Plasticization of a Protein-Based Film by Glycerol: A Spectroscopic, Mechanical, and Thermal Study
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- 作者：Chunli Gao ; Mats Stading ; Nikolaus Wellner ; Mary L. Parker ; Timothy R. Noel ; E. N. Clare Mills ; and Peter S. Belton
- 刊名：Journal of Agricultural and Food Chemistry
- 出版年：2006
- 出版时间：June 28, 2006
- 年：2006
- 卷：54
- 期：13
- 页码：4611 - 4616
- 全文大小：91K
- 年卷期：v.54,no.13(June 28, 2006)
- ISSN：1520-5118
文摘
Kafirin, the seed storage protein of the cereal sorghum, is highly homologous with the maize storageprotein zein. The effects of plasticisation of a kafirin film by glycerol in the absence of water wereexamined by a combination of spectroscopic (NMR and infrared), rheological, and calorimetricmethods. The results suggest that at low glycerol levels the glycerol is absorbed onto and possiblyinto the protein. Increasing the level of glycerol increases the motion of the protein and changes theprotein conformation. There are corresponding changes of the mechanical properties of protein films.At 40% (w/w) of glycerol, two glass transition temperatures were observed, one of which correspondedto the glass transition temperature of pure glycerol. This result indicates that at this level of plasticizerthere are sufficient glycerol/glycerol interactions occurring to allow a separate glass formation processfor glycerol.Keywords: Plasticization; glycerol; protein; kafirin; biodegradable; film