Geographical-based variations in white truffle Tuber magnatum aroma is explained by quantitative differences in key...

Area of Science:

• Food Science
• Microbiology
• Analytical Chemistry

Background:

• The aroma of Tuber magnatum, a prized culinary truffle, is influenced by numerous factors that remain poorly understood.
• Investigating the volatile organic compounds and sensory profiles is crucial for understanding truffle aroma variations.

Purpose of the Study:

• To determine if Tuber magnatum aroma depends on geographic provenance.
• To assess the influence of maturity and bacterial communities on truffle volatile profiles and aroma.

Main Methods:

• Headspace volatile analysis using gas chromatography-mass spectrometry-olfactometry (GC-MS-O).
• Sensory assessment of truffle extract aroma profiles.
• Estimation of fruiting body maturity via spore melanisation.
• Bacterial community profiling using 16S rRNA amplicon sequencing.

Main Results:

• Key odor-active compounds were present in all truffles, but concentrations varied.
• Sensory analysis discriminated truffle extracts by site, yet individual volatile profiles showed greater variation within sites than across geographic areas.
• Fruiting body maturity did not significantly influence aroma profiles.
• Bacterial communities exhibited high variability, partially explained by provenance, with rare taxa linked to non-odor-active volatiles.

Conclusions:

• Individual truffle properties, rather than provenance, are the primary drivers of Tuber magnatum aroma specificity.
• Bacterial constituents may serve as biomarkers for truffle provenance and correlate with non-odor-active volatile compounds.