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Analytical methods for alkyl polyglucosides. Part II: Qualitative determination using thin layer chormatography and identification by means of in-situ secondary ion mass spectrometry

This paper proposes a method for the separation of industrial APG mixtures by thin-layer chromatography (TLC) on RP 18 reversed-phase plates. The APGs are separated according to their different alkyl chain lengths. The substances are made visible as black spots on the TLC plate by spraying with diluted sulphuric acid and subsequent heating. The dectection limit is 600 ng. The separated substances can be identified by on-line coupling of TLC with secondary-ion mass spectrometry (SIMS). For this purpose a silver layer must be evaporated onto the TLC plate and the substances must be enriched on this layer, which can be done by moistening the spot with an appropriate solvent. The SIMS investigations showed that the alkylmonoglucosides were entirely separated whereas the APGs with a high degree of glucosidation (up to 12 glucose units) can be found in a broad range of R f -values. TLC-SIMS coupling proved to be suitable for the identification of unknown substances and determining the purity of the separated spots.