Limits for the detection of (poly-)phosphoinositides by matrix-assisted laser desorption and ionization time-of-flight mass spectrometry (MALDI-TOF MS)
| Autor: | Wolf Oehrl, Marijana Petković, Jürgen Arnhold, Regina Heinze, Reinhard Wetzker, Matthias M. Müller, Klaus Arnold, Jürgen Schiller |
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| Rok vydání: | 2001 |
| Předmět: |
Detection limit
Analyte Chromatography Molecular mass Organic Chemistry Analytical chemistry Cell Biology Mass spectrometry Biochemistry Sensitivity and Specificity Matrix (chemical analysis) Matrix-assisted laser desorption/ionization chemistry.chemical_compound chemistry Phosphatidylinositol Phosphates Ionization Phosphatidylcholine Spectrometry Mass Matrix-Assisted Laser Desorption-Ionization Phosphorylation Molecular Biology |
| Zdroj: | Chemistry and physics of lipids. 110(2) |
| ISSN: | 0009-3084 |
| Popis: | Matrix-assisted laser desorption and ionization time-of-flight mass spectrometry (MALDI-TOF MS) has been recently established as a powerful tool for the analysis of biomolecules. Here, MALDI-TOF MS was used for the detection of (poly-)phosphoinositides (PPI). PPI possess higher molecular weights than other phospholipids and a high phosphorylation-dependent negative charge. Both features affect the MALDI detection limits expressed as the minimum of analyte on the sample plate resulting in a signal-to-noise-ratio of S/N = 5. Using 2,5-dihydroxybenzoic acid (DHB) as matrix the detection limit for phosphatidylinositol (PI) is seven times higher than for phosphatidylcholine (PC) and further increases with increasing phosphorylation or in mixtures with other well-detectable phospholipids. For phosphatidylinositol-tris-phosphate (PIP3) in a mixture with PC, the limit is about 20 times higher than for PI. The consequences for the experimental conditions are discussed. It is advisable to pre-separate PPI from biological lipid mixtures prior to the application of MALDI-TOF MS. |
| Databáze: | OpenAIRE |
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