title: N-acetyl-L-aspartic acid, N-acetyl-alpha-L-aspartyl-L-glutamic acid and beta-citryl-L-glutamic acid in human urine.
abstract: N-Acetyl-L-aspartic acid (NA-Asp), N-acetyl-alpha-L-aspartyl-L-glutamic acid (NA-Asp-Glu) and beta-citryl-L-glutamic acid (beta-CG), which are known to occur in the brain, have been isolated from human urine. Their identities were proved by comparing them with synthetic NA-Asp, NA-Asp-Glu and beta-CG using electrophoretic and chromatographic methods and by acid hydrolysis. A method was developed for the quantitation of NA-Asp, NA-Asp-Glu and beta-CG in human urine. It consists of ion-exchange chromatography followed by gas-chromatographic analysis. The amounts of urinary excretion of NA-Asp, NA-Asp-Glu and beta-CG were 41.2 +/- 10.1 (n = 27), 20.8 +/- 9.6 (n = 27) and 30.2 +/- 13.2 (n = 21) mumol/g creatinine in adult males, and 62.2 +/- 16.3 (n = 27), 24.0 +/- 8.2 (n = 27) and 40.5 +/- 21.1 (n = 24) mumol/g creatinine in adult females, respectively.
mesh_terms: D000328:Adult; D000368:Aged; D001224:Aspartic Acid / Q000031:analogs & derivatives* / Q000652:urine; D002849:Chromatography, Gas; D004151:Dipeptides / Q000652:urine*; D004590:Electrophoresis, Paper; D005260:Female; D005971:Glutamates / Q000652:urine*; D006801:Humans; D008297:Male; D008875:Middle Aged; D012016:Reference Values
chemical_list: D004151:Dipeptides; D005971:Glutamates; C027172:isospaglumic acid; D001224:Aspartic Acid; C018491:beta-citrylglutamic acid; C000179:N-acetylaspartate