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Tea infusions were characterised based on total flavonoids, total polyphenols and antioxidant activity, together with the determination of individual polyphenol content. Fourteen phenolic compounds, including phenolic acids, stilbenes and flavonoids, were selected based on their reported bioactivity and high accessibility, attributed to their low molecular weight. Both polyphenols and caffeine were initially monitored in raw tea infusions and through the different digestion stages (salivary, gastric and duodenal) by capillary high performance liquid chromatography coupled to diode array detection (cHPLC-DAD) and\/or HPLC coupled to a triple quadrupole mass analyser (HPLC\u2013MS\/MS). Multivariate analysis of the studied bioactives, using principal component analysis and cluster analysis, revealed that the decaffeination process seems to increase the stability and concentration of the compounds evaluated during digestion. The greatest transformations occurred mainly in the gastric and duodenal stages, where low bioactivity indices (IVBA) were shown for resveratrol and caffeic acid (IVBA\u2009=\u20090%). In contrast, the polyphenols gallic acid, chlorogenic acid and quercetin gave rise to their availability in white, green and oolong infusion teas (IVBA\u2009&gt;\u200990%). Furthermore, highly fermented black and pu-erh varieties could be designated as less bioaccessible environments in the duodenum with respect to the tested compounds.<\/jats:p>","DOI":"10.1007\/s00216-022-03922-x","type":"journal-article","created":{"date-parts":[[2022,2,2]],"date-time":"2022-02-02T18:02:27Z","timestamp":1643824947000},"page":"2739-2755","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":26,"title":["A combined analytical-chemometric approach for the in vitro determination of polyphenol bioaccessibility by simulated gastrointestinal digestion"],"prefix":"10.1007","volume":"414","author":[{"given":"Esther","family":"G\u00f3mez-Mej\u00eda","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Noelia","family":"Rosales-Conrado","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mar\u00eda Eugenia","family":"Le\u00f3n-Gonz\u00e1lez","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Alejandro","family":"Valverde","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yolanda","family":"Madrid","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2022,2,2]]},"reference":[{"key":"3922_CR1","doi-asserted-by":"publisher","first-page":"94","DOI":"10.1016\/j.jff.2017.02.037","volume":"33","author":"C Bergantin","year":"2017","unstructured":"Bergantin C, Maietti A, Cavazzini A, Pasti L, Tedeschi P, Brandolini V, Marchetti N. 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