Assertion: botulinum toxin | /r/HasAspect | a purity of 98% or higher
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Source sentences:
text: Accordingly, the present inventors have made extensive efforts to solve the above-described problems occurring in the prior art, and as a result, have found that when a culture of a botulinum toxin-producing strain is treated with acid to form a botulinum toxin precipitate and the formed precipitate is purified by anion exchange chro-matography, the steps of filtration, dialysis and ethanol precipitation can be omitted, and the process for production of the botulinum toxin is very easy, and a botulinum toxin having a purity of 98% or higher can be produced by this production method, thereby completing the present invention.