Seddik, Hassan, and Rana Kazan. 2014. “Determination of Alanine, Arginine, and Tyrosine in Black, Oolong, Green and White Tea by Derivation With Ortho-Phthalaldehyde Using HPLC-FLD”. Tishreen University Journal -Basic Sciences Series 36 (3). https://journal.tishreen.edu.sy/index.php/bassnc/article/view/892.