Abstract
Sangyod rice is the geographical indication product of Phatthalung province in Thailand. In this work, the stable isotopic fingerprint of Sangyod rice samples was investigated using isotope ratio mass spectrometry. A total of fifty rice samples collected from ten districts in Phatthalung were analyzed for stable isotopic composition (δ13C, δ15N and δ18O). The range of δ13C, δ15N and δ18O values in rice samples was − 28.41 to − 26.81, + 3.06 to + 8.31 and + 23.46 to + 29.46‰, respectively. The highest mean δ13C value was observed for rice samples from Tamot whereas the lowest value was found for rice samples from Si Banphot. δ15N was highest in samples from Si Banphot and lowest in samples from Khao Chaison. Kong Ra showed the highest δ18O value. Pak Phayun had the lowest δ18O. Most Sangyod rice samples from Si Banphot can be distinguished from other cultivation areas by a scatter plot of isotopic values.
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