Detection of the Content of Two Coumarins, IM and ISOIM, and Their Mechanism of Action on Colitis Rats in Angelica albicans

Table 4

Extraction recovery, matrix impacts, and stability of IM and ISOIM in rat plasma.

Constituents	Conc. nominal (ng/mL)	Recovery rate in %	Matrix (%)	Durability (%)
				Free-thaw cycles	At -70 °C for 30 days	At room for 24 hrs
IM	2	84.9	91	97	99	97
	50	83.4	92	100	101	100
	150	79.8	85	101	94	101
ISOIM	2	85.3	94	101	98	95
	50	75.6	96	98	98	100
	150	70.3	94	95	97	97