Exploitation of very small particles to enhance the probative value of carpet fibers

Stoney, David A.; Neumann, Cédric; Mooney, Kim E.; Wyatt, J. Matney; Stoney, Paul L.

doi:10.1016/j.forsciint.2015.04.003

Cited by 12 publications

(4 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The fiber chemical characteristics may be related to the raw fiber core material, may originate from fiber processing, or may be acquired from the fiber's environment. For example, trace metals in fibers have been investigated for forensic analysis [1,2]. Moreover, compounds absorbed from the fiber's environment such as drugs, fragrance, and whitening agents from laundry detergent have shown potential for enhancing the evidential value of fibers [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Detection and diversity of fluorinated oil‐ and water‐repellent coatings on apparel fibers

Dolan

Jorabchi

2021

Journal of Forensic Sciences

View full text Add to dashboard Cite

Fluorinated coatings, often used for oil and water repellency and stain resistance in fabrics, are potentially persistent forensic fiber markers. However, they have received limited attention because of challenges in their detection caused by the small size of a single fiber and thin nature of stain-resistant coatings. Here, we utilize a sensitive fluorine-selective analytical technique to detect and evaluate diversity of fluorinated coatings in apparel. Twelve clothing items marketed as stain-resistant were tested with nine showing oil-and water-repellent properties. Fluorinated pyrolysis products of single fibers from all of the nine items were detected by gas chromatography coupled to plasma-assisted reaction chemical ionization mass spectrometry (GC-PARCI-MS), indicating the prevalence of fluoropolymer coatings in stain-resistant clothing articles. Furthermore, three major classes of fluorinated coatings were identified via principal component analysis of pyrogram patterns. The classes were coatingspecific and did not correlate with fiber core and color, highlighting a robust detection methodology. To evaluate the effect of fiber lifting in crime scenes, fibers from the 9 clothing items were used to develop a multinomial logistic regression model based on pyrogram principal components. The model was then tested using fibers subjected to contact with Post-it ® notes. The test set fibers were sampled from the clothing items of the training set and from three additional garments of differing color but the same brands as the training set. The coating classes were predicted with 98.4% accuracy, confirming robust classification of fiber coatings using py-GC-PARCI-MS regardless of fiber color, core, and fiber lifting.

show abstract

Section: Introductionmentioning

confidence: 99%

Detection and diversity of fluorinated oil‐ and water‐repellent coatings on apparel fibers

Dolan

Jorabchi

2021

Journal of Forensic Sciences

View full text Add to dashboard Cite

show abstract

“…Hence the goal of the present study is to verify, as done previously for several inorganic substrates [ 20 – 25 ], if and how skin could be the recipient of traces from the environment and highlight the importance of corpse debris research to identify where the body has been exposed or what it has been put in direct contact with and to evaluate any qualitative changes of the debris over time, with particular attention to the progression of putrefactive phenomena.…”

Section: Introductionmentioning

confidence: 87%

Skin surface debris as an archive of environmental traces: an investigation through the naked eye, episcopic microscope, ED-XRF, and SEM–EDX

et al. 2023

View full text Add to dashboard Cite

Traces from bodies can be of various nature, for example of biological or inorganic origin. Some of these historically have received more consideration than others in forensic practice. Samplings of gunshot residues or biological fluid traces are commonly standardized, whereas macroscopically invisible environmental traces are usually ignored. This paper simulated the interaction between a cadaver and a crime scene by placing skin samples on the ground of five different workplaces and inside the trunk of a car. Traces on samples were then investigated through different approaches: the naked eye, episcopic microscope, Scanning Electron Microscopy (SEM) with Energy-dispersive X-ray spectroscopy (EDX) and Energy Dispersive X-Ray Fluorescence (ED-XRF). The purpose is to provide the forensic scientist with the awareness of the value of debris on skin and then to highlight implications for forensic investigations. Results demonstrated that even naked eye observation can reveal useful trace materials, for defining the possible surrounding environment. As a next step, the episcopic microscope can increase the number of visible particulates and their analysis. In parallel, the ED-XRF spectroscopy can be useful to add a first chemical composition to the morphological data. Finally, the SEM–EDX analysis on small samples can provide the greatest morphological detail and the most complete chemical analysis, although limited, like the previous technique, to inorganic matrices. The analysis of debris on the skin, even with the difficulties due to the presence of contaminants, can provide information on the environments involved in criminal events that can add to the investigation framework.

show abstract

“…We hypothesized that the problem of dye fluorescence can be overcome using nearinfrared excitation in RS. Previously reported results in our group demonstrated that the use of 830 nm electromagnetic radiation could be used to overcome the problem of chlorophyll fluorescence in the Raman-based analysis of plant leaves [44]. Expanding upon this, we determine the extent to which near-infrared RS (NIRS) could be used to detect and identify colorants on fabric.…”

Section: Introductionmentioning

confidence: 89%

Non-Destructive Identification of Dyes on Fabric Using Near-Infrared Raman Spectroscopy

Peterson,

Kurouski

2023

Molecules

View full text Add to dashboard Cite

Fabric is a commonly found piece of physical evidence at most crime scenes. Forensic analysis of fabric is typically performed via microscopic examination. This subjective approach is primarily based on pattern recognition and, therefore, is often inconclusive. Most of the fabric material found at crime scenes is colored. One may expect that a confirmatory identification of dyes can be used to enhance the reliability of the forensic analysis of fabric. In this study, we investigated the potential of near-infrared Raman spectroscopy (NIRS) in the confirmatory, non-invasive, and non-destructive identification of 15 different dyes on cotton. We found that NIRS was able to resolve the vibrational fingerprints of all 15 colorants. Using partial-squared discriminant analysis (PLS-DA), we showed that NIRS enabled ~100% accurate identification of dyes based on their vibrational signatures. These findings open a new avenue for the robust and reliable forensic analysis of dyes on fabric directly at crime scenes. Main conclusion: a hand-held Raman spectrometer and partial least square discriminant analysis (PLS-DA) approaches enable highly accurate identification of dyes on fabric.

show abstract

Exploitation of very small particles to enhance the probative value of carpet fibers

Cited by 12 publications

References 2 publications

Detection and diversity of fluorinated oil‐ and water‐repellent coatings on apparel fibers

Detection and diversity of fluorinated oil‐ and water‐repellent coatings on apparel fibers

Skin surface debris as an archive of environmental traces: an investigation through the naked eye, episcopic microscope, ED-XRF, and SEM–EDX

Non-Destructive Identification of Dyes on Fabric Using Near-Infrared Raman Spectroscopy

Contact Info

Product

Resources

About