Dual-Mode Optical Sensor Array for Detecting and Identifying Perillaldehyde in Solution Phase and Plant Leaf with...

Area of Science:

• Analytical Chemistry
• Sensor Technology
• Smart Agriculture

Background:

• Detecting active components in plants and foods is crucial for smart agriculture.
• Dual-mode optical assays offer robust and reliable analysis parameters.
• Perillaldehyde is an active component requiring efficient detection methods.

Purpose of the Study:

• To develop a novel turn-on, dual-mode sensor array for evaluating perillaldehyde.
• To enable rapid, selective, and sensitive detection of perillaldehyde.
• To create a smartphone-enabled system for on-site analysis in smart agriculture.

Main Methods:

• A sensor array with three reactive indicators (rhodamine-hydrazine, squaraine-hydrazine, 2,4-dinitrophenylhydrazine) was synthesized.
• Colorimetric and fluorescent changes were measured upon reaction with perillaldehyde.
• Solid-state sensor strips and a smartphone readout system were developed for analysis.

Main Results:

• The sensor array exhibited significant colorimetric and fluorescent changes in response to perillaldehyde.
• Optimal colorimetric sensing showed good responses up to 100 mM in ethanol.
• High sensitivity (detection limit ~20.0 μM) and selectivity were achieved.
• The sensor strips allowed for semiquantitative evaluation of perillaldehyde in perilla leaves within 15 min.

Conclusions:

• The developed turn-on sensor array provides a novel method for evaluating perillaldehyde in solution and vapor phases.
• The sensor possesses features of naked-eye recognition, easy operation, and disposability.
• This sensor array has significant potential for precise perillaldehyde detection in smart agriculture.