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Design and Development of Aptamer–Gold Nanoparticle Based Colorimetric Assays for In-the-field Applications
Published on: June 23, 2016
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A Label-Free Colorimetric Aptasensor for Flavokavain B Detection.
Sisi Ke1, Ningrui Wang2, Xingyu Chen1
1Jiangsu Key Laboratory of TCM Evaluation and Translational Research, School of Traditional Chinese Pharmacy, China Pharmaceutical University, Nanjing 211198, China.
Sensors (Basel, Switzerland)
|January 25, 2025
Summary
A new DNA aptasensor detects Flavokavain B (FKB), a toxic compound in kava, quickly and affordably. This method offers a simple, equipment-free alternative for on-site kava product safety monitoring.
Area of Science:
- Biochemistry
- Analytical Chemistry
- Biotechnology
Background:
- Flavokavain B (FKB), a chalcone from *Piper methysticum* (kava), is hepatotoxic, disrupting cellular redox balance and inducing apoptosis.
- Current detection methods like chromatography are sensitive but expensive and unsuitable for field use.
- There is a need for rapid, cost-effective, and portable methods for FKB detection.
Purpose of the Study:
- To develop a novel DNA aptasensor for the detection of Flavokavain B.
- To create a rapid, label-free, and cost-effective method for on-site FKB quantification.
- To provide a tool for quality control and safety assessment of kava products.
Main Methods:
- DNA aptamers against FKB were selected using library-immobilization and high-throughput sequencing.
- The best aptamer, FKB-S, was characterized for its binding affinity (KD = 280 nM) using microscale thermophoresis.
- A colorimetric aptasensor was constructed based on FKB-induced gold nanoparticle aggregation for label-free detection.
Main Results:
- Three aptamer families were identified, with FKB-S demonstrating high affinity for FKB.
- The developed aptasensor achieved a detection limit of 150 nM (43.46 ng/mL).
- The assay provided results rapidly, within 10 minutes, and was equipment-free.
Conclusions:
- The aptasensor offers a simple, cost-effective, and rapid method for on-site FKB detection.
- This technology is a promising tool for the quality control and safety monitoring of kava products.
- The aptasensor overcomes the limitations of traditional chromatographic methods for FKB analysis.
