Normal and cancer cells response on the thin films based on chitosan and tannic acid.

A novel aspect of tissue engineering is the material selective influence on the different cell types. The cell viability is a parameter which determine the cell ability to proliferate in the contact with material. In the experimental study the thin films based on chitosan and tannic acid mixture in ratio 80/20, 50/50 and 20/80 were tested. The surface roughness decreases with increasing tannic acid content. The cell culture was established on the proposed films. In vitro tests were carried out for the different cell lines as MNT-1, SK-MEL-28, Saos-2, HaCaT and BMSC. The result showed the dependence on the material influence on the various cell lines.

Properties of scaffolds based on chitosan and collagen with bioglass 45S5.

Scaffolds based on chitosan (CTS), collagen (Coll) and glycosaminoglycans (GAG) mixtures cross-linked by tannic acid (TA) with bioglass 45S5 addition were obtained with the use of the freeze-drying method. The prepared scaffolds were characterised for morphology, mechanical strength and degradation rate. Moreover, cell viability on the obtained scaffolds was measured with and without the presence of ascorbic acid and dexamethasone. The main purpose of the research was to compare the effectiveness of bioglass 45S5 influence on the physicochemical and biological properties of scaffolds. The results demonstrated that the scaffolds based on the blends of biopolymers cross-linked by TA are stable in an aqueous environment. Scanning electron microscope images allowed the observation of a porous scaffold structure with interconnected pores. The addition of bioglass nanoparticles improved the mechanical properties and decreased the degradation rate of composite materials. The biological properties were improved for 20% tannic acid addition compared to 5%. However, the addition of bioglass 45S5 did not change to cells response significantly.