Eco-friendly production of aunps and their impact on the oil oxidative stability
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2021
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Vegetable oils have been used for different applications and, more recently, as an active host
medium to obtain nanoparticles for employment in bionanotechnological applications. Nevertheless,
oils are very susceptible to oxidation during production, storage, and transportation because of their
chemical composition. Consequently, any modification in their production must be accompanied
by an analysis of the oxidative stability. In this study, naked and biocompatible gold nanoparticles
(AuNPs) were grown on sunflower oil during sputtering deposition using different deposition
times. Size and morphology were determined by transmission electron microscopy (TEM) and their
concentrations were found by inductively coupled plasma-optical emission spectroscopy (ICP-OES).
Rancimat® method was employed to evaluate the AuNPs influence on the oxidative stability of
the vegetable oil. Well-dispersed quasi-spherical NPs were produced with a mean diameter in the
2.9–3.7 nm range and they were concentration-dependent on the deposition time. A concentration
of about 11 mg/L, 38 mg/L, and 225 mg/L of AuNPs was obtained for a deposition time of 5 min,
15 min, and 30 min, respectively. The results also revealed that AuNPs negatively affected the
oxidative stability of the sunflower oil and exponentially reduced the induction period (IP) with the
increase in AuNPs content. IP reductions of 63%, 77%, and 81% were determined for the AuNPs
containing samples at 11 mg/L, 38 mg/L, and 225 mg/L. For the first time, it is reported that naked
AuNPs promote the rapid degradation of vegetable oil and this points out the need for attention
relative to the quality of vegetable oils used to host metal nanoparticles.
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Gold nanoparticle, Rancimat, Vegetable oil, Sunflower, Oxidative stability
Citação
MICHELS,Flávio S.; GONÇALVES, , Pablo J.; NASCIMENTO, Valter A.; OLIVEIRA, Samuel L.; WENDER, Heberton; CAIRES, Anderson R. L. Eco-friendly production of aunps and their impact on the oil oxidative stability. Nanomaterials, Basel, v. 11, n. 7, e1668, 2021. DOI: 10.3390/nano11071668. Disponível em: https://pubmed.ncbi.nlm.nih.gov/34201924/. Acesso em: 4 maio 2023.