1. Cejudo-Bastante MJ, Chaalal M, Louaileche H, Parrado J, Heredia FJ: Betalain profile, phenolic content, and color characterization of different parts and varieties of Opuntia ficus-indica. J Agric Food Chem. 2014 Aug 20;62(33):8491-9. doi: 10.1021/jf502465g. Epub 2014 Aug 7. [PubMed:25075631]