The acid can be recrystallized from water. For further purification, the hydrochloride of 11-aminoundecanoic acid, which is available by acidification with hydrochloric acid, can be recrystallized from a methanol/ethyl acetate mixture.M.-H. Koh et al.: Divergent process for C10, C11, and C12 α-amino acid and α,ω-dicarboxylic acid monomers of polyamides from castor oil as a renewable resource. In: Bull. Korean Chem. Soc., 33 (6), 1873–1878 (2012), .
