This study evaluated the bioaccessibility and antioxidant capacity of the ethanolic extracts of Tagetes patula (ETP) and Zingiber officinale (EZO) during simulated in vitro gastrointestinal digestion. The phenolic content and antioxidant capacity were analyzed using the DPPH and FRAP methods at the oral, gastric, and intestinal stages. Simulated digestion led to a reduction in phenolic and flavonoid levels in both extracts. The T. patula extract retained 64.05 ± 4.63 mg GAE/g DE of phenolic compounds and 49.18 ± 7.97 mg RE/g DE of flavonoids in the UF. In contrast, Z. officinale exhibited higher susceptibility, with phenolic content decreasing from 130.13 ± 4.69 to 16.96 ± 0.14 mg GAE/g DE and flavonoid content from 64.97 ± 5.75 to 0.32 ± 0.09 mg RE/g DE. Nevertheless, during the final stage of digestion, an increase in DPPH radical scavenging capacity was observed compared to previous stages, reaching 23.29 ± 0.42 mg TE/g DE. Notably, high-performance liquid chromatography (HPLC) analysis revealed that T. patula maintained its free phenolic compounds throughout digestion, while Z. officinale showed enhanced release of these compounds.
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