Study of the Antioxidant Power of the Waste Oil from Palm Oil Bleaching Clay

Katiane Cunha de Melo, Ingrid Silva de Oliveira, Luiza Helena de Oliveira Pires, Luís Adriano Santos do Nascimento, José Roberto Zamian, Geraldo Narciso da Rocha Filho, Marcele Fonseca Passos, Alessandra Santos Lopes, Attilio Converti and Carlos Emmerson Ferreira da Costa
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Katiane Cunha de Melo: Laboratory of Oils of the Amazon, Federal University of Pará, Pará 66075-110, Brazil
Ingrid Silva de Oliveira: Laboratory of Oils of the Amazon, Federal University of Pará, Pará 66075-110, Brazil
Luiza Helena de Oliveira Pires: School of Application, Federal University of Pará, Pará 66077-585, Brazil
Luís Adriano Santos do Nascimento: Laboratory of Oils of the Amazon, Federal University of Pará, Pará 66075-110, Brazil
José Roberto Zamian: Laboratory of Oils of the Amazon, Federal University of Pará, Pará 66075-110, Brazil
Geraldo Narciso da Rocha Filho: Laboratory of Oils of the Amazon, Federal University of Pará, Pará 66075-110, Brazil
Marcele Fonseca Passos: Laboratory of Oils of the Amazon, Federal University of Pará, Pará 66075-110, Brazil
Alessandra Santos Lopes: Laboratory of Science, Technology and food Engineering, Federal University of Pará, Pará 66075-110, Brazil
Attilio Converti: Department of Civil, Chemical and Environmental Engineering, University of Genoa, I-16145 Genoa, Italy
Carlos Emmerson Ferreira da Costa: Laboratory of Oils of the Amazon, Federal University of Pará, Pará 66075-110, Brazil

Energies, 2020, vol. 13, issue 4, 1-13

Abstract: Palm oil is one of the most consumed oils, one of whose refining steps is the removal of pigments and other substances using bleaching clay as adsorbent. Worldwide production of this oil was 70 million tons in 2017, requiring 1 t of clay to produce 1000 t of refined oil. The residual bleaching clay, having an oil fraction (12.70%) rich in phenolics, carotenoids and tocopherols, was extracted in this study with ethanol to obtain an antioxidant-rich palm oil bleaching extract (POBE), with the aim of using it as a natural antioxidant source. The POBE antioxidant capacity determined by the DPPH method corresponded to a 20.29% inhibition of radical formation. The POBE was also tested for its potential to enhance oxidative stability of passion fruit, pracaxi and Brazil nut oils used as reference oils, and compared to common synthetic antioxidants (tert-butylhydroquinone and propyl gallate), either separately as controls or in mixtures with them. Besides the increased oxidative stability of these oils induced by the POBE, a positive synergistic effect between it and the synthetic antioxidants was observed. These results taken together suggest that the exploitation of the waste oil from bleaching clay as an additive to improve the oxidative stability of biofuels or lubricating oils is feasible.

Keywords: esmectite; residual bleaching clay; amazonian vegetable oils; bioactive compounds antioxidant; phenolic compounds; oxidation stability (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
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