Fiber-optic microarray for simultaneous detection of multiple harmful algal bloom species

Area of Science:

• Environmental Science
• Biotechnology
• Marine Biology

Background:

• Harmful algal blooms (HABs) pose significant threats to coastal ecosystems, public health, and economies.
• Accurate identification of toxic plankton species is crucial for effective HAB monitoring.
• Conventional methods face challenges in discriminating between toxic and nontoxic plankton due to high diversity.

Purpose of the Study:

• To develop a sensitive and specific method for detecting and enumerating key HAB species.
• To utilize fiber-optic microarrays and oligonucleotide probes for enhanced plankton analysis.
• To address limitations in current toxic algal detection techniques.

Main Methods:

• Fabrication of fiber-optic microarrays with oligonucleotide-coupled microspheres.
• Implementation of a sandwich hybridization assay using fluorescently labeled secondary probes.
• Application of the assay to detect Alexandrium fundyense, Alexandrium ostenfeldii, and Pseudo-nitzschia australis.

Main Results:

• Achieved a detection limit of approximately 5 cells for all target organisms within 45 minutes.
• Demonstrated successful detection in both cultured and field samples without prior amplification.
• Developed a multiplexed assay capable of simultaneous detection of multiple HAB species without cross-reactivity.

Conclusions:

• Fiber-optic microarrays offer a rapid and sensitive platform for HAB species detection.
• This assay facilitates efficient monitoring and enumeration of toxic plankton in environmental samples.
• The technology holds potential for improved management and mitigation of harmful algal blooms.