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Decrease of 4-vinylguaiacol during beer aging and formation of apocynol and vanillin in beer
Nele Vanbeneden1, Daan Saison, Filip Delvaux
1Centre for Malting and Brewing Science, Department of Microbial and Molecular SystemsFood and Microbial Technology, K.U. Leuven, Kasteelpark Arenberg 22, B-3001 Leuven, Belgium. nele.vanbeneden@biw.kuleuven.be
The decrease of 4-vinylguaiacol (4VG) in aged beer was studied. Vanillin and apocynol were identified as key products, shifting beer aroma from clove to vanilla notes.
Area of Science:
- Food Chemistry
- Sensory Science
- Analytical Chemistry
Background:
- 4-vinylguaiacol (4VG) contributes a clove-like aroma to fresh specialty beers.
- Understanding 4VG degradation is crucial for predicting aged beer flavor profiles.
Purpose of the Study:
- To investigate the decrease of 4-vinylguaiacol (4VG) during beer aging.
- To identify the degradation products of 4VG and their contribution to flavor changes.
Main Methods:
- Gas Chromatography-Mass Spectrometry (GC-MS) analysis.
- High-Performance Liquid Chromatography with Electrochemical Detection (HPLC-ECD) analysis.
- Forced and natural aging of beer model solutions and actual beers.
Main Results:
- Vanillin and apocynol were identified as the primary degradation products of 4VG, accounting for up to 85% of its decrease.
- Vanillin formation was dependent on oxygen presence in the headspace.
- Apocynol formation was significantly influenced by beer pH.
Conclusions:
- The degradation of 4VG into vanillin and apocynol alters beer flavor from clove to vanilla notes during aging.
- Oxygen and pH are critical factors influencing the formation of these flavor-changing compounds.
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