. Author manuscript; available in PMC: 2011 Feb 2.

Published in final edited form as: J Chromatogr B Analyt Technol Biomed Life Sci. 2008 Dec 24;877(3):285–290. doi: 10.1016/j.jchromb.2008.12.024

Table 5.

Stability of INH stock and plasma samples.

storage conditions	INH sample(ng/mL)	% remaining	% RSD
2 freeze/thaw cycles	Low (180) in plasma	95.1	1.2
2 freeze/thaw cycles	High (9000) in plasma	95.0	2.0
freezing for 27 days	Low (180) in plasma	97.1	0.6
freezing for 27 days	High (9000) in plasma	92.1	9.0
benchtop 1 hr	Low (180) in plasma	100.4	3.4
benchtop 1 hr	High (9000) in plasma	100	0.8
benchtop 3 hr	Low (180) in plasma	83.4	3.1
benchtop 3 hr	High (9000) in plasma	91.2	2.7
benchtop 20 hr	Low (180) in plasma	63.2	6.6
benchtop 20 hr	High (9000) in plasma	61.7	3.0
autosampler (72 hr)	Low (180) in extract	93.4	6.2
autosampler (72 hr)	High (9000) in extract	89.7	2.3
freezing for 6 months benchtop 20 hr	INH Stock solution	101	2.1
freezing for 6 months benchtop 20 hr	INH Stock solution	99.0	5.5