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. Author manuscript; available in PMC: 2014 Jul 26.
Published in final edited form as: J Chromatogr A. 2013 Apr 18;1300:217–226. doi: 10.1016/j.chroma.2013.04.030

Fig. 7.

Fig. 7

The recovery of ISTDs in fractions using the MTBE-SPE method. Extraction was performed and resulting samples were separated using RPC and analyzed using LCMS in positive mode as described in the text.