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Microsc Res Tech. 2013 Mar;76(3):272-81. doi: 10.1002/jemt.22164. Epub 2012 Dec 28.

Structure evolution of gelatin particles induced by pH and ionic strength.

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  • 1Department of Appiled Chemistry, School of Chemical and Material Engineering, Jiangnan University, Wuxi, People's Republic of China.

Abstract

Microstructure of gelatin particles played a key role in determining the physicochemical properties of gelatin. Ionic strength and pH as systematic manners were considered to affect gelatin particles structure on the micrometer scale. Scanning electron microscopy was used for depicting the morphologies of gelatin particles. Increasing pH to 10.0 or decreasing pH to 4.0, spherical, spindle, and irregular aggregates of gelatin particles at 2, 6, 10, and 14% solution (w/w) were all transformed to spindle aggregates. When NaCl was added to the system, the molecular chains of gelatin possibly rearranged themselves in a stretched state, and the ribbon aggregates was observed. The structural transitions of gelatin aggregates were strongly depended on the electrostatic repulsion. In the gelatin-sodium dodecyl sulfate (SDS) case, the micrometer scale of aggregates was larger and the different degrees of cross-links were induced through hydrophobic interaction and electrostatic repulsion.

Copyright © 2012 Wiley Periodicals, Inc.

PMID:
23280857
[PubMed - indexed for MEDLINE]
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