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http://dx.doi.org/10.5764/TCF.2015.27.1.62

Color Stability of the Bioplastic containing Sorghum Extract Chelated by Fe(II) and Cu(II)  

Lee, Ga Hyun (Nano and Bio Research Division, Daegu Gyeonbuk Institute of Science and Technology)
Lee, Sung June (Nano and Bio Research Division, Daegu Gyeonbuk Institute of Science and Technology)
Jeong, Sang Won (Nano and Bio Research Division, Daegu Gyeonbuk Institute of Science and Technology)
Kim, Hyun-Chul (Nano and Bio Research Division, Daegu Gyeonbuk Institute of Science and Technology)
Choi, Jin Hyun (Department of Bio-fibers and Materials Science, Kyungpook National University)
Bae, Do Gyu (Department of Bio-fibers and Materials Science, Kyungpook National University)
Han, Sang Ik (Department of Functional Crop, National Institute of Crop Science)
Lee, Se Geun (Nano and Bio Research Division, Daegu Gyeonbuk Institute of Science and Technology)
Publication Information
Textile Coloration and Finishing / v.27, no.1, 2015 , pp. 62-69 More about this Journal
Abstract
To improve the color stability of the bioplastic containing sorghum extract, sorghum extract was chelated by a metal ion. The chelating activity was quantitatively evaluated under the various conditions. Chelation of sorghum extract by Cu(II) was determined by reaction with pyrocatechol violet, whereas Fe(II) chelation was investigated by forming complexes with ferrozine. Chelation of sorghum extract was increased rapidly with increasing concentrations of metal salt and sorghum extract. At a 0.1g/L metal salt addition level, the chelating activity of Fe(II) and Cu(II) were 66.7% and 54.2%, respectively. According to the chelation pH conditions, the sorghum extract was chelated almost 100% by Fe(II) above the pH 6.5. It was confirmed that Fe(II) was a strong chelator of sorghum extract than Cu(II). The sorghum extract chelated with metal salt exhibit higher thermal stability. The bioplastic containing chelated sorghum extract showed relatively less color change than the control.
Keywords
sorghum extract; chelation; metal salts; color stability; bioplastic;
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