For the detection and quantification of the listed polyphenols, a Waters Acquity UPLC system (Waters Corp., Milford, MA, USA) equipped with an autosampler chamber, two pumps and a degasser, was used. The chromatographic separation was performed on an ACQUITY UPLC BEH C18 (100 x 2.1 mm, particle size: 1.7 μm) column (Waters Corp., Milford, MA, USA), heated at 30°C and eluted as it was previously reported with some modification for polyphenolic compounds, intact GLs and ITCs respectively (Song et al., 2005 (link); Tian et al., 2005 (link); Zhu et al., 2020 (link)).
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