Journal
ANALYTICA CHIMICA ACTA
Volume 1002, Issue -, Pages 97-104Publisher
ELSEVIER
DOI: 10.1016/j.aca.2017.11.067
Keywords
Gold nanorods; Seed-mediated growth; Surface plasmon resonance; Ellagic acid
Categories
Funding
- National Natural Science Foundation of China [21775014, 21505012, 81501837]
- Chongqing Research Program of Basic Research and Frontier Technology [cstc2017jcyjAX0368]
- Chongqing Research Program on Teaching Reform of Higher Education [153062]
- Chongqing Undergraduate Training Program for Innovation and Entrepreneurship [201610637075]
- Program for Top-Notch Young Innovative Talents of Chongqing Normal University [02030307-00026]
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Seed-mediated growth has been employed as a simple and powerful means to the shape-controlled synthesis of metal nanocrystals. In this work, we apply the principle of seed-mediated growth in analytical chemistry, and achieve improved sensitivity due to the low energy barrier in the target-induced formation of bimetallic nanoparticles with core-shell structure. As a result, a simple, reliable, highly sensitive and selective method for the detection of ellagic acid (EA), a naturally occurring polyphenolic antioxidant, has been developed. With the aid of EA in alkaline solution, Ag+ ions can be transformed to Ag atoms and deposit on the surfaces of Au nanorods (AuNRs, act as seeds here) to generate Au@Ag core-shell nanorods, accompanied by blue shift of the longitudinal localized surface plasmon resonance (LSPR) band of AuNRs from near-infrared region to shorter wavelengths. Based on the linear relationship between the wavelength change of longitudinal LSPR band and the concentration of EA, our method achieves a detectable range of 0.2-20 mu M and a limit of detection as low as 40 nM toward EA. This approach is highlighted by its high sensitivity for EA assay, which benefits from the viewpoint of thermodynamics in the nucleation/growth mode of metal nanoparticles. Moreover, this method shows high selectivity for EA detection when potential species coexist, and thus has been successfully applied in the detection of EA in skin-whitening cosmetics. The proposed strategy of seed-mediated growth herein can also be extended to other systems for sensing. (c) 2017 Elsevier B.V. All rights reserved.
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