The analysis of clingfilms by infrared spectroscopy and thermal desorption capillary gas chromatography

Gilburt, Janet; Ingram, Jacqueline M.; Scott, Mark P.; Underhill, Mark

doi:10.1016/s0015-7368(91)73166-6

Cited by 18 publications

(7 citation statements)

References 7 publications

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“…For PVC cling films, weak absorptions using IR spectroscopy in the regions between 3800-3000 cm À1 and 1800-1500 cm À1 have been cited by Gilburt and co-workers as being able to provide qualitative discrimination between different rolls. 25 This finding was supported by Griffin and co-workers, who achieved qualitative discrimination using weak absorptions between 1650 and 1450 cm À1 . 17 Both of these studies also qualitatively assessed within-roll variation, with one finding no significant differences between IR spectra of samples taken every three metres over a thirty metre roll 25 and the other concluding that samples from the same roll had the same IR spectra.…”

Section: Introductionmentioning

confidence: 69%

“…25 This finding was supported by Griffin and co-workers, who achieved qualitative discrimination using weak absorptions between 1650 and 1450 cm À1 . 17 Both of these studies also qualitatively assessed within-roll variation, with one finding no significant differences between IR spectra of samples taken every three metres over a thirty metre roll 25 and the other concluding that samples from the same roll had the same IR spectra. 17 Similar assessments of the chemical variation of LDPE cling films have involved the use of mass spectrometric methods i.e.…”

Section: Introductionmentioning

confidence: 69%

“…Fourier transform infrared (FTIR) spectroscopy has been used in many studies to determine the base polymer. 17,22,25 Further, it has been reported that IR spectroscopy can also allow discrimination on a qualitative basis between PVC cling films based upon low intensity absorptions in the region 1650-1450 cm À1 , which were attributed in part to the different metal stearate stabilisers used. 17 Pyrolysis gas chromatography-mass spectrometry (Py-GC-MS) has also been reported as a method of determining the base polymer as polyethylene based on its characteristic thermal degradation pattern and MS fragmentation behaviour.…”

Section: Introductionmentioning

confidence: 99%

“…27 Thermal desorption capillary gas chromatography was shown to be able to qualitatively discriminate between twenty-two brands of both LDPE and PVC cling film. 25 Thermal methods, such as differential scanning calorimetry (DSC) 9,26 and thermogravimetric analysis (TGA), 28 have also proved useful in discriminating between polyethylene materials, in some cases using quantitative assessments. 9 Finally, Idoine and co-workers demonstrated that elemental analysis-isotope ratio mass spectrometry (EA-IRMS) is able to discriminate between different cling films, both PVC and non-PVC, based upon carbon, hydrogen and oxygen isotopic composition.…”

Section: Introductionmentioning

confidence: 99%

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A quantitative assessment of the chemical variation in food grade polyethylene cling film, a common wrapping material for illicit drugs, using attenuated total reflection-Fourier transform infrared spectroscopy

2012

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Cling film is commonly encountered in forensic investigations as a wrapping for drugs of abuse. The evidential value of a match between a known and a questioned piece of cling film is directly related to the level of the chemical variation both within and between samples. However, little is known about the chemical variation in cling film. To address this, attenuated total reflection-Fourier transform infrared spectroscopy (ATR-FTIR) was used to quantitatively assess the chemical variation in food grade lowdensity polyethylene (LDPE) cling film. Following acquisition of full scan IR spectra between 4000 and 650 cm À1 , a spectral region of potential discrimination between 1560 and 1200 cm À1 was identified. The complex series of weak, overlapping absorption bands in this region were deconvoluted and peaks fitted. Bivariate plots comparing each pair of normalised peak areas showed significant overlap of the data points for the different samples, indicating no between-sample chemical variation. Further, the same plots demonstrated that the extent of within-sample chemical variation was at least as great as that between samples. Thus, in the sample set evaluated in this study, it was not possible to discriminate between food grade LDPE cling films using ATR-FTIR spectroscopy due to a lack of quantifiable chemical variation. The study therefore highlights the possibility of false positive matches in the analysis of LDPE cling films and provides a methodology to evaluate the extent of chemical variation in a relevant reference population prior to undertaking casework.

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Section: Introductionmentioning

confidence: 69%

Section: Introductionmentioning

confidence: 69%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A quantitative assessment of the chemical variation in food grade polyethylene cling film, a common wrapping material for illicit drugs, using attenuated total reflection-Fourier transform infrared spectroscopy

2012

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“…Fourier transform infrared (FTIR) has been used extensively to determine different polymers within the film 17 , as has pyrolysis gas chromatography-mass spectrometry (Py-GC-MS) 18 , with FTIR being the preferred method due to the non-destructive nature of the process 17 . Discrimination between polyethylene films has been successfully achieved using thermal methodologies such as thermal desorption capillary gas chromatography 19 , differential scanning calorimetry (DSC) 20,21 , and thermogravimetric analysis (TGA) 22 .…”

Section: Introductionmentioning

confidence: 99%

Classification of polyethylene cling films by attenuated total reflectance-Fourier transform infrared spectroscopy and chemometrics

et al. 2017

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Attenuated total reflectance-Fourier transform infrared spectroscopy (ATR-FTIR) was utilised to analyse nine differently branded cling films. Principal component analysis (PCA) was used to assess the intra-sample variability, i.e. the variation within individual cling film rolls; as well as the inter-sample variability, which explores the variability between different rolls of cling film. Linear discriminant analysis (LDA) was then employed to develop a predictive classification model which gave 100 % correct differentiation between three brand groupings of cling film, and accurately classified all of the validation samples obtained from different rolls from the same manufacturers. † Deceased. Electronic Supplementary Information (ESI) available: Typical cling film spectrum and scores plot for PCA carried out over the full 4,000-400 cm -1 spectral region See

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PATTERN EVIDENCE | ‘Plastic’ Bag Striations

Roux

Bull

2000

Encyclopedia of Forensic Sciences

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The analysis of clingfilms by infrared spectroscopy and thermal desorption capillary gas chromatography

Cited by 18 publications

References 7 publications

A quantitative assessment of the chemical variation in food grade polyethylene cling film, a common wrapping material for illicit drugs, using attenuated total reflection-Fourier transform infrared spectroscopy

A quantitative assessment of the chemical variation in food grade polyethylene cling film, a common wrapping material for illicit drugs, using attenuated total reflection-Fourier transform infrared spectroscopy

Classification of polyethylene cling films by attenuated total reflectance-Fourier transform infrared spectroscopy and chemometrics

PATTERN EVIDENCE | ‘Plastic’ Bag Striations

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