title: Effects of locust bean gum on the structural and rheological properties of resistant corn starch.
abstract: In this study, interactions between resistant corn starch (RS) (5% w/w) and locust bean gum (LBG) (0, 0.125, 0.25, 0.50 and 1.0% w/v) on the viscoelastic, pasting and morphological characteristics of aqueous dispersions were evaluated. Results showed that the storage modulus (G'), loss modulus (G''), and apparent viscosity values of starch/gum (RS/LBG) mixtures were enhanced with the addition of LBG, and the rheograms demonstrated a biphasic behavior. RS/LBG samples were predominantly either solid like (G' > G'') or viscous (G'' > G'), depending on the added concentration level of LBG. Gum addition also caused higher peak viscosity, breakdown and total set back of RS/LBG mixtures. A strong correlation between rheological and structural properties was found. Confocal laser scanning microscopy (CLSM) images confirmed the transition of starch particles from a scattered angular shape to clustered structures cross-linked by dense aggregate junction zones justifying the observed changes in rheological properties.
authors.affiliation: Department of Food Science and Agricultural Chemistry, McGill University, Macdonald Campus, 21111, Lakeshore Road, Ste. Anne-de-Bellevue, QC H9X 3V9 Canada.
authors.forename: Raza
authors.initials: R
authors.lastname: Hussain
authors.affiliation: Department of Food Science and Agricultural Chemistry, McGill University, Macdonald Campus, 21111, Lakeshore Road, Ste. Anne-de-Bellevue, QC H9X 3V9 Canada.
authors.forename: Ajaypal
authors.initials: A
authors.lastname: Singh
authors.affiliation: Department of Food Science and Agricultural Chemistry, McGill University, Macdonald Campus, 21111, Lakeshore Road, Ste. Anne-de-Bellevue, QC H9X 3V9 Canada.
authors.forename: Hamed
authors.initials: H
authors.lastname: Vatankhah
authors.affiliation: Department of Food Science and Agricultural Chemistry, McGill University, Macdonald Campus, 21111, Lakeshore Road, Ste. Anne-de-Bellevue, QC H9X 3V9 Canada.
authors.forename: Hosahalli S
authors.initials: HS
authors.lastname: Ramaswamy
keywords: Confocal laser scanning microscopy; Corn starch; Locust bean gum; Pasting properties; Rheology