• Korean Journal of Food Science and Technology
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• v.44 no.5
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• pp.577-582
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• 2012

The purpose of this study was to investigate the preparation and physicochemical characteristics of n-octenylsuccinylated (OSAn) rice starches with different rice amylose contents. Amylose contents of Jinsumi flour and Milyang 261 flour were 15.42 and 20.31%, respectively. After processing by alkali treatment, amylose contents of Jinsumi rice starch and Milyang 261 rice starch were 34.21% and 39.32%, respectively. After OSAn treatment, the degree of substitution and reaction efficiency of Jinsumi starch were higher than those of Milyang 261. The stability of the modified Jinsumi emulsion was higher than that of the Milyang 261 emulsion. Viscosity of the Jinsumi emulsion was higher than that of the Milyang 261 emulsion. When the emulsions were spray dried, modified Jinsumi rice starch showed excellent coating efficiency compared to that of modified Milyang 261 rice starch. Therefore, Jinsumi was more suitable than Milyang 261 to apply for encapsulation as wall materials.

• KOREAN JOURNAL OF PACKAGING SCIENCE & TECHNOLOGY
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• v.29 no.1
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• pp.9-14
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• 2023

The application of starch-based films is limited by the poor water vapor barrier and mechanical properties. In this study, plasticized octenyl-succinated corn starch (OTPS) was mixed into Poly (butylene adipate-co-terephthalate) (PBAT) with various concentration (0/0.25/0.5/0.75 wt%) of epoxidized soybean oil (ESO) to enhance the mechanical properties and the hydrophobicity of blends. Tensile Strength and elongation at break of PBAT/OTPS film was slightly strengthened as the added ratio of ESO raised to 0.5 wt%, yet lessened again in 0.75 wt% sample. The yield strength and elastic modulus were highest in 0.25wt% of ESO added. In thermal properties, the melting temperature (T_m) and crystallization temperature (T_c) were highest at ESO 0.25 and the maximum degradation temperature (T_max) of components of the films were developed as ESO added. Also, it has been proved that the addition of hydrophobic substances reduces the hydrophilicity of the film by contact angle. This suggests the use of epoxidized oil for preparing films based on high TPS content allows obtaining enhanced interfacial adhesion. This study confirmed that ESO acts as a compatibilizer between OTPS and PBAT to improve the mechanical properties and hydrophobicity of the sample. The sample containing 0.5wt% of ESO was the most suitable for packaging application.