Much interest is currently drawn to edible films, from proteins, polysaccharides, fats, or their combination. With a polymeric nature, gelatin has a good film-forming capability and replacing synthetic plastics with naturally degradable films is the perfect solution for minimizing undesirable and harmful effects of synthetic waste. The main problem is their fairly high hydrophilic and poor mechanical properties compared to conventional synthetic films. In the present study, films of fish gelatin with ratios of 15%, 10%, 5% and 20% to carboxy methyl cellulose were prepared by casting at 85 ° C. The effects of different concentrations of carboxy methyl cellulose on water vapor permeability (WVP), water absorption capacity (WAC) and solubility were assessed. The results obtained showed that increasing concentrations of carboxy methyl cellulose reduced WVP and increased WAC and solubility of gelatin films. Generally, the addition of carboxy methyl cellulose improves transparency and physicochemical properties of gelatin films, and facilitates the use of these biopolymers in packaging industries.

Spectroscopic measurements in the range of 10 kHz to MHz at different temperatures are reported for Au/CIMgPc/Au thin film sandwich devices. The ac conductivity is found to vary with the angular frequency ω as ωn where the index n≈ 1at high frequencies indicating the predominance of a hopping conduction mechanism in this material at low temperatures and high excitation frequencies. The variation of activation energy is studied as a function of temperature and frequency. The capacitance data are analysed within the framework of the Goswami model [10].      

In this paper the effect of sterilization method by gamma-ray on structure and cytotoxicity of polyurethane film surface has been investigated. For this purpose reactive urethane prepolymer was synthesized by the reaction between TDI with a mixture of PEG and Castor oil (50/50, w/w). The cured prepolymer films were prepared due to the reaction of reactive prepolymer with air moisture under ambient conditions. The polyurethane films were sterilized by gamma-ray (25 kGy). The surface structure of sterilized polyurethane film was observed by SEM and compared to that of the unsterilized film. Also, the in vitro interaction of fibroblast L929 cells and sterilized polyurethane film was evaluated. Results showed no signs of cell toxicity.