title: Structure evolution of gelatin particles induced by pH and ionic strength.
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.
authors.affiliation: Department of Appiled Chemistry, School of Chemical and Material Engineering, Jiangnan University, Wuxi, People's Republic of China.
authors.forename: Jing
authors.initials: J
authors.lastname: Xu
authors.forename: Tianduo
authors.initials: T
authors.lastname: Li
authors.forename: Furong
authors.initials: F
authors.lastname: Tao
authors.forename: Yuezhi
authors.initials: Y
authors.lastname: Cui
authors.forename: Yongmei
authors.initials: Y
authors.lastname: Xia
mesh_terms: D055598:Chemical Phenomena; D005780:Gelatin / Q000187:drug effects* / Q000648:ultrastructure*; D006863:Hydrogen-Ion Concentration; D008855:Microscopy, Electron, Scanning; D009994:Osmolar Concentration
chemical_list: D005780:Gelatin