Department of Forensic Medicine, University of Malaga, Malaga, Spain.
Department of Forensic Medicine and Forensic Dentistry, University of Granada, Granada, Spain.
PLoS One. 2018 Apr 26;13(4):e0196305. doi: 10.1371/journal.pone.0196305. eCollection 2018.
Teeth exposed to thermal stress can shed light on the identification of incinerated individuals and on the circumstances of the fire. Changes in the color of burned teeth can provide information on structural changes and the temperature of exposure. The objective of this study was to correlate color modifications with the concentration of human DNA in teeth burned at different temperatures. Spectrophotometry was used to measure the color of 40 teeth heated at temperatures of 100, 200, and 400°C for 60 min. DNA was extracted by phenol-chloroform extraction and quantified by real-time quantitative PCR using the Quantifier human DNA quantification kit. Preliminary results indicated an association of higher temperature with changes in colorimetric variables and a decrease in DNA concentrations. A significant positive correlation was found between luminosity values and DNA concentration (r = 0.4727, p = 0.0128) and between chromaticity a* values and DNA concentration (r = 0.4154, p = 0.0250). Spectrophotometry analysis of the color of burned teeth may predict the feasibility of extracting human DNA for identification purposes.
暴露于热应激下的牙齿可以揭示焚烧个体的身份和火灾情况。烧伤牙齿颜色的变化可以提供关于结构变化和暴露温度的信息。本研究的目的是将颜色变化与在不同温度下燃烧的牙齿中的人类 DNA 浓度相关联。使用分光光度法测量在 100°C、200°C 和 400°C 下加热 60 分钟的 40 颗牙齿的颜色。通过酚-氯仿提取法提取 DNA,并使用 Quantifier 人类 DNA 定量试剂盒通过实时定量 PCR 进行定量。初步结果表明,较高的温度与比色变量的变化和 DNA 浓度的降低有关。发现亮度值与 DNA 浓度之间存在显著正相关(r = 0.4727,p = 0.0128),以及色度值 a*与 DNA 浓度之间存在显著正相关(r = 0.4154,p = 0.0250)。对烧伤牙齿颜色的分光光度分析可能可以预测用于识别目的的人类 DNA 提取的可行性。