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| - Identification of 8-Nonenal as an Important Contributor to“Plastic” Off-Odor in Polyethylene Packaging
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| - Food and beverage products stored in polyethylene (PE) containers may absorb some of PE's volatileminor components and become tainted by its characteristic “plastic” odor. High-density PE containersthat had imparted “plastic” odor to an experimental corn chip product were analyzed by simultaneousdistillation/extraction to remove the volatile components, by gas chromatography/olfactometry (GC/O) to locate the offending components and by 2-D GC/mass spectrometry (MS) to identify the major“plastic” odor contributor (8-nonenal). The identification was made using high-resolution electronionization and chemical ionization MS data to narrow the possibilities to two isomers of nonenal,followed by retrieval of reference spectra and confirmatory synthesis. By monitoring 8-nonenal inHDPE containers and corn chips it was demonstrated that 8-nonenal tracks with “plastic” aromaobserved in containers and with “plastic” flavor observed in corn chips stored in the containers. Keywords: Polyethylene volatiles; HDPE; 8-nonenal; plastic off-odor; plastic off-flavor; packaging off-odor
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