Stable isotope ratio of local rice samples in Thailand

Abstract

Stable isotopes including 13 C, 15 N and 18 O of local Thai rice samples were carried out using elemental analyzer isotope ratio mass spectrometry (EA-IRMS). Thai rice samples, Khaowong sticky rice, Pakaumpul local rice, and Jek Chuey Sao Hai rice were cultivated from Kalasin, Surin, and Saraburi provinces, respectively. In this study, we report the stable isotope ratio of rices for the isotopic characteristics of Thai rice cultivated from different provinces. The analysis of variance (ANOVA) and multiple comparisons using Least significant difference (LSD) were also investigated. Stable isotope ratio of 13 C/ 12 C and 18 O/ 16 O were good characteristic indicators for Thai rice that could be applied for the geographical origins of rice.