Monitoring the authenticity of organic rice via chemometric analysis of elemental data

Author(s)

Borges, Endler Marcel ; Lafayette Neves Gelinski, Jane Mary ; de Oliveira Souza, Vanessa Cristina ; Barbosa, Fernando, Jr. ; Batista, Bruno Lemos

• Document type: Journal article
• Source: Food Research International; v. 77, p. 11-pg., 2015-11-01.

Abstract

50 rice samples (18 organic and 32 ordinary) from Brazil were analyzed with inductively coupled plasma mass spectrometry (ICP-MS) for 20 elements (As, B, Ba, Ca, Cd, Ce, Co, Cr, Cu, Fe, K, La, Mg, Mn, Mo, P, Pb, Rb, Se and Zn) to identify significant differences between the two types (organic and ordinary) of rice. Concentrations of As, B, Ba, Co, Cr, Cu, Mn, P and Zn were found to be higher in ordinary versus organic rice, while K, Ca, Mo, Rb and Se concentrations were lower in ordinary versus organic samples. The remaining investigated elements (Cd, Ce, Fe, La, Mg and Pb) exhibited statistically equivalent concentration in the two types of rice. Principal Component Analysis (PCA), Soft Independent Modeling of Class Analogy (SIMCA), Hierarchical Cluster Analysis (HCA) and K-nearest neighbors (KNN) statistical techniques of the elemental fingerprints were readily able to discriminate organic from ordinary samples and can be used as alternative methods for adulteration evaluation. (C) 2015 Elsevier Ltd. All rights reserved. (AU)

• FAPESP's process: 10/07566-1 - Development of rapid methods for sample preparation and chemical speciation of arsenic in foods by LC-ICP-MS and evaluation of metabolism and concentration in rice
• Grantee: Bruno Lemos Batista
• Support Opportunities: Scholarships in Brazil - Doctorate
• FAPESP's process: 12/03746-0 - Study of arsenic metabolism in vitro by fungus from the rice´s rizosphere (Oryza sativa L.) and application for the study of plant behavior during cultivation
• Grantee: Bruno Lemos Batista
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• FAPESP's process: 12/03465-1 - Novel methodology for the analysis of high-molecular weight polycyclic aromatic hydrocarbons in water and particulate matter samples based on Shpol'skii spectroscopy
• Grantee: Fernando Barbosa Júnior
• Support Opportunities: Regular Research Grants
• FAPESP's process: 12/22663-9 - Isolation, identification and evaluation of arsenic resistance of fungi from the rhizosphere of rice (Oryza sativa L.)
• Grantee: Camila Veronez Barião
• Support Opportunities: Scholarships in Brazil - Scientific Initiation