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The effect of zinc chloride, humidity and the substrate on the reaction of 1,2-indanedione-zinc with amino acids in latent fingermark secretions.
- Source :
-
Forensic science international [Forensic Sci Int] 2011 Oct 10; Vol. 212 (1-3), pp. 150-7. Date of Electronic Publication: 2011 Jul 02. - Publication Year :
- 2011
-
Abstract
- Anecdotal evidence from forensic practitioners and studies conducted under controlled conditions have indicated that the reaction between 1,2-indanedione and the amino acids present in latent fingermark deposits is highly susceptible to ambient humidity. The addition of catalytic amounts of zinc chloride to the 1,2-indanedione working solution--usually in the order of 1:25 to 1:4 molar ratio (indanedione:zinc)--significantly improves the colour and luminescence of fingermarks treated under dry conditions but appears to have a negligible effect on fingermarks treated in humid environments. The results presented in this paper confirmed that zinc(II) ions added to the 1,2-indanedione working solution act as a Lewis acid catalyst, stabilising a key intermediate during a rate-limiting hydrolysis step. Furthermore, studying the reaction using a chromatography-grade cellulose substrate method previously reported confirmed that cellulose substrates play a major role in facilitating the indanedione-amino acid reaction by acting as a surface catalyst in the early stages of the reaction and by directing the formation of the desired luminescent product (Joullié's Pink).<br /> (Copyright © 2011 Elsevier Ireland Ltd. All rights reserved.)
- Subjects :
- Amino Acids analysis
Chlorides analysis
Forensic Medicine methods
Humans
Humidity adverse effects
Indans analysis
Indicators and Reagents chemistry
Luminescent Measurements
Molecular Structure
Sensitivity and Specificity
Structure-Activity Relationship
Surface Properties
Zinc Compounds analysis
Amino Acids chemistry
Chlorides chemistry
Dermatoglyphics
Indans chemistry
Zinc Compounds chemistry
Subjects
Details
- Language :
- English
- ISSN :
- 1872-6283
- Volume :
- 212
- Issue :
- 1-3
- Database :
- MEDLINE
- Journal :
- Forensic science international
- Publication Type :
- Academic Journal
- Accession number :
- 21726967
- Full Text :
- https://doi.org/10.1016/j.forsciint.2011.06.005