Navegando por Autor "Magalhaes, Emilianny Rafaely Batista"

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Effect of oil extraction on the composition, structure, and coagulant effect of Moringa oleifera seeds
(Elsevier, 2021-01-10) Santos, Everaldo Silvino dos; Magalhaes, Emilianny Rafaely Batista; Menezes, Nadja Nayara Fonseca de; Silva, Francinaldo Leite; Garrido, Jose Wagner Alves; Sousa, Magna Angélica dos Santos Bezerra
Moringa oleifera seeds contain cationic proteins that can be used for water and wastewater treatment; furthermore, the oil content of Moringa oleifera seeds is high, and the properties of this oil render it useful for many applications. In this study, it was investigated the effects of oil extraction on the structure, composition, and coagulant activity of Moringa oleifera seeds, and aimed to add value to the seed waste generated after oil extraction. The results revealed that the content of fatty acids and phenolic and aromatic compounds of the seeds decreased after oil extraction. However, the proteins, including those with coagulant properties, were retained in the oil-extracted seeds. Oil extraction increased the operating pH range of the natural flocculant derived from Moringa oleifera seeds from below 4.8 for the flocculant derived from oil-containing Moringa oleifera (M1) seeds to below 9.8 for the flocculant derived from oil-extracted Moringa oleifera (M2) seeds. Furthermore, the performance of the M1 and M2 seeds for water treatment via coagulation followed by dissolved air flotation was not significantly different, and their mean oil and grease removal efficiency was approximately 82.43 ± 0.70%. These results confirmed the promising use of Moringa oleifera seed waste for the removal of oil and grease from wastewater as a more affordable, sustainable, and natural alternative to commercial flocculants. In addition, the concomitant use of both the extracted oil and seed waste generated after oil extraction was facilitated. More studies should be performed to assess whether the performance of the M1 and M2 seed-derived flocculants could be improved at the pH values we determined to be optimal for the purification of the protein of interest, viz. 9.5 and 4.0, respectively.
Valorization of an agroextractive residue—Carnauba straw—for the production of bioethanol by simultaneous saccharification and fermentation (SSF)
(Elsevier, 2018-11) Santos, Everaldo Silvino dos; Silva, Francinaldo Leite da; Campos, Alan de Oliveira; Santos, Davi Alves dos; Magalhaes, Emilianny Rafaely Batista; Macedo, Gorete Ribeiro de
In this study, the use of carnauba straw residue to produce cellulosic ethanol by simultaneous saccharification and fermentation (SSF) with three industrial yeasts was investigated. Hydrothermal (HT), alkaline (AL), and acidealkaline (AA) pretreatments were carried out on the residues, and the efficiency of the enzymatic hydrolysis of these residues was evaluated. The SSF was performed using Saccharomyces cerevisiae UFLA CA11, Saccharomyces cerevisiae CAT-1, and Kluyveromyces marxianus ATCC-36907 at 35, 40, and 45 C. The AL pretreatment resulted in the best removal of lignin and hemicellulose. In addition, enzymatic hydrolysis of the dry residue treated with AL converted 64.43% of the lignocel-lulosic biomass to sugars. SSF of the AL-pretreated residue using Kluyveromyces marxianus ATCC-36907 cultivated at 45 C produced 7.53 g/L ethanol

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Navegando por Autor "Magalhaes, Emilianny Rafaely Batista"