How long and at what temperature ?
Dunno in food - perhaps someone with experience in that field might chime in. The toxins (there are six serotypes) in the laboratory are "relatively heat-labile requiring about 10 min at 100 degrees C for inactivation." (Walden and Kluge, p. 761) Ten minutes of boiling? I'll have to defer that one...
256 degrees and 28 psi for 15 minutes