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Viscosity of the oil phase at room temperature (23.4 °C) as a function of (A) the PLGA concentration (red dashed line, PLGA MW of 148 kDa), and PLGA MW (green solid line, PLGA concentration of 16.85%) after stirring for one hour. Effect of PLGA/naltrexone contact time with the organic solvents on the viscosity (B and C). All of the viscosity values were reported as mean ± standard deviation. Some of the standard deviations were smaller than the size of the symbols.
