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Developing Fluorogenic Reagents for Detecting and Enhancing Bloody Fingerprints

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Developing Fluorogenic Reagents for Detecting and Enhancing Bloody Fingerprints The author(s) shown below used Federal funds provided by the U.S. Department of Justice and prepared the following final report: Document Title: Developing Fluorogenic Reagents for Detecting and Enhancing Bloody Fingerprints Author: Robert M. Strongin, Dr.Martha Sibrian-Vazquez Document No.: 227841 Date Received: August 2009 Award Number: 2007-DN-BX-K171 This report has not been published by the U.S. Department of Justice. To provide better customer service, NCJRS has made this Federally- funded grant final report available electronically in addition to traditional paper copies. Opinions or points of view expressed are those of the author(s) and do not necessarily reflect the official position or policies of the U.S. Department of Justice. Developing Fluorogenic Reagents for Detecting and Enhancing Bloody Fingerprints Award 2007-DN-BX-K171 Authors Prof. Robert M. Strongin Dr.Martha Sibrian-Vazquez 1 This document is a research report submitted to the U.S. Department of Justice. This report has not been published by the Department. Opinions or points of view expressed are those of the author(s) and do not necessarily reflect the official position or policies of the U.S. Department of Justice. Abstract Fingerprints are the most common and useful physical evidence for the apprehension and conviction of crime perpetrators. Fluorogenic reagents for detecting and enhancing fingerprints in blood, however, have several associated challenges. For instance, they are generally unsuitable for dark and multi-colored substrates. Luminol and fluorescin and other chemilumigens and fluorigens can be used with dark and often multi-colored substrates, but are not compatible with fixatives and their oxidation products are not insoluble. They therefore diffuse away, degrading detail. The oxidation of luminol is a fast and irreversible reaction, so the user must act quickly to observe and capture an image or it will be lost. The chemiluminescence of luminol and the fluorescence of fluorescein and other standard fluorophores are quenched in acidic media. The main goal of the proposed Phase 1 research was to develop fluorogenic compounds for detecting fingerprints in blood that have suitable sensitivity and stability, enhance and preserve print details, and will work on dark and multi-colored substrates. Reagents and protocols were developed that preserved detail for substantially longer periods than fluorescein. Solubility and fluorescence under acidic conditions and peroxidase-specific chemistry were all successfully achieved. The proposed materials thus improved upon the current fluorescin/fluorescein and luminol systems in many respects. 2 This document is a research report submitted to the U.S. Department of Justice. This report has not been published by the Department. Opinions or points of view expressed are those of the author(s) and do not necessarily reflect the official position or policies of the U.S. Department of Justice. Table of Contents Executive Summary I. Introduction II. Methods III. Results III.1 Screening of NBD- and Benzidine-Basic Dyes-HP reaction III.2. Synthesis of SNAFR2 analogues III. 3 Reduction of SNAFR2 analogues III.4 Reaction of Reduced SNAFR with Peroxidase III.4.1 Reaction of Reduced SNAFRs with Peroxidase, UV-Vis III.4.2 Reaction of Reduced SNAFRs with Peroxidase, Fluorescence III.5 Screening of oxidation reaction of reduced compound 22 mediated by HP/H2O2 or Pig Blood/H2O2 at acidic pH. III.6 Reaction of reduced compound 22 with HP and blood pig monitored by fluorescence. III.7 Synthesis of SNAFR-6 analogues III.8 Reduction of SNAFR-6 analogues III.9 Screening of reduced SNAFR analogues reaction with Pig Blood/H2O2 in sulfosalicylic acid solution III.11 Screening of SNAFR analogues fluorescence in surfaces (Filter paper) III.12 Sensitivity of SNAFRs on Filter Paper III.13 Blood fingerprint development on surfaces (glass and paper) III.13.1 Blood fingerprint development on glass surfaces III.13.2 Blood fingerprint development on paper surfaces III.14 Procedure for blood fingerprint development using SNAFR analogues IV. Conclusions V. References Appendix I. UV-vis and Fluorescence spectra for NBD- and Benzidine-Basic Dyes-HP reaction. Appendx II. Fluorescence spectra for the reaction of educed SNAFRs with Peroxidase. Appendx III. 1H NMR, 13C NMR, and MS of selected compounds. 