Capacidade antioxidante em resíduos da indústria cafeeira

Abstract

ResumoEste trabalho teve como objetivo a recuperação de compostos fenólicos a partir de resíduos da indústria cafeeira e a avaliação de sua capacidade antioxidante. Os resíduos (casca, polpa e borra de café) foram obtidos de diferentes etapas do processamento industrial do café. Os extratos fenólicos foram obtidos usando-se uma mistura de acetona e água. O teor de compostos fenólicos variou entre 72,88 e 159,50 mg AG g -1 resíduo. Mediante cromatografia líquida de alta eficiência foi detectado e quantificado o ácido clorogênico na casca e na polpa de café. Foi avaliada a capacidade antioxidante dos extratos fenólicos, verificando-se sua capacidade sequestrante de radicais DPPH e sua ação redutora sobre radicais peroxila. O resíduo com maior capacidade antioxidante foi a casca de café. Esses resultados sugerem a possibilidade de reutilização dos resíduos da indústria do café para a obtenção de compostos antioxidantes, pois tais compostos têm inúmeras aplicações nas áreas de alimentos, cosméticos e farmacêutica. Palavras-chave: Resíduos de café; Compostos fenólicos; Ácido clorogênico; Radical livre DPPH; Radical peroxila. SummaryThe aim of this study was to recover the phenolic compounds from coffee industry residues and evaluate their antioxidant capacity. The residues (husk, pulp and spent coffee) were obtained from different steps of the industrial processing of coffee. The phenolic extracts were obtained using a mixture of acetone and water and the phenolic compound contents ranged between 72.88 and 159.50 mg GA g -1 residue. Chlorogenic acid was detected and quantified in the coffee husk and pulp by high performance liquid chromatography (HPLC). The antioxidant capacity of the phenolic extracts was evaluated and they showed DPPH radical scavenging ability and reducing action against peroxyl radicals. The residue with the highest antioxidant capacity was the coffee husk. The results suggest the possibility of reusing the coffee industry residues to obtain antioxidant compounds, since these compounds have numerous applications in the food, cosmetic and pharmaceutical industries.

Obtaining Bioactive Compounds from the Coffee Husk (Coffea arabica L.) Using Different Extraction Methods

“…The values found in this test were superior (260 times) to those found by García and Bianchi [10], who presented 23.1% in acetonic extract of the dehydrated husk of robusta coffee. Variations in antioxidant activity values found in the literature may be associated to the variety of the raw material, solvents, and extraction methods used [23].…”

“…Bioactive compounds are widely studied and widely found in plant sources, in particular phenolic compounds, which can have numerous applications in science and the food industry [9]. According to García and Bianchi [10], phenolic compounds constitute one of the main classes of antioxidants from natural sources, being distributed in leaves, seeds, grains, roots, and bark. In addition to the antioxidant activity as technological application, the presence of these compounds has been attributed to benefits in human health by delaying or preventing the appearance of diseases due to the antioxidant action in the organism, as well as anti-inflammatory, antimicrobial, and anti-allergic actions.…”

Antioxidant Activity of Spent Coffee Ground Extracts Toward Soybean Oil and Fish Oil

“…As shown in Table , the EE had the highest TPC (80.36 ± 0.93 mg GAE/g) followed by the AE (51.79 ± 1.63 mg GAE/g) and then PCO (16.44 ± 0.60 mg GAE/g). Palomino García and Del Bianchi reported TPC ranging from 72.88 to 159.50 mg/GA with the extract obtained using a mixture of acetone and water. Others reported somewhat lower TPC, for example, 16 mg g −1 with 60% methanol, 17.75–21.56 mg g −1 with aqueous ethanol, 42.0 mg g −1 with ethanol, and 28.1 mg g −1 with hot water .…”

“…However, there is still a lack of information for practical application of SCG extracts. Most previous studies focused on the radical scavenging ability such as Folin‐Ciocalteu (FC) assay, ABTS assay, DPPH, the polyphenol content, and hydroperoxides for the estimation of antioxidant activity of coffee spent extracts and their derivatives . For the practical application of these extracts, in addition to these assessments, primary and secondary oxidation products from oil should be analyzed after a period of storage.…”

Antimicrobial Potential and Chemical and Bioactive Compounds in Agroindustrial by-Products From Peach/ Potencial Antimicrobiano E Compostos Químicos E Bioativos Em Subprodutos Agroindustriais De Pêssego

“…They c a n contain vitamins, minerals, fibers, and in some cases antioxidant and antimicrobial compounds (Padinha & Basso, 2015). Moreover, the direct exposure of the waste generated by the agroindustry to the environment represents one of the main causes of environmental pollution, in addition to a loss of biomass that could be used for the production or recovery of different metabolites with commercial value (Filho & Franco, 2015;García & Del Bianchi, 2015).…”