Title page for ETD etd-12042002-124439


Type of Document Dissertation
Author Suloff, Eric Charles
URN etd-12042002-124439
Title Sorption Behavior of an Aliphatic Series of Aldehydes in the Presence of Poly(ethylene terephthalate) Blends Containing Aldehyde Scavenging Agents
Degree PhD
Department Food Science and Technology
Advisory Committee
Advisor Name Title
Blakistone, Barbara A. Committee Member
Duncan, Susan E. Committee Member
Long, Timothy E. Committee Member
Keywords
  • Active packaging
  • Diffusion
  • Migration
  • Milk
  • Off-flavors
  • Permeation
  • Scalping
  • Sorption
Date of Defense 2002-11-21
Availability unrestricted
Abstract
The quality of many beverages and food products is compromised by the presence of low molecular weight aldehydes. Aldehydes are commonly formed during storage by the oxidation of lipids or are introduced as migrants from polymeric packaging material. The objective of this project was to evaluate the effectiveness of three aldehyde scavenging agents, blended into poly(ethylene terephthalate) (PET) films, in removing an aliphatic series of aldehydes from an acidified aqueous model solution (pH 3.6) during storage. Aldehyde concentration in solution was determined by an improved high performance liquid chromatography method involving the formation of aldehyde-hydrazine complexes by 2,4-dinitrophenylhydrazine. Storage of 25 μM mixtures of acetaldehyde, propionaldehyde, butyraldehyde, valeraldehyde, and caproaldehyde in contact with PET films blended with 5% poly(m-xylylene adipamide) (nylon MXD6), D-sorbitol, or alpha-cyclodextrin reduced the concentration of each aldehyde in solution by 21 to 90% after 14 days of exposure. D-sorbitol and alpha-cyclodextrin aldehyde scavenging PET films were the most effective treatments for the reduction of aldehydes from solution showing similar average reductions for the five aldehyde species of 11.4 and 13.8 μM, respectively. PET films blended with nylon MXD6 were less effective in removing aldehydes from solution showing an average reduction of 8.4 μM for the five aldehyde species. However, nylon MXD6 proved to the most efficient aldehyde scavenging agent tested. D-sorbitol and alpha-cyclodextrin blends include 45 and 17 times more aldehyde scavenging sites then nylon MXD6 blends, but only showed 26 and 39% improvements in aldehyde scavenging ability when compared to nylon MXD6 blends. Aldehyde scavenging films demonstrated selective scalping preferring smaller molecular weight aldehydes, such as acetaldehyde, propionaldehyde, and butyraldehyde, more than larger aldehydes, valeraldehyde and caproaldehyde. Partition coefficients for smaller aldehydes were 3 to 6 times greater for aldehyde scavenging films then control film.
Files
  Filename       Size       Approximate Download Time (Hours:Minutes:Seconds) 
 
 28.8 Modem   56K Modem   ISDN (64 Kb)   ISDN (128 Kb)   Higher-speed Access 
  afrontmatter.pdf 131.94 Kb 00:00:36 00:00:18 00:00:16 00:00:08 < 00:00:01
  chapter1.pdf 63.01 Kb 00:00:17 00:00:09 00:00:07 00:00:03 < 00:00:01
  chapter2.pdf 47.24 Kb 00:00:13 00:00:06 00:00:05 00:00:02 < 00:00:01
  chapter3.pdf 421.10 Kb 00:01:56 00:01:00 00:00:52 00:00:26 00:00:02
  chapter4.pdf 1.88 Mb 00:08:41 00:04:28 00:03:54 00:01:57 00:00:10
  chapter5.pdf 742.39 Kb 00:03:26 00:01:46 00:01:32 00:00:46 00:00:03
  chapter6.pdf 6.10 Mb 00:28:14 00:14:31 00:12:42 00:06:21 00:00:32
  chapter7.pdf 11.25 Mb 00:52:05 00:26:47 00:23:26 00:11:43 00:01:00
  xbackmatter.pdf 43.33 Kb 00:00:12 00:00:06 00:00:05 00:00:02 < 00:00:01

Browse All Available ETDs by ( Author | Department )

dla home
etds imagebase journals news ereserve special collections
virgnia tech home contact dla university libraries

If you have questions or technical problems, please Contact DLA.