title: Isolated starches from yams (Dioscorea sp) grown at the Venezuelan Amazons: structure and functional properties.
abstract: 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 174×10(6) g mol(-1) and 237×10(6) 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.
authors.affiliation: Instituto de Ciencia y Tecnología de Alimentos (ICTA), Facultad de Ciencias Universidad Central de Venezuela, Apartado Postal 47097, Caracas 1041-A, Venezuela. perezee@hotmail.com
authors.forename: Elevina
authors.initials: E
authors.lastname: Pérez
authors.forename: Agnès
authors.initials: A
authors.lastname: Rolland-Sabaté
authors.forename: Dominique
authors.initials: D
authors.lastname: Dufour
authors.forename: Romel
authors.initials: R
authors.lastname: Guzmán
authors.forename: María
authors.initials: M
authors.lastname: Tapia
authors.forename: Marìa
authors.initials: M
authors.lastname: Raymundez
authors.forename: Julien
authors.initials: J
authors.lastname: Ricci
authors.forename: Sophie
authors.initials: S
authors.lastname: Guilois
authors.forename: Bruno
authors.initials: B
authors.lastname: Pontoire
authors.forename: Max
authors.initials: M
authors.lastname: Reynes
authors.forename: Olivier
authors.initials: O
authors.lastname: Gibert
mesh_terms: D000688:Amylose / Q000737:chemistry; D055598:Chemical Phenomena; D027742:Dioscorea / Q000737:chemistry* / Q000235:genetics / Q000254:growth & development* / Q000378:metabolism; D005838:Genotype; D012212:Rheology; D013213:Starch / Q000737:chemistry* / Q000302:isolation & purification* / Q000378:metabolism; D013696:Temperature; D014687:Venezuela
chemical_list: D013213:Starch; D000688:Amylose
keywords: Functional properties; Granular structure; Non-conventional starch; Tropical starch; Yam starch