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Chemical structures of the saponins identified in switchgrass. (A) Seven purified saponins, representing the seven switchgrass saponin classes, have distinct RTs between 5 and 11 min. (B–H) Structures and numbering of the aglycones for the saponins SS1031, SS1032, SS1244, SS1064, SS1050, SS1254, and SS1089. Classifications of the saponins are shown in the parentheses. R and R′ indicate the position of the sugar moiety at C-3 and C-26 (on the side chain), respectively.
