Document Detail


The effect of zinc chloride, humidity and the substrate on the reaction of 1,2-indanedione-zinc with amino acids in latent fingermark secretions.
MedLine Citation:
PMID:  21726967     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
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).
Authors:
Xanthe Spindler; Ronald Shimmon; Claude Roux; Chris Lennard
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-7-2
Journal Detail:
Title:  Forensic science international     Volume:  -     ISSN:  1872-6283     ISO Abbreviation:  -     Publication Date:  2011 Jul 
Date Detail:
Created Date:  2011-7-5     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7902034     Medline TA:  Forensic Sci Int     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2011 Elsevier Ireland Ltd. All rights reserved.
Affiliation:
Centre for Forensic Science, University of Technology, Sydney, Ultimo, NSW, Australia; National Centre for Forensic Studies, University of Canberra, Canberra, ACT, Australia 2601.
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