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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Bioavailability of catechins from guarana (Paullinia cupana) and its effect on antioxidant enzymes and other oxidative stress markers in healthy human subjects

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Yonekura, Lina ; Martins, Carolina Aguiar ; Sampaio, Geni Rodrigues ; Monteiro, Marcela Piedade ; Machado Cesar, Luiz Antonio ; Mioto, Bruno Mahler ; Mori, Clara Satsuki ; Nogueira Mendes, Thaise Maria ; Ribeiro, Marcelo Lima ; Arcari, Demetrius Paiva ; Ferraz da Silva Torres, Elizabeth Aparecida
Total Authors: 11
Document type: Journal article
Source: FOOD & FUNCTION; v. 7, n. 7, p. 2970-2978, 2016.
Web of Science Citations: 16

We assessed the effects of guarana (Paullinia cupana) consumption on plasma catechins, erythrocyte antioxidant enzyme activity (superoxide dismutase, catalase and glutathione peroxidase) and biomarkers of oxidative stress (ex vivo LDL oxidation, plasma total antioxidant status and ORAC, and lymphocyte single cell gel electrophoresis) in healthy overweight subjects. Twelve participants completed a 15-day run-in period followed by a 15-day intervention with a daily intake of 3 g guarana seed powder containing 90 mg (+)-catechin and 60 mg (-)-epicatechin. Blood samples were taken on the first and last day of the intervention period, fasting and 1 h post-dose. The administration of guarana increased plasma ORAC, while reducing ex vivo LDL oxidation (only in the first study day) and hydrogen peroxide-induced DNA damage in lymphocytes, at 1 h post-dose. Plasma catechin (0.38 +/- 0.12 and 0.44 +/- 0.18 nmol mL(-1)), epicatechin (0.59 +/- 0.18 and 0.64 +/- 0.25 nmol mL(-1)) and their methylated metabolites were observed at 1 h post-dose but were almost negligible after overnight fasting. The activities of catalase (in both study days) and glutathione peroxidase (in the last intervention day) increased at 1 h post-dose. Furthermore, the activity of both enzymes remained higher than the basal levels in overnight-fasting individuals on the last intervention day, suggesting a prolonged effect of guarana that continues even after plasma catechin clearance. In conclusion, guarana catechins are bioavailable and contribute to reduce the oxidative stress of clinically healthy individuals, by direct antioxidant action of the absorbed phytochemicals and up-regulation of antioxidant/detoxifying enzymes. (AU)

FAPESP's process: 09/08282-0 - Bioaccessibility, bioavailability and antioxidant activity of phenolic compounds from guaraná (Paullinia cupana)assessed in vitro and in vivo
Grantee:Lina Yonekura
Support type: Scholarships in Brazil - Young Researchers
FAPESP's process: 08/10308-4 - Bioaccessibility, bioavailability and antioxidant activity of phenolic compounds from Guaraná (Paullinia cupana) assessed in vitro and in vivo
Grantee:Lina Yonekura
Support type: Research Grants - Young Investigators Grants