Main content

Carriers for Controlled Release of Allyl Isothiocyanate, Diacetyl and Cinnamaldehyde for Antimicrobial Active Packaging

Show full item record

Title: Carriers for Controlled Release of Allyl Isothiocyanate, Diacetyl and Cinnamaldehyde for Antimicrobial Active Packaging
Author: Wang, Wenjing
Department: Department of Food Science
Program: Food Science
Advisor: Lim, Loong-TakWarriner, Keith
Abstract: Antimicrobial volatiles are gaining increasing interest for active packaging applications. However, many hurdles remain unresolved, especially on delivering antimicrobial compounds in a controlled manner to minimize undesired impacts on the packed products. In this thesis, two carriers were developed and characterized for controlled release of allyl isothiocyanate (AITC), diacetyl, and cinnamaldehyde. Controlled releases of AITC and diacetyl were achieved by incorporating these volatile compounds into polymer blends of different molecular weights. Results showed that increasing proportion of high molecular weight polymer in the blends resulted in lower diffusion rate of the volatiles due to higher proportion of crystalline phase in the polymeric carrier, but increased the zero order release kinetics due to exclusion of the antimicrobial compounds as the polymer crystallized. Exposing the polymeric carries to elevated RH induced plasticization and partial solubilisation of the polymer, thus accelerated the release of AITC and diacetyl vapors. The controlled release of cinnamaldehyde was achieved by encapsulating cinnamaldehyde in PLA-based nonwovens produced by electrospinning. Both DSC and FTIR data revealed the presence of interactions between cinnamaldehyde and PLA. The release rate of cinnamaldehyde from PLA-based nonwovens was accelerated when exposed to elevated RH (80 to 100% RH). The efficacies of the antimicrobial compounds, as well as antimicrobial-loaded carriers, were evaluated against mould, yeast, and bacteria. The optimal weight ratio was found to be 1:4:60 AITC:diacetyl:cinnamaldehyde. The antimicrobials-loaded carriers successfully extended the shelf life of mung bean sprouts, a model food system.
Date: 2016-05
Rights: Attribution-NonCommercial-NoDerivs 2.5 Canada
Terms of Use: All items in the Atrium are protected by copyright with all rights reserved unless otherwise indicated.

Files in this item

Files Size Format View Description
Wang_Wenjing_201605_MSc.pdf 3.130Mb PDF View/Open Thesis

This item appears in the following Collection(s)

Show full item record

Attribution-NonCommercial-NoDerivs 2.5 Canada Except where otherwise noted, this item's license is described as Attribution-NonCommercial-NoDerivs 2.5 Canada