Acetaldehyde residue in polyethylene terephthalate (PET) bottles.
A simple sample preparation technique was developed for rapid analysis of acetaldehyde residue in Polyethylene Terephthalate (PET) bottles. A laboratory-built heating system was used and coupled with gas chromatography-flame ionization detector (GC-FID) at optimized conditions. The results were a tremendous reduction of the sample preparation time from 24 hours, for the conventional method, to only one hour. The analysis took only 1.5 min with other good analytical performances i.e. a low detection limit, 0.3 ng mL(- 1) and a wide linear dynamic range, 0.3 ng mL(- 1) to 6.6 microg mL(- 1) with R(2) > 0.99. Acetaldehyde residue in freshly blown bottles were analyzed and found in the range of 0.4 to 1.1 ng mL(- 1). The results were good agreement with the conventional 24-hour airspace method (P < 0.01). The PET-bottle sampling technique was also developed to minimize the complication of sample transportation and pre-concentration. A purge and trap technique was found to be the most suitable. Then, it was implemented and compared, the results showed no significant difference (P < 0.01) with and without purge and trap.
Choodum
Aree
A
Analytical and Environmental/Trace Analysis Research Unit, Department of Chemistry, Faculty of Science, Prince of Songkla University, Songkhla, Thailand.
Thavarungkul
Panote
P
Kanatharana
Proespichaya
P
D000079:Acetaldehyde / Q000032:analysis*; D001628:Beverages / Q000032:analysis*; D002849:Chromatography, Gas / Q000379:methods; D018857:Food Packaging; D011093:Polyethylene Terephthalates / Q000737:chemistry*; D012680:Sensitivity and Specificity; D013997:Time Factors
D011093:Polyethylene Terephthalates; D000079:Acetaldehyde