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The aloe vera-derived DRP used for these studies is a complex of polysaccharides with average molecular mass of ~4 ¡Á 106 Da (9). To prepare the DRP, mucilage was obtained by gentle extraction from fresh leaves of aloe vera plant. Purification of the DRP was performed using standard methods of precipitation with 100% ethanol and further dissolving the precipitate in saline containing 0.25 mg/mL of gentamicin (GentaMaxTM 100, Phoenix, St. Joseph, MO). The preparation was dialyzed against saline with 0.25 mg/mL of gentamicin for 48 h using a dialysis membrane with a 50,000-Da molecular mass cutoff (Spectra/Por membrane, MWCO:50,000, Spectrum Laboratories, Rancho Dominguez, CA). Size-exclusion chromatography (GPC-Triple Detector, Viscotek, Houston, TX) and hydrodynamic and rheological characterizations were used to assure the polymer¡¯s physicochemical properties. Before each experiment, the polymer was dissolved in pyrogen-free sterile normal saline solution (50 ¦Ìg/mL). The final solution (DRP) contained 0.05 mg/mL of gentamicin. The control solution (NS) consisted of normal saline containing the same concentration of gentamicin.

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