Related Experiment Video
Updated: Aug 26, 2025
09:56
High Resolution Physical Characterization of Single Metallic Nanoparticles
Published on: June 28, 2019
5.8K
Metal-Organic Cage as Single-Molecule Carrier for Solid-State Nanopore Analysis
Zhan Wang1,2, Rui Hu1, Rui Zhu1
1State Key Lab for Mesoscopic Physics and Frontiers Science Center for Nano-optoelectronics, Electron Microscopy Laboratory, School of Physics, Peking University, Beijing, 100871, China.
Small Methods
|October 10, 2022
Summary
Researchers developed a novel method using metal-organic cages to enhance the sensitivity and selectivity of solid-state nanopore sensors for detecting small biomolecules, paving the way for improved diagnostics.
Area of Science:
- Nanotechnology
- Biomolecular Engineering
- Analytical Chemistry
Background:
- Single-molecule detection is crucial for biological research, precision medicine, and early diagnosis.
- Solid-state nanopore sensors offer label-free detection but struggle with sensitivity and selectivity for small analytes.
- Existing methods face challenges in accurately identifying and quantifying minute biological targets.
Purpose of the Study:
- To enhance the sensitivity and selectivity of solid-state nanopore sensors for small biomolecule detection.
- To introduce a novel molecular carrier system for improved nanopore sensing capabilities.
- To demonstrate the potential of metal-organic cages in advancing diagnostic assays.
Main Methods:
- A metal-organic cage, PCC-57, was utilized as a molecular carrier to improve nanopore sensor performance.
- Oligonucleotides were employed as linkers to conjugate PCC-57 with target analytes.
- The system was tested for distinguishing between angiopep-2 and polyphosphoric acid, and for detecting human alpha-thrombin using aptamers.
Main Results:
- The PCC-57 carrier was found to be undetectable unless bound to target analytes.
- Successful differentiation of two small analytes (oligonucleotide-conjugated angiopep-2 and polyphosphoric acid) was achieved.
- High selectivity was demonstrated by detecting human alpha-thrombin using PCC-57-functionalized aptamers.
Conclusions:
- Metal-organic cages, such as PCC-57, can significantly enhance the sensitivity and selectivity of solid-state nanopore sensors.
- This approach enables the detection and differentiation of small biomolecules, overcoming previous limitations.
- The versatile nature of metal-organic cages offers a promising platform for future single-molecule screening of clinically relevant biomarkers.
