molecules Article Comparative Metabolic Profiling of Green and Purple Pakchoi (Brassica Rapa Subsp. Chinensis) Jin Jeon 1 ID , Chan Ju Lim 2, Jae Kwang Kim 3 ID and Sang Un Park 1,* 1 Department of Crop Science, Chungnam National University, 99, Daehak-Ro, Yuseong-gu, Daejeon 34134, ...