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We investigated the pigments in Thai purple rice using electron paramagnetic resonance (EPR), X-band (9 GHz) EPR imaging (EPRI), and HPLC. The location and spatial distribution of the paramagnetic species in purple and white rice were determined by EPR and EPRI. EPR primarily detected three paramagnetic species in purple rice, which were identified as stable radicals, Mn2+, and Fe3+ based on the gvalues and hyperfine components of the EPR signals. Subsequent noninvasive two-dimensional (2D)doi:10.5650/jos.ess18093 pmid:30305563 fatcat:g7ebwnylw5gnrewzoqzcjhybbq