If you care to argue my proof of the presence of dopamine in banana peel is in these published studies. There have been many more studies than just these done on banana peels as well giving back positive results for the presence of dopamine.

1). Chang-Peng Yang. Shuji Fujita, MD Ashrafuzzaman, Naoko Nakamura, and Nobuyki Hayaohi. J. Agric. Food Chem. 2000, 48, 2732-2735.

2). Kazuki Kanazawa and Hiroyuki Sakakibara. J. Agric. Food Chem. 2000, 48, 844-848.

3). M. Mar Sojo, Estrella Nunez-Delicado, Alvaro Sanchez-Ferrer, and Francisco Garcia-Carmona. J. Agric. Food Chem. 2000, 48, 5543-5547.