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A Sensitive Gold Nanoparticle-Based Colorimetric Aptasensor for Staphylococcus Aureus

A Sensitive Gold Nanoparticle-Based Colorimetric Aptasensor for Staphylococcus Aureus

Jinglei Yuan, Shijia Wu, Nuo Duan, Xiaoyuan Ma, Yu Xia, Jie Chen, Zhansheng Ding, Zhouping Wang

Talanta. 2014 Sep;127:163-8.

PMID: 24913871

Abstract:

In this study, a gold nanoparticle-based colorimetric aptasensor for Staphylococcus aureus (S. aureus) using tyramine signal amplification (TSA) technology has been developed. First, the biotinylated aptamer specific for S. aureus was immobilized on the surface of the wells of the microtiter plate via biotin-avidin binding. Then, the target bacteria (S. aureus), biotinylated-aptamer-streptavidin-HRP conjugates, biotinylated tyramine, hydrogen peroxide and avidin-catalase were successively introduced into the wells of the microtiter plate. After that, the existing catalase consumed the hydrogen peroxide. Finally, the freshly prepared gold (III) chloride trihydrate was added, the color of the reaction production would be changed and the absorbance at 550 nm could be measured with a plate reader. Under optimized conditions, there was a linear relationship between the absorbance at 550 nm and the concentration of S. aureus over the range from 10 to 10(6) cfu mL(-1) (with an R² of 0.9947). The limit of the developed method was determined to be 9 cfu mL(-1).

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP16961254	Gold(III) chloride trihydrate		16961-25-4	Price

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