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. 2013 Feb 12;4(4):566–574. doi: 10.1021/cn3002009

Figure 4.

Figure 4

Capillary electrophoresis mass spectrometry quantification of methylphenidate in a fly head corresponding to various oral methylphenidate administration at 0, 5, 10, and 15 mM. Error bars are mean ± SEM of n = 9–12 samples for each level of administration and ranged from 5 to 29 μM. The analyses were carried out using 30 fly heads by CE-MS. Separation was performed in citric acid buffer (50 mM) at voltage 20 kV, positive mode. MS conditions: ESI voltage 4500 V, positive mode, sheath liquid isopropanol/water (70:30, v/v) with flow rate 3 μL mL–1.