Tracing the Geographical Origin of Thai Hom Mali Rice in Three Contiguous Provinces of Thailand Using Stable Isotopic and Elemental Markers Combined with Multivariate Analysis
Abstract
:1. Introduction
2. Materials and Methods
2.1. Sample Preparation of THMR
2.2. Chemicals and Reference Materials
2.3. ICP-MS
2.4. Stable Oxygen (O) Isotope by EA-IRMS in Pyrolyzer Mode
2.5. Multivariate Analysis
3. Results and Discussion
3.1. Stable Isotope and Selected Elemental Analyses in THMR
3.1.1. δ18O Analysis
3.1.2. Elemental Analysis
3.2. Radar Plot Analysis
3.3. LDA
4. Conclusions
Supplementary Materials
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Stable Isotope (‰)/Element (mg kg−1) | Province of Thai Hom Mali Rice Origin 1 | |||||
---|---|---|---|---|---|---|
YP (n =7) | RP (n = 16) | SP (n = 5) | ||||
Average | RSD 2 | Average | RSD | Average | RSD | |
δ18O | 25.48 a | 0.018 | 25.42 a | 0.03 | 24.20 b | 0.018 |
Mn | 17.71 c | 0.26 | 12.74 d | 0.23 | 12.82 cd | 0.10 |
Co | 0.085 e | 0.89 | 0.039 f | 2.03 | 0.033 ef | 0.45 |
Rb | 8.72 g | 0.34 | 4.30 h | 0.22 | 4.19 h | 0.28 |
Mo | 0.55 i | 0.25 | 0.49 ij | 0.32 | 0.32 j | 0.34 |
Classification | YP | RP | SP | Overall |
---|---|---|---|---|
LDA (%) | Elemental composition only | |||
85.7 | 75.0 | 100.0 | 82.1 | |
Cross-validated | 71.4 | 75.0 | 80.0 | 75.0 |
LDA (%) | Combination of elemental and stable isotope compositions | |||
85.7 | 100.0 | 100.0 | 96.4 | |
Cross-validated | 71.4 | 100.0 | 100.0 | 92.9 |
Origin | Prediction in 3 Provincial Origins | |||||
---|---|---|---|---|---|---|
YP | RP | SP | Total | |||
Classification | count | YP | 6 | 1 | 0 | 7 |
RP | 0 | 16 | 0 | 16 | ||
SP | 0 | 0 | 5 | 5 | ||
% | YP | 85.7 | 14.3 | 0.0 | 100.0 | |
RP | 0.0 | 100.0 | 0.0 | 100.0 | ||
SP | 0.0 | 0.0 | 100.0 | 100.0 | ||
Cross-validated | count | YP | 5 | 1 | 1 | 7 |
RP | 0 | 16 | 0 | 16 | ||
SP | 0 | 0 | 5 | 5 | ||
% | YP | 71.4 | 14.3 | 14.3 | 100.0 | |
RP | 0.0 | 100.0 | 0.0 | 100.0 | ||
SP | 0.0 | 0.0 | 100.0 | 100.0 |
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Kongsri, S.; Sricharoen, P.; Limchoowong, N.; Kukusamude, C. Tracing the Geographical Origin of Thai Hom Mali Rice in Three Contiguous Provinces of Thailand Using Stable Isotopic and Elemental Markers Combined with Multivariate Analysis. Foods 2021, 10, 2349. https://doi.org/10.3390/foods10102349
Kongsri S, Sricharoen P, Limchoowong N, Kukusamude C. Tracing the Geographical Origin of Thai Hom Mali Rice in Three Contiguous Provinces of Thailand Using Stable Isotopic and Elemental Markers Combined with Multivariate Analysis. Foods. 2021; 10(10):2349. https://doi.org/10.3390/foods10102349
Chicago/Turabian StyleKongsri, Supalak, Phitchan Sricharoen, Nunticha Limchoowong, and Chunyapuk Kukusamude. 2021. "Tracing the Geographical Origin of Thai Hom Mali Rice in Three Contiguous Provinces of Thailand Using Stable Isotopic and Elemental Markers Combined with Multivariate Analysis" Foods 10, no. 10: 2349. https://doi.org/10.3390/foods10102349