Cocos nucifera Linn. (Palmae) Husk Fiber Ethanolic Extract: Antioxidant Capacity and Electrochemical Investigation

Cocos nucifera Linn. (Palmae) Husk Fiber Ethanolic Extract: Antioxidant Capacity and Electrochemical Investigation

Author Oliveira, Monika Bezerra dos Santos Google Scholar
Valentim, Iara Barros Google Scholar
Vasconcelos, Camila Calado de Google Scholar
Omena, Cristhiane Maria Bazilio Google Scholar
Bechara, Etelvino José Henriques Autor UNIFESP Google Scholar
Costa, Joao Gomes da Google Scholar
Freitas, Mikael de Lima Google Scholar
Sant'Ana, Antonio Euzebio Goulart Google Scholar
Goulart, Marilia Oliveira Fonseca Google Scholar
Institution Univ Fed Alagoas UFAL
Univ Pernambuco UPE
Universidade de São Paulo (USP)
Universidade Federal de São Paulo (UNIFESP)
Empresa Brasileira de Pesquisa Agropecuária (EMBRAPA)
Abstract The present study aims to determine the antioxidant capacity of the ethanolic extracts of husk fiber of four coconut (Cocos nucifera L.) varieties (yellow dwarf, green dwarf, giant and hybrid) and to evaluate the electrochemical behavior of these extracts on a glassy carbon electrode and on a modified glassy carbon electrode. The highest values of total phenolic content were obtained for the hybrid (531 +/- 24 mg GAE g(-1) dry extract) and yellow dwarf (501 +/- 29 mg GAE g(-1) dry extract) varieties and the lowest was for the green dwarf variety with 58 +/- 9 mg GAE g(-1) dry extract. The ability of the extracts to scavenge DPPH center dot radicals was in the order of giant > yellow dwarf > hybrid > green dwarf and the IC50 values varied from 8.6 to 55.9 mu g mL(-1). All varieties showed reducing potential by the use of FRAP and CUPRAC methods, with the lowest performance obtained for the green dwarf variety. Additionally, through the use of mimetic biomembranes, ethanolic extracts of coconut husk were shown to protect lipids against oxidative damage independent of the variety. The main antioxidants identified in the extract of yellow dwarf variety by UPLC-MS were quercetin and catechin. Cyclic voltammetric studies of the ethanolic extracts on glassy carbon electrode confirmed the presence of easily oxidized compounds, and the high antioxidant capacity of the varieties. This capacity was expressed as mg quercetin equivalents g(-1) dry extract and ranged from 25.9 up to 53.5 mg QE g(-1). A poly-xanthurenic acid (poly-Xa)/multi-walled carbon nanotube (MWCNT) / glassy carbon modified electrode (poly-Xa/MWCNT/GCE) was used for this purpose. Our findings suggest that these extracts are potentially important antioxidant supplements for the everyday human diet, pharmaceutical and cosmetic industries, thereby aggregating value to the enormous amount of waste from the coconut industry, mostly used for burning purposes.
Keywords Antioxidant capacity
Cocos nucifera
cyclic voltammetry
electrochemical behavior
poly-xanthurenic acid/MWCNT modified electrode
Language English
Sponsor Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
Date 2013-02-01
Published in Combinatorial Chemistry & High Throughput Screening. Sharjah: Bentham Science Publ Ltd, v. 16, n. 2, p. 121-129, 2013.
ISSN 1386-2073 (Sherpa/Romeo, impact factor)
Publisher Bentham Science Publ Ltd
Extent 121-129
Access rights Closed access
Type Article
Web of Science ID WOS:000317050800006

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