Abstract
BackgroundIn the present study, tara seed oil was obtained by supercritical fluid extraction and used to investigate the antioxidant strength of carnosic acid (CA) compared with conventional synthetic antioxidants.MethodsThe antioxidants were added to the tara seed oil at 0.2 mg of antioxidant per gram of oil. The samples were then submitted to at 60 °C 15 days for an accelerated oxidation process, with samples taken regularly for analysis. After oxidation, the samples were analyzed to determine the peroxide value, thiobarbituric acid reactive substances, conjugated diene content, and free fatty acid content. CA was investigated at three purity levels (CA20, CA60, CA99), and compared with three synthetic antioxidants (butylatedhydroxyanisole, butylatedhydroxytoluene, and tert-butylhydroquinone).ResultsThe oxidation indicators showed that CA was a strong antioxidant compared to the synthetic antioxidants. The antioxidant activities decreased in the order: tert-butylhydroquinone > CA99 > CA60 > CA20 > butylatedhydroxyanisole > butylatedhydroxytoluene. These results show that CA could be used to replace synthetic antioxidants in oil products, and should be safer for human consumption and the environment.
Highlights
As an important plant tannis, tara (Caesalpiniaspinosa) is a kind of precious tree which represents significantly economic benefit, ecological benefit and social benefit
Materials Refined, bleached, and deodorized tara seed oil was obtained by Supercritical Fluid Extraction from tara powder (60 mesh) prepared from fresh tara seeds (Wonderful variety) that were collected from Yunnan Province, China in September, 2014
The peroxide value (PV) for each tara seed oil increased as the length of storage increased, which resulted in production of more primary oxidation products
Summary
As an important plant tannis, tara (Caesalpiniaspinosa) is a kind of precious tree which represents significantly economic benefit, ecological benefit and social benefit. Oil extracted from tara seeds has high content of unsaturated fatty acids. In recent years, it has received extensive attention among researchers [1]. Exposure of tara seed oil to high temperatures and light can result in oxidation and increase the peroxide value (PV), which makes the oil unpalatable [6, 7]. It can be used to determine the degree of lipid oxidation and deterioration, and is mainly used to measure the formation of lipid oxidation products in initial stages of oxidation It provides a measure of the degree of oil rancidity, and a higher PV is generally indicative of a higher the degree of rancidity. Tara seed oil was obtained by supercritical fluid extraction and used to investigate the antioxidant strength of carnosic acid (CA) compared with conventional synthetic antioxidants
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