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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Miller, Adrian G. Brown, Heather Degg, Tim Allen, Keith Keevil, Brian G. |
| Description | Country affiliation: United kingdom Author Affiliation: Miller AG ( Department of Clinical Biochemistry, University Hospital of South Manchester, Southmoor Road, Wythenshawe, Manchester M23 9LT, UK. adrian.miller@nhs.net) |
| Abstract | In patients with carcinoid disease, urinary concentration of the serotonin metabolite 5-hydroxyindole acetic acid (5-HIAA) is currently used to monitor disease progression or response to treatment as it is the metabolic end-product resulting from free and stored serotonin turnover. However, due to the undignified, cumbersome and error-prone nature of 24-h urine collections, there is constant pressure to replace them. It has been demonstrated using high performance liquid chromatography (HPLC) with fluorescence detection technology that plasma can achieve this, with the added advantage that it can be used for diagnostic purposes also. Here we describe a much simpler method using liquid chromatography-tandem mass spectrometry (LC-MS/MS) that is twice as fast as a HPLC method currently in routine use. The sample preparation protocol requires 50 micorL of plasma and a simple protein precipitation step facilitated by acetonitrile. Chromatography was performed on a Phenomenex C18 Security Guard column coupled to a SIELC Primesep B reversed-phase, anion-exchange dual chemistry column and methanolic mobile phase gradient elution. Eluant was directly connected to a Waters Quattro Premier XE tandem mass spectrometer operating in positive ion mode. We detected multiple reaction monitoring transitions m/z 191.9>145.6 and 193.9>147.6 for 5-HIAA and d2-5-HIAA respectively, which co-eluted at 2.1 min. Ion suppression was negligible, recovery from spiked plasma was 103% (range 97-113%) and the method showed good linearity to 10,000 nmol/L (r(2)=0.999). Within-batch and between-batch imprecision was <10% and bias <15% at 3 concentrations, the limit of detection was 5 nmol/L and lower limit of quantitation 15 nmol/L. No interference was observed with l-tryptophan or 5-hydroxytryptamine. Comparison of LC-MS/MS and HPLC showed good agreement between the two methods but this LC-MS/MS assay displays several advantages; it requires 10-fold less sample, has a simpler extraction procedure and extended linearity, thus increasing laboratory throughput, lowering reagent costs and removing the need to dilute samples in patients with established carcinoid disease being monitored for therapeutic efficacy. |
| File Format | HTM / HTML |
| ISSN | 15700232 |
| Issue Number | 7-8 |
| Volume Number | 878 |
| e-ISSN | 1873376X |
| Journal | Journal of Chromatography B |
| Language | English |
| Publisher | Elsevier |
| Publisher Date | 2010-03-01 |
| Publisher Place | Netherlands |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Discipline Analytical Chemistry Chromatography, High Pressure Liquid Methods Chromatography, Liquid Hydroxyindoleacetic Acid Blood Tandem Mass Spectrometry Carcinoid Tumor Humans Linear Models Reproducibility Of Results Sensitivity And Specificity Comparative Study Journal Article |
| Content Type | Text |
| Resource Type | Article |
| Subject | Cell Biology Medicine Analytical Chemistry Clinical Biochemistry Biochemistry |
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