Notes: Long-chain Cis/Trans Isomer Fatty Acid Methyl Ester Mixture contains 16 saturated and mono- and polyunsaturated long-chain fatty acid methyl esters, including ten cis/trans C18:1 isomers. It is intended for use as a reference standard for the detection of long-chain fatty acids in various sample types by GC-MS. [Matreya, LLC Catalog No. 1131]