Gelatin film absorbable

Gelatin film, absorbable. USP6V/yf/m Local henuisiuiic... 

Photographic film is a transparent plastic coated with a gelatinous film containing a silver salt, usually AgBr. When the film is exposed to light, individual photons absorbed by the Ag ions cause an electron-transfer reaction that produces neutral silver atoms ... 

Uses of gelatin are based on its combination of properties reversible gel-to-sol transition of aqueous solution viscosity of warm aqueous solutions abUity to act as a protective coUoid water permeabUity and insolubUity in cold water, but complete solubUity in hot water. It is also nutritious. These properties are utilized in the food, pharmaceutical, and photographic industries. In addition, gelatin forms strong, uniform, clear, moderately flexible coatings which readily sweU and absorb water and are ideal for the manufacture of photographic films and pharmaceutical capsules. 

The film prepared at 50 C differs in that it no longer contains the triple helix structure. If the helix-coil (or collagen gelatin) transformation is complete, the absorption should no longer be related to the different structural levels but instead controlled by the tortuosity of the diffusion paths. The rate of water absorption is considerably slower with a decrease in the weight absorbed at low humidities. But the energy profile remains similar to the sample prepared at 20 C. We believe that the disappearance of the triple helix structure is incomplete and that the water tends initially to be absorbed by the structures still present. 

BenBettaieb et al. [188] displayed the effect of electron beam accelerator doses (0, 20, 40 and 60 kGy) on structural, mechanical and barrier properties of edible lightly plasticized chitosan-fish gelatin blend film. UV-vis analysis showed that all films displayed an absorbance peak between 280 and 385 nm. These peaks are shifted toward higher wavelengths after irradiation. This clearly showed some modifications in the interactions (hydrogen bonds, amide groups) between polymer chains induced by the irradiation. 

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