"10.1016\/j.jchromb.2009.01.015","type":"journal-article","created":{"date-parts":[[2009,1,22]],"date-time":"2009-01-22T09:44:42Z","timestamp":1232617482000},"page":"603-609","source":"Crossref","is-referenced-by-count":98,"title":["Plasma tryptophan, kynurenine and 3-hydroxykynurenine measurement using automated on-line solid-phase extraction HPLC\u2013tandem mass spectrometry"],"prefix":"10.1016","volume":"877","author":[{"given":"Wilhelmina H.A.","family":"de Jong","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Reinier","family":"Smit","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Stephan J.L.","family":"Bakker","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Elisabeth G.E.","family":"de Vries","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ido P.","family":"Kema","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"78","reference":[{"key":"10.1016\/j.jchromb.2009.01.015_bib1","doi-asserted-by":"crossref","first-page":"242","DOI":"10.1016\/S1471-4906(03)00072-3","volume":"24","author":"Grohmann","year":"2003","journal-title":"Trends Immunol."},{"key":"10.1016\/j.jchromb.2009.01.015_bib2","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1017\/S1462399406000068","volume":"8","author":"Ruddick","year":"2006","journal-title":"Expert. Rev. Mol. Med."},{"key":"10.1016\/j.jchromb.2009.01.015_bib3","doi-asserted-by":"crossref","first-page":"827","DOI":"10.1007\/978-1-4615-4709-9_105","volume":"467","author":"Widner","year":"1999","journal-title":"Adv. Exp. Med. Biol."},{"key":"10.1016\/j.jchromb.2009.01.015_bib4","doi-asserted-by":"crossref","first-page":"399","DOI":"10.1192\/bjp.178.5.399","volume":"178","author":"Bell","year":"2001","journal-title":"Br. J. Psychiatry"},{"key":"10.1016\/j.jchromb.2009.01.015_bib5","doi-asserted-by":"crossref","first-page":"381","DOI":"10.1016\/S1570-0232(02)00572-X","volume":"780","author":"Amirkhani","year":"2002","journal-title":"J. Chromatogr. B Analyt. Technol. Biomed. Life Sci."},{"key":"10.1016\/j.jchromb.2009.01.015_bib6","doi-asserted-by":"crossref","first-page":"2166","DOI":"10.1373\/clinchem.2004.037465","volume":"50","author":"Maneglier","year":"2004","journal-title":"Clin. Chem."},{"key":"10.1016\/j.jchromb.2009.01.015_bib7","doi-asserted-by":"crossref","first-page":"69","DOI":"10.1016\/j.imlet.2007.06.001","volume":"111","author":"Zamanakou","year":"2007","journal-title":"Immunol. Lett."},{"key":"10.1016\/j.jchromb.2009.01.015_bib8","doi-asserted-by":"crossref","first-page":"185","DOI":"10.1016\/S0301-0082(00)00032-0","volume":"64","author":"Stone","year":"2001","journal-title":"Prog. Neurobiol."},{"key":"10.1016\/j.jchromb.2009.01.015_bib9","doi-asserted-by":"crossref","first-page":"33","DOI":"10.1016\/S0378-4347(00)00341-8","volume":"747","author":"Kema","year":"2000","journal-title":"J. Chromatogr. B Biomed. Sci. Appl."},{"key":"10.1016\/j.jchromb.2009.01.015_bib10","doi-asserted-by":"crossref","first-page":"82","DOI":"10.1016\/j.cca.2005.06.013","volume":"364","author":"Schrocksnadel","year":"2006","journal-title":"Clin. Chim. Acta"},{"key":"10.1016\/j.jchromb.2009.01.015_bib11","doi-asserted-by":"crossref","first-page":"579","DOI":"10.1093\/clinchem\/48.3.579","volume":"48","author":"Laich","year":"2002","journal-title":"Clin. Chem."},{"key":"10.1016\/j.jchromb.2009.01.015_bib12","doi-asserted-by":"crossref","first-page":"145","DOI":"10.1016\/S1570-0232(01)00639-0","volume":"769","author":"Vaarmann","year":"2002","journal-title":"J. Chromatogr. B Analyt. Technol. Biomed. Life Sci."},{"key":"10.1016\/j.jchromb.2009.01.015_bib13","doi-asserted-by":"crossref","first-page":"96","DOI":"10.1016\/S0304-3940(01)02242-X","volume":"313","author":"Erhardt","year":"2001","journal-title":"Neurosci. Lett."},{"key":"10.1016\/j.jchromb.2009.01.015_bib14","doi-asserted-by":"crossref","first-page":"61","DOI":"10.1016\/S0378-4347(00)00450-3","volume":"751","author":"Dazzi","year":"2001","journal-title":"J. Chromatogr. B Biomed. Sci. Appl."},{"key":"10.1016\/j.jchromb.2009.01.015_bib15","doi-asserted-by":"crossref","first-page":"157","DOI":"10.1016\/0378-4347(95)00341-X","volume":"675","author":"Herve","year":"1996","journal-title":"J. Chromatogr. B Biomed. Appl."},{"key":"10.1016\/j.jchromb.2009.01.015_bib16","doi-asserted-by":"crossref","first-page":"872","DOI":"10.1002\/bmc.445","volume":"18","author":"Vignau","year":"2004","journal-title":"Biomed. Chromatogr."