Authors: de Moraes Namur, Jocimara Ambrósio; de Magalhães Cabral-Albuquerque, Elaine Christine; Quintilio, Wagner; Santana, Maria Helena Andrade; Politi, Mario José; de Araujo, Pedro Soares; Lopes, Antônio Carlos; da Costa, Maria Helena Bueno

Source: Journal of Nanoscience and Nanotechnology, Volume 6, Number 8, August 2006 , pp. 2403-2407(5)

Publisher: American Scientific Publishers

Abstract:

Microsphere size is a primary determinant of solute release velocity. We present here a rational way for producing PLGA microspheres with different and controlled sizes. The following process variables were studied: Stirring velocity during the second emulsion step, dispersed and continuous phases volume ratio, and poly(vinyl alcohol) concentration in the continuous phase. A full factorial experimental design 2³ with triplicate at the central point was used to determine the influence of variables on PLGA microsphere mean size. The stirring velocity and poly(vinyl alcohol) concentration were the main variables at 0.95 significance level. An influence of PVA and stirring velocity on microspheres size is observed, there is no correlation for DP/CP volume ratio on size of microspheres. By combining the two variables—the stirring velocity and poly(vinyl alcohol) concentration, the surface response was analyzed. The increase of poly(vinyl alcohol) concentration with concomitant increase on stirring velocity produced microspheres with the lower sized. In contrast the lower poly(vinyl alcohol) concentration and the lower stirring velocity used produced the higher microspheres sized. Uniformly spherical and smooth microspheres (4-15 μm of diameter) were obtained. No significant difference was observed on Ponca Sloading within the experimental region. Our results open the possibility of formulating PLGA microspheres with custom sizes performing a minimum of experiments as required for specific applications.

Keywords: MICROPARTICLE SIZE DESIGN; ANTIGEN DELIVERY SYSTEM; DRUG DELIVERY DESIGN

Document Type: Research article

DOI: http://dx.doi.org/10.1166/jnn.2006.519

Publication date: 2006-08-01

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• Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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