Yaeko Suzuki1, Yoshito Chikaraishi2, Nanako O Ogawa2, Naohiko Ohkouchi2, Takashi Korenaga3. 1. Department of Chemistry, Tokyo Metropolitan University, 1-1 Minami-Ohsawa, Hachioji, Tokyo 192-0397, Japan. Electronic address: suzuki-yaeko@ed.tmu.ac.jp. 2. Institute for Research on Earth Evolution, Japan Agency for Marine-Earth Science and Technology, 2-15 Natushima-Cho, Yokosuka 237-0061, Japan. 3. Department of Chemistry, Tokyo Metropolitan University, 1-1 Minami-Ohsawa, Hachioji, Tokyo 192-0397, Japan.
Abstract
We determined carbon and nitrogen contents (C and N contents) and stable carbon, nitrogen, and oxygen isotopic compositions (δ(13)C, δ(15)N, and δ(18)O) of polished rice in order to develop a simple method to discriminate its geographical origin. As a first attempt, we examined a single cultivar, Koshihikari rice, from 14 different cultivation areas including Australia (n=1), Japan (n=12), and USA (n=1). For all rice samples, C and N contents and the isotopic compositions are consistent with those of general plant materials, being 37.2-40.0% (C content), 0.8-1.4% (N content), -27.1 to -25.4% (δ(13)C), +0.4 to +9.0% (δ(15)N), and +18.8 to +22.9% (δ(18)O). However, its cultivated area is clearly distinguished by a pentagonal radar plot based on the elemental and isotopic compositions. Thus, the comparison of C and N contents and δ(13)C, δ(15)N, and δ(18)O values would potentially be useful for rapid and routine discrimination of geographical origin of the polished rice.
We determined carbon and n class="Chemical">nitrogen contents (C and N contents) and stable carbon, nitrogen, and oxygen isotopic compositions (δ(13)C, δ(15)N, and δ(18)O) of polished rice in order to develop a simple method to discriminate its geographical origin. As a first attempt, we examined a single cultivar, Koshihikari rice, from 14 different cultivation areas including Australia (n=1), Japan (n=12), and USA (n=1). For all rice samples, C and N contents and the isotopic compositions are consistent with those of general plant materials, being 37.2-40.0% (C content), 0.8-1.4% (N content), -27.1 to -25.4% (δ(13)C), +0.4 to +9.0% (δ(15)N), and +18.8 to +22.9% (δ(18)O). However, its cultivated area is clearly distinguished by a pentagonal radar plot based on the elemental and isotopic compositions. Thus, the comparison of C and N contents and δ(13)C, δ(15)N, and δ(18)O values would potentially be useful for rapid and routine discrimination of geographical origin of the polished rice.
Authors: Luiz A Martinelli; Gabriela B Nardoto; Maria A Z Perez; Geraldo Arruda Junior; Fabiana C Fracassi; Juliana G G Oliveira; Isadora S Ottani; Sarah H Lima; Edmar A Mazzi; Taciana F Gomes; Amin Soltangheisi; Adibe L Abdalla Filho; Eduardo Mariano; Fabio J V Costa; Paulo J Duarte-Neto; Marcelo Z Moreira; Plinio B Camargo Journal: Molecules Date: 2020-03-24 Impact factor: 4.411