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
Ethynyl estradiol 3-β-D-glucuronide is a metabolite of ethynyl estradiol that can be detected in urine.1,2It is used as a marker of estrogen contamination in fresh and saltwater.2
1.Hadd, H.E., Slikker, W., Jr., and Helton, E.D.The synthesis and characterization of the glucopyranosiduronic acids of 17a-ethynylestradiol-17bJ. Steroid Biochem.13(9)1107-1114(1980) 2.Griffith, D.R., Soule, M.C.K., Eglinton, T.I., et al.Steroidal estrogen sources in a sewage-impacted coastal oceanEnviron. Sci.: Processes Impacts18(8)931-1106(2016)