I would like to analyse monocarboxylic acids higher than C20 (at least up to C30), but I cannot find a company for buying them. I prefer a mixture of more acids in an organic solvent but it can be solid standards. Thank you.
Matreya LLC (http://www.matreya.com) sell a lot of lipid standards. They have a C30 methylated fatty acid, but I'm not sure if they have the un-methylated version. You can always ask.