. Author manuscript; available in PMC: 2017 Aug 23.

Published in final edited form as: J Chromatogr B Analyt Technol Biomed Life Sci. 2016 Dec 13;1044-1045:200–205. doi: 10.1016/j.jchromb.2016.12.019

Table 2.

Comparison of all QCs evaluated (characterization and evaluation) over a 7-month period for free menthol and total menthol analysis

Sample		N	Average (μg/mL)	Standard Deviation	%RSD
Free menthol	QC Low	22	0.037	0.005	14.2%
Free menthol	QC High	23	0.297	0.043	14.4%
Total menthol	QC Low	32	1.44	0.08	5.5%
Total menthol	QC High	32	8.81	0.67	7.6%

RSD = relative standard deviation