Methyl Esterification Combined with Gas Chromatography-Mass Spectrometry (GC-MS) for Determining the Contents of Lubricant to Evaluate the Compatibility of Chlorinated Butyl Rubber Stoppers with Liposome Injections

Table 2

Recoveries of methyl hexadecanoate and methyl stearate in liposome injections.

Analyte	No.	Spiked (mg)	Sample (mg)	Detected (mg)	Founded (mg)	Recovery (%)	Average recovery (%)	RSD (%)
Methyl hexadecanoate	1-1	5.5717	1.3377	7.0856	5.7478	103.16	95.25	7.16
	1-2	5.5551	1.3377	7.0581	5.7204	102.98
	1-3	5.5828	1.3377	7.1345	5.7967	103.83
	2-1	6.9647	1.3377	7.9494	6.6117	94.93
	2-2	6.9439	1.3377	7.8850	6.5473	94.29
	2-3	6.9785	1.3377	7.9809	6.6432	95.19
	3-1	8.3576	1.3377	8.6645	7.3268	87.67
	3-2	8.3326	1.3377	8.6407	7.3030	87.64
	3-3	8.3742	1.3377	8.6670	7.3293	87.52
Methyl stearate	1-1	6.3487	0.9936	7.4200	6.4263	101.22	100.29	1.07
	1-2	6.3867	0.9936	7.4009	6.4073	100.32
	1-3	6.3550	0.9936	7.4757	6.4821	102.00
	2-1	7.9358	0.9936	8.9891	7.9954	100.75
	2-2	7.9834	0.9936	8.9131	7.9195	99.20
	2-3	7.9438	0.9936	9.0308	8.0371	101.18
	3-1	9.5230	0.9936	10.4704	9.4768	99.51
	3-2	9.5800	0.9936	10.4637	9.4701	98.85
	3-3	9.5325	0.9936	10.4876	9.4940	99.60