title: Physicochemical Properties of Starch from Dioscorea pyrifolia tubers.
abstract: Starch from Dioscorea pyrifolia tubers was characterized for its proximate composition, physicochemical properties and toxicity. This starch contains 44.47±1.86% amylose, 4.84±0.29% moisture, 0.88±0.21% ash, 1.34±0.11% proteins and 92.73±0.48% carbohydrates. X-ray diffraction (XRD) analysis showed a type-C starch with a relative crystallinity of 23.31±2.41%. The starch granules are polyhedral, with a diameter of 2.8 to 5.6μm and average size of 3.93±1.47μm. Initial, peak and finishing gelatinization temperatures for the starch were 71.51±0.07, 75.05±0.15, and 78.25±0.18°C, respectively; the gelatinization enthalpy was 3.86±0.02J/g, and the peak height index was 1.09±0.05. Thermogravimetric analysis showed a weight loss of 85.81±0.52% and a decomposition temperature of 320.16±0.35°C, which indicated that there was good thermal stability of the starch. Fish embryo toxicity (FET) showed that the starch was not toxic and that it was suitable for food and non-food industries.
authors.affiliation: School of Chemical Sciences and Food Technology, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor, Malaysia.
authors.forename: M S
authors.initials: MS
authors.lastname: Elmi Sharlina
authors.affiliation: School of Chemical Sciences and Food Technology, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor, Malaysia. Electronic address: wanyaa@ukm.edu.my.
authors.forename: W A
authors.initials: WA
authors.lastname: Yaacob
authors.affiliation: School of Chemical Sciences and Food Technology, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor, Malaysia.
authors.forename: Azwan Mat
authors.initials: AM
authors.lastname: Lazim
authors.affiliation: School of Biosciences and Biotechnology, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor, Malaysia.
authors.forename: Shazrul
authors.initials: S
authors.lastname: Fazry
authors.affiliation: School of Chemical Sciences and Food Technology, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor, Malaysia.
authors.forename: Seng Joe
authors.initials: SJ
authors.lastname: Lim
authors.affiliation: Food Technology Division, School of Industrial Technology, Universiti Sains Malaysia, 11800 USM, Penang, Malaysia.
authors.forename: Sapina
authors.initials: S
authors.lastname: Abdullah
authors.affiliation: School of Biosciences and Biotechnology, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor, Malaysia.
authors.forename: Akram
authors.initials: A
authors.lastname: Noordin
authors.affiliation: School of Biosciences and Biotechnology, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor, Malaysia.
authors.forename: Malina
authors.initials: M
authors.lastname: Kumaran
mesh_terms: D000688:Amylose / Q000032:analysis; D000818:Animals; D027742:Dioscorea / Q000737:chemistry*; D004625:Embryo, Nonmammalian / Q000187:drug effects; D006863:Hydrogen-Ion Concentration; D035281:Plant Tubers / Q000737:chemistry; D012995:Solubility; D013213:Starch / Q000032:analysis / Q000737:chemistry* / Q000648:ultrastructure; D013816:Thermodynamics
chemical_list: D013213:Starch; D000688:Amylose
keywords: Characterization; Dioscorea pyrifolia; Starch; Toxicity