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Journal of Industrial and Engineering Chemistry, Vol.13, No.6, 1043-1046, November, 2007
Preparation of Biodegradable PLGA Nanospheres Employing a Fast Solvent Evaporation Method
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The traditional W1/O/W2 emulsion method has a limit on the control of particle size to a nano-scale with high drug encapsulation efficiency (EE%). In the present study, we modified the solvent removal time and rate to develop an oral peptide drug delivery system using sCT as a model drug. We monitored the effect of the type of poly (vinyl alcohol) (PVA) within the W2 phase on the EE%. SEM images and particle size measurements revealed that the outer surfaces of representative nanosphere samples were very fine and even; the particle size was 383.2 ± 8.7 nm with a narrow size distribution (polydispersity index = 0.25 ± 0.004). The EE% increased depending on the solvent removal time and rate from 11.4 ± 1.3 to 28.8 ± 3.0 and 52.5 ± 6.5, compared to control nanospheres, respectively. The EE% of sCT was also enhanced by controlling the molecular weight of PVA within the W2 phase.
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