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The advanced biomimetic mineralization technology was applied to protect the  Botulinum  neurotoxin type D, and the processing of the mineralization granule of botulinum toxin type D was successfully screened. The loss of activity of the toxin protein at different temperatures and the destructive strength of the gastrointestinal tract against the toxin were determined biologically. The lethal toxicity of the mineralized toxin to wild rodents was determined by median lethal dose. Protective tests at different temperatures showed that the preservation period of botulinum toxin type D mineralized sample 2 was significantly higher than that of the control group at three different temperatures, and its toxicity loss was significantly reduced. The damage intensity of the mineralized toxin to the gastrointestinal contents of plateau zokor and plateau pika was significantly reduced. The minimum lethal doses of the mineralized toxin particles to plateau zokor, plateau pika, and mice were 5200, 8,600,000, and 25,000 MLD/kg. These results showed that biomimetic mineralization could greatly improve the thermal stability of botulinum toxin type D and reduce the damaging effect of the gastrointestinal contents of target animals to botulinum toxin type D. The mineralized toxin could be used to control the population density of urban rodents. This research provides new insights into the protection of toxin protein substances.

New technology to improve the thermal stability of botulinum toxin type D by biomimetic mineralization