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A new method for detection of tetrodotoxin (TTX) by thin-layer chromatography/fast atom bombardment (FAB) mass spectrometry was developed. TTX and/or related substances were separated by TLC on LHP-K high-performance precoated plates, with a solvent system of pyridine:ethyl acetate:acetic acid:water (15:5:3:4). The plates were subjected to positive FAB mass spectrometry, under scanning within a mass range from m/z 100 to 500. TTX was identified by selected ion-monitored chromatograms at m/z 320 (M + H)+ and 302 (M + H - H2O)+, along with full scan positive ion FAB mass spectrometry. The limit of detection for TTX was about 0.1 micrograms. TTX was also detected by cellulose acetate membrane electrophoresis/FAB mass spectrometry.
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