Journal
CHEMICAL ENGINEERING JOURNAL
Volume 437, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2022.135362
Keywords
Galvanic replacement; Signal amplification; In-situ growth; Background-free; Antibody-thrift; CuS nanospheres
Categories
Funding
- National Science Foundation of China [21675127, 31972150]
- Key Industries Innovation Chain Project of Shaanxi Province [2019ZDLSF07-08]
- Natural Science Foundation Project in Guangdong Provincial [2020A1515010778]
- Qinghai Provincial Key Laboratory of Qinghai-Tibet Plateau Biological Resource [2020-ZJ-T05]
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In this study, a galvanic replacement (GR) method was proposed to enhance the color intensity of nanomaterials without the use of reducing agent, thus avoiding drawbacks such as background interference, precipitation, and low reproducibility. The GR-mediated CuS-NS signal amplification was used in lateral flow immunoassay (LFIA) to detect salbutamol, resulting in reduced consumption of antibodies and improved sensitivity.
In-situ growth of metal materials for signal amplification was proposed alternative to enhance color intensity of nanomaterials thereby improving detective sensitivity. However, drawbacks, such as background interference, precipitation caused by premature self-nucleation, and low reproducibility, are hard to be eliminated owing to the use of requisite reducing agent. Herein, galvanic replacement (GR) inspiring in-situ growth of Au nanoparticles (Au NP) on CuS nanospheres (CuS-NS) is first applied into lateral flow immunoassay (LFIA) for the detection of salbutamol (SAL). It is established to escape the natural disadvantages above-mentioned rely on the force from redox potential difference rather than the assistance of reducing agent. Additionally, compared with the group of excess CuS that pursuits signal strength stubbornly, galvanic replacement-mediated CuS-NS signal amplification (GR-mediated CNSA) cuts down the consumption of antibodies and thus improves sensitivity. Obviously, the number of antibodies was reduced 2-fold and the sensitivity increased 5-fold compared with excess CuS on the premise that excess CuS obtained the same output signal as GR-mediated LFIA. This work explores the patterns of galvanic replacement inspired in-situ growth signal amplification, and broadens the range of potential applications in LFIA for rapid and accurate analysis of hazardous substances.
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