Effect of gamma radiation on the physico-chemical properties of alginate-based films and beads |
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Authors: | Tanzina Huq Avik Khan Dominic Dussault Stephane Salmieri Ruhul A Khan Monique Lacroix |
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Institution: | 1. Department of Food Science and Technology, Gorgan University of Agricultural and Natural Resources, Gorgan, Iran;2. School of Chemistry, College of Science, University of Tehran, Iran |
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Abstract: | Alginate solution (3%, w/v) was prepared using deionized water from its powder. Then the solution was exposed to gamma radiation (0.1?25 kGy). The alginate films were prepared by solution casting. It was found that gamma radiation has strong effect on alginate solution. At low doses, mechanical strength of the alginate films improved but after 5 kGy dose, the strength started to decrease. The mechanism of alginate radiolysis in aqueous solution is discussed. Film formation was not possible from alginate solution at doses >5 kGy. The mechanical properties such as puncture strength (PS), puncture deformation (PD), viscoelasticity (Y) coefficient of the un-irradiated films were investigated. The values of PS, PD and Y coefficient of the films were 333 N/mm, 3.20 mm and 27%, respectively. Alginate beads were prepared from 3% alginate solution (w/v) by ionotropic gelation method in 5% CaCl2 solution. The rate of gel swelling improved in irradiated alginate-based beads at low doses (up to 0.5 kGy). |
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