Isolated starches from yams (Dioscorea sp) grown at the Venezuelan Amazons: Structure and functional properties

Perez Elevina, Rolland-Sabaté Agnès, Dufour Dominique, Guzman Romel, Tapia Maria Soledad, Raymundez Maria, Ricci Julien, Guilois Sophie, Pontoire Bruno, Reynes Max, Gibert Olivier. 2013. Isolated starches from yams (Dioscorea sp) grown at the Venezuelan Amazons: Structure and functional properties. Carbohydrate Polymers, 98 (1) : 650-658.

https://doi.org/10.1016/j.carbpol.2013.06.051

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Quartile : Q1, Sujet : CHEMISTRY, APPLIED / Quartile : Q1, Sujet : POLYMER SCIENCE / Quartile : Q1, Sujet : CHEMISTRY, ORGANIC

Résumé : This work aimed to characterize the molecular structure and functional properties of starches isolated from wild Dioscorea yams grown at the Amazons, using conventional and up-to-date methodologies. Among the high purity starches isolated (?99%), the chain lengths were similar, whereas variations in gelatinization profile were observed. Starches have shown varied-shaped granules with monomodal distribution, and B-type crystallinity. Variations in amylose contents found by three analyses were hypothesized being related to intermediate material. Linear chain lengths were similar, and their amylopectins showed a dense, spherical conformation and similar molecular characteristics. The average molar mass and the radius of gyration of the chromatograms of the yam amylopectin, M¯W and R¯G were ranging between 174 × 106 g mol?1 and 237 × 106 g mol?1, and 201 nm and 233 nm, respectively. The white yams starches were more sensible to enzymes than the other two. All starches have shown a wide range of functional and nutritional properties.

Mots-clés Agrovoc : igname, Dioscorea, amidon, structure chimique, propriété technologique, propriété rhéologique, propriété physicochimique, amylose

Mots-clés géographiques Agrovoc : Venezuela (République bolivarienne du), Amazonie

Classification Agris : Q04 - Composition des produits alimentaires
F60 - Physiologie et biochimie végétale

Champ stratégique Cirad : Axe 3 (2005-2013) - Alimentation accessible et de qualité

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