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. Author manuscript; available in PMC: 2009 Dec 9.
Published in final edited form as: J Pharm Biomed Anal. 2007 Jan 12;43(5):1789–1795. doi: 10.1016/j.jpba.2006.12.034

Fig. 4.

Fig. 4.

Chromatograms from aCSF spiked with MTX and 7‐OH MTX at 10 ng/ml with column switching monitored at the transitions of 455.4→308.0 and 471.0→324.2, respectively. Aminopterin, internal standard is monitored at a transition of 441.1→294.3.