Chemical composition, antioxidant activity and thermal analysis of oil extracted from favela (Cnidoscolus quercifolius) seeds
2017
Santos, Kátia Andressa | Filho, Octávio Pessoa Aragão | Aguiar, Caroline Mariana | Milinsk, Maria Cristina | Sampaio, Sílvio César | Palú, Fernando | da Silva, Edson Antônio
Favela (Cnidoscolus quercifolius) is a plant native to the Brazilian Caatinga biome that is extremely tolerant to drought. Although favela has seeds that are rich in oil, being considered as a potential alternative for edible oil production, little information has been found regarding its characterization. In this context, this study aimed to determine the fatty acid profile of the oil extracted from favela seeds and its tocopherol, phytosterol and total phenolic contents. Moreover, its antioxidant potential and thermal and oxidative stability were also determined. The results showed that the seeds had 35.20% lipid, consisting mainly of unsaturated fatty acids, notably linoleic acid (54.39%) and oleic acid (20.13%). The α-, δ- and γ-tocopherols were present at 0.87, 3.15 and 15.09mg 100goil−1, respectively. The phytosterol, β-sitosterol, was found at 127.98mg 100goil−1, while phenolic compounds were detected at 23.88mg gallic acid equivalent 100goil−1. The oil presented high antioxidant activity, decreasing DPPH radicals by 76.68%, which was equivalent to 3.83mmol Trolox kgoil−1 by the ABTS assay. Thermogravimetric analysis showed that the triglycerides started degrading at 188°C. The oil showed high oxidative stability and an induction time of 265.3min at 110°C.
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