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Updated: Jun 4, 2026

Isolation and Quantification of Botulinum Neurotoxin From Complex Matrices Using the BoTest Matrix Assays
Published on: March 3, 2014
Improved detection of botulinum neurotoxin type A in stool by mass spectrometry
Dongxia Wang1, Jakub Baudys, Suzanne R Kalb
1National Center for Environmental Health, Centers for Disease Control and Prevention, Atlanta, GA 30341, USA.
Abstract:
Botulinum neurotoxins (BoNTs) are the most toxic substances known to humankind. Rapid and sensitive detection of BoNTs is necessary for timely clinical confirmation of the disease state in botulism. BoNTs cleave proteins and peptide mimics at specific sites. A mass spectrometry (MS)-based method, Endopep-MS, can detect these cleavages and has detection limits of 0.05-0.5 mouse LD(50) (U) in serum, depending on the BoNT serotypes. In this method, the products generated from cleavage of peptide substrates using antibody affinity-purified toxins are detected by MS. Nonspecific bound endogenous proteases or peptidases in stool can coextract with the toxin, cleaving the peptide substrates and reducing the sensitivity of the method. Here we report a method to reduce nonspecific substrate cleavage by reducing stool protease coextraction in the Endopep-MS assay.
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