Investigating the colloidal stability of fluorescent silica nanoparticles under isotonic conditions for biomedical applications

被引:17
|
作者
Nooney, Robert I. [1 ]
White, Angela [1 ]
O'Mahony, Christy [2 ]
O'Connell, Claire [1 ]
Kelleher, Susan M. [1 ]
Daniels, Stephen [1 ]
McDonagh, Colette [1 ]
机构
[1] Dublin City Univ, Sch Phys Sci, Natl Ctr Sensor Res, Biomed Diagnost Inst, Dublin 9, Ireland
[2] Georgia Inst Technol, Sch Chem & Biochem, Atlanta, GA 30332 USA
基金
爱尔兰科学基金会;
关键词
Silica nanoparticles; Colloidal stability; Surfactants; Proteins; Fluorescence; Immunoassay; ADSORPTION; SIZE; OPTIMIZATION; AGGREGATION; SURFACE; ABSENCE; CORONA;
D O I
10.1016/j.jcis.2015.05.051
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Fluorescent silica nanoparticle (NP) labels are of great interest in biomedical diagnostics, however, when used in bioassays under physiological conditions they rapidly agglomerate and precipitate from solution leading to high levels of non-specific binding. In this work, using size and zeta-potential data obtained from Dynamic and Electrophoretic Light Scattering analysis, the improvement in colloidal stability of silica NPs under physiological conditions was correlated with an increase in the concentration of three additives: (1) a protein, bovine serum albumin (BSA); (2) a neutral surfactant, Tween 20 (R); and (3) a charged surfactant, sodium dodecyl sulfate (SDS). The number of BSA molecules present in the NP corona at each concentration was calculated using UV-Vis spectroscopy and a bicinchoninic acid protein assay (BCA). The optimal concentration of each additive was also effective in stabilizing antibody labeled fluorescent nanoparticles (alpha NPs) under physiological conditions. Using a fourth additive, trehalose, the colloidal stability of alpha NPs after freeze-drying and long-term storage also significantly improved. Both as-prepared and freeze-dried alpha NPs were tested in a standard fluorescence immunoassay for the detection of human IgG. The as-prepared assay showed a higher sensitivity at low concentration and a lower limit of detection when compared to a free dye assay. Assays performed with freeze dried alpha NPs after 4 and 22 days also showed good reproducibility. (C) 2015 Elsevier Inc. All rights reserved.
引用
收藏
页码:50 / 58
页数:9
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