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. Author manuscript; available in PMC: 2013 Jul 15.
Published in final edited form as: Anal Chem. 2012 Oct 10;84(21):9259–9267. doi: 10.1021/ac302039u

Figure 4.

Figure 4

Imaging mass spectrometry to explore microbial bile acid transformations. A series of panels are provided for two colonies of Bt and two colonies of Bl on TYG agar, TYG agar + taurocholate (9), and TYG agar + deoxytaurocholate (7). The panels represent the portion of the Petri dish agar relocated to a MALDI target plate. Each false-colored image represents the normalized signal intensity for the m/z value illustrated. Identities of m/z values were assigned by nanoDESI MS/MS and LC-MS (Figures 2 and S1–4). For compounds (7–9) present in Figures 1–3, identical color coding is utilized.