Epicatechin fragment ions

Figure 4 Product ion spectra of epicatechin-O-glucuronide (top) and quercetin-0-glucuronide. Whereas the spectrum for quercetin-O-glucuronide only shows the neutral loss of glucuronic acid (m/z 303), the spectrum for epicatechin-O-glucuronide shows—apart from the loss of water and other small molecules— several characteristic fragments like [ A -i-glucuronic acid]" (m/z 315).

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