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Organic solvent fractionation of acetosolv palm oil lignin: The role of its structure on the antioxidant activity.
de Menezes Nogueira, Izabel; Avelino, Francisco; de Oliveira, Davi Rabelo; Souza, Nágila Freitas; Rosa, Morsyleide Freitas; Mazzetto, Selma Elaine; Lomonaco, Diego.
Afiliação
  • de Menezes Nogueira I; Department of Organic and Inorganic Chemistry, Federal University of Ceara, 60440-900 Fortaleza, CE, Brazil; Embrapa Agroindústria Tropical, Rua Dra Sara Mesquita 2270, Planalto do Pici, 60511-110 Fortaleza, CE, Brazil.
  • Avelino F; Department of Organic and Inorganic Chemistry, Federal University of Ceara, 60440-900 Fortaleza, CE, Brazil.
  • de Oliveira DR; Department of Organic and Inorganic Chemistry, Federal University of Ceara, 60440-900 Fortaleza, CE, Brazil.
  • Souza NF; Embrapa Agroindústria Tropical, Rua Dra Sara Mesquita 2270, Planalto do Pici, 60511-110 Fortaleza, CE, Brazil.
  • Rosa MF; Embrapa Agroindústria Tropical, Rua Dra Sara Mesquita 2270, Planalto do Pici, 60511-110 Fortaleza, CE, Brazil.
  • Mazzetto SE; Department of Organic and Inorganic Chemistry, Federal University of Ceara, 60440-900 Fortaleza, CE, Brazil.
  • Lomonaco D; Department of Organic and Inorganic Chemistry, Federal University of Ceara, 60440-900 Fortaleza, CE, Brazil. Electronic address: lomonaco@ufc.br.
Int J Biol Macromol ; 122: 1163-1172, 2019 Feb 01.
Article em En | MEDLINE | ID: mdl-30219507
Pressed palm oil mesocarp fibers (PPOMF) are by-products from oil palm industry and represents a potential source of lignocellulosic biomass. In order to add value to this agro-waste, dewaxed palm oil acetosolv lignin (DPOAL) was extracted under eco-friendly pulping method. The chemical composition and structural characteristics of DPOAL were investigated. The results showed elevated yield (48.5%) and high purity (94.3%), besides a moderate average molecular weight (1394 g mol-1) and narrow polydispersity index (1.88). Structural characterization via FT-IR, 1H13C HSQC and 31P NMR indicated that DPOAL was a typical HGS-type lignin. In addition, to increase the phenolic hydroxyl contents and improve DPOAL's antioxidant properties through a simple method, a fractionation process with methanol, ethanol and acetone was carried out, obtaining the methanol (MeOH-F), ethanol (EtOH-F) and acetone (ACT-F) soluble fractions. These were characterized by FT-IR, DSC, 1H13C HSQC and 31P NMR, which showed higher values of phenolic and aliphatic hydroxyls groups compared to DPOAL. The antioxidant activity was evaluated by the free radical scavenging activity of 2,2­diphenyl­1­picrylhydrazyl radicals (DPPH·) and compared with commercial antioxidants, such as BHT and Irganox 1010. Interestingly, lignin samples had significantly lower IC50 values compared to commercial antioxidants, what suggests a great potential as novel natural antioxidant.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Solventes / Óleo de Palmeira / Lignina / Antioxidantes Idioma: En Revista: Int J Biol Macromol Ano de publicação: 2019 Tipo de documento: Article País de afiliação: Brasil País de publicação: Holanda
Texto completo
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Solventes / Óleo de Palmeira / Lignina / Antioxidantes Idioma: En Revista: Int J Biol Macromol Ano de publicação: 2019 Tipo de documento: Article País de afiliação: Brasil País de publicação: Holanda