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High sensitive detection method for protein by combining the magnetic separation with cation exchange based signal
Jin Xu1, Qian-Mei Zhang1, Dong-Xu Zhao1
1School of Life Science, Beijing Institute of Technology, Beijing 100081, China.
Talanta
|April 11, 2017
Summary
This study presents a highly sensitive method for detecting prostate-specific antigen (PSA), a key prostate cancer biomarker. The new technique offers improved detection limits and repeatability compared to existing ELISA kits for clinical use.
Area of Science:
- Biochemistry
- Analytical Chemistry
- Nanotechnology
Background:
- Prostate-specific antigen (PSA) is a critical biomarker for prostate cancer development and treatment efficacy.
- Accurate and sensitive detection of low-abundance PSA in serum is essential for clinical diagnosis.
Purpose of the Study:
- To develop a facile and highly sensitive method for serum PSA detection.
- To improve upon the performance of existing diagnostic tools like ELISA kits.
Main Methods:
- Integration of immunomagnetic separation with cation exchange-based signal amplification.
- Utilizing quantum dots (QDs) and a Zn2+ responsive dye (Fluozin-3) for fluorescence signal amplification.
- Development of nanoparticle preparation and immunoprobe construction for PSA capture and detection.
Main Results:
- Achieved a low detection limit of 1.56 pg/mL for PSA.
- Established a wide linear detection range from 1.56 ng/mL to 25 ng/mL.
- Demonstrated good repeatability with an intra-coefficient variation of 3.18%.
Conclusions:
- The developed method exhibits superior sensitivity and a wider linear range compared to commercial ELISA kits.
- This high-sensitivity method shows significant potential for clinical application in PSA detection.
- The integrated approach offers a promising advancement in prostate cancer diagnostics.