Untargeted qualitative and targeted quantitative analysis of saponins reveal differential chemotypes of Gynostemma pentaphyllum and G. longipes from different geographical origins. - Liang HZ; Wang MY; Yang G; Li G; Zhang J; Yao L; Nan Y; Huang CL; Chen XJ; Song J; Cao F; Guo BL; et al. (Food chemistry, 2025)