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

Autor: 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, Carlos Emmerson Ferreira da Costa
Jazyk: angličtina
Rok vydání: 2020
Předmět:
Zdroj: Energies, Vol 13, Iss 4, p 804 (2020)
Druh dokumentu: article
ISSN: 1996-1073
13040804
DOI: 10.3390/en13040804
Popis: 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.
Databáze: Directory of Open Access Journals
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