AVALIAÇÃO FORENSE DE FIBRAS VIA MICRO ESPECTROSCOPIA (FTIR-ATR)
Autor(a) principal: | |
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Data de Publicação: | 2023 |
Outros Autores: | , , |
Tipo de documento: | Artigo |
Idioma: | por |
Título da fonte: | Revista Eletrônica Debates em Educação Científica e Tecnológica |
Texto Completo: | https://ojs.ifes.edu.br/index.php/ric/article/view/2250 |
Resumo: | Forensic assessments may involve sampling textile fibers when examining crime scenes. The need to characterize and identify these fibers is of great importance, as they can provide comprehensive information about a crime, linking a suspect to a location, based on characteristics such as length, diameter and, particularly, the composition of the fibers. Fourier transform infrared micro spectroscopy in attenuated total reflectance mode (micro FTIR-ATR) is considered a non-destructive, fast and practical method for fiber identification. In this study we performed a forensic evaluation of sixty textile fibers recovered from twenty fabrics, all with white color, via micro FTIR-ATR analysis. Fiber collection was based on the tape lifting method, in order to simulate a collection in a real crime scene. The data were plotted in a two-dimensional analysis of principal components and in a radar chart to favor the comparison of the composition of the materials. The results of the infrared spectra revealed that the technique allows the discrimination of textile fibers according to their spectral composition (cellulose, ester, polyester or a mixture of these compounds) and some characteristics, such as number and width of peaks, position of the peak according to the wave number, absorbance index related to peak sharpness. It was concluded that the technique was useful and practical in the forensic evaluation of the fibers, presenting quick and enlightening results. |
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AVALIAÇÃO FORENSE DE FIBRAS VIA MICRO ESPECTROSCOPIA (FTIR-ATR) ciências forensescena de crime;microvestígiosespectroscopiapoliésterforensic sciencecrime scenetrace evidencespectroscopypolyesterForensic assessments may involve sampling textile fibers when examining crime scenes. The need to characterize and identify these fibers is of great importance, as they can provide comprehensive information about a crime, linking a suspect to a location, based on characteristics such as length, diameter and, particularly, the composition of the fibers. Fourier transform infrared micro spectroscopy in attenuated total reflectance mode (micro FTIR-ATR) is considered a non-destructive, fast and practical method for fiber identification. In this study we performed a forensic evaluation of sixty textile fibers recovered from twenty fabrics, all with white color, via micro FTIR-ATR analysis. Fiber collection was based on the tape lifting method, in order to simulate a collection in a real crime scene. The data were plotted in a two-dimensional analysis of principal components and in a radar chart to favor the comparison of the composition of the materials. The results of the infrared spectra revealed that the technique allows the discrimination of textile fibers according to their spectral composition (cellulose, ester, polyester or a mixture of these compounds) and some characteristics, such as number and width of peaks, position of the peak according to the wave number, absorbance index related to peak sharpness. It was concluded that the technique was useful and practical in the forensic evaluation of the fibers, presenting quick and enlightening results.As avaliações forenses podem envolver a amostragem de fibras têxteis ao examinar cenas de crime. A necessidade de caracterizar e identificar essas fibras é de grande importância, pois elas podem fornecer informações abrangentes sobre um crime, ligando um suspeito a um local, com base em características como comprimento, diâmetro e, particularmente, a composição das fibras. A micro espectroscopia de infravermelho com transformada de Fourier em modo de refletância total atenuada (micro FTIR-ATR) é considerada um método não-destrutivo, rápido e prático na identificação de fibras. Neste estudo realizamos uma avaliação forense de sessenta fibras têxteis recuperadas de vinte tecidos, todos com coloração branca, via análise de micro FTIR-ATR. A coleta das fibras foi feita com base no método de levantamento de fita, a fim de simular uma coleta em cena real de crime. Os dados foram plotados em uma análise bidimensional de componentes principais e em gráfico de radar para favorecer a comparação da composição dos materiais. Os resultados dos espectros de infravermelho revelaram que a técnica permite a discriminação de fibras têxteis de acordo com sua composição espectral (celulose, éster, poliéster ou mistura desses compostos) e algumas características, como número e largura de picos, posição do pico de acordo com o número de onda, índice de absorbância relacionado à nitidez do pico. Concluiu-se que a técnica foi útil e prática na avaliação forense das fibras, apresentando resultados rápidos e esclarecedores.Instituto Federal do Espírito Santo2023-10-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://ojs.ifes.edu.br/index.php/ric/article/view/225010.36524/ric.v9i3.2250Revista Ifes Ciência ; v. 9 n. 3 (2023): Edição Especial: Ciências Forenses ; 01-162359-479910.36524/ric.v9i3reponame:Revista Eletrônica Debates em Educação Científica e Tecnológicainstname:Instituto Federal de Educação, Ciência e Tecnologia do Espírito Santo (IFES)instacron:IFESporhttps://ojs.ifes.edu.br/index.php/ric/article/view/2250/1076Copyright (c) 2023 Revista Ifes Ciência https://creativecommons.org/licenses/by-nc-nd/4.0info:eu-repo/semantics/openAccessTestoni, SamaraScorsatto Ortiz, Rafaelde Cássia Mariotti, KristianeAnastácio de Oliveira Camargo, Flávio2024-03-25T14:39:22Zoai::article/2250Revistahttps://ojs.ifes.edu.br/index.php/indexPUBhttps://ojs.ifes.edu.br/index.php/index/oairevistadect@gmail.com||sidneiquezada@gmail.com2236-21502179-6955opendoar:2024-03-25T14:39:22Revista Eletrônica Debates em Educação Científica e Tecnológica - Instituto Federal de Educação, Ciência e Tecnologia do Espírito Santo (IFES)false |
