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Facile and Cost-Effective Detection of Saxitoxin Exploiting Aptamer Structural Switching
Karol Alfaro1, Paulina Bustos1, Ciara O Sullivan2
1Centro de Investigación y Gestión de Recursos Naturales, Facultad de Ciencias, Universidad de Valparaíso, Gran Bretańa 1111, Valparaíso, Chile.
Food Technology and Biotechnology
|December 2, 2016
Summary
A new, rapid method detects paralytic shellfish poison (saxitoxin) using DNA-binding dyes and aptamers. This simple technique offers sensitive quantification of saxitoxin, crucial for public health and marine toxin monitoring.
Area of Science:
- Marine Biology
- Analytical Chemistry
- Biotechnology
Background:
- Saxitoxin (STX) is a potent neurotoxin responsible for paralytic shellfish poisoning (PSP).
- Red tides caused by certain algae blooms can lead to dangerous accumulation of STX in shellfish.
- Accurate and rapid detection of STX is vital for food safety and environmental monitoring.
Purpose of the Study:
- To develop a simple, rapid, and sensitive method for detecting saxitoxin (STX).
- To utilize a novel DNA-binding dye to monitor STX-aptamer interactions.
- To establish a quantitative detection range and limit for STX.
Main Methods:
- A novel detection method employing a next-generation double-stranded DNA dye was developed.
- Fluorescence changes of STX-binding aptamers were monitored upon exposure to varying STX concentrations.
- Aptamer folding alterations upon STX binding were inferred from fluorescence differentiation.
Main Results:
- The method demonstrated a quantitative detection range for STX from 15 ng/mL to 3 µg/mL.
- A low detection limit of 7.5 ng/mL for STX was achieved.
- The technique is rapid, requires minimal sample volume, and indicates STX presence through aptamer conformational changes.
Conclusions:
- A simple and rapid fluorescence-based method for STX detection has been successfully developed.
- The method shows promise for sensitive and quantitative analysis of STX in relevant samples.
- This technique offers a valuable tool for monitoring paralytic shellfish poison in marine environments and food products.
