Table 2.

Parameters of dianthrones of 6 analytes and 1 internal standard in MRM analysis

No.	Compounds	Retention times (RT, min)	Precursor ion (m/z)	Product ion (m/z)	Fragmentor voltage (FV)	Collision energy (CE)	Ion mode
1	Polygonumnolide C4	6.99	670.7 [M−H]−	415.8	100	25	(−) ESI
2	Polygonumnolide C3	7.63	671.0 [M−H]−	415.8	100	25	(−) ESI
3	Polygonumnolide C1	11.80	670.9 [M−H]−	415.9	100	25	(−) ESI
4	Polygonumnolide C2	13.25	670.9 [M−H]−	416.0	100	25	(−) ESI
5	trans-Emodin dianthrones	16.51	508.8 [M−H]−	253.8	150	25	(−) ESI
6	cis-Emodin dianthrones	17.06	508.7 [M−H]−	253.9	150	25	(−) ESI
1S	Bianthronyl	17.37	384.9 [M−H]−	191.8	100	30	(−) ESI