Evaluation of Cartilage Regeneration in Gellan Gum/agar Blended Hydrogel with Improved Injectability

Gellan gum is known to be one of biocompatible materials that resemble living tissues, con- tinuously delivering stem cells or general cells, and filling voids in the wound. In spite of many advantages of gellan gum, it has difficulty in application as inserting the scaffolds into body. In order to generalize gellan gum for medical purpose, it is necessary to increase the injectability of gellan gum. In this study, gellan gum solutions with 0.2, 0.4, 0.6, 0.8 wt% of agar were prepared. The obtained hydrogels were tested for rheological properties and chondrocytes adhesion, morphology and proliferation. Results shown that the addiction of agar, in the starting GG solution, allows to extrude the material producing micro-porous scaffolds. Biological evaluation demon- strated that the adhesion and proliferation of chondrocytes increase with the presence of agar in the final structure. The solutions composed of GG and agar represent an efficient, fast and high reproducible methodology with the potential to be used as injectable hydrogel for carti- lage regeneration purposes.