Contents Variation Analysis of γ-amino Butyric Acid in Sojae Semen Praeparatum Fermentation Using Online Pre-column Derivatization-HPLC. 2021,Meizhi Weng#, Jing He#, Jiaxiua Ren, Yonghong Liang, Qingfeng Chen, Mingsheng Su, Liyuan Wang, Xiaomei Xie*. Wuhan University Journal of Natural Sciences.