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. Author manuscript; available in PMC: 2016 May 18.
Published in final edited form as: Anal Bioanal Chem. 2007 May 23;388(8):1643–1651. doi: 10.1007/s00216-007-1301-4

Fig. 2.

Fig. 2

Extracted ion chromatograms for gliadinomorphin, β-casomorphin, deltorphin 2, and deltorphin 1, as obtained by direct injection of 20 µL of a standard solution (143 ng/mL) and HPLC–MS/MS analysis