Portable hydrogel kit based on Michael addition reaction for (E)-2-hexenal gas detection

Area of Science:

• Plant pathology
• Analytical chemistry
• Nanotechnology

Background:

• Plants release volatile organic compounds (VOCs) in response to stress, offering potential for early disease detection.
• Phytophthora infestans infection in potatoes releases (E)-2-hexenal, a significant VOC marker.

Purpose of the Study:

• To develop a portable, on-site method for detecting (E)-2-hexenal for early identification of potato late blight.
• To create a low-cost fluorescent analytical tool utilizing gold nanoclusters.

Main Methods:

• Developed a hydrogel kit combining Michael addition reaction with cysteine-mediated etching of aggregation-induced emission gold nanoclusters (Au NCs).
• Utilized agarose hydrogel for enhanced sensor performance (sensitivity, selectivity, reaction time).
• Employed ImageJ software for quantitative analysis of fluorescence changes.

Main Results:

• Achieved a detection limit of 0.61 ppm for (E)-2-hexenal.
• Demonstrated high sensitivity, selectivity, and rapid reaction time.
• Successfully applied the method for early detection of potato late blight in field conditions.

Conclusions:

• The developed hydrogel kit offers a low-cost, portable, and effective tool for on-site plant disease detection.
• This approach provides a new avenue for early diagnosis of potato late blight.
• The sensor's performance highlights the potential of Au NCs in plant disease diagnostics.