Octanoic Acid-13C is intended for use as an internal standard for the quantification of octanoic acid by GC- or LC-MS. Octanoic acid is a medium-chain saturated fatty acid. It has been found in Teleme cheeses made from goat,ovine,or bovine milk.1 Octanoic acid is active against the bacteria S. mutans,S. gordonii,F. nucleatum,and P. gingivalis (IC80s = <125,<125,1,403,and 2,294 μM,respectively).2 Levels of octanoic acid are increased in the plasma of patients with medium-chain acyl-CoA dehydrogenase (MCAD)deficiency,an inborn error of fatty acid metabolism characterized by hypoketotic hypoglycemia,medium-chain dicarboxylic aciduria,and intolerance to fasting.3,4
Nitisinone-13C6 isinone-13C6 is intended for use as an internal standard for the quantification of nitisinone by GC- or LC-MS. Nitisinone (T1684) is an inhibitor of 4-hydroxyphenylpyruvate dioxygenase (HPPD),which converts 4-hydroxyphenylpyruvate (HPPA)to homogentisate in the tyrosine catabolic pathway.1Nitisinone increases urinary levels of HPPA and 4-hydroxyphenyllactate (HPLA)in rats when administered at a dose of 10 mg/kg. Nitisinone (T1684) (3 mg/kg)prevents the neonatal lethality of fumarylacetoacetate hydrolase (FAH)deficiency in mice when administered to pregnant dams.2It exhibits hepatoprotective effects inFAH-/-mice,such as prevention of increases in plasma levels of aspartate serine aminotransferase (AST)and conjugated bilirubin,when administration is continued following birth at a dose of 1 mg/kg. Nitisinone (T1684) (100 μg)decreases urinary excretion of homogentisate and increases urinary excretion of HPPA,HPLA,and 4-hydroxyphenylacetate in a mouse model of alkaptonuria induced by ethylnitrosourea.3Formulations containing nitisinone have been used in the treatment of hereditary tyrosinemia type 1 (HT-1).
L-Glyceric acid sodium is a urinary metabolite predominantly found in individuals with the rare inherited metabolic disorder, L-glyceric aciduria. This compound serves as a diagnostic tool for identifying primary hyperoxaluria type 2 (PH2) and can be used to differentiate between PH1 and PH2 based on its excretion pattern.