Surface-Enhanced Raman Spectroscopy as a Low-Cost Alternative for the Indirect Detection of Glyphosate-Based Products

Area of Science:

• Environmental Chemistry
• Analytical Chemistry
• Spectroscopy

Background:

• Glyphosate-based herbicides are prevalent in agriculture, raising concerns about environmental contamination and human health risks via water and food.
• Current methods for detecting glyphosate are often costly and time-consuming, necessitating simpler and faster analytical techniques.
• Glyphosate's chemical properties make it a challenging analyte to detect accurately and efficiently.

Purpose of the Study:

• To develop a sensitive, simple, and rapid method for the indirect detection of glyphosate.
• To utilize surface-enhanced Raman spectroscopy (SERS) combined with silver nanoparticles (AgNPs) and the ninhydrin reaction for glyphosate analysis.
• To validate the detection of glyphosate in commercial herbicide formulations.

Main Methods:

• Employing surface-enhanced Raman spectroscopy (SERS) with silver nanoparticles (AgNPs).
• Utilizing the ninhydrin reaction to form a detectable product with glyphosate.
• Analyzing the characteristic Raman peaks at 660 and 790 cm⁻¹ associated with the glyphosate-ninhydrin complex.

Main Results:

• The SERS method successfully detected glyphosate indirectly through its reaction with ninhydrin.
• Distinct Raman peaks at 660 and 790 cm⁻¹ were identified, correlating directly with glyphosate concentration.
• The method demonstrated practicality for analyzing environmental samples with relatively high glyphosate concentrations.

Conclusions:

• The developed SERS method provides an effective strategy for detecting glyphosate, a crucial environmental pollutant.
• This approach offers a reliable and straightforward alternative for monitoring glyphosate levels, supporting environmental safety and public health.
• The method is adaptable for various analytical conditions, with potential for sensitivity adjustments for broader applications.