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LC-ESIMS analysis of gallic acid and quercetin standards in methanol/water solution (70 : 30, v/v) with 1 mM ammonium formate. (a) Chromatogram of gallic acid standard. (b) Chromatogram of quercetin standard. (c) Mass spectra extracted in t R = 23.5 min of chromatogram of gallic acid standard. (d) Mass spectra extracted in t R = 3.7 min of chromatogram of quercetin standard.
