Notes: Long-chain Saturated Fatty Acid Methyl Ester Mixture 4 contains five long-chain saturated fatty acid methyl esters. It is intended for use as a reference standard for the detection of long-chain saturated fatty acids in various samples by GC-MS. This mixture is supplied in an amber ampule in which the headspace has been purged with nitrogen/argon to prevent lipid oxidation. [Matreya, LLC. Catalog No. 1104]