dc.title.none.fl_str_mv |
AVALIAÇÃO FORENSE DE FIBRAS VIA MICRO ESPECTROSCOPIA (FTIR-ATR) |
title |
AVALIAÇÃO FORENSE DE FIBRAS VIA MICRO ESPECTROSCOPIA (FTIR-ATR) |
spellingShingle |
AVALIAÇÃO FORENSE DE FIBRAS VIA MICRO ESPECTROSCOPIA (FTIR-ATR) Testoni, Samara ciências forenses cena de crime; microvestígios espectroscopia poliéster forensic science crime scene trace evidence spectroscopy polyester |
title_short |
AVALIAÇÃO FORENSE DE FIBRAS VIA MICRO ESPECTROSCOPIA (FTIR-ATR) |
title_full |
AVALIAÇÃO FORENSE DE FIBRAS VIA MICRO ESPECTROSCOPIA (FTIR-ATR) |
title_fullStr |
AVALIAÇÃO FORENSE DE FIBRAS VIA MICRO ESPECTROSCOPIA (FTIR-ATR) |
title_full_unstemmed |
AVALIAÇÃO FORENSE DE FIBRAS VIA MICRO ESPECTROSCOPIA (FTIR-ATR) |
title_sort |
AVALIAÇÃO FORENSE DE FIBRAS VIA MICRO ESPECTROSCOPIA (FTIR-ATR) |
author |
Testoni, Samara |
author_facet |
Testoni, Samara Scorsatto Ortiz, Rafael de Cássia Mariotti, Kristiane Anastácio de Oliveira Camargo, Flávio |
author_role |
author |
author2 |
Scorsatto Ortiz, Rafael de Cássia Mariotti, Kristiane Anastácio de Oliveira Camargo, Flávio |
author2_role |
author author author |
dc.contributor.author.fl_str_mv |
Testoni, Samara Scorsatto Ortiz, Rafael de Cássia Mariotti, Kristiane Anastácio de Oliveira Camargo, Flávio |
dc.subject.por.fl_str_mv |
ciências forenses cena de crime; microvestígios espectroscopia poliéster forensic science crime scene trace evidence spectroscopy polyester |
topic |
ciências forenses cena de crime; microvestígios espectroscopia poliéster forensic science crime scene trace evidence spectroscopy polyester |
description |
Forensic assessments may involve sampling textile fibers when examining crime scenes. The need to characterize and identify these fibers is of great importance, as they can provide comprehensive information about a crime, linking a suspect to a location, based on characteristics such as length, diameter and, particularly, the composition of the fibers. Fourier transform infrared micro spectroscopy in attenuated total reflectance mode (micro FTIR-ATR) is considered a non-destructive, fast and practical method for fiber identification. In this study we performed a forensic evaluation of sixty textile fibers recovered from twenty fabrics, all with white color, via micro FTIR-ATR analysis. Fiber collection was based on the tape lifting method, in order to simulate a collection in a real crime scene. The data were plotted in a two-dimensional analysis of principal components and in a radar chart to favor the comparison of the composition of the materials. The results of the infrared spectra revealed that the technique allows the discrimination of textile fibers according to their spectral composition (cellulose, ester, polyester or a mixture of these compounds) and some characteristics, such as number and width of peaks, position of the peak according to the wave number, absorbance index related to peak sharpness. It was concluded that the technique was useful and practical in the forensic evaluation of the fibers, presenting quick and enlightening results. |
publishDate |
2023 |
dc.date.none.fl_str_mv |
2023-10-01 |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
https://ojs.ifes.edu.br/index.php/ric/article/view/2250 10.36524/ric.v9i3.2250 |
url |
https://ojs.ifes.edu.br/index.php/ric/article/view/2250 |
identifier_str_mv |
10.36524/ric.v9i3.2250 |
dc.language.iso.fl_str_mv |
por |
language |
por |
dc.relation.none.fl_str_mv |
https://ojs.ifes.edu.br/index.php/ric/article/view/2250/1076 |
dc.rights.driver.fl_str_mv |
Copyright (c) 2023 Revista Ifes Ciência https://creativecommons.org/licenses/by-nc-nd/4.0 info:eu-repo/semantics/openAccess |
rights_invalid_str_mv |
Copyright (c) 2023 Revista Ifes Ciência https://creativecommons.org/licenses/by-nc-nd/4.0 |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
Instituto Federal do Espírito Santo |
publisher.none.fl_str_mv |
Instituto Federal do Espírito Santo |
dc.source.none.fl_str_mv |
Revista Ifes Ciência ; v. 9 n. 3 (2023): Edição Especial: Ciências Forenses ; 01-16 2359-4799 10.36524/ric.v9i3 reponame:Revista Eletrônica Debates em Educação Científica e Tecnológica instname:Instituto Federal de Educação, Ciência e Tecnologia do Espírito Santo (IFES) instacron:IFES |
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Instituto Federal de Educação, Ciência e Tecnologia do Espírito Santo (IFES) |
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IFES |
institution |
IFES |
reponame_str |
Revista Eletrônica Debates em Educação Científica e Tecnológica |
collection |
Revista Eletrônica Debates em Educação Científica e Tecnológica |
repository.name.fl_str_mv |
Revista Eletrônica Debates em Educação Científica e Tecnológica - Instituto Federal de Educação, Ciência e Tecnologia do Espírito Santo (IFES) |
repository.mail.fl_str_mv |
revistadect@gmail.com||sidneiquezada@gmail.com |
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