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Chromatographic profiles of aqueous extracts of Astragali radix before (A) and after (B) the addition of ammonia, as determined by HPLC–ELSD. [S1: astragaloside IV (AG IV); S2: astragaloside III (AG III) and formononetin; S3: astragaloside II (AG II); S4: isoastragaloside II (iAG II); S5: astragaloside I (AG I); S6: isoastragaloside I (iAG I); S7: acetylastragaloside I.]
