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

Francisco Senna Vieira, Celio Pasquini

Research output: Contribution to journalArticleScientificpeer-review

12 Citations (Scopus)

Abstract

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 2900nm, 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 2900nm. 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 (R2=0.81).

Original languageEnglish
Pages (from-to)101-107
JournalAnalytica Chimica Acta
Volume796
DOIs
Publication statusPublished - 24 Sep 2013
MoE publication typeA1 Journal article-refereed

Keywords

  • Autoxidation
  • Edible oil
  • Instrumentation
  • Near infrared emission photometer
  • Oxidative stability

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