Simultaneous Determination of Amphenicols and Metabolites in Animal-Derived Foods Using Ultrahigh-Performance Liquid Chromatography-Tandem Mass Spectrometry

Table 4

Recoveries of amphenicols and metabolites under various purification methods.

Purification method	Matrix	Number of amphenicols and metabolites
		Recovery <60%	Recovery 60% to 120%	Recovery >120%
HyperSep Retain PEP	Pork	1	1	2
	Beef	0	4	0
	Lamb	1	2	1
	Chicken	0	2	2
Oasis HLB SPE	Pork	2	0	2
	Beef	0	3	1
	Lamb	1	2	1
	Chicken	1	1	2
CNW Si SPE	Pork	0	4	0
	Beef	0	4	0
	Lamb	0	4	0
	Chicken	0	4	0