Acetaldehyde detection in PET bottles

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Acetaldehyde detection in PET bottles using Agilent 8860 GC with FID and Headspace 8697

Polyethylene terephthalate (PET) bottles are widely used for beverage packaging. However, for the application of PET bottles as packaging material for mineral water, the acetaldehyde content of the bottle wall should be minimized. Acetaldehyde is a thermal degradation product of the PET polymer by the reaction of the vinyl end groups. If acetaldehyde migrates into the bottled water, it might influence the taste of the bottled water or beverage especially if its carbonated.

The AA content of PET is generally determined using headspace gas chromatography. Since AA detection depends upon temperature and time, consistent instrument conditions must be defined for lab-to-lab comparisons.

Acetaldehyde detection in PET bottles
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GBA Solution’s Features

ApplicationAcetaldehyde residue analysis in PET Bottles
Measuring ObjectsSolid sample (granules)
Detection rangeppm
DetectorFID

Features

  • High Sensitivity
  • Integrated platform to control both Headspace and GC from Open Lab CDS
  • Excellent Repeatability & Reproducibility
  • Flexibility to use 10ml, 20 ml or 22 ml sample vials

Chromatogram

Above pictures shows the 20 uL injection of 1.0 mg/ml Acetaldehyde (AA) solution.

Calibration Curve

A standard of 1.0 mg/mL solution of AA dissolved in pure water. Prepared solution was injected in the amounts of 0.1, 1, 10, 20, 35, and 50 μL into six separate 20-mL headspace vials. The calibration curve was constructed with these six calibration standards, resulting in a correlation coefficient (R2) of 0.9998.

Summary

A method has been developed utilizing headspace sampling combined with gas chromatography and FID-detection.

The method is robust, and suitable for the determination of acetaldehyde in PET and possesses excellent repeatability and linearity. This method can match the lower detection limits for AA in Food set by various competent authorities. 

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