190 research outputs found
Variation in amino acid and lipid composition of latent fingerprints
The enhancement of latent fingerprints, both at the crime scene and in the laboratory using an array of chemical, physical and optical techniques, permits their use for identification. Despite the plethora of techniques available, there are occasions when latent fingerprints are not successfully enhanced. An understanding of latent fingerprint chemistry and behaviour will aid the improvement of current techniques and the development of novel ones. In this study the amino acid and fatty acid content of ârealâ latent fingerprints collected on a non-porous surface was analysed by gas chromatographyâmass
spectrometry. Squalene was also quantified in addition. Hexadecanoic acid, octadecanoic acid and cis-9-
octadecenoic acid were the most abundant fatty acids in all samples. There was, however, wide variation in the relative amounts of each fatty acid in each sample. It was clearly demonstrated that touching sebum-rich areas of the face immediately prior to fingerprint deposition resulted in a significant increase in the amount of fatty acids and squalene deposited in the resulting âgroomedâ fingerprints. Serine was the most abundant amino acid identified followed by glycine, alanine and aspartic acid. The significant
quantitative differences between the ânaturalâ and âgroomedâ fingerprint samples seen for fatty acids
were not observed in the case of the amino acids. This study demonstrates the variation in latent fingerprint composition between individuals and the impact of the sampling protocol on the quantitative analysis of fingerprints
A new formulation to estimate the variance of model prediction. Application to near infrared spectroscopy calibration
Simultaneous Sample Preparation Method for Determination of 3-Monochloropropane-1,2-Diol and Polycyclic Aromatic Hydrocarbons in Different Foodstuffs
Isotope dilution mass spectrometry for absolute quantification in proteomics: Concepts and strategies
Experimental methods of evaluating measurement uncertainty resulting from sample collection and preparation for analysis in chemical laboratories / NiepewnoĆÄ pomiaru wynikajÄ ca z poboru i przygotowania prĂłbek do badaĆ w laboratorium chemicznym oszacowana metodÄ doĆwiadczalnÄ
Accreditation for laboratories performing microbiological testing
SIGLEAvailable from British Library Document Supply Centre-DSC:q97/23754 / BLDSC - British Library Document Supply Centre1. ed.GBUnited Kingdo
Analytical Methods for Quantification and Identification of Intact Glucosinolates in Arabidopsis Roots Using LC-QqQ(LIT)-MS/MS
Quantification of azoxystrobin and identification of two novel metabolites in lettuce via liquid chromatographyâquadrupole-linear ion trap (QTRAP) mass spectrometry
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