Different coatings for the HS-SBSE grape volatile analysis in model solution: Preliminary results

Area of Science:

• Analytical Chemistry
• Food Science
• Environmental Analysis

Background:

• Traditional methods for analyzing wine volatiles often involve solvents and high energy consumption.
• Head Space Stir Bar Sorptive Extraction (HS-SBSE) offers a more environmentally friendly alternative.
• Optimizing HS-SBSE requires evaluating different sorbent coatings and operating conditions.

Purpose of the Study:

• To compare the efficacy of poly(ethylene glycol) (PEG)-modified silicone (EG-Silicone) and polyacrylate (PA) coatings against polydimethyl siloxane (PDMS) for analyzing wine volatiles.
• To investigate the impact of two Cryogenic Injection System (CIS) temperatures (0°C and 25°C) on volatile compound recovery.
• To develop a faster, cheaper, and more environmentally friendly analytical procedure for wine aroma compounds.

Main Methods:

• Head Space Stir Bar Sorptive Extraction (HS-SBSE) was employed using model wine solutions.
• Three stir bar coatings were tested: EG-Silicone, PA, and PDMS.
• The influence of two CIS temperatures (0°C and 25°C) was evaluated for fifteen key grape volatile compounds.

Main Results:

• PDMS coating demonstrated higher affinity for terpenes and norisoprenoids, particularly at 25°C CIS temperature.
• EG-Silicone and PA coatings showed better response for C6 compounds, benzaldehyde, and eugenol, irrespective of CIS temperature.
• EG-Silicone and PA coatings exhibited a higher memory effect, likely due to their lower desorption temperatures (220°C) compared to PDMS (295°C).

Conclusions:

• EG-Silicone and PA coatings are effective alternatives to PDMS for specific wine volatile analyses, offering tailored selectivity.
• The choice of coating and CIS temperature can be optimized for targeted volatile compound recovery in wine analysis.
• This HS-SBSE approach provides a more sustainable and efficient method for wine aroma profiling.