Sensitive and specific capture of polystyrene and polypropylene microplastics using engineered peptide biosensors

Area of Science:

• Environmental Science
• Biotechnology
• Analytical Chemistry

Background:

• Microplastic pollution in oceans is a growing environmental concern.
• Microplastics pose risks to marine ecosystems and organisms.
• Existing detection methods for microplastics can be time-consuming and complex.

Purpose of the Study:

• To develop a rapid and efficient method for detecting microplastics in marine environments.
• To investigate the use of hydrophobic peptides for microplastic detection.
• To assess the potential of peptide-based biosensors for environmental and biological sample analysis.

Main Methods:

• Selection of polystyrene and polypropylene as target microplastics.
• Evaluation of binding affinities of hydrophobic peptides to different plastic types.
• Testing peptide binding in various water conditions (deionized and saline) and on oxidized/unoxidized plastics.
• Application of peptide biosensors for microplastic detection in animal intestine extracts.

Main Results:

• Hydrophobic peptides demonstrated binding affinity to polystyrene and polypropylene.
• Peptide binding was confirmed on both unoxidized and plasma-oxidized plastics.
• The developed peptide biosensors successfully detected microplastics in complex biological samples (animal intestines).

Conclusions:

• Peptide-based biosensors offer a promising approach for rapid microplastic detection.
• This technology can enhance the efficiency of microplastic monitoring in marine ecosystems.
• Plastic-binding peptides could be utilized in future sensor designs for microplastic separation from seawater.