SIMS study of the processes in buffer solutions of bioorganic systems

Melnikov, V. N.; Litvinov, V. A.; Koppe, V. T.; Bobkov, V. V.

doi:10.3103/s1062873808070137

Cited by 2 publications

(1 citation statement)

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“…There is a variant of secondary ion mass spectrometry in which the substance investigated is placed in liquid (also called a liquid matrix) bombarded with accelerated ions or atoms (Cozzolino et al ., ; Melnikov et al ., ; Kosevich et al ., ). The main advantage of this technique is that it allows the study of reactions in bio‐organic systems at various intermediate stages rather than just at the very final stage (Melnikov et al ., ). Mass spectra of complex objects typically contain a large number of peaks representing secondary ions originating from the liquid matrix, but the mass spectrum of the liquid matrix itself is of little interest.…”

Section: Introductionmentioning

confidence: 97%

Finite Mixture Modelling in Mass Spectrometry Analysis

Melnykov

2013

Journal of the Royal Statistical Society Series C: Applied Statistics

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Secondary ion mass spectrometry is a popular physical technique that allows learning elemental and chemical compositions of various substances. In some cases, the mass spectrum of the sample studied is not observable without that of the liquid solution in which the investigated substance must be placed. To separate the informative part of the observed mixed spectrum from the irrelevant liquid solution part, we develop an approach that is based on finite mixtures. Finite mixture modelling is a statistical technique that is capable of accounting for various shapes and patterns in data. We discuss a mixture model constructed with bell-shaped discrete component distributions that can be employed in the mass spectrometry framework for extracting the informative part of the mixed spectrum of organic objects. The results for assessing variability in the mass spectrum extracted are derived. The procedure is thoroughly illustrated on simulated data sets and applied to several real life problems that are concerned with complex organic dyes placed in a glycerol liquid matrix. The results obtained have clear chemical interpretation and suggest that the approach proposed is very promising.

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Section: Introductionmentioning

confidence: 97%