Navigation Links
New strategy for fingerprint visualization developed at Hebrew University

Jerusalem, Nov. 6, 2012 -- Identifying fingerprints on paper is a commonly used method in police forensic work, but unfortunately it is not easy to make those fingerprints visible. Now, scientists at the Hebrew University of Jerusalem have developed a new approach for making such fingerprints more readily readable.

The new method, created by a team headed by Prof. Yossi Almog and Prof. Daniel Mandler of the Institute of Chemistry at the Hebrew University, uses an innovative chemical process to produce a negative of the fingerprint image rather than the positive image produced under current methods. Unlike the latter, the Hebrew University-developed process is nearly independent of the composition of the sweat residue left behind on the paper.

The new method is described in the current issue of the international, English-language edition of the journal Angewandte Chemie, published by the German Chemical Society.

In many criminal investigations, paper evidence plays an important role, and it is useful to know who has handled such documents as checks, paper currency, notes, etc. Studies have shown that less than half of the fingerprints on paper items can be made sufficiently visible to enable their identification. The main reason for this seems to be the highly variable composition of the sweat left behind on the paper.

The new procedure developed at the Hebrew University avoids these problems. It involves an inversion of an established method in which gold nanoparticles are first deposited onto the invisible fingerprints, followed by elemental silver, similar to the development of a black and white photograph.

In the conventional technique, the gold particles get stuck to the amino acid components of the sweat in the fingerprints, and then silver is deposited onto the gold. The result is quite often low-contrast impressions of the fingerprints. In the new method, the gold nanoparticles stick directly to the paper surface, but not the sweat. This technique utiliizes the sebum from the fingerprints as a medium to avoid this interference. (Sebum is an oily substance secreted by the sebaceous glands that helps prevent hair and skin from drying out.) Treatment with a developer containing silver then turns the areas with gold on them black, resulting in a clear, negative image of the fingerprint.

"Since our method relies only on the fatty components in the fingerprints, the sweaty aspects play no role in the imaging process," said Prof. Almog. This technique also promises to alleviate another problem, he said. "If paper has become wet, it has previously been difficult to detect fingerprints because the amino acids in the sweat, which are the primary substrate for current chemical enhancement reactions, are dissolved and washed away by water, whereas the fatty components are barely affected." Thus, the avoidance of the sweat aspect provides a further enhancement for police laboratory investigation, he observed.


Contact: Jerry Barach
The Hebrew University of Jerusalem

Related biology technology :

1. Creabilis Receives Prestigious Technology Strategy Board Biomedical Catalyst Award
2. Elsevier / MEDai Names Dr. Peter Edelstein as Chief Medical Officer and Dr. Gerald Osband as Director of Product Strategy
3. ASAE, TMG Custom Media Collaborate to Launch New Print-Plus-Digital Strategy for Associations Now Magazine
4. Womens Health Expert GC-Rise Ties up with Georgetown MBA Team to Tap M&A Potential and Growth Strategy
5. New gene therapy strategy boosts levels of deficient protein in Friedreichs ataxia
6. Synteract Unveils New Branding at DIA 2012 to Support Enhanced Commercial Strategy
7. Meaningful Use Stage Two: The Advisory Board Company Helps Hospitals Set Strategy
8. SPO Updates Shareholders on 2012 Corporate Strategy
9. Generex Subsidiary Antigen Express Provides Update on AE37 Cancer Vaccines Clinical & Regulatory Strategy
10. Amgen and FDA Agree to Modify Nplate® (Romiplostim) Risk Evaluation and Mitigation Strategy
11. WaferGen Reports Third Quarter 2011 Financial Results and Announces New Commercialization Strategy
Post Your Comments:
Related Image:
New strategy for fingerprint visualization developed at Hebrew University
(Date:11/30/2015)... - Zenith Epigenetics Corp. ("Zenith" or the "Company") today announced ... to its Board of Directors to replace Dr. Peter ... of experience as co-founder of Resverlogix, with expertise in the ... --> Dr. Wong remarked, "I am very ... long standing expertise in epigenetics and the advanced stage of ...
(Date:11/30/2015)... 30, 2015  Champions Oncology, Inc. (CSBR), engaged in ... personalize the development and use of oncology drugs, today ... will be presenting at the LD MICRO Investor Conference ... Time (PST).  The conference, held at the Luxe Sunset ... , will feature 200 small/micro-cap companies and is ...
(Date:11/30/2015)... 2015  HUYA Bioscience International, the leader in accelerating ... innovations, today announced it has signed a Memorandum of ... foster collaboration between KDDF and HUYA with the ultimate ... products for the global market. ... new innovative preclinical and clinical stage compounds. The company ...
(Date:11/30/2015)... and MAGDEBURG, Germany , November 30, ... (ECNR) in Vienna, Austria to ... Congress of NeuroRehabilitation (ECNR) in Vienna, Austria ... NovaVision, a wholly owned subsidiary of Vycor Medical, Inc. ... of its Internet-delivered NovaVision Therapy Suite at the 3rd ...
Breaking Biology Technology:
(Date:10/29/2015)... , Oct. 29, 2015  Rubicon Genomics, Inc., ... U.S. distribution of its DNA library preparation products, ... Rubicon,s new ThruPLEX Plasma-seq kit. ThruPLEX Plasma-seq has ... preparation of NGS libraries for liquid biopsies--the analysis ... and prognostic applications in cancer and other conditions. ...
(Date:10/29/2015)... NXTD ) ("NXT-ID" or ... the growing mobile commerce market and creator of ... leading marketplace to discover and buy innovative technology ... on StackSocial for this holiday season.   ... a biometric authentication company focused on the growing ...
(Date:10/27/2015)... , Oct. 27, 2015 In the ... issues of concern for various industry verticals such as ... due to the growing demand for secure & simplified ... various ,sectors, such as hacking of bank accounts, misuse ... electronic equipment such as PC,s, laptops, and smartphones are ...
Breaking Biology News(10 mins):