1. Purple discoloration of the colon found during autopsy: Identification of betanin, its aglycone and metabolites by liquid chromatography–high-resolution mass spectrometry 
Andreas T. Roemmelt, Sabine Franckenberg, Andrea E. Steuer, Thomas Kraemer 
Forensic Science International 
Volume 240, Pages e1-e6 (July 2014)
DOI: /j.forsciint
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2. Fig. 1
Chemical structures of important betalains: betanin (a), isobetanin (b), betanidin (c), isobetanidin (d), vulgaxanthin I (e) and vulgaxanthin II (f).
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3. Fig. 2
Different autopsy findings of the colon of the presented case (a, b) and normal findings (c). (a) Outer membrane of the colored colon (red circle); (b) inner membrane of the colored colon (green circle); (c) outer (red circle) and inner (green circle) membrane (not colored).
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4. Fig. 3
LC HRMS results of colon extract. (a) Total ion chromatogram; (b) TOF MS at peak 1; (c) extracted ions of m/z 551±0.01Da (1 and 2) and m/z 389±0.01Da (3).
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5. Fig. 4
Fragment ion spectra of different betanidins. (a) MS/MS spectrum of betanidin; (b) MS/MS spectrum of betanin; (c) MS/MS spectrum of betanidin glucuronide; (d) MS/MS spectrum of betanidin sulfate.
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6. Fig. 5
Postulated fragmentation pathways of betanidin-rest (after loss of the respective glucose, glucuronic acid or sulfate moieties, respectively).
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