Sterilisation Of Bupivacaine

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Hello, I am in search of information on the stability of the bupivacaine sterilized with the gamma rays.Do you know if this product is stable with the gamma rays? Does there exist a degradation of the molecular chains when the bupivacaine is irradiated?This information will be useful for me for toxicological studies. Do you know where I will be able to obtain bibliographical data on this subject? thank you