Spores love low oxygen, high temperature, and low acidity. A lot of conditions for canning food are also conditions in which spores would love to germinate. In theory, it is possible to get botulin into food, however, if you heat the food for long-enough to achieve theoretical 12-log reduction of botulin toxin (99.9999% reduction) through this process, it should be ok. Exact duration depends on food and the method of preparation.