ABSTRACT
Migration from high-density polyethylene into different liquids (hexane, ethanol, lemon terpenes and their emulsions) was modelled using the response surfaces method. Polynomial equations (z = A + Bx + Cy + Dx2 + Ey2 + Fxy) were established and parameters determined for each compound. Correlation coefficients were generally > 90%. Analysis indicated that 2,4-bis(1,1-dimethylethyl)phenol, probably due to the degradation of the antioxidant additive tris(2,4-bis(1,1-dimethylethyl)phenyl)phosphite, migrated into each liquid tested, whatever the temperature. Oligomers (10-30 carbons) terminated by a vinyl group were also detected.
Subject(s)
Flavoring Agents/chemistry , Food Packaging , Models, Chemical , Polyethylene/chemistry , Chromatography, Gas/methods , Humans , Mass Spectrometry/methods , Temperature , Time FactorsABSTRACT
The mechanical properties of monolayers from two Acacia gums [Acacia senegal (L.) Willd. and Acacia seyal Del.] and their three fractions isolated by hydrophobic interaction chromatography were studied with a Langmuir film balance to obtain a more complete understanding of their action mode. The analysis of compression isotherms revealed that A. senegal gums globally exhibit better interfacial properties than A. seyal ones. The behavior of the whole gums appeared to be strongly influenced by their arabinogalactan-protein complex.
