Open AccessEstimation of the Postmortem Interval by Measuring Blood Oxidation-reduction Potential Values
Author(s) -
Zhuqing Jiang,
Ming You,
Xu Wang,
Di Lu,
Haidong Zhang,
Shengli Di,
Fengqin Zhang,
Guo Zhao-ming,
E Xiaofei,
Lin Chang,
Jian Xiang,
Rufeng Bai,
Tiantong Yang
Publication year - 2016
Publication title -
journal of forensic science and medicine
Language(s) - English
Resource type - Journals
eISSN - 2455-0094
pISSN - 2349-5014
DOI - 10.4103/2349-5014.155727
Subject(s) - interval (graph theory) , estimation , statistics , interval estimation , reduction (mathematics) , mathematics , confidence interval , engineering , combinatorics , geometry , systems engineering
Accurate estimation of the postmortem interval (PMI) is an important task in forensic practice. In the last half-century, the use of postmortem biochemistry has become an important ancillary method in determining the time of death. The present study was carried out to determine the correlation between blood oxidation-reduction potential (ORP) values and PMIs, and to develop a three-dimensional surface equation to estimate the PMI under various temperature conditions. A total of 48 rabbits were placed into six groups and sacrificed by air embolism. Blood was obtained from the right ventricle of each rabbit, and specimens were stored at 10°C, 15°C, 20°C, 25°C, 30°C, and 35°C. At different PMIs (once every 4 h), the blood ORP values were measured using a PB-21 electrochemical analyzer. Statistical analysis and curve fitting of the data yielded cubic polynomial regression equations and a surface equation at different temperatures. Result: The results showed that there was a strong positive correlation between the blood ORP values at different temperatures and the PMI. This study provides another example of using a three-dimensional surface equation as a tool to estimate the PMI at various temperature conditions