Journal
COLLOIDS AND SURFACES B-BIOINTERFACES
Volume 214, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.colsurfb.2022.112460
Keywords
Free testosterone; High sensitivity; Gap-enhanced SERS nanotag; Magnetic nanobead; Linear dynamic detection range
Funding
- National Key Researchand Development Program of China [2021YFC2700200, 2019YFA0905200, 2017YFA0205700]
- National Natural Science Foundation of China [31900571, 32101118]
- Fundamental Research Project of Shenzhen Science & Technology Innovation Committee [JCYJ20180306174552939]
- Foundation Research Project of Jiangsu Province the Natural Science Youth Fund [BK20200395]
- Large Instruments Open Foundation of Nantong University [KFJN2155]
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A highly sensitive method for the analysis of free testosterone (FT) was developed using magnetic nanobeads (MNBs) and gap-enhanced surface enhanced Raman scattering (SERS) nanotags. The proposed method achieves high detection sensitivity and a wider linear dynamic detection range, making it suitable for rapid disease diagnosis and analysis of other substances.
The quantitative determination of trace free testosterone (FT) is of great significance for the diagnosis of androgen-related endocrine diseases. Herein, a fascinating detection protocol was developed for highly sensitive FT analysis through a competitive immunoassay mechanism, which was composed of magnetic nanobeads (MNBs) and gap-enhanced surface enhanced Raman scattering (SERS) nanotags. With the MNBs as detection carriers, trace FT could be enriched by simple magnetic separation. The SERS nanotag constructed with silver gold core-shell nanoparticle was acted as quantitative label, and Raman indicators were located at the interface between silver core and gold shell. It is demonstrated that the as-proposed protocol achieves high detection sensitivity for FT of 12.11 fg mL(-1), and wider linear dynamic detection range (LDR) in the concentration of 100 fg mL(-1) to 100 ng mL(-1) with R-2 value of 0.979, which is due to the enhanced Raman signal of the gap-enhanced SERS nanotag and the high surface-to-volume ratio of the MNB, respectively. Taking advantages of such sensitivity and accuracy approach, the as-developed powerful strategy presents potential applications for rapid disease diagnosis through analyzing trace levels of FT, and can also provide guidance for the exploitation of analysis project of other analytes.
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