Microspherical Particles of Solid Dispersion of Polyvinylpyrrolidone K29-32 for Inhalation Administration

Figure 11

SEM images of PVP K29-32/PHE composites, formed using spray drying process with three different spray caps with 4.0 μm (a), 5.5 μm (b), and 7.0 μm (c) hole size and size distribution curves calculated from these images for spray caps with 4.0 μm (d), 5.5 μm (e), and 7.0 μm (f) hole size.

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(b)

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(d)

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