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Photonics 2017, 4(1), 3; doi:10.3390/photonics4010003

Optical Analysis of the Oils Obtained from Acrocomia aculeata (Jacq.) Lodd: Mapping Absorption-Emission Profiles in an Induced Oxidation Process

1
Faculdade de Ciências Exatas e Tecnologia, Universidade Federal da Grande Dourados, 79804-970 Dourados-MS, Brazil
2
Grupo de Óptica e Fotônica, Instituto de Física, Universidade Federal de Mato Grosso do Sul, 79070-900 Campo Grande-MS, Brazil
*
Author to whom correspondence should be addressed.
Received: 29 November 2016 / Revised: 29 December 2016 / Accepted: 4 January 2017 / Published: 6 January 2017
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Abstract

Acrocomia aculeata is a palm tree typical of the Brazilian savanna. Oils extracted from the pulp and kernel of Acrocomia aculeata fruits have gained considerable attention mainly due to their nutritional and medicinal features. Despite their potential applications, a detailed analysis of their oxidative stability is still needed. The present study shows a close analysis of the oxidative stability of the oils obtained from the kernel and pulp of Acrocomia aculeata fruits, evaluating the influence of the intrinsic antioxidants and the fatty acid composition on the oil’s thermal stability. A complete characterization of the physical-chemical and optical properties of the oils was performed. The results showed that 66% of the fatty acids present in the pulp oil are unsaturated, while 75% are saturated in the kernel oil. A higher content of intrinsic antioxidants was obtained in the pulp oil, and an induction period (at 110 °C) of 65 and 43 h was determined for the pulp and kernel oil, respectively. Additionally, oil absorption increases due to the formation of degradation products, and a new fluorescent compound was formed during the oil oxidation process at 110 °C. Even though the pulp presented a high content of unsaturated fatty acids, the pulp oil was more stable than the kernel oil due to its higher content of intrinsic antioxidant, especially carotenoids. The results also demonstrated that oil oxidation can be optically determined by analyzing the absorption at 232 and 270 nm, as well as the emission at 424 nm. View Full-Text
Keywords: Acrocomia aculeata (Jacq.) Lodd.; oxidative stability; oil degradation; UV-Vis absorption; fluorescence Acrocomia aculeata (Jacq.) Lodd.; oxidative stability; oil degradation; UV-Vis absorption; fluorescence
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

de Oliveira, I.P.; Correa, W.A.; Neves, P.V.; Silva, P.V.B.; Lescano, C.H.; Michels, F.S.; Passos, W.E.; Muzzi, R.M.; Oliveira, S.L.; Caires, A.R.L. Optical Analysis of the Oils Obtained from Acrocomia aculeata (Jacq.) Lodd: Mapping Absorption-Emission Profiles in an Induced Oxidation Process. Photonics 2017, 4, 3.

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