Unique Metabolic Profiles of Korean Rice
Yujin Kang, Bo Mi Lee, Eun Mi Lee et al.
Foods · DOI
Read original publicationMetabolomics deconvolutes the factors shaping rice chemistry: polishing explains 37.5% of variance, variety 13.5%, and cultivation region 4.6% — the first study to simultaneously quantify all three, with 127 of 156 metabolites enriched in brown rice.
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Multi-Factor Metabolomics
156 metabolites identified across GC-TOF MS and LC-Orbitrap MS platforms. Two varieties (Ilpum, Odae) x two polishing types (brown, white) x five Korean regions. PERMANOVA quantifies: polishing 37.5% > variety 13.5% > region 4.6%.
Brown Rice Superiority
127 of 156 metabolites more abundant in brown rice. Top enrichments: cafestol (12x, anti-inflammatory diterpene) and reduced glutathione (10x, antioxidant). Only 3 compounds higher in white rice.
Variety Fingerprints
Despite 95.3% genetic similarity, Odae and Ilpum show substantially different metabolic profiles. Odae enriched in trigonelline (7.4x in brown rice) — a plant alkaloid with antidiabetic and neuroprotective effects.
Terroir Signal
Regional metabolic signatures partially associated with rainfall patterns and soil texture (loam content). Tryptophan metabolites imply microbiome-plant interactions influencing crop chemistry.
Why It Matters
Provides the methodology for making terroir computable — directly applicable to Italian DOP rice varieties across Piemonte, Lombardia, and Veneto growing regions. Metabolomics can authenticate variety identity, verify provenance claims, and connect growing conditions to flavor profiles.