{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,5]],"date-time":"2025-10-05T12:18:18Z","timestamp":1759666698121},"reference-count":62,"publisher":"PeerJ","license":[{"start":{"date-parts":[[2018,7,25]],"date-time":"2018-07-25T00:00:00Z","timestamp":1532476800000},"content-version":"unspecified","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100005668","name":"Funda\u00e7\u00e3o de Apoio \u00e0 Pesquisa do Distrito Federal","doi-asserted-by":"crossref","award":["193.000.040\/2012"],"award-info":[{"award-number":["193.000.040\/2012"]}],"id":[{"id":"10.13039\/501100005668","id-type":"DOI","asserted-by":"crossref"}]},{"name":"INCT-CNPq (Redoxoma\u2014Processos Redox em Biomedicina)"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"abstract":"<jats:p>This study aimed to characterize the antioxidant properties of Rama Forte persimmon, a tannin-rich fruit variety produced in Brazil. Extracts prepared with lyophilized pulps from fruits obtained in local markets were analyzed individually to evaluate the extent of antioxidant protection and investigate the antioxidant mechanism. Iron-mediated hydroxylation of 5,5-dimethyl-1-pirrolidine-N-oxide, determined by electron paramagnetic resonance (EPR), and oxidative degradation of 2-deoxyribose (2-DR) were inhibited by fruit extracts in a dose-dependent manner. There was a considerable individual variability in inhibition of 2-DR degradation by individual fruits. Higher protection of 2-DR degradation (by the extracts) was observed in Fe(III)-citrate\/ascorbate in comparison with Fe(III)-EDTA\/ascorbate system; however, antioxidant effectiveness of fruit extracts was not diminished by increasing EDTA concentration by 10-fold. Other competition experiments using the 2-DR assay (varying pre-incubation time and 2-DR concentration) indicated that protection comes mainly from free radical scavenging, rather that metal chelation antioxidant activity. Persimmon extracts prevented iron-mediated lipid peroxidation in rat liver homogenates, which correlated significantly with the inhibition of 2-DR oxidation. Finally, sugar content of individual fruits correlated inversely with inhibition of 2-DR degradation, which could indicate that maturation decreases soluble antioxidant concentration or efficiency. In conclusion, lipid peroxidation, 2-DR and EPR experiments indicated that extracts from commercial fruits showed mainly radical-scavenger activity and relevant antioxidant activity.<\/jats:p>","DOI":"10.7717\/peerj.5223","type":"journal-article","created":{"date-parts":[[2018,7,25]],"date-time":"2018-07-25T07:55:11Z","timestamp":1532505311000},"page":"e5223","source":"Crossref","is-referenced-by-count":5,"title":["Antioxidant activity and mechanism of commercial Rama Forte persimmon fruits (<i>Diospyros kaki<\/i>)"],"prefix":"10.7717","volume":"6","author":[{"given":"Luana T.","family":"Dalvi","sequence":"first","affiliation":[{"name":"Departamento de Biologia Celular, Universidade de Bras\u00edlia, Bras\u00edlia, Distrito Federal, Brazil"},{"name":"Departamento de Nutri\u00e7\u00e3o, Universidade de Bras\u00edlia, Bras\u00edlia, Distrito Federal, Brazil"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Daniel 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