},{"key":"10.1016\/j.jchromb.2009.01.015_bib17","doi-asserted-by":"crossref","first-page":"154","DOI":"10.1016\/j.chroma.2007.04.044","volume":"1159","author":"Arvidsson","year":"2007","journal-title":"J. Chromatogr. A"},{"key":"10.1016\/j.jchromb.2009.01.015_bib18","doi-asserted-by":"crossref","first-page":"57","DOI":"10.1016\/j.jchromb.2008.03.010","volume":"867","author":"Yamada","year":"2008","journal-title":"J. Chromatogr. B Analyt. Technol. Biomed. Life Sci."},{"key":"10.1016\/j.jchromb.2009.01.015_bib19","doi-asserted-by":"crossref","first-page":"59","DOI":"10.1016\/0021-9673(94)01287-O","volume":"703","author":"Gelpi","year":"1995","journal-title":"J. Chromatogr. A"},{"key":"10.1016\/j.jchromb.2009.01.015_bib20","doi-asserted-by":"crossref","first-page":"39","DOI":"10.1016\/j.leukres.2008.05.023","volume":"33","author":"Hoshi","year":"2009","journal-title":"Leuk. Res."},{"key":"10.1016\/j.jchromb.2009.01.015_bib21","doi-asserted-by":"crossref","first-page":"1291","DOI":"10.1111\/j.1365-2982.2008.01195.x","volume":"20","author":"Fitzgerald","year":"2008","journal-title":"Neurogastroenterol. Motil."},{"key":"10.1016\/j.jchromb.2009.01.015_bib22","doi-asserted-by":"crossref","first-page":"2266","DOI":"10.1016\/j.ejca.2008.05.023","volume":"44","author":"Feder-Mengus","year":"2008","journal-title":"Eur. J. Cancer"},{"key":"10.1016\/j.jchromb.2009.01.015_bib23","doi-asserted-by":"crossref","first-page":"2337","DOI":"10.1093\/clinchem\/39.11.2337","volume":"39","author":"Eynard","year":"1993","journal-title":"Clin. Chem."},{"key":"10.1016\/j.jchromb.2009.01.015_bib24","doi-asserted-by":"crossref","first-page":"863","DOI":"10.1021\/ac00101a012","volume":"67","author":"Naritsin","year":"1995","journal-title":"Anal. Chem."},{"key":"10.1016\/j.jchromb.2009.01.015_bib25","doi-asserted-by":"crossref","first-page":"286","DOI":"10.1373\/49.2.286","volume":"49","author":"Holm","year":"2003","journal-title":"Clin. Chem."},{"key":"10.1016\/j.jchromb.2009.01.015_bib26","doi-asserted-by":"crossref","first-page":"1684","DOI":"10.1373\/clinchem.2007.087114","volume":"53","author":"de Jong","year":"2007","journal-title":"Clin. Chem."},{"key":"10.1016\/j.jchromb.2009.01.015_bib27","doi-asserted-by":"crossref","first-page":"28","DOI":"10.1016\/j.jchromb.2008.04.009","volume":"868","author":"de Jong","year":"2008","journal-title":"J. Chromatogr. B Analyt. Technol. Biomed. Life Sci."},{"key":"10.1016\/j.jchromb.2009.01.015_bib28","unstructured":"R.B. Passey, D.E. Bee, A.Caffo, J.M. Erikson, NCCLS Document 6[18] (1986)."},{"key":"10.1016\/j.jchromb.2009.01.015_bib29","doi-asserted-by":"crossref","first-page":"1882","DOI":"10.1681\/ASN.V11101882","volume":"11","author":"Pinto-Sietsma","year":"2000","journal-title":"J. Am. Soc. Nephrol."},{"key":"10.1016\/j.jchromb.2009.01.015_bib30","doi-asserted-by":"crossref","first-page":"2525","DOI":"10.2337\/diacare.28.10.2525","volume":"28","author":"Brantsma","year":"2005","journal-title":"Diabetes Care"},{"key":"10.1016\/j.jchromb.2009.01.015_bib31","unstructured":"D.G. Rhoads Associates Inc., http:\/\/www.dgrhoads.com, accessed November 2008."},{"key":"10.1016\/j.jchromb.2009.01.015_bib32","unstructured":"CLSI, Approved Guideline-Second Edition, 20 (2000)."},{"key":"10.1016\/j.jchromb.2009.01.015_bib33","doi-asserted-by":"crossref","first-page":"858","DOI":"10.1093\/clinchem\/44.4.858","volume":"44","author":"Huengsberg","year":"1998","journal-title":"Clin. Chem."},{"key":"10.1016\/j.jchromb.2009.01.015_bib34","doi-asserted-by":"crossref","first-page":"1811","DOI":"10.1093\/clinchem\/47.10.1811","volume":"47","author":"Kema","year":"2001","journal-title":"Clin. Chem."}],"container-title":["Journal of Chromatography B"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/api.elsevier.com\/content\/article\/PII:S1570023209000385?httpAccept=text\/xml","content-type":"text\/xml","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/api.elsevier.com\/content\/article\/PII:S1570023209000385?httpAccept=text\/plain","content-type":"text\/plain","content-version":"vor","intended-application":"text-mining"}],"deposited":{"date-parts":[[2021,9,30]],"date-time":"2021-09-30T09:40:44Z","timestamp":1632994844000},"score":1,"resource":{"primary":{"URL":"https:\/\/linkinghub.elsevier.com\/retrieve\/pii\/S1570023209000385"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2009,3]]},"references-count":34,"journal-issue":{"issue":"7","published-print":{"date-parts":[[2009,3]]}},"alternative-id":["S1570023209000385"],"URL":"https:\/\/doi.org\/10.1016\/j.jchromb.2009.01.015","relation":{},"ISSN":["1570-0232"],"issn-type":[{"value":"1570-0232","type":"print"}],"subject":[],"published":{"date-parts":[[2009,3]]}}}