3 This document is a research report submitted to the U.S. Department of Justice. This report has not been published by the Department. Opinions or points of view expressed are those of the author(s) and do not necessarily reflect the official position or policies of the U.S. Department of Justice. Executive Summary 1. Problem and Purpose. Fingerprints are the most common and useful physical evidence for the apprehension and conviction of crime perpetrators. Fingerprints, foot and shoe prints in blood are especially informative for crime scene reconstruction and prosecution of defendants because they are made at or about the time of the crime’s being committed. Although numerous reagents have been developed for detecting and enhancing latent prints on a variety of substrates, limitations remain: (i) most are unsuitable for dark and multi-colored substrates, (ii) the visualizable oxidation products of reagents such as luminol and fluorescein are not insoluble enough to prevent unwanted diffusion resulting in degradation of detail, (iii) the oxidation of luminol is a fast and irreversible reaction, so the user must act quickly to observe and capture an image or it will be lost and (iv) the chemiluminescence of luminol and the fluorescence of fluorescein is quenched in acidic fixing media. Beyond the Phase 1 goals of the project described herein are the longer term issues involving the creation fluorogenic compounds and solutions for prints in blood that: (i) exhibit high sensitivity and stability, (ii) are practical for use with large, variable surface types, (iii) will enhance and preserve print details, (iv) will work on dark and multi-colored substrates, (v) would allow for subsequent DNA typing, and (vi) are relatively safe for users. The Table on the following page summarizes each of the most commonly used fingerprint reagents and the issues encountered with their usage: 4 This document is a research report submitted to the U.S. Department of Justice. This report has not been published by the Department. Opinions or points of view expressed are those of the author(s) and do not necessarily reflect the official position or policies of the U.S. Department of Justice. Table 1. Common print reagents Compound Use Type of Color after Formula Documentation Shelf life stain development Amido black Latent prints and Protein Dark Blue HOAc/MeOH or --- Indef. Alcohol or water base to enhance visible Citric Acid/Kodak Naphthol blue black blood prints on Photo Flo 600 painted surfaces solution Diaminobenzidine Latent prints and Catalytic Brown Sulfosalicylic In the presence of light 24 h at rt, (DAB) to enhance visible Oxid. acid/H2O2 background 48 h if blood prints development occurs due refrig. to dye photoionization ABTS Latent prints and Catalytic Bright green Water/H2O2 Fading of detail may 48h refrig. to enhance visible Oxid. occur within 2 weeks. blood prints DFO (1,8­ Latent prints on Protein Yellow MeOH/EtOAc/HO Treated porous items 6 months diazafluoren-9-one) porous surfaces fluorescence and Ac may become stained w/ red-pink ridge a yellow discoloration detail after some time Ninhydrin Latent prints on Protein Purple Acetone Spraying, dipping or 1 year porous surfaces MeOH/IsoprOH painting Petroleum ether 75-80% relative humidity is needed Comassie brilliant blue Latent prints and Protein Blue. HOAc/MeOH --- Indef. R to enhance visible (acid blue 83) blood prints Crowle’s double stain Latent prints and Protein Blue HOAc/TCAA ---- Indef. to enhance visible blood prints Leucocrystal violet Latent prints, Catalytic Purple Sulfosaliccylic In the presence of light 30 days (LCV) deposited blood on Oxid. acid background non-porous H2O2 development occurs due surfaces, visible to dye photoionization blood prints Fluorescein Reagent for latent Catalytic Green EtOH/HOAc/ Photographs should be Up to 24h, bloodstains Oxid. fluorescence H2O2 taken within a few hours recomm. Water/ H2O2 to prep and use fresh Luminol Reagent for latent Catalytic Blue glow Water/ H2O2, Photographs should be Solution bloodstains Oxid. KOH taken immediately has to be prepared and used asap Summary: 1. Amido black and ninhydrin form dark-colored dye complexes and have been used successfully on light colored transparent surfaces. They are not typically used on dark colored surfaces. Ninhydrin has a low background color but is unsuitable for porous surfaces since it runs off, and either distorts the print or fails to react before detail can be photographed. Amido black is very sensitive and works well on non-porous surfaces but its high background color (light to medium blue) compromises contrast on porous surfaces from which the stain can not be removed by rinsing. 2. DFO (1,8-diazafluoren-9-one) is a very sensitive dye that gives yellow fluorescence, but its use is limited, since for development the specimen has to be heated at 100 oC. Treated porous items may become tainted with a yellow discoloration after time. 3. Luminol has had limited success since there is only briefly appearing luminescence. It is thus hard to photograph and fails to resolve fine ridge detail. 5 This document is a research report submitted to the U.S. Department of Justice. This report has not been published by the Department. Opinions or points of view expressed are those of the author(s) and do not necessarily reflect the official position or policies of the U.S. Department of Justice. 4. Leucocrystal violet (LCV) is used to develop prints mainly on light-colored backgrounds. Background development however can occur under intense light due to photoionization products of the dye which may react with other substances not specific to blood.
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