In the article entitled "Analysis of Carnitine BiosynthesisMetabolites in Urine by HPLCElectrospray Tandem MassSpectrometry" by F.M. Vaz, B. Melegh, J. Bene, D. Cuebas, D.A.Gage, A. Bootsma, P. Vreken, A.H. van Gennip, L.L. Bieber, andR.J.A. Wanders
(Clin Chem 2002;48:82634)
, the concentrationof heptafluorobutyric acid in eluant A of the mobile phase forthe HPLCtandem mass spectrometry, listed in the fifthline from the bottom of the second column on page 828, is incorrect.The concentration should read 1 mL/L, not 11 mL/L. The erroroccurred in production.