Development of a novel evaluation method for air particles using surface plasmon resonance spectroscopy analysis

Area of Science:

• Environmental Science
• Analytical Chemistry
• Biophysics

Background:

• Air particle analysis is crucial for environmental monitoring and health risk assessment.
• Current methods for characterizing air particles can be complex and time-consuming.
• Developing rapid and sensitive detection techniques for airborne particulates is essential.

Purpose of the Study:

• To develop and validate a novel evaluation method for air particles using surface plasmon resonance (SPR) spectroscopy.
• To utilize a liposome-modified sensor chip as a model for respiratory epithelial cell membranes.
• To characterize the interaction and adsorption/desorption behavior of various air particles on the model membrane.

Main Methods:

• An L1 sensor chip was functionalized with immobilized liposomes to mimic cell membranes.
• Suspensions of certified reference materials, diesel particulate matter, vehicle exhaust, urban particulate matter, coal fly ash, and rock particles were prepared.
• Filtrates of these samples were analyzed using SPR spectroscopy to detect particle-membrane interactions.
• SPR sensorgram patterns were analyzed to understand particle adsorption and desorption dynamics.

Main Results:

• Distinct SPR sensorgram patterns were observed for different types of air particles.
• Diesel particulate matter exhibited strong interaction and low dissociation with the liposome-coated sensor.
• Coal fly ash and rock particles showed weaker interactions with the model membrane.
• The SPR method effectively differentiated between various particulate samples based on their binding characteristics.

Conclusions:

• The developed SPR-based method offers a novel approach for evaluating and characterizing air particles.
• The liposome-modified sensor chip serves as an effective model for assessing particle-membrane interactions.
• This technique provides valuable insights into the adsorption/desorption behavior of airborne particulates, aiding in environmental risk assessment.