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Investigation of Pigments in Thai Purple Rice Using Electron Paramagnetic Resonance Imaging and HPLC.
J Nutr Sci Vitaminol (Tokyo). 2019; 65(Supplement):S217-S221.JN

Abstract

Paramagnetic species (radicals) related pigments in Thai purple rice were investigated by electron paramagnetic resonance (EPR), X-band (9 GHz) EPR imaging (EPRI), and HPLC. The location and 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 organic radicals, Mn2+, and Fe3+ based on the g-values and hyperfine components of the EPR signals. Noninvasive two-dimensional (2D) EPRI revealed that these stable radicals are primarily located in the pigmented region of purple rice, while very few radicals were observed in the interior of the rice. HPLC revealed that the major compounds were cyanidin-3-O-glucoside and peonidin-3-O-glucoside. EPR, EPR imaging, and HPLC results indicate that the stable radicals contain the radical state of anthocyanins and are mostly found within the pigmented embryo region of purple rice. They could be either associated with antioxidant activities or could be one of the products of their oxidative decomposition.

Authors+Show Affiliations

Division of Regional Innovation, Graduate School of Health Sciences, Hirosaki University.Department of Pharmaceutical Sciences, Faculty of Pharmacy, Chiang Mai University.Department of Pharmaceutical Sciences, Faculty of Pharmacy, Chiang Mai University. Cluster of Excellence on Biodiversity based Economics and Society (B.BES-CMU), Chiang Mai University.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

31619634

Citation

Nakagawa, Kouichi, et al. "Investigation of Pigments in Thai Purple Rice Using Electron Paramagnetic Resonance Imaging and HPLC." Journal of Nutritional Science and Vitaminology, vol. 65, no. Supplement, 2019, pp. S217-S221.
Nakagawa K, Yooin W, Saenjum C. Investigation of Pigments in Thai Purple Rice Using Electron Paramagnetic Resonance Imaging and HPLC. J Nutr Sci Vitaminol (Tokyo). 2019;65(Supplement):S217-S221.
Nakagawa, K., Yooin, W., & Saenjum, C. (2019). Investigation of Pigments in Thai Purple Rice Using Electron Paramagnetic Resonance Imaging and HPLC. Journal of Nutritional Science and Vitaminology, 65(Supplement), S217-S221. https://doi.org/10.3177/jnsv.65.S217
Nakagawa K, Yooin W, Saenjum C. Investigation of Pigments in Thai Purple Rice Using Electron Paramagnetic Resonance Imaging and HPLC. J Nutr Sci Vitaminol (Tokyo). 2019;65(Supplement):S217-S221. PubMed PMID: 31619634.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Investigation of Pigments in Thai Purple Rice Using Electron Paramagnetic Resonance Imaging and HPLC. AU - Nakagawa,Kouichi, AU - Yooin,Wipawadee, AU - Saenjum,Chalermpong, PY - 2019/10/18/entrez PY - 2019/10/18/pubmed PY - 2020/3/17/medline KW - EPR imaging KW - HPLC KW - anthocyanin KW - pigment KW - purple rice SP - S217 EP - S221 JF - Journal of nutritional science and vitaminology JO - J Nutr Sci Vitaminol (Tokyo) VL - 65 IS - Supplement N2 - Paramagnetic species (radicals) related pigments in Thai purple rice were investigated by electron paramagnetic resonance (EPR), X-band (9 GHz) EPR imaging (EPRI), and HPLC. The location and 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 organic radicals, Mn2+, and Fe3+ based on the g-values and hyperfine components of the EPR signals. Noninvasive two-dimensional (2D) EPRI revealed that these stable radicals are primarily located in the pigmented region of purple rice, while very few radicals were observed in the interior of the rice. HPLC revealed that the major compounds were cyanidin-3-O-glucoside and peonidin-3-O-glucoside. EPR, EPR imaging, and HPLC results indicate that the stable radicals contain the radical state of anthocyanins and are mostly found within the pigmented embryo region of purple rice. They could be either associated with antioxidant activities or could be one of the products of their oxidative decomposition. SN - 1881-7742 UR - https://www.unboundmedicine.com/medline/citation/31619634/Investigation_of_Pigments_in_Thai_Purple_Rice_Using_Electron_Paramagnetic_Resonance_Imaging_and_HPLC_ L2 - https://dx.doi.org/10.3177/jnsv.65.S217 DB - PRIME DP - Unbound Medicine ER -