Percorrer por autor "Santos, Everton da Silva"
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- Chemical profile and bioactivities of industrial wastes from Chenopodium quinoa seedPublication . Casalvara, Rhaira Fernanda Ayoub; Santos, Everton da Silva; Mattos, Jose Vinicius; Pimentel, Tatiana Colombo; Calhelha, Ricardo C.; Pires, Tânia C.S.P.; Rodrigues, Daniele Bobrowski; Pereira, Carla; Corrêa, Rúbia C.G.; Cardozo‐Filho, Lucio; Gonçalves, José EduardoThis study aimed to investigate the effect of extraction methods and solvents (Soxhlet and supercritical fluid extraction, SFE) on the chemical profile (gas chromatography [GC]/mass spectrometry and GC/flame ionization detection) and antimicrobial, antioxidant, antitumor, and anti-inflammatory activities of quinoa Piabiru (QP) husk crude extracts. Soxhlet was applied using 100% water (QPSH2O), and ethanolic solutions of 50% ethanol (ethanol:water 50:50 v/v, QPSetOH50), 70% ethanol (QPSetOH70), and 99% ethanol (QPSetOH99) as solvents. SFE was applied using CO2 and n-propane as solvents (QPSF). QPSH2O extract showed a higher concentration of phytosterols (stigmasterol, β-sitosterol, 7,8-epoxylanostan-11-OL,3-acetoxy) and carotenoids (rhodopin) and oleic acid, displaying intermediate thiobarbituric acid reactive substance (TBARS) antioxidant activity. Intermediate concentrations of ethanol (QPSetOH50 and QPSetOH70 extracts) increased the extraction yields and the antibacterial activity of the extracts (Pseudomonas aeruginosa, Salmonella enterica, Bacillus cereus, and Staphylococcus aureus). Higher concentrations of ethanol (QPSetOH99 extract) contributed to increased antioxidant activity as assessed by TBARS and higher recoveries of 4-(allyloxy)-2-methyl-2-pentanol, nonadecane, and lauric, myristic, palmitic, linoleic, stearic, arachidic, behenic, and lignoceric acids. Finally, the QPSF extract presented higher antioxidant activity by DPPH, ABTS, and ferric-reducing antioxidant power, higher content of 5-methoxy-2-pentanone, 5-methoxy-2-methyl-2-pentanol, 1-(1,3-dimethylbutoxy)-2-propanol, oxalic, undecanoic, myristoleic, tricosanoic, pentadecanoic, elaidic, 11-eicosenoic, and erucic acids, and better antifungal activity against Aspergillus brasiliensis than the other extracts. Crude extracts were not cytotoxic against non-tumor cells (Vero) and did not show antitumor or antiinflammatory activities. Thus, antagonistic or synergistic effects of the phytochemical profile of quinoa husk crude extracts may present potential food and pharmaceutical applications. Practical Applications: The exceptional nutritional properties of quinoa seeds have boosted their cultivation in more than 123 countries. However, quinoa husks are generally considered waste. This study, which is of utmost importance, demonstrates the potential of extracting bioactive compounds from quinoa husks via pressurized fluids, turning them into a health-promoting co-product. This approach could minimize the current shortage of new antibiotics, antifungals, antitumor agents, and anti-inflammatory substances in the pharmaceutical and food sectors. By converting quinoa husks into valuable bioactive extracts,we contribute significantly to developing effective natural compounds, underlining the significance of our collective work.
- Evaluation of antitumoral and antioxidant activities of the hydroalcoholic extract and fractions obtained from the fruit pericarp of Sapindus saponaria L.Publication . Santos Filho, José Rivaldo dos; Santos, Everton da Silva; Mandim, Filipa; Molina, Adriana K.; Barros, Lillian; Gonçalves, Regina Aparecida Correia; Oliveira, Arildo José Braz de; Ferreira, Izabel Cristina PilotoThe fruits of Sapindus saponaria L., popularly known as 'saboeiro', have been used in medicine. This study evaluated the antioxidant and antitumor activities of the hydroethanolic extract (HAE) and fractions obtained from the fruit pericarp of S. saponaria. The HAE was obtained from the S. saponaria fruit pericarp by maceration; this was followed by fractionation using reversed-phase solid-phase extraction, resulting in fractions enriched with acyclic sesquiterpenic oligoglycosides (ASOG) and saponins (SAP1, and SAP2), confirmed by mass spectrometry with electrospray ionization (ESI-QTOF-MS). The greatest citotoxic activity was observed with the SAP1 fraction against the CaCo2 cell line with a GI(50) of 8.1 mu g mL(-1), while the SAP2 fraction had a GI(50) of 13.6 mu g mL(-1) against CaCo2. The HAE demonstrated the greatest antioxidant activity. S. saponaria has potential therapeutic use in the pharmaceutical industry as a natural anti-oxidant or antitumor product.
- Low-cost alternative for the bioproduction of bioactive phenolic compounds of callus cultures from Cereus hildmannianus (K.) SchumPublication . Santos, Everton da Silva; Savam, Aline; Cabral, Marcia Regina Pereira; Castro, Juliana Cristina; Collet, Sandra Aparecida de Oliveira; Mandim, Filipa; Calhelha, Ricardo C.; Barros, Lillian; Machado, Maria de Fatima Pires da Silva; Oliveira, Arildo Jose Braz; Gonçalves, Regina Aparecida CorreiaThe aim of this study was to establish a sustainable alternative callus culture of Cereus hildmannianus for the production and bioactive determination of phenolic compounds from this species. The conventional callus was cultivated using agar and Murashige and Skoog (MS) medium, while for the alternative culture the agar was replaced with a cotton support covered with filter paper and MS medium (incubated at 32 ◦C with photoperiod of 16 h), and the morphological characteristics and growth index were assessed (8 weeks). Extracts were obtained by maceration followed by partition, characterized by nuclear magnetic resonance - NMR and ultra-high performance liquid chromatography - UHPLC, quantified (phenolic compounds) by UV-Vis methods, and their antioxidant, antitumor activities, as well as cytotoxicity, were evaluated. The establishment of an alternative callus culture was carried out successfully. Characteristic signals of phenolic compounds were determined by NMR, and 46 compounds with fragment ions were identified using UHPLC analysis. The highest concentrations of phenolic compounds, and greatest antioxidant and antitumor activities, were obtained with the dichloromethane fractions of both callus tissue cultures, which were not cytotoxic. The callus culture from C. hildmannianus has shown promise as a source for the sustainable production of phenolic compounds with antioxidant and antiproliferative activities and thus, has potential use as a natural antitumor product.