{"title":"利用拉曼光谱测定加热血迹的沉积时间","authors":"Alexis P. Barber, Alexis R. Weber, Igor K. Lednev","doi":"10.1016/j.forc.2024.100549","DOIUrl":null,"url":null,"abstract":"<div><p>At the scene of violent crimes, bloodstain evidence is one of the most frequently found and valuable types of evidence. Determining the time since deposition (TSD) can allow for investigators to draw conclusions as to when a crime occurred. In this proof-of-concept study Raman spectroscopy paired with chemometrics were utilized for the prediction of TSD for bloodstains aged under an extreme thermal environment (55 °C) up to 48 h post deposition. This temperature was chosen to represent an internal condition of a vehicle left in direct sunlight. It was found that peripheral bloodstains degraded at a faster rate when exposed to an extreme thermal environment than when aged under ambient conditions. TSD quantitative predictions were accomplished through the creation of two classification models.</p></div>","PeriodicalId":324,"journal":{"name":"Forensic Chemistry","volume":"37 ","pages":"Article 100549"},"PeriodicalIF":2.6000,"publicationDate":"2024-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2468170924000018/pdfft?md5=540dea89138ed30984ee161f92f7e441&pid=1-s2.0-S2468170924000018-main.pdf","citationCount":"0","resultStr":"{\"title\":\"Raman spectroscopy to determine the time since deposition of heated bloodstains\",\"authors\":\"Alexis P. Barber, Alexis R. Weber, Igor K. Lednev\",\"doi\":\"10.1016/j.forc.2024.100549\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>At the scene of violent crimes, bloodstain evidence is one of the most frequently found and valuable types of evidence. Determining the time since deposition (TSD) can allow for investigators to draw conclusions as to when a crime occurred. In this proof-of-concept study Raman spectroscopy paired with chemometrics were utilized for the prediction of TSD for bloodstains aged under an extreme thermal environment (55 °C) up to 48 h post deposition. This temperature was chosen to represent an internal condition of a vehicle left in direct sunlight. It was found that peripheral bloodstains degraded at a faster rate when exposed to an extreme thermal environment than when aged under ambient conditions. TSD quantitative predictions were accomplished through the creation of two classification models.</p></div>\",\"PeriodicalId\":324,\"journal\":{\"name\":\"Forensic Chemistry\",\"volume\":\"37 \",\"pages\":\"Article 100549\"},\"PeriodicalIF\":2.6000,\"publicationDate\":\"2024-01-08\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"https://www.sciencedirect.com/science/article/pii/S2468170924000018/pdfft?md5=540dea89138ed30984ee161f92f7e441&pid=1-s2.0-S2468170924000018-main.pdf\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Forensic Chemistry\",\"FirstCategoryId\":\"3\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S2468170924000018\",\"RegionNum\":3,\"RegionCategory\":\"医学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q2\",\"JCRName\":\"CHEMISTRY, ANALYTICAL\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Forensic Chemistry","FirstCategoryId":"3","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S2468170924000018","RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"CHEMISTRY, ANALYTICAL","Score":null,"Total":0}
Raman spectroscopy to determine the time since deposition of heated bloodstains
At the scene of violent crimes, bloodstain evidence is one of the most frequently found and valuable types of evidence. Determining the time since deposition (TSD) can allow for investigators to draw conclusions as to when a crime occurred. In this proof-of-concept study Raman spectroscopy paired with chemometrics were utilized for the prediction of TSD for bloodstains aged under an extreme thermal environment (55 °C) up to 48 h post deposition. This temperature was chosen to represent an internal condition of a vehicle left in direct sunlight. It was found that peripheral bloodstains degraded at a faster rate when exposed to an extreme thermal environment than when aged under ambient conditions. TSD quantitative predictions were accomplished through the creation of two classification models.
期刊介绍：
Forensic Chemistry publishes high quality manuscripts focusing on the theory, research and application of any chemical science to forensic analysis. The scope of the journal includes fundamental advancements that result in a better understanding of the evidentiary significance derived from the physical and chemical analysis of materials. The scope of Forensic Chemistry will also include the application and or development of any molecular and atomic spectrochemical technique, electrochemical techniques, sensors, surface characterization techniques, mass spectrometry, nuclear magnetic resonance, chemometrics and statistics, and separation sciences (e.g. chromatography) that provide insight into the forensic analysis of materials. Evidential topics of interest to the journal include, but are not limited to, fingerprint analysis, drug analysis, ignitable liquid residue analysis, explosives detection and analysis, the characterization and comparison of trace evidence (glass, fibers, paints and polymers, tapes, soils and other materials), ink and paper analysis, gunshot residue analysis, synthetic pathways for drugs, toxicology and the analysis and chemistry associated with the components of fingermarks. The journal is particularly interested in receiving manuscripts that report advances in the forensic interpretation of chemical evidence. Technology Readiness Level: When submitting an article to Forensic Chemistry, all authors will be asked to self-assign a Technology Readiness Level (TRL) to their article. The purpose of the TRL system is to help readers understand the level of maturity of an idea or method, to help track the evolution of readiness of a given technique or method, and to help filter published articles by the expected ease of implementation in an operation setting within a crime lab.
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