Lyophilized powder, protein 90 %, 40,000 units/mg protein, Synonym: Mucopeptide N-acetylmuramoylhydrolase, Muramidase. Lysozyme from chicken egg white has been used for the extraction of genomic DNA from bacterial cells. It has been used as an external standard for MALDI-TOF (matrix assisted laser desorption ionization-time of flight) mass analysis.