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Development of a liquid extraction method and comparison with dynamic thermal stripping–thermal desorption (DTS–TD) method: sorption of D ‐limonene by flexible packaging films
Author(s) -
Caner Cengiz
Publication year - 2004
Publication title -
packaging technology and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.365
H-Index - 50
eISSN - 1099-1522
pISSN - 0894-3214
DOI - 10.1002/pts.646
Subject(s) - sorption , linear low density polyethylene , materials science , polypropylene , polyethylene terephthalate , desorption , extraction (chemistry) , polyethylene , polymer , stripping (fiber) , vinyl acetate , chemical engineering , thermal desorption , vinyl alcohol , chromatography , polymer chemistry , chemistry , organic chemistry , composite material , adsorption , copolymer , engineering
The sorption of D ‐limonene into polymeric structures in contact with food simulant liquids (ethanol and acetic acid solutions) was determined using two methods, liquid extraction (LE) and dynamic thermal stripping–thermal desorption (DTS–TD). The polymeric films studied were PP (polypropylene), PE/nylon/EVOH/PE (polyethylene/nylon/ethylene vinyl alcohol/polyethylene) and metPET/VA EVA/LLDPE (metallized polyethylene terephthalate/ethylenevinyl acetate/linear low density polyethylene). Our assessment showed that both LE and DTS–TD techniques are valuable procedures. LE was evaluated as an alternative method with the advantage of being a simplified process. It was possible to measure the amount of D ‐limonene in the polymers using both methods. Correlation between methods was >82% and for the single layer polymers >92%. The respective sorption values obtained by the two methods were also found to be in good agreement. LE is simple and rapid to perform and, in general, gives slightly lower results compared to DTS–TS sorption tests conducted with adequate food simulants. The results indicate that the liquid extraction method is an excellent technique for the determination of sorbate concentration in polymeric structures. Copyright © 2004 John Wiley & Sons, Ltd.