Optimization of ultrasound-assisted extraction of quercetin, luteolin, apigenin, pinocembrin and chrysin from Flos populi by Plackett-Burman design combined with Taguchi method

- Wang, Biying; Goldsmith, Chloe Desiree; Zhao, Jiahong; Zhao, Shanshan; Sheng, Zunlai; Yu, Wenhui