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vol.43 número7CONTRIBUTION OF ENZYMATIC METHOD FOR ANALYZING SUCROSE AND STARCH IN TRADITIONAL CHINESE LIME- AND EARTH-BASED MORTARSSYNTHESIS AND PHYTOTOXIC PROFILE OF A NEW TETRAOXANE DESIGNED FROM A COMMERCIAL AUXIN índice de autoresíndice de assuntospesquisa de artigos
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Química Nova

versão impressa ISSN 0100-4042versão On-line ISSN 1678-7064

Resumo

SANTOS, Priscilla C. et al. DETERMINATION OF THE AUTHENTICITY OF COMMERCIAL OLIVE OIL SAMPLES SEIZED IN THE ESPÍRITO SANTO STATE USING A PORTABLE SPECTROPHOTOMETER IN THE NIR REGION. Quím. Nova [online]. 2020, vol.43, n.7, pp.891-900.  Epub 21-Ago-2020. ISSN 1678-7064.  http://dx.doi.org/10.21577/0100-4042.20170550.

Many instrumental techniques are used to monitor the quality of food products, highlighting near infrared spectroscopy (NIRS). In order to determine the authenticity of 60 commercial oil samples seized by the Espírito Santo state police, this work used a portable spectrometer in the NIR region associated with chemometric tools such as principal component analysis (PCA) and partial least squares regression (PLS) to classify and quantify possible adulterants present such as soybean oil. In addition, physicochemical tests (acidity, peroxide and ultraviolet absorption) were carried out on commercial samples. The PLS regression model built to quantify soybean oil showed a coefficient of determination (R2) greater than 0.99, showing itself to be satisfactory. The results showed that all samples analyzed had a high content of adulterant and cannot be classified as extra virgin olive oil.

Palavras-chave : NIR; chemometrics; olive oil; soy oil.

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