Competitive Immunoassay in a Microfluidic Biochip for In-Field Detection of Abscisic Acid in Grapes

Area of Science:

• Agricultural Science
• Analytical Chemistry
• Biotechnology

Background:

• Viticulture is economically significant but threatened by biotic/abiotic stresses, exacerbated by climate change.
• Current methods for detecting grapevine stress are time-consuming, costly, and require specialized personnel.
• Early detection of stress is crucial for effective vineyard management and maintaining grape and wine quality.

Purpose of the Study:

• To develop a miniaturized, field-deployable analytical device for early detection of grapevine stresses.
• To create a microfluidic platform capable of quantifying abscisic acid (ABA) at low concentrations.
• To validate the device's performance against established analytical techniques using real grape samples.

Main Methods:

• Development of a microfluidic platform for competitive immunoassay-based detection of abscisic acid.
• Optimization of the microfluidic system to achieve a minimum detection limit of 10^-11 mg/mL for ABA in buffer.
• Comparative analysis of grape berry samples using the developed microfluidic system and high-performance liquid chromatography (HPLC).

Main Results:

• The microfluidic platform successfully detected abscisic acid (ABA) in buffer down to 10^-11 mg/mL.
• Real grape berry samples at the veraison stage showed detectable ABA levels up to 10^-5 mg/mL using the microfluidic system.
• Results from the microfluidic system were consistent with benchmark techniques like HPLC.

Conclusions:

• The developed microfluidic system provides a sensitive and rapid method for detecting grapevine stress via ABA measurement.
• This miniaturized device offers a practical solution for on-site, early stress detection in viticulture.
• The technology has the potential to improve vineyard management and mitigate the economic impact of environmental stresses.