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. Author manuscript; available in PMC: 2014 Oct 24.
Published in final edited form as: Pharm Res. 2010 Feb 17;27(4):619–627. doi: 10.1007/s11095-009-0037-6

Fig. 2.

Fig. 2

Negative ion LC-MS studies of hydrolysis products formed from B2-G2. A) Total ion current chromatogram of products from the partial enzymatic hydrolysis of B2-G2. Peaks 1, 2 and 5 correspond to gallic acid, B2 and B2G2, respectively, by comparison with authentic standards. B) MS spectrum of peak 3 and C) MS spectrum of peak 4, both demonstrating a deprotonated molecular ion (M – H)− at 729 Da. D) MS/MS spectrum of the 729 ion from peak 3. E) MS/MS spectrum of the 729 ion from peak 4. The unique ion at 441 Da corresponds to interflavin bond cleavage and charge retention the lower unit as shown.