Thermally Generated Volatile Compounds in Packaging Materials

Kim, Ho; Sg, Gilbert

doi:10.1021/bk-1989-0409.ch037

Cited by 3 publications

(1 citation statement)

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“…Approximately 65% of all LDPE produced is used for film production, and a large proportion of film is used for food packaging (Bakker, 1984). The processing of LDPE involves the application of high temperatures and shearing stresses which, combined in the presence of oxygen, usually cause thermal and oxidative degradation of the polymer (Kim and Gilbert, 1989;Kim-Kang, 1990). Appreciable levels of polyethylene (PE) degradation can occur, even under mild conditions (Al-Sammerai and Al-Nidway, 1989;Grassie and Scott, 1985), and so degradation products can be produced at all stages in the life cycle of the polymer including fabrication, processing, storage, and transportation.…”

Section: Introductionmentioning

confidence: 99%

Toward an Optimized Dynamic Headspace Method for the Study of Volatiles in Low-Density Polyethylene

Hodgson

O'Connor

Casey

et al. 1998

J. Agric. Food Chem.

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A dynamic headspace technique for detecting C6−C14 volatile organic compounds (VOCs) in low-density polyethylene (LDPE) is discussed in which VOCs are purged with N2, trapped at ambient temperatures on Tenax-GC, and identified by gas chromatography/mass spectrometry. The experimental variables are quantitatively modeled to enhance sensitivity of the technique. The rate of extraction of VOCs from LDPE and the rate of isothermal desorption of VOCs from Tenax-GC are first-order processes with rate constants of 2.79 × 10-5 and 1.53 × 10-3 s-1 respectively. Approximately 4.2% of extractable VOCs are present in the vapor phase at ambient temperature, and 21% of VOCs are liberated instantaneously from Tenax-GC during thermal desorption at 200 °C. The chromatographic peak area associated with each VOC, and the total peak area in the chromatographic window, vary with desorption temperature in accordance with the van't Hoff isochore with an “average” desorption enthalpy of 45.5 kJ mol-1. Keywords: Low-density polyethylene (LDPE); dynamic headspace sampling; gas chromatography/mass spectrometry (GC/MS); volatile organic compounds (VOCs); Tenax-GC; purge and trap; mathematical modeling

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Section: Introductionmentioning

confidence: 99%

Toward an Optimized Dynamic Headspace Method for the Study of Volatiles in Low-Density Polyethylene

Hodgson

O'Connor

Casey

et al. 1998

J. Agric. Food Chem.

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Review of Volatile Organic Compounds Derived From Polyethylene

Hodgson¹,

Casey²,

Bigger³

et al. 2000

Polymer-Plastics Technology and Engineering

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The formation of volatile organic compounds (VOCs) in polyethylene (PE) is a topic of concern to industries involved in the packaging of items such as foodstuffs and pharmaceuticals that are sensitive to organoleptic contamination. This article reviews the available literature on VOCs that originate from PE during its manufacture, processing, storage, and service life. The package-product interactions that may occur between PE and packaged foodstuffs are also considered together with the wide range of methods for the analysis of VOCs. The following analytical methods are discussed: (i) sensory evaluation, (ii) chromatographic techniques and their associated sampling techniques, including ORDER REPRINTS the "hot-jar" method and dynamic headspace sampling, (iii) gas chromatography-olfactory sensing, and (iv) artificial olfaction or "electronic nose" technology.

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