Document Detail

Combining asymmetrical flow field-flow fractionation with light-scattering and inductively coupled plasma mass spectrometric detection for characterization of nanoclay used in biopolymer nanocomposites.
MedLine Citation:
PMID:  19927249     Owner:  NLM     Status:  In-Process    
It is expected that biopolymers obtained from renewable resources will in due course become fully competitive with fossil fuel-derived plastics as food-packaging materials. In this context, biopolymer nanocomposites are a field of emerging interest since such materials can exhibit improved mechanical and barrier properties and be more suitable for a wider range of food-packaging applications. Natural or synthetic clay nanofillers are being investigated for this purpose in a project called NanoPack funded by the Danish Strategic Research Council. In order to detect and characterize the size of clay nanoparticulates, an analytical system combining asymmetrical flow field-flow fractionation (AF(4)) with multi-angle light-scattering detection (MALS) and inductively coupled plasma mass spectrometry (ICP-MS) is presented. In a migration study, we tested a biopolymer nanocomposite consisting of polylactide (PLA) with 5% Cloisite30B (a derivatized montmorillonite clay) as a filler. Based on AF(4)-MALS analyses, we found that particles ranging from 50 to 800 nm in radius indeed migrated into the 95% ethanol used as a food simulant. The full hyphenated AF(4)-MALS-ICP-MS system showed, however, that none of the characteristic clay minerals was detectable, and it is concluded that clay nanoparticles were absent in the migrate. Finally, by means of centrifugation experiments, a platelet aspect ratio of 320 was calculated for montmorillonite clay using AF(4)-MALS for platelet size measurements.
B Schmidt; J H Petersen; C Bender Koch; D Plackett; N R Johansen; V Katiyar; E H Larsen
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Food additives & contaminants. Part A, Chemistry, analysis, control, exposure & risk assessment     Volume:  26     ISSN:  1944-0057     ISO Abbreviation:  Food Addit Contam Part A Chem Anal Control Expo Risk Assess     Publication Date:  2009 Dec 
Date Detail:
Created Date:  2009-11-20     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101485040     Medline TA:  Food Addit Contam Part A Chem Anal Control Expo Risk Assess     Country:  England    
Other Details:
Languages:  eng     Pagination:  1619-27     Citation Subset:  IM    
Department of Basic Sciences and Environment, University of Copenhagen, Frederiksberg, C DK-1871, Denmark.
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