Fig. 3.

Influence of the time of storage on the release profiles of HS from microparticles. (empty circle) HS released from fresh microparticles, (empty square) HS released from microparticles after 1 month of storage at 40°C/75% RH, (empty upright triangle) HS released from microparticles after 6 months of storage at 40°C/75% RH, (empty diamond) HS released from microparticles after 12 months at 40°C/75% RH. Empty microparticles were used as blank. Data express the mean of the percentage of HS released ±SD, n = 3