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Oh, Y.A.,Oh, Y.J.,Song, A.Y.,Won, J.S.,Song, K.B.,Min, S.C. Academic Press, etc 2017 FOOD SCIENCE AND TECHNOLOGY -ZURICH- Vol.75 No.-
<P>Effects of lemongrass oil (LO) droplet size in the LO/chitosan emulsion on the emulsion's coating effectiveness in improving microbiological safety and preserving grape berries (Vitis vinifera L. x V. labruscana Bailey) were investigated. LO was homogenized with a chitosan solution (1 g/100 g) and Tween 20 (0.25 g/100 g) by high shear mixing (HSM; 10,000 rpm, 1 min) or dynamic high pressure processing (DHP; 103-172 MPa, 1-3 passes), forming LO coating emulsions. The particle sizes of the HSM and DHP emulsions were 461.9-632.6 nm and 204.2-378.8 nm, respectively. DHP emulsions were more stable than HSM emulsions. Compared with the HSM emulsion, the DHP emulsion coating resulted in higher initial inhibition of Salmonella typhimurium; greater growth inhibition of total mesophilic aerobes, yeasts, and molds; and retention of color, total soluble solid content, and antioxidant activity during storage at 25 degrees C (P < 0.05). The sensory results suggest that the DHP emulsion minimized differences in sensory attributes compared with uncoated grape berries more effectively than did the HSM emulsion coating. The nanoemulsion coating with smaller LO droplets demonstrated greater efficiency in increasing microbial safety against Salmonella and preserving grape berries, compared with the coating with larger droplets. (C) 2016 Elsevier Ltd. All rights reserved.</P>
Oh, Y.A.,Roh, S.H.,Min, S.C. IRL Press ; Elsevier Science Ltd 2016 Food hydrocolloids Vol.58 No.-
<P>This study investigated the effects of cold plasma treatment (CPT) using various plasma-forming gases on the physical properties of defatted soybean meal (DSM)-based edible film (DSM film). The effect of packaging smoked salmon using a cold plasma (CP)-treated DSM film on the storage stability of salmon was also evaluated. DSM film was formed by casting film-forming solutions (DSM/glycerol at a ratio of 10: 3) prepared by high-pressure (172 MPa) homogenization. Among the O-2-, N-2-, air-, He- and Ar-CPTs, Ar-CPT, which increased elongation and lightness of the DSM film, was optimized against tensile strength, elongation, and water vapor permeability using a response surface analysis. Optimal plasma generation time and power were predicted as 15 min and 400 W, respectively. The tensile strength, elongation, and moisture barrier property of DSM film increased by 6.8%, 13.4%, and 24.4%, respectively, after CPT at optimal conditions. The CPT formed DSM film that decomposed easily and retarded lipid oxidation and hardness reduction of smoked salmon during storage at 4 degrees C. The results from this study suggest the use of CPT for improving the applicability of DSM film in food packaging. (C) 2016 Elsevier Ltd. All rights reserved.</P>