title: Effect of the ionic liquid 1-ethyl-3-methylimidazolium acetate on the phase transition of starch: dissolution or gelatinization?
abstract: This work revealed that the interactions between starch, the ionic liquid 1-ethyl-3-methylimidazolium acetate ([Emim][OAc]), and water might contribute to the phase transition (gelatinization, dissolution, or both) of native starch at reduced temperature. Using mixtures of water and [Emim][OAc] at certain ratios (7.2/1 and 10.8/1 mol/mol), both the gelatinization and dissolution of the starch occur competitively, but also in a synergistic manner. At lower [Emim][OAc] concentration (water/[Emim][OAc] molar ratio≥25.0/1), mainly gelatinization occurs which is slightly impeded by the strong interaction between water and [Emim][OAc]; while at higher [Emim][OAc] concentration (water/[Emim][OAc] molar ratio≤2.8/1), the dissolution of starch is the major form of phase transition, possibly restricted by the difficulty of [Emim][OAc] to interact with starch.
authors.affiliation: Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, Brisbane, QLD 4072, Australia.
authors.forename: Sainimili
authors.initials: S
authors.lastname: Mateyawa
authors.forename: David Fengwei
authors.initials: DF
authors.lastname: Xie
authors.forename: Rowan W
authors.initials: RW
authors.lastname: Truss
authors.forename: Peter J
authors.initials: PJ
authors.lastname: Halley
authors.forename: Timothy M
authors.initials: TM
authors.lastname: Nicholson
authors.forename: Julia L
authors.initials: JL
authors.lastname: Shamshina
authors.forename: Robin D
authors.initials: RD
authors.lastname: Rogers
authors.forename: Michael W
authors.initials: MW
authors.lastname: Boehm
authors.forename: Tony
authors.initials: T
authors.lastname: McNally
mesh_terms: D000688:Amylose / Q000737:chemistry; D002152:Calorimetry, Differential Scanning; D006863:Hydrogen-Ion Concentration; D007093:Imidazoles / Q000737:chemistry*; D052578:Ionic Liquids / Q000737:chemistry*; D044367:Phase Transition; D012997:Solvents / Q000737:chemistry; D013213:Starch / Q000737:chemistry*; D014783:Viscosity; D014867:Water / Q000737:chemistry; D003313:Zea mays / Q000737:chemistry
chemical_list: D007093:Imidazoles; D052578:Ionic Liquids; D012997:Solvents; D014867:Water; D013213:Starch; D000688:Amylose; C518739:1-ethyl-3-methylimidazolium