Fig. 3From: Quality control of Lycium chinense and Lycium barbarum cortex (Digupi) by HPLC using kukoamines as markersInfluence of methanol concentration (a), acetic acid concentration (b), and number of extraction rounds (c) on the extraction efficiency of kukoamines in LyC. The experiments for each condition were performed in triplicate (n = 3) and the results are presented as the mean ± standard deviationBack to article page