Quantitation of Smoke Taint Markers in Wine using the Triple Quad LCMS-8050

Importance of the topic

Wildfires are increasing in frequency and intensity worldwide, leading to the uptake of smoke‐derived phenolic compounds by grapevines. These volatile phenols undergo glycosylation inside the grape, creating nonvolatile markers that evade sensory detection until fermentation releases the bound compounds, imparting undesirable “smoke taint” aromas in wine.

Objectives and Study Overview

This work aimed to develop and validate a rapid, sensitive method for quantifying two key smoke taint markers—guaiacol rutinoside and 4-methylguaiacol rutinoside—in white and red wines. Four wine samples (two white, two red) were analyzed using matrix‐matched calibration to determine native concentrations and assess method accuracy across representative matrices.

Used Instrumentation

The analysis employed a Shimadzu LC-40 Nexera HPLC system coupled to an LCMS-8050 triple quadrupole mass spectrometer with an electrospray ionization (ESI) source. Chromatographic separation was achieved on a reversed‐phase column at 40 °C with gradient elution over 15 minutes. Key MS parameters included a drying gas flow of 10 L/min, a heat block at 400 °C, and multiple reaction monitoring transitions of 464.2→147.1 for 4-methylguaiacol rutinoside and 450.2→147.0 for guaiacol rutinoside.

Main Results and Discussion

Matrix-matched calibration curves were generated in White Wine A and Red Wine A, covering 0.5–100 ng/mL (4-methylguaiacol rutinoside) and 0.5–113.2 ng/mL (guaiacol rutinoside). All curves exhibited excellent linearity (R2>0.999) and accuracy between 80–120%. Native concentrations of both markers in the four test wines were quantified, with Red Wine A containing 13.2 ng/mL guaiacol rutinoside. Spike-recovery experiments in White Wine B and Red Wine B confirmed method precision, yielding 92–115% accuracy.

Benefits and Practical Applications

• The method provides rapid (<15 min) and robust quantitation of smoke taint markers in diverse wine matrices.
• Matrix-matched calibration ensures accurate determination of native and spiked analyte levels.
• High sensitivity supports regulatory compliance and quality control in wineries and testing laboratories.

Future Trends and Applications

Advancements may include automated sample preparation to increase throughput, expansion to additional glycoside markers, and integration with high‐resolution mass spectrometry for broader profiling of smoke‐derived compounds. Coupling this approach with non‐targeted screening could further enhance early detection and mitigation strategies in the vineyard.

Conclusion

A validated LCMS-8050 triple quadrupole method permits accurate, high‐throughput quantitation of guaiacol and 4-methylguaiacol rutinosides in wine. With linear calibration, strong sensitivity, and reliable recoveries, it supports effective monitoring of smoke taint across wine production stages.

Reference

• Shimadzu Scientific Instruments. Quantitation of Smoke Taint Markers in Wine using the Triple Quad LCMS-8050. Application Note SSI-LCMS-139. January 2022.