Abstract
A ratiometric nanoensemble-functionalized Surface-Enhanced Raman Spectroscopy (SERS) chip is proposed and an ultrasensitive “sandwich” structure introduced for the detection of 5-HT to achieve early diagnosis of colon cancer. The SERS-based chip contains core–shell SERS active substrates coded by different Raman tags with Raman-silent region peaks (Au@EBP@Au NR arrays and Au@MBN@Ag NPs) and then identify-function molecule modification to construct the “sandwich” structure (Au@EBP@Au NR arrays/5-HT/Au@MBN@Ag NPs). Au@EBP@Au NR arrays showed excellent SERS performance, including good uniformity with an RSD of 5.53% and an enhancement factor (EF) of 2.13 × 107. The intensity ratio of the peaks in the Raman silent region was proportional to the concentration of 5-HT in the range 5 × 10−7–1 × 10−3 M, with a detection limit (LOD) of 4.9 × 10−9 M. Excellent assay accuracy was also demonstrated, with recoveries in the range 96.80% to 104.96%. Finally, we found that 5-HT expression levels in normal human sera were much lower than those in colon cancer patients by using a SERS-based chip for determination of the concentration of 5-HT in clinical colon cancer serum. This result suggested that the proposed approach has potential for detecting 5-HT by ratiometric SERS-based chips for early diagnosis of colon cancer.
Graphical Abstract
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The processed data required to reproduce these findings cannot be shared at this time as the data also forms part of an ongoing study.
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Funding
We are grateful for the support by the Fujian Provincial Department of Science and Technology guiding Project (2020Y0019), the Youth and Middle-Aged Backbone Talents Training Project of Fujian Health Commission (2020GGA003), the National Natural Science Foundation of China (No. 61975031), the Program for Industry University Cooperation Project of Fujian Province (2020Y4006), the Innovative Research Team in Science and Technology in Fujian Province University, the Achievement Transformation Project of Fuzhou Science and Technology Bureau (2020-GX-20), and the Fushimei Agricultural and Rural Maker Space (Minke xing〔2019〕No. 2).
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Min Fan: investigation, writing—original draft. Sirui Han: investigation, methodology, writing—review and editing. Ruiyun You: resources, writing—review and editing. Jingbo Chen: investigation, formal analysis. Shangyuan Feng: formal analysis. Yudong Lu: supervision, funding acquisition, resources.
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Fan, M., Han, S., Huang, Q. et al. Ratiometric SERS-based assay with “sandwich” structure for detection of serotonin. Microchim Acta 190, 100 (2023). https://doi.org/10.1007/s00604-023-05634-0
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DOI: https://doi.org/10.1007/s00604-023-05634-0