I need to add DAP in a medium and I need to know its possible sterilization and preparation methods
You should filter-sterilize it. Please see the preparation instructions in the attached link.
https://books.google.de/books?id=NpbLBQAAQBAJ&pg=PA911&lpg=PA911&dq=prepare+sterile+diaminopimelic+acid&source=bl&ots=QAh1xUUswJ&sig=R_xFJNkCljtRJOaV5M7z4YPGFfg&hl=en&sa=X&ved=0ahUKEwjU-8iU8rDWAhVeGsAKHfSyBo0Q6AEIKDAA#v=onepage&q=prepare%20sterile%20diaminopimelic%20acid&f=false
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