Estimation of the age of human bloodstains under the simulated indoor and outdoor crime scene conditions by ATR-FTIR spectroscopy

Abstract Estimation of the age of human bloodstains is of great importance in forensic practices, but it is a challenging task because of the lack of a well-accepted, reliable, and established method. Here, the attenuated total reflection (ATR)-Fourier transform infrared (FTIR) technique combined wi...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	Hancheng Lin, Yinming Zhang, Qi Wang, Bing Li, Ping Huang, Zhenyuan Wang
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/c36dcf35482b43b6aaa0a6dead0785b9
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

id	oai:doaj.org-article:c36dcf35482b43b6aaa0a6dead0785b9
record_format	dspace
spelling	oai:doaj.org-article:c36dcf35482b43b6aaa0a6dead0785b92021-12-02T15:04:54ZEstimation of the age of human bloodstains under the simulated indoor and outdoor crime scene conditions by ATR-FTIR spectroscopy10.1038/s41598-017-13725-12045-2322https://doaj.org/article/c36dcf35482b43b6aaa0a6dead0785b92017-10-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-13725-1https://doaj.org/toc/2045-2322Abstract Estimation of the age of human bloodstains is of great importance in forensic practices, but it is a challenging task because of the lack of a well-accepted, reliable, and established method. Here, the attenuated total reflection (ATR)-Fourier transform infrared (FTIR) technique combined with advanced chemometric methods was utilized to determine the age of indoor and outdoor bloodstains up to 107 days. The bloodstain storage conditions mimicked crime scene scenarios as closely as possible. Two partial least squares regression models—indoor and outdoor models with 7–85 days—exhibited good performance for external validation, with low values of predictive root mean squared error (5.83 and 4.77) and high R2 values (0.94 and 0.96) and residual predictive deviation (4.08 and 5.14), respectively. Two partial least squares–discriminant analysis classification models were built and demonstrated excellent distinction between fresh (age ≤1 d) and older (age >1 d) bloodstains, which is highly valuable for forensic investigations. These findings demonstrate that ATR-FTIR spectroscopy coupled with advanced chemometric methods can be employed as a rapid and non-destructive tool for age estimation of bloodstains in real-world forensic investigation.Hancheng LinYinming ZhangQi WangBing LiPing HuangZhenyuan WangNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-9 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Hancheng Lin Yinming Zhang Qi Wang Bing Li Ping Huang Zhenyuan Wang Estimation of the age of human bloodstains under the simulated indoor and outdoor crime scene conditions by ATR-FTIR spectroscopy
description	Abstract Estimation of the age of human bloodstains is of great importance in forensic practices, but it is a challenging task because of the lack of a well-accepted, reliable, and established method. Here, the attenuated total reflection (ATR)-Fourier transform infrared (FTIR) technique combined with advanced chemometric methods was utilized to determine the age of indoor and outdoor bloodstains up to 107 days. The bloodstain storage conditions mimicked crime scene scenarios as closely as possible. Two partial least squares regression models—indoor and outdoor models with 7–85 days—exhibited good performance for external validation, with low values of predictive root mean squared error (5.83 and 4.77) and high R2 values (0.94 and 0.96) and residual predictive deviation (4.08 and 5.14), respectively. Two partial least squares–discriminant analysis classification models were built and demonstrated excellent distinction between fresh (age ≤1 d) and older (age >1 d) bloodstains, which is highly valuable for forensic investigations. These findings demonstrate that ATR-FTIR spectroscopy coupled with advanced chemometric methods can be employed as a rapid and non-destructive tool for age estimation of bloodstains in real-world forensic investigation.
format	article
author	Hancheng Lin Yinming Zhang Qi Wang Bing Li Ping Huang Zhenyuan Wang
author_facet	Hancheng Lin Yinming Zhang Qi Wang Bing Li Ping Huang Zhenyuan Wang
author_sort	Hancheng Lin
title	Estimation of the age of human bloodstains under the simulated indoor and outdoor crime scene conditions by ATR-FTIR spectroscopy
title_short	Estimation of the age of human bloodstains under the simulated indoor and outdoor crime scene conditions by ATR-FTIR spectroscopy
title_full	Estimation of the age of human bloodstains under the simulated indoor and outdoor crime scene conditions by ATR-FTIR spectroscopy
title_fullStr	Estimation of the age of human bloodstains under the simulated indoor and outdoor crime scene conditions by ATR-FTIR spectroscopy
title_full_unstemmed	Estimation of the age of human bloodstains under the simulated indoor and outdoor crime scene conditions by ATR-FTIR spectroscopy
title_sort	estimation of the age of human bloodstains under the simulated indoor and outdoor crime scene conditions by atr-ftir spectroscopy
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/c36dcf35482b43b6aaa0a6dead0785b9
work_keys_str_mv	AT hanchenglin estimationoftheageofhumanbloodstainsunderthesimulatedindoorandoutdoorcrimesceneconditionsbyatrftirspectroscopy AT yinmingzhang estimationoftheageofhumanbloodstainsunderthesimulatedindoorandoutdoorcrimesceneconditionsbyatrftirspectroscopy AT qiwang estimationoftheageofhumanbloodstainsunderthesimulatedindoorandoutdoorcrimesceneconditionsbyatrftirspectroscopy AT bingli estimationoftheageofhumanbloodstainsunderthesimulatedindoorandoutdoorcrimesceneconditionsbyatrftirspectroscopy AT pinghuang estimationoftheageofhumanbloodstainsunderthesimulatedindoorandoutdoorcrimesceneconditionsbyatrftirspectroscopy AT zhenyuanwang estimationoftheageofhumanbloodstainsunderthesimulatedindoorandoutdoorcrimesceneconditionsbyatrftirspectroscopy
_version_	1718389040623910912

Estimation of the age of human bloodstains under the simulated indoor and outdoor crime scene conditions by ATR-FTIR spectroscopy

Ejemplares similares