Rapid Identification Method for Gamma-Irradiated Soybeans Using Gas Chromatography-Mass Spectrometry Coupled with a...

Area of Science:

• Food Science
• Analytical Chemistry
• Radiation Chemistry

Background:

• Gamma irradiation is used for soybean sterilization and preservation.
• Accurate identification of irradiated soybeans is crucial for regulatory compliance and consumer safety.
• Conventional methods for detecting irradiation may be time-consuming or require solvents.

Purpose of the Study:

• To develop and validate a rapid analytical method for identifying gamma-irradiated soybeans.
• To establish 1,7-hexadecadiene as a reliable marker for gamma irradiation in soybeans.
• To optimize headspace solid-phase microextraction (HS-SPME) conditions for marker detection.

Main Methods:

• Utilized headspace solid-phase microextraction gas chromatography/mass spectrometry (HS-SPME-GC/MS).
• Employed partial least squares discriminant analysis (PLSDA) to identify marker compounds.
• Optimized extraction parameters using response surface methodology (RSM).

Main Results:

• 1,7-Hexadecadiene was identified as a specific marker for gamma-irradiated soybeans (≥ 0.1 kGy).
• Optimal HS-SPME conditions were determined: carboxen/polydimethylsiloxane fiber, 98 °C extraction temperature, and 55 min extraction time.
• The marker's presence was confirmed and distinguished from other treatments (heat, steam, microwave, sonication, UV).

Conclusions:

• HS-SPME-GC/MS provides a rapid, sensitive, and solvent-free method for detecting gamma-irradiated soybeans.
• 1,7-Hexadecadiene is a robust marker for verifying soybean irradiation.
• This method offers significant advantages over conventional detection techniques.