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Purified Lophozozymus pictor toxin (LPTX) shares many properties similar to palytoxin (PTX). LPTX and palytoxin isolated from Palythoa caribaeorum (C-PTX) have similar mol. wts of approx. 2680 on ionspray mass spectrometry (MS). In addition, antibodies against PTX could recognize and bind LPTX. Mixed mode high-performance liquid chromatography (HPLC) of LPTX, C-PTX and H-PTX (isolated from Palythoa tuberculosa) showed a major PTX component common to all three with the characteristic PTX-like UV spectrum at a retention time (Rt) of 17 min. However, LPTX exhibits fluorescence but PTX of equivalent toxicity does not. LPTX showed a unique peak at Rt of approx. 22 min on mixed mode HPLC. In addition, LPTX and C-PTX showed different ion fragmentation patterns on MS/MS. These results suggest that LPTX and the palytoxins are structural isomers, containing at least one difference which gives rise to fluorescence in LPTX.
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