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Characterization of the lower-molecular-mass fraction of venoms from Dendroaspis jamesoni kaimosae and Micrurus fulvius using capillary-electrophoresis electrospray mass spectrometry.

Capillary electrophoresis (CE) with electrospray ionization (ESI) and selected ion-monitoring mass-spectrometric (SIM-MS) detection has been used to provide as much information as possible about the lower molecular-mass fraction (peptides of molecular masses up to 8500 Da) of the venoms of Dendroaspis jamesoni kaimosae (Jameson's Mamba) and Micrurus fulvius (Eastern Coral Snake). Method development was based on the venom of D. jamesoni kaimosae, which contains some previously described peptides, with subsequent application to the completely unknown venom of M. fulvius. CE-ESI-SIM-MS provides a rapid and extremely sensitive method for the detection and molecular-mass determination of peptides present in venoms. It has been utilized to provide molecular masses and thus, by inference, confirmation of the peptide compositions for those toxins which have been previously described in the literature. Our methodology indicates the presence of 83 peptides in the venom of D. jamesoni kaimosae and 49 peptides in the venom of M. fulvius in the molecular-mass range 6000-8500 Da.