1. Construction of a sensitive SWCNTs integrated SPR biosensor for detecting PD-L1 + exosomes based on Fe 3 O 4 @TiO 2 specific enrichment and signal amplification.
- Author
-
Liu H, Zhou Y, Chang W, Zhao X, Hu X, Koh K, and Chen H
- Subjects
- Humans, Biosensing Techniques methods, Limit of Detection, Neoplasms blood, B7-H1 Antigen blood, B7-H1 Antigen analysis, B7-H1 Antigen isolation & purification, Exosomes chemistry, Nanotubes, Carbon chemistry, Surface Plasmon Resonance methods, Titanium chemistry
- Abstract
Programmed cell death-ligand 1 positive (PD-L1
+ ) exosomes play a crucial role in the realm of cancer diagnosis and treatment. Nevertheless, due to the intricate nature of biological specimens, coupled with the heterogeneity, low refractive index (RI), and scant surface coverage density of exosomes, traditional surface plasmon resonance (SPR) sensors still do not meet clinical detection requirements. This study utilizes the exceptional electrical and optical attributes of single-walled carbon nanotubes (SWCNTs) as the substrate for SPR sensing, thereby markedly enhancing sensitivity. Furthermore, sp2 hybridized SWCNTs have the ability to load specific recognition elements. Additionally, through the coordination interaction of Ti with phosphate groups and the ferromagnetism of Fe3 O4 , efficient exosomes isolation and enrichment in complex samples are achievable with the aid of an external magnetic field. Owing to the high-quality and high-RI of Fe3 O4 @TiO2 , the response signal experiences amplification, thus further improving the performance of the SPR biosensor. The linear range of the SPR biosensor constructed by this method is 1.0 × 103 to 1.0 × 107 particles/mL, with a limit of detection (LOD) of 31.9 particles/mL. In the analysis of clinical serum samples, cancer patients can be differentiated from healthy individuals with an Area Under Curve (AUC) of 0.9835. This study not only establishes a novel platform for exosomes direct detection but also offers new perspectives for the sensitive detection of other biomarkers., Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2024 Elsevier B.V. All rights reserved.)- Published
- 2024
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