Fingerprinting capabilities

Separation and positive identification of unknown components (fingerprinting capability)... 

It is known that the molecular structure of silane films is dependent on the deposition conditions [ 15]. Therefore, it is one of our objectives to demonstrate that changes in these conditions can be detected qualitatively in the SIMS spectra and that films of the same silane but deposited on different substrates may have different structures, as has been reported [16,17]. Another objective of this study is to demonstrate that the fingerprinting capability of SIMS can be used to distinguish between different silanes. 

Fingerprint capability Molecular information Quantitation Automation capability... 

J. J. Laserna. Combining fingerprinting capability with trace analytical detection surface-enhanced Raman spectrometry, Anal. Chim. Acta, 283, 607, 1993. 

In the last paragraph of Section 12.8.2, we saw in the case of xylene isomers that even the great compound fingerprinting capability of full scan MS detection could not distinguish... 

Many digital spectral libraries have been transformed from printed spectra collections. Well known printed collections are the Aldrich spectra collection [1], the Sadder spectra collection [2-4], the Schrader-Meyer Adas of IR and Raman spectra [5], the Hummel collection of IR spectra of polymers [6], the Merck IR Adas [7] and the Buback collection of NIR spectra [8]. IR spectra have the largest share of digital optical spectra, followed at a clear distance by Raman spectra. Larger collections of UV/VIS spectra have not been estabhshed due to their missing fingerprint capability and to the strong sensitivity of the UV/VIS spectra to solvent interactions. A variety of dedicated spectra collections have been created in industrial laboratories without access to the public. 

Even with this simplified instrument, PTR-MS/GC-MS systems are still not in regular use, possibly because the real advantage of PTR-MS in the Food Sciences is not necessarily in the identification of the VOCs but in its real-time rapid monitoring and fingerprinting capabilities. The latter s capability can be used for fast classification of foods (e.g. geographical origin) or for determining food quality and this is the subject of the next section. 

TRXF was used to determine the trace elements in samples of lecithin, insulin, procaine, and tryptophan in an attempt to develop elemental fingerprints that could be used to determine the origin of the sample [80]. It was reported that through the use of matrix-independent sample preparation and an internal standard, one could use TXRF to facilitate characterization of the samples without the need for extensive pretreatment. In another work, a study was made of the capability of TXRF for the determination of trace elements in pharmaceutical substances with and without preconcentration [81]. 

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