Ulrikh E.V. 1
Prosekov A.Y. 1
Dyshlyuk L.S. 1
1 FGBOU VPO «Kemerovo Technological Institute of Food Industry»
Natural hydrocolloids are a promising material for the production of biodegradable fi lms. The aim of this study was to conduct a comparative analysis of the physico-mechanical, thermal and dielectric properties of biodegradable fi lms prepared on the basis of natural polysaccharides (corn starch, amylase starch, carrageenan) and gelatin. It has been established that the thickness and strength properties of fi lms based on gelatin higher than that of fi lms based on carrageenan. Marked reduction in the thickness and strength properties of fi lms with increasing content of plasticizer in the composition of glycerin. It was shown that the melting point of the fi lms on the basis of the above carrageenans values for fi lms based on starch and gelatin. According to the results of differential scanning calorimetry revealed that the maximum value of the melting temperature (70,4°C) characterized by a fi lm based on carrageenan and minimum (66,4°C) – a fi lm based on maize starch. Gelatin based fi lms have the largest value of glass transition temperature (155,8°C), a fi lm of carrageenans – lowest (155,8°C). An analysis of the dielectric properties of the fi lms showed that with increasing frequency there is a decrease of the dielectric constant for all samples analyzed, with the maximum reduction of the magnitude observed in the frequency range from 5 to 1000 Hz.