title: Creation of reduced fat foods: influence of calcium-induced droplet aggregation on microstructure and rheology of mixed food dispersions.
abstract: The impact of calcium-induced fat droplet aggregation on the microstructure and physicochemical properties of model mixed colloidal dispersions was investigated. These systems consisted of 2 wt% whey protein-coated fat droplets and 4 wt% modified starch granules heated to induce starch swelling (pH 7). Optical and confocal microscopy showed that the fat droplets were dispersed within the interstitial region between the swollen starch granules. The structural organisation of the fat droplets within these interstitial regions could be modulated by controlling the calcium concentration: (i) at a low calcium concentration the droplets were evenly distributed; (ii) at an intermediate calcium concentration they formed a layer around the starch granules; (iii) at a high calcium concentration they formed a network of aggregated droplets. Paste-like materials were produced when the fat droplets formed a three-dimensional network in the interstitial region. The properties of fat droplet-starch granule suspensions can be modulated by altering the electrostatic interactions to alter microstructure.
authors.affiliation: Department of Food Science, University of Massachusetts, Amherst, MA 01003, USA.
authors.forename: Bi-cheng
authors.initials: BC
authors.lastname: Wu
authors.forename: Brian
authors.initials: B
authors.lastname: Degner
authors.forename: David Julian
authors.initials: DJ
authors.lastname: McClements
mesh_terms: D002118:Calcium / Q000737:chemistry*; D004041:Dietary Fats / Q000032:analysis*; D005504:Food Analysis; D006863:Hydrogen-Ion Concentration; D008894:Milk Proteins / Q000737:chemistry*; D010316:Particle Size; D012212:Rheology; D013213:Starch / Q000737:chemistry*; D000067816:Whey Proteins
chemical_list: D004041:Dietary Fats; D008894:Milk Proteins; D000067816:Whey Proteins; D013213:Starch; D002118:Calcium
keywords: Aggregation; Calcium; Dispersions; Droplet; Electrostatic; Emulsion; Reduced fat; Rheology; Starch