Dissertation > Industrial Technology > General industrial technology > Materials science and engineering > Special structural materials

Study on Edible Starch Films Added Sodium Alginate

Author WangJingPing
Tutor YuJiuGao
School Tianjin University
Course Organic Chemistry
Keywords Starch film Sodium alginate Mechanical Properties Water Vapor Transmission Rate Transparent oily
CLC TB383.2
Type Master's thesis
Year 2007
Downloads 416
Quotes 8
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With the increasing awareness of environmental protection , the traditional plastic packaging film can not meet the requirements of the people in the food packaging . Starch is a natural polysaccharide , the wide variety of sources , inexpensive , environmentally friendly materials . In recent years , the use of biodegradable starch material to the preparation of edible packaging film more and more attention , to become a world research hotspot . Glycerol plasticized corn starch , potato starch , pea starch film based exploration and innovation , adding sodium alginate as a reinforcing component to improve the performance of starch edible film . First -forming process to explore using the casting method, coating , and to determine the optimal parameters : corn starch : 100ml solution 5g raw starch , glycerin and starch mass ratio of 1:4 , the sodium alginate join a maximum of 3g heated stirring speed of 120 r / min , 0.09MPa lower degassed 10min , 50 ° C dry film film-forming ; potato and pea starch : 5g native starch in 200 ml of solution , the heating and stirring speed of 180 r / min , degassed 15 min, other conditions were the same as corn starch . By infrared , scanning electron microscopy to study the morphology of the membranes , and test the mechanical properties of the film , the water absorption and water vapor transmission resistance oily to to study sodium alginate starch film performance improvement . The results show that : the presence of strong interaction between the sodium alginate and starch molecules , can form a dense film structure . Adding sodium alginate 3g , starch film tensile strength can be improved more than doubled. Alginate added can be in a certain extent, to increase the water resistance of the potato starch film and pea starch film . The relative humidity of the case , adding sodium alginate can be maintained at a good level of the mechanical properties of the starch film . The water vapor permeability of the membrane increases with sodium alginate added in an amount decreased, resistance oily improve .

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