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NCJRS Abstract

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NCJ Number: 136860 Find in a Library
Title: 5-Methylthio Ninhydrin and Related Compounds: A Novel Class of Fluorogenic Fingerprint Reagents
Journal: Journal of Forensic Sciences  Volume:37  Issue:3  Dated:(May 1992)  Pages:688-694
Author(s): J Almog; A Hirshfeld; A Frank; H Grant; Z Harel; Y Ittah
Date Published: 1992
Page Count: 7
Type: Report (Technical)
Format: Article
Language: English
Country: United States of America
Annotation: This study demonstrated that ninhydrin derivatives bearing sulfur-containing groups at position 5 have excellent properties as fluorogenic fingerprint reagents on paper.
Abstract: Ninhydrin derives bearing alkylthio substituents at position 5 were prepared from their corresponding 6-thionindanones by oxidation with N-bromosuccinimide and dimethylsulfoxide. Absorption spectra in solution were recorded on an ultraviolet spectrophotometer, and two light sources were used for luminescence excitation. Latent fingerprint samples of various individuals were collected on four types of paper items: groundwood-free white paper, checks, Israeli bank notes, and $1 U.S. bills. It was found that all 5-thioninhydrins reacted with alanine to give colored products. All developed latent fingerprints on paper to give images similar to those obtained with ninhydrin. Their sensitivity markedly exceed that of ninhydrin and even that of 5-methoxy ninhydrin. Alkylthio ninhydrins, as fluorogenic fingerprint reagents, were characterized by the following properties: both colored and fluorescent images, intense fluorescent images, wide range of excitation, minimal background discoloration, convenient application, and enhanced fluorescence upon cooling to liquid nitrogen temperature. 15 references, 1 table, and 3 figures (Author abstract modified)
Main Term(s): Fingerprint image quality
Index Term(s): Criminal investigation; Forensic sciences
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