Notes: An internal standard for the quantification of lauroyl-L-carnitine (Item No. 26550) by GC- or LC-MS. Lauroyl-L-carnitine is an acylcarnitine and a quaternary ammonium-containing cationic surfactant.{43575} It has been used to permeabilize porcine enterocytes for delivery of the polar fluorescent probe lucifer yellow (Item No. 25573).