Dispersion and stability optimization of TiO2 nanoparticles in cell culture media.
Accurate evaluation of engineered nanomaterial toxicity requires not only comprehensive physical-chemical characterization of nanomaterials as produced, but also thorough understanding of nanomaterial properties and behavior under conditions similar to those used for in vitro and in vivo toxicity studies. In this investigation, TiO(2) nanoparticles were selected as a model nanoparticle and bovine serum albumin (BSA) was selected as a model protein for studying the effect of protein-nanoparticle interaction on TiO(2) nanoparticle dispersion in six different mammalian, bacteria, and yeast cell culture media. Great improvement in TiO(2) dispersion was observed upon the addition of BSA, even though the degree of dispersion varied from medium to medium and phosphate concentration in the cell culture media was one of the key factors governing nanoparticle dispersion. Fetal bovine serum (FBS) was an effective dispersing agent for TiO(2) nanoparticles in all six media due to synergistic effects of its multiple protein components, successfully reproduced using a simple "FBS mimic" protein cocktail containing similar concentrations of BSA, γ-globulin, and apo-transferrin.
California NanoSystems Institute, Department of Civil & Environmental Engineering, University of California at Los Angeles, Los Angeles, California 90095, USA.
Zhaoxia
Z
Ji
Xue
X
Jin
Saji
S
George
Tian
T
Xia
Huan
H
Meng
Xiang
X
Wang
Elizabeth
E
Suarez
Haiyuan
H
Zhang
Eric M V
EM
Hoek
Hilary
H
Godwin
André E
AE
Nel
Jeffrey I
JI
Zink
D018929:Cell Culture Techniques; D003470:Culture Media; D046529:Microscopy, Electron, Transmission; D053758:Nanoparticles; D014025:Titanium / Q000737:chemistry*; D014961:X-Ray Diffraction
D003470:Culture Media; C009495:titanium dioxide; D014025:Titanium