Near infrared emission photometer for measuring the oxidative stability of edible oils

Autor(es)

Vieira, Francisco Senna ^[1] ; Pasquini, Celio ^[2]

Afiliação do(s) autor(es)

^[1] State Univ Campinas UNICAMP. Inst Chem

^[2] State Univ Campinas UNICAMP. Inst Chem

• Tipo de documento: Artigo Científico
• Fonte: Analytica Chimica Acta; v. 796, p. 101-107, SEP 24 2013.
• Citações Web of Science: 2

Resumo

Near infrared emission spectroscopy (NIRES) allows the determination of the induction time (IT) of edible oils in accelerated oxidation experiments by monitoring the emissivity of a band at 2900 nm, which corresponds to the formation of hydroperoxides. In this work, a new near infrared emission photometer dedicated to the determination of oxidative stability is described. The photometer presents several advantages compared to the previously reported NIRES instrument, such as lower cost and extreme simplicity of design and maintenance. The results obtained in the evaluation of the proposed instrument were compared with the official Rancimat method and instrument. The significant advantages include: faster analysis, lower sample consumption and operational simplicity. It is demonstrated that the procedure for determination of oxidative stability of oils can be significantly simplified and performed by measuring the sample emission at only one spectral region centered at 2900 nm. Also, the proposed instrument and method present precision equivalent to the Rancimat method (coefficient of variation = 5.0%). A significant correlation between the methods has been found (R-2 = 0.81). (C) 2013 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 08/57808-1 - Instituto Nacional de Ciências e Tecnologias Analíticas Avançadas - INCTAA
• Beneficiário: Celio Pasquini
• Modalidade de apoio: Auxílio à Pesquisa - Temático