Abstract
Modification of chemical structure of gelatin is an important point of research due to its extensive applications in food and package industry. Various methods are prescribed in literature for this purpose. Among them the radiation method is very important due to its easiness and economy. The authors have used gamma irradiation for this purpose and studied the effect of gamma irradiation and annealing on spectroscopic and thermal properties of gelatins. For this purpose spectroscopic (Electron spin resonance (ESR) and Fourier transform infrared (FTIR)), thermal (differential scanning calorimetry) and scanning electron microscope are used. ESR spectra of irradiated gelatin have shown quartet structure at room temperature and the signal is annealed by heating the irradiated gelatin. FTIR spectra of gelatin are recorded under different conditions. After irradiation, change in intensity and shift in band position is observed, which are associated with the chemical changes brought out by radiation. Gamma irradiation brings changes in thermal and surface morphology of gelatin.
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