title: Effects of cross-linking, capsule wall thickness, and compound hydrophobicity on aroma release from complex coacervate microcapsules.
abstract: Microcapsules were produced by complex coacervation with a gelatin-gum acacia wall and medium-chain-triglyceride core. Dry capsules were partially rehydrated and then loaded with model aroma compounds covering a range of volatility, hydrophobicity, and molecular structure. An experimental design was prepared to evaluate the effects of cross-linking, wall/core ratio, and volatile load level on aroma release from capsules in a hot, aqueous environment. The real-time release on rehydration was measured by monitoring the headspace of a vessel containing the capsules to proton transfer reaction mass spectrometry (PTR-MS). Data collected showed no effects of cross-linking or wall/core ratio on volatile release in hot water for any of the volatiles studied. When comparing real-time release of the prepared coacervates to a spray-dried equivalent, there was no difference in the release from hot water but the release was slower when coacervates were added to ambient-temperature water. We found volatile release to be primarily determined by compound partition coefficients (oil/water and water/air) and temperature.
authors.affiliation: Department of Food Science and Nutrition, University of Minnesota, 1334 Eckles Avenue, St. Paul, Minnesota 55108, USA. lecle003@umn.edu
authors.forename: Segolene
authors.initials: S
authors.lastname: Leclercq
authors.forename: Christian
authors.initials: C
authors.lastname: Milo
authors.forename: Gary A
authors.initials: GA
authors.lastname: Reineccius
mesh_terms: D003432:Cross-Linking Reagents; D004339:Drug Compounding / Q000379:methods*; D005421:Flavoring Agents / Q000008:administration & dosage* / Q000737:chemistry*; D005780:Gelatin; D006170:Gum Arabic; D057927:Hydrophobic and Hydrophilic Interactions; D013058:Mass Spectrometry; D009812:Odorants / Q000032:analysis*; D013696:Temperature; D014835:Volatilization; D014867:Water
chemical_list: D003432:Cross-Linking Reagents; D005421:Flavoring Agents; D014867:Water; D006170:Gum Arabic; D005780:Gelatin