Quantitative determination of vanillin and its detection threshold in sake

Area of Science:

• Food Chemistry
• Analytical Chemistry
• Sensory Science

Background:

• Vanillin is a common aroma compound in foods and beverages.
• Its role in the complex aroma profile of sake remains largely uncharacterized.
• Understanding vanillin levels is key to appreciating sake's sensory qualities.

Purpose of the Study:

• To develop and validate a sensitive analytical method for quantifying vanillin in sake.
• To determine the odor detection threshold of vanillin specifically within the sake matrix.
• To investigate the concentration of vanillin in diverse sake types, including aged varieties.

Main Methods:

• High-performance liquid chromatography coupled with tandem mass spectrometry (HPLC-MS/MS) was employed for vanillin quantification.
• The analytical method was rigorously validated for linearity, precision, and recovery.
• Odor detection threshold experiments were conducted using a panel of trained tasters.

Main Results:

• A validated HPLC-MS/MS method demonstrated excellent linearity (R² >0.99) and low detection limits (1.7 μg/L).
• Young sake contained vanillin below the odor detection threshold (78.9 μg/L), while aged sake showed concentrations up to 1727.5 μg/L.
• Vanillin levels in most ambient-aged sake exceeded the detection threshold after 11-15 years of aging.

Conclusions:

• The validated HPLC-MS/MS method provides accurate vanillin quantification in sake, essential for flavor analysis.
• Vanillin concentration significantly increases with sake aging, particularly in barrel-aged varieties, impacting aroma.
• This research offers a foundation for exploring sake aroma and guiding brewers in managing vanillin during production.