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Structure Evolution of Gelatin Particles Induced by pH and Ionic Strength
Author(s) -
Xu Jing,
Li Tianduo,
Tao Furong,
Cui Yuezhi,
Xia Yongmei
Publication year - 2013
Publication title -
microscopy research and technique
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.536
H-Index - 118
eISSN - 1097-0029
pISSN - 1059-910X
DOI - 10.1002/jemt.22164
Subject(s) - gelatin , ionic strength , chemistry , sodium dodecyl sulfate , chemical engineering , ionic bonding , micrometer , microstructure , crystallography , biophysics , chromatography , aqueous solution , ion , organic chemistry , optics , physics , engineering , biology
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. Microsc. Res. Tech. 76:272–281, 2013 . © 2012 Wiley Periodicals, Inc.