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5.2.3. Particle size estimation
Doub et al. [51] reported the application of Raman-CI
for ingredient specific particle size characterisation of nasal
spray formulations. Samples of aqueous suspension were
sprayed onto inverted aluminium-coated glass microscope
slides and allowed to dry before imaging. A Raman Imaging
particle size distribution (PSD) protocol was developed
and validated using polystyrene (PS) miscrosphere size
standards. Good statistical agreement was obtained
between reported PS particle sizes and those estimated
using Raman-CI. Moreover, Raman–CI was suitable for
distinguishing between active samples and placebos. It
was noted, however, that vigorous validation of Raman-
CI for PSD is required, due to the high variability associated
with replicate measurements.
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