期刊
FOOD CHEMISTRY
卷 283, 期 -, 页码 305-314出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.foodchem.2018.12.129
关键词
Organic rice; Pesticide-free rice; Conventional rice; Compound-specific isotope analysis; Chemometric model
资金
- Basic Science Research Program through the National Research Foundation of Korea (NRF), South Korea - Ministry of Education, Science and Technology [NRF-2017R1D1A1A09000572]
- Ministry of Science, ICT and Future Planning [NRF-2017R1E1A1A01075282]
Herein, we improve the procedure for organic rice authentication using compound-specific delta C-13 and delta N-15 analyses of fatty acids and amino acids, addressing the increasing demand for accurate methods to confirm organic authenticity. Organic rice (OR) and pesticide-free rice (PFR) featured higher values of delta N-15(bulk) than conventional rice (CR), whereas the corresponding differences between OR and PFR were insignificant. Additionally, OR, PFR, and CR could be discriminated based on some delta C-13(amino-acid) and delta N-15(amino-acid) values. delta C-13(bulk) was correlated with most delta C-13(fatty-acid) (r >= 0.596) values, and delta N-15(bulk) was strongly correlated with most delta N-15(amino-acid) (r >= 0.834) values. The first component in the orthogonal projection to latent structure-discriminant analysis model allowed for a clear separation between OR and PFR, and good predictability (Q(2)Y = 0.506). Thus, the present study improves the reliability of organic authentication when bulk stable isotope ratio analysis alone is insufficient for the accurate discrimination of OR, PFR, and CR.
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