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Polyacryloylcephalexine and polymethacryloylcephalexine were prepared by the reaction of polyacryloylchloride or polymethacryloyl chloride with cephalexine. The antimicrobial activities of these polymeric drugs were investigated by the common twofold dilution technique and the minimum inhibitory concentration (MIC) of polymeric durgs was also examined. Polyacryloylcephalexine revealed an excellent antibacterial activity against Micrococcus luteus ATCC 9341, Escherichia coli ESS, Bacillus subtilis ATCC 6633, Staphylococcus aureus ATCC 25923, Mycobacterium phlei IFO 3158, Klebsiella pueumouiae KCTC 1560, Escherichia coli KCTC 1039, Salmonella typhimurium KCTC 1925. Polymethacryloylcephalexine revealed an excellent antibacterial activity against Micrococcus luteus ATCC 9341, Klebsiella pueumouiae KCTC 1560, Bacillus subtilis ATCC 6633, Staphylococcus aureus ATCC 25923, Mycobacterium phlei IFO 3158, Escherichia coli KCTC 1039, Escherichia coli ESS, Salmonella typhimurium KCTC 1925.
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