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Effect of water-soluble chitosan derivative (GN70-3) at the concentration of 250 mg/L on glucose concentration (○ and ●), lactate dehydrogenase activity (□ and ■) and protein level (▽and ▼) in the extracellular media of S. aureus cultured in deionized water at 37 °C up to 12 h. Open symbols (○, ▽, □) indicates cells without chitosan treatment, while solid symbols (●, ▼, ■) indicated cells with chitosan treatment. Each value is expressed as mean ± SD (n = 3).
