Detection of fingermarks by colloidal gold (MMD/SMD): beyond the pH 3 limit
Details
State: Public
Version: Author's accepted manuscript
Serval ID
serval:BIB_2B06F70FACDF
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
Detection of fingermarks by colloidal gold (MMD/SMD): beyond the pH 3 limit
Journal
Forensic Science International
ISSN
0379-0738
Publication state
Published
Issued date
06/2012
Peer-reviewed
Oui
Volume
219
Number
1-3
Pages
39-49
Language
english
Abstract
This work is part of a continuing goal to improve the multimetal deposition technique (MMD), as well as the single-metal deposition (SMD), to make them more robust, more user-friendly, and less labour-intensive. Indeed, two major limitations of the MMD/SMD were identified: (1) the synthesis of colloidal gold, which is quite labour-intensive, and (2) the sharp decrease in efficiency observed when the pH of the working solution is increased above pH 3. About the synthesis protocol, it has been simplified so that there is no more need to monitor the temperature during the synthesis. The efficiency has also been improved by adding aspartic acid, conjointly with sodium citrate, during the synthesis of colloidal gold. This extends the range of pH for which it is possible to detect fingermarks in the frame of the MMD/SMD. The operational range is now extended from 2 to 6.7, compared to 2-3 for the previous formulations. The increased robustness of the working solution may improve the ability of the technique to process substrates that tend to increase the pH of the solution after their immersion.
Keywords
Fingermark detection, Gold nanoparticle, Colloidal solution, Multimetal deposition, Single-metal deposition, Aspartic acid
Create date
27/06/2012 15:16
Last modification date
20/08/2019 14:10