The Analysis of Resveratrol in Red Wine by On-Fiber Derivatization/SPME

Significance of the Topic

Resveratrol is a natural phytoalexin produced by grapes in response to stress. It has attracted substantial interest for its antioxidant, cardioprotective and potential anti-cancer effects. Red wine represents a key dietary source of resveratrol, making reliable quantification essential for research, quality control and nutritional evaluation.

Objectives and Study Overview

This work aims to demonstrate a streamlined method for extracting and analyzing trans-resveratrol from red wine. The approach integrates solid phase microextraction (SPME) with on-fiber derivatization followed by gas chromatography–mass spectrometry (GC-MS). Performance is assessed via calibration, sensitivity, linearity and recovery in spiked and unspiked wine samples.

Methodology and Instrumentation

• Sample preparation: California Merlot wine diluted 3:1 with 12% ethanol-water solution.
• SPME fiber: 85 µm polyacrylate fiber selected for polar semivolatiles and resistance to swelling.
• Extraction: Immersion at ambient temperature for 15 min with stirring at 400 rpm.
• On-fiber derivatization: 20 min exposure to BSTFA +1% TMCS (Sylon-BFT) vapors to silylate all three hydroxyl groups.
• Desorption: Thermal desorption at 280 °C for 2 min directly in the GC injection port.
• GC-MS analysis: SLB-5ms column (30 m × 0.25 mm I.D., 0.25 µm), oven 100 °C (1 min) to 325 °C at 10 °C/min, MSD interface 325 °C, scan range m/z 40–450, helium carrier gas.

Key Results and Discussion

Calibration from 10 to 300 µg/L yielded excellent linearity (R² = 0.9987), supporting quantitative extraction and derivatization. The method detected the lowest standard in full scan mode. Recoveries in wine spiked at 100 µg/L averaged 110% accuracy. Chromatograms displayed distinct peaks for trans-resveratrol and a smaller cis isomer, the latter likely formed during analysis or wine aging.

Benefits and Practical Applications

• High sensitivity and low detection limits without solvent extraction.
• Rapid sample preparation and direct fiber-to-instrument transfer.
• Quantitative performance suitable for quality control and nutritional studies.
• Durable polyacrylate fiber tolerates silylating reagents without degradation.

Future Trends and Opportunities

Advances may include coupling on-fiber derivatization SPME with tandem MS for enhanced selectivity, exploring novel derivatization chemistries and fiber coatings for broader analyte coverage, and integrating automated SPME systems for high-throughput wine analysis and plant metabolite profiling.

Conclusion

On-fiber SPME combined with in-situ silylation and GC-MS provides a robust, sensitive and accurate method for resveratrol analysis in red wine. The simplified workflow, quantitative performance and fiber stability support its application in research, industry and regulatory settings.

References

• ScienceDaily. Red Wine Compound Resveratrol Demonstrates Significant Health Benefits. Retrieved June 18, 2009.
• Cai L., Koziel J.A., Dharmadhikari M., van Leeuwen J. Rapid Determination of trans-resveratrol in red wine by solid-phase microextraction with on-fiber derivatization and multidimensional gas chromatography–mass spectrometry. Journal of Chromatography A, 2009, 1216, 281–287.
• Viñas P., Campillo N., Martínez-Castillo N., Hernández-Córdoba M. Solid-phase microextraction on-fiber derivatization for the analysis of polyphenols in wine and grapes using gas chromatography–mass spectrometry. Journal of Chromatography A, 2009, 1216, 1279–1284.