Urine samples were diluted to a creatinine content of 0.1 mmol/L, followed by the addition of 0.01 nmol [2H9]pipecolic acid as internal standard (IS) and 5 μL was injected onto a Waters C18 T3 HPLC column. Chromatography was performed using water/methanol 97/3 (v/v) including 0.03...
Edelstein, David