Integrating photothermal effect and peroxidase-like activity of inorganic/organic nanocomposite to advance photothermometric cholesterol sensing performance

• Published in: Sensors and actuators. B, Chemical Vol. 418; p. 136250
• Main Authors: Li, Jianying, Huang, Huiyi, Rao, Honghong, Luo, Mingyue, Zhang, Kehui, Liu, Haile, Qiang, Ruibin, Xue, Zhonghua
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.11.2024
• Subjects: Cholesterol; Dual-signal integration; Host-guest recognition; Peroxidase-like activity; Photothermal signal amplification; Host-guest recognition; Peroxidase-like activity; Dual-signal integration; Photothermal signal amplification; Cholesterol
• ISSN: 0925-4005; 1873-3077
• DOI: 10.1016/j.snb.2024.136250

Photothermometric sensors with a portable thermometer as signal reader have been extensively used in the field of point-of-care testing (POCT) due to their simplicity, low cost and high practicability. However, a long-standing challenge of low sensitivity has greatly limited the development and application, especially for most nanozyme-based sensing systems. We herein demonstrated an enhanced photothermometric cholesterol (CHOL) sensor by integrating the photothermal effect and peroxidase-like activity of inorganic/organic nanocomposite. In this design, CHOL selectively binds to the PB@PDA@β-CD inorganic/organic nanoprobe, which not only effectively inhibits the photothermal response of PB@PDA@β-CD, but also suppresses the peroxidase-like activity of PB@PDA@β-CD and resulting in a significant decrease on the photothermal response of nanozymes catalyzed oxTMB. Therefore, we have developed a new strategy for signal-amplified photothermal detection CHOL with dual-signaling transduction channels. The limit of detection (LOD) was 0.15 μM (S/N=3), which can meet the demand for CHOL detection in serum samples, and has potential application in early diagnosis and quantitative analysis of disease. •Organic/inorganic nanocomposite was developed as photothermometric nanoprobe.•A dual signal channel-based nanoprobe was employed to fabricate signal-amplified photothermometric sensor.•Host-guest recognition was recommended to improve the specificity of detection.