MS/MS fragments Catechin Quercetin Myricetin [M-H]- 289 301 317 Loss of B ring (Catechol) 108.5     1,2B-   178.2 178.2 1,2B- - CO   150.3   Loss of trihydroxy benzene methane from [M-H]-     136.5 Loss of Catechol methyl from [M-H]-   120.6

Table 3: MS/MS fragments of polyphenols in biomarker mixture