Abstract
The qualitative and quantitative polyphenolic content of the infusions of the commercial peppermint tea (Mentha × piperita L.) samples (n = 27) from different countries was studied using HPLC-UV-MS/MS analysis. Overall, 22 polyphenols were identified in the peppermint infusions. The major polyphenols were eriocitrin, 12-hydroxyjasmonate sulphate, luteolin-O-rutinoside and rosmarinic acid. The total polyphenolic content varied largely among the 27 peppermint tea infusions, found in a range of 10.0 – 218.0 mg/ml. In order to determine the content of samples by finding chemosystematic markers, essential oil composition of the samples was determined by GC. Of the analysed peppermint tea samples, 24 met the standards set by Ph. Eur. 7th Ed., whereas the analyses indicated that three samples may contain Mentha spicata, a species different from that claimed on the package.
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