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Quantitative analysis of free fatty acids was achieved using matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI–TOF MS) with a meso-tetrakis porphyrin matrix. Cesium acetate was employed as a cationizing agent. The MALDI signal was reproducible and dominated by cesiated cesium carboxylates [RCOOCs+Cs] + . The addition of two Cs ions resulted in a mass shift...
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