Multi-Technique Flavoromics for Identifying Key Differential Volatile Compounds Underlying Sensory Profiles in Lager...

Area of Science:

• Food Science and Technology
• Analytical Chemistry
• Sensory Science

Background:

• Understanding inter-brand variations in lager beer flavor is crucial for the brewing industry.
• Volatile compounds significantly influence the sensory perception of beer.

Purpose of the Study:

• To systematically investigate inter-brand variations in volatile flavor compound profiles of lager beers.
• To identify key compounds contributing to distinct aroma and taste profiles.
• To provide a molecular basis for lager beer flavor and guide flavor modulation.

Main Methods:

• Integrated sensory evaluation with advanced analytical techniques: Gas Chromatography-Mass Spectrometry (GC-MS), GC×GC-TOF-MS, and GC-O-MS.
• Calculated odor activity values (OAV) and taste activity values (TAV) to identify aroma- and taste-active compounds.
• Employed Partial Least Squares Discriminant Analysis (PLS-DA), correlation analysis, and flavor addition experiments to pinpoint brand-specific compounds.

Main Results:

• Identified 594 volatile compounds, with 71 contributing to aroma (OAV ≥ 1) and 59 to taste (TAV ≥ 1).
• Confirmed 53 aroma-active compounds through GC-O-MS.
• Discovered 20 key differential flavor compounds (esters, alcohols, acids, etc.) responsible for fruity, floral, burnt, and sweet notes.
• Phenethyl alcohol showed significant brand variation and correlated strongly with fruity and floral aromas.

Conclusions:

• Specific volatile compounds, such as phenethyl alcohol, are critical determinants of distinct lager beer flavor profiles.
• The combination of these compounds creates unique sensory experiences across different beer brands.
• Findings offer a molecular understanding of lager beer flavor, enabling targeted strategies for flavor development and quality control in brewing.