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Comparison of methods used to extract marine toxins tetrodotoxin (TTX), saxitoxin (STX), and neosaxitoxin (NEO): A) All analytes extracted from urine matrix using Oasis MCX online SPE cartridge and Halo Penta-HILIC LC column. B) All analytes extracted from urine matrix using Oasis WCX online SPE cartridge and Atlantis Silica HILIC LC column.
