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Shape factor of the isolated nanoparticles showed the best circular shape at 32.5 μg/mg of capsaicin concentration. Subsequently, the increase in capsaicin concentration caused a loss of shape. The equation of shape factor (Sf) is also displayed. Conditions: digital measurement of n = 180 nanoparticle images at 1376 × 1032 pixels and 8 bits of compression; resolution set at 2.1 pixels/nm. Values are the means of three experimental replicates ± standard deviations.
