Collection and detection of latent fingermarks contaminated with cosmetics on nonporous and porous surfaces

Ricci, Camilla; Kazarian, Sergei G.

doi:10.1002/sia.3098

Cited by 42 publications

(24 citation statements)

References 26 publications

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“…Thus, by using vibrational spectroscopy (Raman and IR), it is from spectral uniqueness, or the “chemical fingerprint”, possible to identify foreign compounds in the FM . In this respect, IR hyperspectral imaging has been used to study FMs contaminated with residues from cosmetics and drugs, as well as chemical degradation (aging) of latent fingerprint residues in a controlled environment . Additionally, new concepts have been developed utilizing Raman hyperspectral imaging on contaminated FM .…”

Section: Figurementioning

confidence: 99%

Towards Fingermark Dating: A Raman Spectroscopy Proof‐of‐Concept Study

et al. 2017

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Fingermarks have, for a long time, been vital in the forensic community for the identification of individuals, and a possibility to non‐destructively date the fingermarks would of course be beneficial. Raman spectroscopy is, herein, evaluated for the purpose of estimating the age of fingermarks deposits. Well‐resolved spectra were non‐destructively acquired to reveal spectral uniqueness, resembling those of epidermis, and several molecular markers were identified that showed different decay kinetics: carotenoids > squalene > unsaturated fatty acids > proteins. The degradation rates were accelerated, less pronounced for proteins, when samples were stored under ambient light conditions, likely owing to photo‐oxidation. It is hypothesized that fibrous proteins are present and that oxidation of amino acid side chains can be observed both through Raman and fluorescence spectroscopy. Clearly, Raman spectroscopy is a useful technique to non‐destructively study the aging processes of fingermarks.

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Section: Figurementioning

confidence: 99%

Towards Fingermark Dating: A Raman Spectroscopy Proof‐of‐Concept Study

et al. 2017

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“…The applications of FTIR imaging are steadily expanding and include pharmaceutical materials, 1-3 polymer processes, 4-5 biological samples, 6 forensic studies 7 as well as art and heritage samples. 8 FTIR imaging is mostly conducted either in transmission, reflectance or Attenuated Total Reflection (ATR) modes.…”

Section: Introductionmentioning

confidence: 99%

Correcting the Effect of Refraction and Dispersion of Light in FT-IR Spectroscopic Imaging in Transmission through Thick Infrared Windows

Chan

Kazarian

2012

Anal. Chem.

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Transmission mode is one of the most common sampling methods for FTIR spectroscopic imaging because the spectra obtained generally have a reasonable signal to noise ratio. However, dispersion and refraction of infrared light occurs when samples are sandwiched between infrared windows or placed underneath a layer of liquid. Dispersion and refraction cause infrared light to focus with different focal lengths depending on the wavelength (wavenumber) of the light. As a result, images obtained are in focus only at a particular wavenumber while they are defocused at other wavenumber values. In this work, a solution to correct this spread of focus by means of adding a lens on top of the infrared transparent window, such that a pseudo hemisphere is formed, has been investigated. Through this lens (or hemisphere), refraction of light is removed and the light across the spectral range has the same focal depth. Furthermore, the lens acts as a solid immersion objective and an increase of both magnification and spatial resolution (by 1.4 times) is demonstrated. The spatial resolution was investigated using an USAF resolution target, showing that the Rayleigh criterion can be achieved, as well as a sample with a sharp polymer interface to indicate the spatial resolution that can be expected in real samples. The reported approach was used to obtain chemical images of cross-sections of cancer tissue and hair samples sandwiched between infrared windows showing the versatility and applicability of the method. In addition to the improved spatial resolution, the results reported herein also demonstrate that the lens can reduce the effect of scattering near the edges of tissue samples. The advantages of the presented approach, obtaining FTIR spectroscopic images in transmission mode with the same focus across all wavenumber values and simultaneous improvement in spatial resolution, will have wide implications ranging from studies of live cells to sorption of drugs into tissues.

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“…For a heterogeneous system, the detection limit, apart from being a function of the SNR, is also determined by the sample volume that is being measured. The identification of cosmetics from lifted fingerprints has also been shown [103]. This could be achieved by use of an aperture as illustrated schematically in Figure 9.22.…”

Section: Detection Of Trace Materials and Chemical Fingerprintingmentioning

confidence: 99%

FT‐IR Imaging in ATR and Transmission Modes: Practical Considerations and Emerging Applications

Dougan

Chan

Kazarian

2014

Infrared and Raman Spectroscopic Imaging

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Fourier transform infrared (FT-IR) spectroscopic imaging is a powerful chemical imaging technique. A range of approaches and applications of FT-IR imaging have been developed in both attenuated total reflection (ATR) and transmission modes for a broad range of materials and chemical systems. ATR and transmission approaches are often complementary -providing different advantages depending on the requirements of the system under study with respect to chemical composition, field of view (FOV), or spatial resolution, for instance.FT-IR spectroscopic imaging is achieved by coupling an FT-IR spectrometer with a focal plane array (FPA) detector. Unlike single-element detectors, which provide an average signal from the illuminated sample area, FPA detectors allow the simultaneous detection of spatially resolved spectra across the whole imaged area as shown schematically in Figure 9.1. This powerful approach of coupling FT-IR spectroscopy with FPA detectors and thereby obtaining simultaneous, spatially resolved spectra allows systems to be studied as a function of spectral, spatial, and temporal domains. Since a full spectrum is recorded at each pixel, different chemical species and their relationship with one another can be revealed by studying the resulting images. Generally, the images are prepared by plotting the distribution of the integrated absorbance of a vibrational band of interest and assigning a false color to indicate its relative absorbance. Many images showing the distribution of different components in the sample can be generated from a single imaging measurement simply by post-measurement data analysis. Other parameters such as band position or width can be used to reveal chemical information about the system.Single-element detectors or linear array detectors are capable of building chemical images through point-by-point mapping or raster scanning, respectively. Although this may be sufficient for some applications, the increased time required and the consecutive collection of spectra to build an image may not permit the study of dynamic systems nor is it particularly suitable for high-throughput studies.

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Collection and detection of latent fingermarks contaminated with cosmetics on nonporous and porous surfaces

Cited by 42 publications

References 26 publications

Towards Fingermark Dating: A Raman Spectroscopy Proof‐of‐Concept Study

Towards Fingermark Dating: A Raman Spectroscopy Proof‐of‐Concept Study

Correcting the Effect of Refraction and Dispersion of Light in FT-IR Spectroscopic Imaging in Transmission through Thick Infrared Windows

FT‐IR Imaging in ATR and Transmission Modes: Practical Considerations and Emerging Applications

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