Optimization of brewing conditions for Tieguanyin oolong tea by quadratic orthogonal regression design

ARTICLE OPEN Optimization of brewing conditions for Tieguanyin oolong tea by quadratic orthogonal regression design Qing-Qing Cao 1,2 , Jie-Qiong Wang1,2 , Jian-Xin Chen1 , Fang Wang 1 , Ying Gao 1 ✉, Daniel Granato 3 , Xuebo Zhang4 , Jun-Feng Yin1 and Yong-Quan Xu 1 ✉ Tieguanyin is one of the most consumed oolong teas because of its distinctive flavor. The brewing process is crucial for the flavor performance of traditional teas, thus the effects of brewing conditions, including water/tea...