BACKGROUND: Glutaric aciduria type I (GA1) is an autosomal recessive disorder that usually causes neurological damage. Early diagnosis of the disease prior to the appearance of clinical symptoms can lead to better outcomes. METHODS: We describe a simple and selective HPLC method with intramolecular excimer-forming fluorescence derivatization to diagnose GA1. Glutaric acid (GA) and 3-hydroxyglutaric acid (3HGA) in urine and an internal standard were derivatized with 1-pyrenebutyric hydrazide (PBH). The derivatives were separated on a C18 column and fluorometrically detected at 475 nm (excitation of 345 nm) with a run time of 18 min. RESULTS: Excellent linearity over a wide range, reproducibility (coefficient of variation < or =14.5%), and sensitivity (limit of detection 0.4 micromol/l 3HGA and 0.2 micromol/l GA) were obtained. A retrospective study on previously diagnosed GA1 patients' urine from our laboratory archives between 1999 and 2004 was performed by analysts blinded to the study. CONCLUSIONS: The method enabled us to differentiate GA1 cases (n=36) from controls (n=99), regardless of the years of urine storage. The method is valuable for both retrospective and prospective diagnoses of GA1.
BACKGROUND:Glutaric aciduria type I (GA1) is an autosomal recessive disorder that usually causes neurological damage. Early diagnosis of the disease prior to the appearance of clinical symptoms can lead to better outcomes. METHODS: We describe a simple and selective HPLC method with intramolecular excimer-forming fluorescence derivatization to diagnose GA1. Glutaric acid (GA) and 3-hydroxyglutaric acid (3HGA) in urine and an internal standard were derivatized with 1-pyrenebutyric hydrazide (PBH). The derivatives were separated on a C18 column and fluorometrically detected at 475 nm (excitation of 345 nm) with a run time of 18 min. RESULTS: Excellent linearity over a wide range, reproducibility (coefficient of variation < or =14.5%), and sensitivity (limit of detection 0.4 micromol/l 3HGA and 0.2 micromol/l GA) were obtained. A retrospective study on previously diagnosed GA1patients' urine from our laboratory archives between 1999 and 2004 was performed by analysts blinded to the study. CONCLUSIONS: The method enabled us to differentiate GA1 cases (n=36) from controls (n=99), regardless of the years of urine storage. The method is valuable for both retrospective and prospective diagnoses of GA1.
Authors: Osama Y Al-Dirbashi; Stefan Kölker; Dione Ng; Lawrence Fisher; Tony Rupar; Nathalie Lepage; Mohamed S Rashed; Tomofumi Santa; Stephen I Goodman; Michael T Geraghty; Johannes Zschocke; Ernst Christensen; Georg F Hoffmann; Pranesh Chakraborty Journal: J Inherit Metab Dis Date: 2010-10-27 Impact factor: 4.982
Authors: Molly M Warnke; Zachary S Breitbach; Edra Dodbiba; Eranda Wanigasekara; Xiaotong Zhang; Pritesh Sharma; Daniel W Armstrong Journal: J Am Soc Mass Spectrom Date: 2008-11-27 Impact factor: 3.109
Authors: Nikolas Boy; Chris Mühlhausen; Esther M Maier; Jana Heringer; Birgit Assmann; Peter Burgard; Marjorie Dixon; Sandra Fleissner; Cheryl R Greenberg; Inga Harting; Georg F Hoffmann; Daniela Karall; David M Koeller; Michael B Krawinkel; Jürgen G Okun; Thomas Opladen; Roland Posset; Katja Sahm; Johannes Zschocke; Stefan Kölker Journal: J Inherit Metab Dis Date: 2016-11-16 Impact factor: 4.982
Authors: Stefan Kölker; Ernst Christensen; James V Leonard; Cheryl R Greenberg; Avihu Boneh; Alberto B Burlina; Alessandro P Burlina; Marjorie Dixon; Marinus Duran; Angels García Cazorla; Stephen I Goodman; David M Koeller; Mårten Kyllerman; Chris Mühlhausen; Edith Müller; Jürgen G Okun; Bridget Wilcken; Georg F Hoffmann; Peter Burgard Journal: J Inherit Metab Dis Date: 2011-03-23 Impact factor: 4.982