Wild blackthorn (Prunus spinosa L.) and hawthorn (Crataegus monogyna Jacq.) fruits as valuable sources of antioxidants.Abstract -Introduction. Many underutilized wild fruits have great nutritional and functional potential, providing chemical compounds with biological properties. Materials and methods. In the present work we quantified bioactive compounds such as vitamin C (ascorbic and dehydroascorbic acids), and total phenolic compounds composed mainly of phenolic acids, flavonols and anthocyanins, as well as evaluating the antioxidant capacity through different in vitro tests (Folin-Ciocalteu, ABTS ·+ , DPPH · and FRAP) in wild blackthorn (P. spinosa L.) and hawthorn (C. monogyna Jacq.) fruits of Spanish origin, including samples from different seasons and locations. Results and discussion. As expected, wide variability was found in the composition of fruits of the same species, which justifies the necessity of analyzing several batches of wild fruits, in order to have representative results taking into account the natural variability. Fruits of P. spinosa showed vitamin C content ranging between (5.14 and 15.35) mg·100 g -1 fw (mainly dehydroascorbic acid); total phenolic compounds ranged from (1851 to 3825) mg·100 g -1 fw, characterized by a high content of anthocyanins and phenolic acids. Fruits of C. monogyna presented (16 to 39) mg vitamin C·100 g -1 fw and (449 to 1438) mg total phenolic compounds·100 g -1 fw, characterized by a high content of phenolic acids and flavonols. Antioxidant capacity was higher for P. spinosa fruits than for C. monogyna fruits; DPPH · values showed a strong correlation with vitamin C, while phenolic compounds were a major contributor to the antioxidant activity of these fruit extracts. Fruits of P. spinosa and C. monogyna should be reconsidered as new valuable sources of safe and inexpensive antioxidants. Résumé -Introduction. Beaucoup de fruits d'espèces sauvages sous-utilisées ont un grand potentiel nutritionnel et fonctionnel car ils offrent des composés chimiques présentant des propriétés biologiques. Matériel et méthodes. Dans notre travail, nous avons quantifié les composés bioactifs tels que la vitamine C (acide ascorbique et acide déhydroascorbique), les composés totaux phénoliques constitués principalement par des acides phénoliques, des flavonols et des anthocyanines, et nous avons évalué la capacité antioxydante à l'aide de différents tests in vitro (FolinCiocalteu, ABTS ·+ , DPPH · , et FRAP) dans des fruits du prunellier sauvage (P. spinosa L.) et de l'aubépine (C. monogyna Jacq.) d'origine espagnole, à partir d'échantillons de différentes saisons et lieux. Résultats et discussion. Comme prévu, la composition des fruits d'une même espèce a présenté une grande variabilité ce qui a justifié d'analyser plusieurs lots de fruits sauvages, afin de disposer de résultats représentatifs tenant compte de la variabilité naturelle. Les fruits de P. spinosa ont montré une teneur en vitamine C comprise entre (5.14 et 15.35) mg·100 g -1 mf (principalement constituée d'acide déhy...

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Wild Arbutus unedo L. and Rubus ulmifolius Schott fruits are underutilized sources of valuable bioactive compounds with antioxidant capacity.Abstract -Introduction. Several studies reveal the important role played by 'lesser-known' wild fruits since they contain nutritional and functional compounds which have biological properties. Materials and methods. Our work studied the presence of bioactive compounds such as vitamin C (ascorbic acid and dehydroascorbic acid), total phenolic content, phenolic acids, flavonols, anthocyanins and the antioxidant capacity (FRAP, ABTS •+ and DPPH• in vitro tests) in wild fruits of Arbutus unedo L. and Rubus ulmifolius Schott of Spanish origin, including samples from different seasons and locations. Results and discussion. A wide variability was found in the composition of fruits of the same species, which substantiates the importance of analyzing several batches of wild fruits, to achieve representative results, taking into account the natural variability. Arbustus unedo fruits showed higher vitamin C, mainly in the ascorbic acid form, and phenolic content than R. ulmifolius [(172-419) mg ascorbic acid⋅100 g -1 fw vs. (5.99-26.83) mg ascorbic acid⋅100 g -1 fw, and (773-1621) mg total phenolic compounds⋅100 g -1 fw vs. (376-1326) mg total phenolic compounds⋅100 g -1 fw, respectively]; phenolic acids and anthocyanins are the major groups of phenolic compounds found in both species, with gallic acid and cyanidin 3-glucoside as the main compounds. Arbustus unedo fruits showed significantly higher Folin-Ciocalteu values than those of R. ulmifolius. These values are higher than those reported for the majority of berries. The significant correlations found among different antioxidant compounds (r > 0.6300, P < 0.001) may reveal a protective effect between ascorbic acid and phenolic acids or anthocyanins in the fruits. Therefore, Arbutus unedo and R. ulmifolius fruits should be considered as new important sources of safe antioxidants. Espagne / Arbutus unedo / Rubus ulmifolius / fruits / composés phénoliques / teneur en phénols / antioxidant

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