Article2010

Age Estimation by Racemization Method in Teeth: Application of Aspartic Acid, Glutamate, and Alanine

27 citations0/0 files storedJournal of Forensic Sciences

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Forensic Anthropology and Bioarchaeology Studies Archaeology and ancient environmental studies Forensic Entomology and Diptera Studies

Abstract

Here, we report on an experimental approach of simultaneous determination of various amino acids racemization (AAR) rates in teeth. We evaluated the measurements of aspartic acid (Asp), glutamate (Glu), and alanine (Ala) isolated from dentin. Asx D/L rates from total amino acid fraction, generally used for age estimation, showed high correlation (r = 0.98) with age. As Glx and Ala showed very slow racemization kinetics in TA, we performed further analysis of the acid-soluble protein (SP) fraction. The results supported improved correlation between age and D/L rates for Glu (r = 0.84) and Ala (r = 0.85), as well as for Asp (r = 0.98). By providing further elucidation on dentin protein racemization, the technique offers a considerable opportunity to involve other amino acids in age estimation studies. As the process does not require additional separation steps, the method can be easily adapted to existing protocols.

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References

2000Age estimation: The state of the art in relation to the specific demands of forensic practise 1975Aspartic acid racemization in tooth enamel from living humans.1991Age Estimation Using the Racemization of Amino Acid in Human Dentin 1993Postmortem estimation of age at death based on aspartic acid racemization in dentin: Its applicability for root dentin 2008Degradation of biomolecules in artificially and naturally aged teeth: Implications for age estimation based on aspartic acid racemization and DNA analysis 1995Estimation of Age from the Teeth of Unidentified Corpses Using the Amino Acid Racemization Method with Reference to Actual Cases 1990The extent of aspartic acid racemization in dentin: a possible method for a more accurate determination of age at death?2005Analysis of Fiber Dyes By Liquid Chromatography Mass Spectrometry (LC-MS) with Electrospray Ionization: Discriminating Between Dyes with Indistinguishable UV-Visible Absorption Spectra

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2014Age Estimation from Pulp/Tooth Area Ratio in Three Mandibular Teeth by Panoramic Radiographs: Study of an Egyptian Sample 2014Racemization of aspartic acid in root dentin as a tool for age estimation in a Kuwaiti population 2016Aspartic acid racemization in dentin of the third molar for age estimation of the Chaoshan population in South China

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