73D-22 |
Use of biodegradable film for functional sachet in active package |
S. CHEN and C. H. Liu. Department of Food Science, Fu Jen Catholic University, #510, Chungcheng Rd., Shinjuang, Taipei, 24205, Taiwan Biodegradable films have an environmental advantage, however, the feasibility of use as a primary packaging material is limited due to the sensitivity to water. Many chemical reactions are regulated by water, therefore, the application of biodegradable nature to take up water which is then used to initiate necessary reaction should be a novel utilization in active package. This study investigated the utilization of biodegradable film to form sachet containing functional ingredients in active package. Sachet was made of methyl cellulose (MC) and starch-filled PVA film and heat-sealed. Oxygen scavenging agent was formulated using erythorbate, ferrous ion and NaCl, and silica gel absorbing ethanol was developed as the microbial growth inhibitor. The effect of actively modifying headspace was monitored by residual O2 and ethanol vapor concentration under controlled RH% in a model system. Different moisture absorption patterns were characterized from MC and starch-filled PVA films under various RH% environments, and greater amount of moisture was absorbed by MC in model study. The efficiencies of O2 scavenging and ethanol release were associated with RH% conditions. Optimal ethanol vapor release was found at RH% ranging 70-80% for both films, and more ethanol vaporized into headspace was determined using MC film. Residual O2 contents were observed 10% in 24hr and 15% in 48hr using MC and starch-filled PVA film, respectively. These mechanisms could be due to water absorbed by film and then transferred to active ingredients. Greater amount of O2 scavenged and ethanol vapor release was noticed as MC film used to form functional sachet. This could be due to more moisture absorbed by MC film, and water is the key to initiate these mechanisms.
Session 73D, Food Packaging
|