Optical Analysis of the Oils Obtained from Acrocomia aculeata (Jacq.) Lodd: Mapping Absorption-Emission Profiles in an Induced Oxidation Process
quinta-feira, junho 14, 2018
Authors: Ivan P. de Oliveira, Willian A. Correa, Priscila V. Neves, Perla V. B. Silva, Caroline H. Lescano, Flávio S. Michels, Wilson E. Passos, Rozanna M. Muzzi, Samuel L. Oliveira and Anderson R. L. Caires
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.
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