AbstractThe Staphyloccus epidermidis,pseudomonas aeruginosa,Staphylococcus aureus,Escherichi时 acoli,and Candida al bicans were selected as tested micrcorganisms. According to doubling dilutionrule,the chitosan solution of different dosage was added in the culture solution and kept at 37℃constant tcmporature for 18 hours. The smallest bacteriortatic concentration of the chitosan solutionwas 0.016%for Saphylococcus aureus,0.008%for Staphylococcus epidermidis, 0.032%forEscherichia coli,0...