83B-9 |
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W. S. CHOI, Dept. of Food & Biotechnology, Chungju National Univ., 123 Geomdan-ri, Iryu-myeon, Chungju, 380-702, South Korea Edible protein films were produced from aqueous solution of 10%(w/w) sword bean protein isolate(SBPI), or water extract materials(WEM) which were isolated or extracted from sword bean(canavalia gladiata) and its pod, to prolong the shelf life of food products when it is used as a packaging material and also prevent the tooth decay as a anticariogenic material. The objective of this research was to determine the physical, mechanical properties and antimicrobial activities of SBPI and WEM films. Film forming solutions, which are solutions of SBPI or WEM including a plasticizer(glycerol), were denatured by heat (90 C, 30 min), dried on the film casting dishes to produce films. These films were compared their mechanical properties to soy bean and whey protein films, and also examined their antimicrobial activities. Our results showed that the SBPI and WEM films were enough strong and elastic to be handled. The transparence of the films was similar to that of soy protein film. Their physical and mechanical properties were comparable with those of other protein films made of soy and whey protein. The SBPI film did not exhibited inhibitory effect against all test microorganism; Streptococcus mutans KCTC 3065, Staphylococcus aureus KCTC 2199, Escherichia coli O157 KCTC 0019, Salmonella typhimurium KCTC 2053, Pseudomonas aeruginosa KCTC 1636, Escherichia coli KCTC1041. However, the WEM film produced large inhibition zone against Streptococcus mutans KCTC 3065, Staphylococcus aureus KCTC 2199. These results suggest that the WEM film can prevent or reduce the rate of microbial spoilage on the contacted surface area of solid food products and also prevent the develop of the dental caries. Therefore, it may prolong the shelf life of food products when it is used as a packaging material and also prevent the tooth decay as a anticariogenic material.
Session 83B, Food Packaging: Applications of edible coatings, antimicrobial films, and sensors in food packaging
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