Use of an Environmental Pollutant From Hexavalent Chromium Removal as a Green Catalyst in The Fenton Process.

The present study refers to the use of an environmental pollutant generated during the removal of hexavalent chromium from aqueous media. This pollutant is a material with catalytic properties suitable for application in the oxidative degradation of problematic organic compounds. The material, initially used as an adsorbent, is a composite prepared by modifying the crystalline phases of iron oxides together with the chitosan (CT-FeCr).

Chitosan-iron oxide hybrid composite: mechanism of hexavalent chromium removal by central composite design and theoretical calculations.

In this study, the synthesis of iron oxide stabilized by chitosan was carried out for the application and optimization in the removal process of aqueous Cr(VI) by central composite design (CCD). The calculation of these effects allowed to know, quantitatively, the variables and the interaction between them that could affect the Cr(VI) removal process. It was also verified that the most favorable conditions for chromium removal were the following: pH 5.

Antibacterial activity and in vivo wound healing potential of phenolic extracts from jaboticaba skin.

In this study, different phenolic extracts were obtained from the jaboticaba skin meal (JSM), whose phenolic compounds were characterized and their antibacterial activities were assessed. Moreover, the activity of lyophilized ethanolic extract of jaboticaba skin (EEJS) on wound healing was analyzed in rats. The JSM phenolic extracts were obtained in four ways: aqueous, methanolic, ethanolic, and acetone extracts.

Enzymatic oxidation of phenolic compounds in coffee processing wastewater.

Peroxidases can be used in the treatment of wastewater containing phenolic compounds. The effluent from the wet processing of coffee fruits contains high content of these pollutants and although some studies propose treatments for this wastewater, none targets specifically the removal of these recalcitrant compounds. This study evaluates the potential use of different peroxidase sources in the oxidation of caffeic acid and of total phenolic compounds in coffee processing wastewater (CPW).

Improvement of physiological parameters of rats subjected to hypercaloric diet, with the use of Pereskia grandifolia (Cactaceae) leaf flour.

Objective: The aim of the present study was to investigate the anti-obesity effects of Pereskia grandifolia leaf flour on rats fed a hypercaloric diet.

Methods: After a hypercaloric diet for 10 weeks, 21 animals were divided into the following groups and were fed the following diets for 4 weeks: control (CH), hypercaloric diet with P. grandifolia flour (PGF) 5%, and hypercaloric diet with PGF 10%.

Evaluation of the protective effect of chemical additives in the oxidation of phenolic compounds catalysed by peroxidase.

The use of oxidoredutive enzymes in removing organic pollutants has been the subject of much research. The oxidation of phenolic compounds in the presence of chemical additives has been the focus of this study. In this investigation, the influence of the additives polyethylene glycol and Triton X-100 was evaluated in the phenol oxidation, caffeic acid, chlorogenic acid and total phenolic compounds present in coffee processing wastewater (CPW) at different pH values, performed by turnip peroxidase and peroxidase extracted from soybean seed hulls.

Immobilized soybean hull peroxidase for the oxidation of phenolic compounds in coffee processing wastewater.

Chitosan beads were prepared, using glutaraldehyde as a crosslinking agent for the immobilization of soybean hull peroxidase (SBP). The activity of free and immobilized SBP was studied. The optimum pH was 6.

Cereal bars enriched with antioxidant substances and rich in fiber, prepared with flours of acerola residues.

In the processing for obtaining acerola juice, a large amount of residues, which is usually discharged, is generated (seeds and bagasse). Adding value to these by-products is of great interest, since their use can enrich human food as a good source of nutrients and dietary fiber. In this study, acerola seed flours (ASF) and acerola bagasse flours (ABF) were used to develop cereal bars (CB) in different combinations with brown oats: CB 1: control - with the addition of 25% brown oats, CB 2: with the addition of 12.

Combined experimental and theoretical study on the removal of pollutant compounds by peroxidases: affinity and reactivity toward a bioremediation catalyst.

Water pollution is a significant and growing problem throughout the world, especially in developing countries. In order to minimize environmental problems, catalysts have increasingly been designed to remove pollutants from the water. In an attempt to innovate by the creation of new low-cost alternatives to efficiently remove pollutants, the enzymatic treatment has been intensely studied for this purpose.

Obtention of plant peroxidase and its potential for the decolorization of the reactive dye Remazol Turquoise G 133%.

Peroxidases can be used in the decolorization process. There is a growing interest for new sources of this enzyme and for obtaining economically viable processes. In this work, a low-cost vegetable peroxidase extraction process is proposed; the resulting enzyme is characterized to determine its optimum pH, temperature, and stability conditions, and it is then applied in the decolorization of reactive dye Remazol Turquoise G 133%.

[Chemical characterization of the jabuticaba fruits (Myrciaria cauliflora Berg) and their fractions].

Jabuticaba, Myrciaria cauliflora Berg, is a native Brazilian fruit; very little is known about the chemistry of its components, specially the bioactives compounds. The purpose of this paper was to determine the centesimal composition and some bioactives compounds of the whole fruit and fractions of two varieties of jabuticaba (Paulista and Sabará). The experiment was conducted in a completely randomized design on a 4 x 2 x 3 factorial scheme (4 factors: whole fruit, skin, pulp and seed; 2 varieties: Paulista e Sabará, and 3 replicates).

[Chemical characterization of integral flour from the prosopis spp. of Bolivia and Brazil].

The mature fruits of three species of algarroba found in Bolivia (Prosopis chilensis (Molina) Stunz, P. alba Grisebach y P. nigra (Grisebach) Hieronymus) and of one of Brazil (P.