Journal Textile Coloration and Finishing Year / Vol., Issue, Month 2015 / V.27,no.1,Mar Title Color Stability of the Bioplastic containing Sorghum Extract Chelated by Fe(Ⅱ) and Cu(Ⅱ) Authors Ga Hyun Lee, Sung June Lee, Sang Won Jeong, Hyun-Chul Kim, Jin Hyun Choi1, Do Gyu Bae1, Sang Ik Han2 and Se Geun Lee† Institution/Affiliations Daegu Gyeonbuk Institute of Science and Technology, 1Kyungpook National University, 2National Instit Pages/Total page pp.62 ~ 69 / 8 Language Korean Abstract 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 Keywords: sorghum extract, chelation, metal salts, color stability, bioplastic Download   Reference http://www.koreascience.or.kr/article/ArticleFullRecord.jsp?cn=OSGGBT_2015_v27n1_62&ordernum=7