@article{Santos_Clara_Veronezi_Jorge_2021, title={Effect of Curcuma longa L. extract as a natural antioxidant in soybean oil}, volume={6}, url={https://diversitasjournal.com.br/diversitas_journal/article/view/1817}, DOI={10.17648/diversitas-journal-v6i2-1817}, abstractNote={<p> </p> <p><strong>ABSTRACT: </strong>This work aimed to evaluate the antioxidant potential of <em>Curcuma longa</em> L. extract in the oxidative stability of soybean oil. For this, the treatments Control (soybean oil), TBHQ<sub>100</sub> (soybean oil with 100 mg of TBHQ/kg), Extract<sub>100</sub> (soybean oil with 100 mg of β-carotene extract/kg) and TBHQ<sub>50</sub>+Extract<sub>50</sub> soybean oil with 50 mg of TBHQ/kg of soybean oil + 50 mg of β-carotene extract/kg) were submitted to the accelerated oven test (60 ºC/20 days). The extract presented 51.17% antioxidant activity by the DPPH<sup>•</sup> and 98.74 μM Trolox.g<sup>-1</sup> by FRAP, in addition to 457.9 μg β-carotene.g<sup>-1</sup>. Although all treatments showed low values of peroxide index (0.55-0.65 meq.kg<sup>-1</sup>) at 20 days, Control presented greater oxidative degradation, 46.15 meq.kg<sup>-1</sup>. TBHQ<sub>100</sub> and TBHQ<sub>50</sub>+Extract<sub>50</sub> had the lowest values of <em>p</em>-anisidine. Even though TBHQ<sub>100</sub> showed higher oxidative stability (8.25 h), TBHQ<sub>50</sub>+Extract<sub>50</sub> (6.41 h) showed greater stability than Control (3.86 h). All treatments presented high concentrations of the γ-tocopherol isomer. The synthetic antioxidant has proved to be more efficient in preventing the oxidation reaction than the natural antioxidant since it has a high degree of purity. However, TBHQ<sub>50</sub>+Extract<sub>50</sub> presented satisfactory results, being the second best treatment able to reduce the soybean oil alteration, allowing the application to reduce the concentration of the synthetic antioxidant.</p> <p><strong>KEYWORDS: </strong>Antioxidant activity, Carotenoids, Tocopherols.</p>}, number={2}, journal={Diversitas Journal}, author={Santos, Larissa da Rocha dos and Clara, Maria Paula Fortuna and Veronezi, Carolina Médici and Jorge, Neuza}, year={2021}, month={maio}, pages={1966–1979} }