Abstract
Gelatin/hyaluronic acid (Gel/HA) microspheres were prepared by emulsion–coagulation method using glutaraldehyde as cross-linker. The influence of treatment methods, including removing water by different concentrations of acetone/water solution and freeze drying, on surface morphology was also investigated. The in vitro release behaviors of icariin from smooth Gel/HA microspheres were also studied. The results indicated that the smooth and wrinkled Gel/HA microspheres were obtained when treated by pure acetone/water solution (volume ratio of 3:1) and pure acetone, respectively. More wrinkled microcracks could be observed when the Gel/HA microspheres were washed by pure acetone for longer time. The microspheres with porous structure were prepared when the obtained smooth Gel/HA microspheres were treated by freeze-drying method at −45 °C. The size of Gel/HA microspheres increased with increasing immersion time in distilled water and showed deeper and bigger pores after freeze-drying process. The cumulative drug release of icariin from the microspheres decreased with increasing GA content. The results of icariin release kinetics from Gel/HA microspheres indicated Fickian diffusion.
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This work was financially supported by the National Natural Science Fund of China (No. 51273062 and No. 51443002), the Hunan Provincial Natural Science Fund of China (No. 12JJA003) and the Aid Program for Science and Technology Innovative Research Team in Higher Educational Institutions of Hunan Province.
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Zhou, Z., He, S., Huang, T. et al. Preparation of gelatin/hyaluronic acid microspheres with different morphologies for drug delivery. Polym. Bull. 72, 713–723 (2015). https://doi.org/10.1007/s00289-015-1300-0
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DOI: https://doi.org/10.1007/s00289-015-1300-0