This page has only limited features, please log in for full access.
Sanitary landfill leachate (LL) composition varies according to climate variables variation, solid waste characteristics and composition, and landfill age. Leachate treatment is essentially carried out trough biological and physicochemical processes, which have showed variability in efficiency and appear a costly solution for the management authorities. Electrocoagulation (EC) seems a suitable solution for leachate treatment taking into account the characteristics of the liquor. One of the problems of EC is the electrode passivation, which affects the longevity of the process. One solution to this problem could be the replacement of the electrode by one made of recyclable material, which would make it possible to change it frequently and at a lower cost. The objective of the present work was to evaluate the removal of heavy metals (As, Ba, Cd, Cr, Cu, Fe, Pb, Mn, Ni, Se and Zn) and coliforms from a LL by EC using electrodes made from steel swarf (SfE) up to 8 h. Removal efficiencies of detected heavy metals were 51%(Cr), 59%(As), 71%(Cd), 72%(Zn), 92%(Ba), 95%(Ni) and >99%(Pb). The microbial load of coliforms in leachate was reduced from 10.76 × 104 CFU/mL (raw leachate) to less than 1 CFU/mL (after treatment with SfE) (i.e., approximately 100% reduction). The use of SfE in EC of LL is very effective in removing heavy metals and coliforms and can be used as alternative treatment solution for such effluents.
Mayk de Oliveira; Ieda Torres; Humberto Ruggeri; Paulo Scalize; Antonio Albuquerque; Eric Gil. Application of Electrocoagulation with a New Steel-Swarf-Based Electrode for the Removal of Heavy Metals and Total Coliforms from Sanitary Landfill Leachate. Applied Sciences 2021, 11, 5009 .
AMA StyleMayk de Oliveira, Ieda Torres, Humberto Ruggeri, Paulo Scalize, Antonio Albuquerque, Eric Gil. Application of Electrocoagulation with a New Steel-Swarf-Based Electrode for the Removal of Heavy Metals and Total Coliforms from Sanitary Landfill Leachate. Applied Sciences. 2021; 11 (11):5009.
Chicago/Turabian StyleMayk de Oliveira; Ieda Torres; Humberto Ruggeri; Paulo Scalize; Antonio Albuquerque; Eric Gil. 2021. "Application of Electrocoagulation with a New Steel-Swarf-Based Electrode for the Removal of Heavy Metals and Total Coliforms from Sanitary Landfill Leachate." Applied Sciences 11, no. 11: 5009.
Carvedilol (CRV) is a non-selective blocker of α and β adrenergic receptors, which has been extensively used for the treatment of hypertension and congestive heart failure. Owing to its poor biopharmaceutical properties, CRV has been incorporated into different types of drug delivery systems and this necessitates the importance of investigating their compatibility and stability. In this sense, we have investigated the applicability of several electroanalytical tools to assess CRV compatibility with lipid excipients. Voltammetric and electrochemical impedance spectroscopy techniques were used to evaluate the redox behavior of CRV and lipid excipients. Results showed that Plurol® isostearic, liquid excipient, and stearic acid presented the greatest anode peak potential variation, and these were considered suitable excipients for CRV formulation. CRV showed the highest stability at room temperature and at 50 °C when mixed with stearic acid (7% w/w). The results also provided evidence that electrochemical methods might be feasible to complement standard stability/compatibility studies related to redox reactions.
Murilo Ferreira De Carvalho; Luane Ferreira Garcia; Isaac Yves Lopes De Macedo; Ricardo Neves Marreto; Mayk Teles De Oliveira; Renê Oliveira Do Couto; Carlos Eduardo Peixoto Da Cunha; Karla Carneiro De Siqueira Leite; Kênnia Rocha Rezende; Fabio Bahls Machado; Vernon Somerset; Eric De Souza Gil. Electroanalysis Applied to Compatibility and Stability Assays of Drugs: Carvedilol Study Case. Pharmaceuticals 2020, 13, 70 .
AMA StyleMurilo Ferreira De Carvalho, Luane Ferreira Garcia, Isaac Yves Lopes De Macedo, Ricardo Neves Marreto, Mayk Teles De Oliveira, Renê Oliveira Do Couto, Carlos Eduardo Peixoto Da Cunha, Karla Carneiro De Siqueira Leite, Kênnia Rocha Rezende, Fabio Bahls Machado, Vernon Somerset, Eric De Souza Gil. Electroanalysis Applied to Compatibility and Stability Assays of Drugs: Carvedilol Study Case. Pharmaceuticals. 2020; 13 (4):70.
Chicago/Turabian StyleMurilo Ferreira De Carvalho; Luane Ferreira Garcia; Isaac Yves Lopes De Macedo; Ricardo Neves Marreto; Mayk Teles De Oliveira; Renê Oliveira Do Couto; Carlos Eduardo Peixoto Da Cunha; Karla Carneiro De Siqueira Leite; Kênnia Rocha Rezende; Fabio Bahls Machado; Vernon Somerset; Eric De Souza Gil. 2020. "Electroanalysis Applied to Compatibility and Stability Assays of Drugs: Carvedilol Study Case." Pharmaceuticals 13, no. 4: 70.
The hospital environment requires special attention to air quality, since it needs to be healthy for the protection of patients and health professionals in order to prevent them against hospital infections. The objective of this study was to isolate, identify and evaluate the susceptibility profile of isolated fungi from two hospitals. For air sampling the impaction (Spin Air, IUL®) and passive sedimentation methods were used. For the isolation of fungi from surfaces, contact plates (RODAC®) were used. The identification of the fungi was performed by observing the macroscopic and microscopic aspects of the colonies, whereas for better visualization of fruiting structures, the microculture technique was performed on slides. To evaluate the susceptibility profile, the broth microdilution test recommended by CLSI was performed. Thirty-five isolates were identified: Aspergillus flavus (12), Aspergillus fumigatus (11), Aspergillus niger (1), Aspergillus terreus (2), Penicillium spp. (7), and Fusarium spp. (2) in the hospitals evaluated. All isolates had a minimum inhibitory concentration (MIC) more than 128 μg/ml for fluconazole; 0.5 to 4.0 μg/ml for amphotericin B (hospital 1), and all isolates from haospital 2 had MIC ≥2.0 μg/ml. In hospital 1, MIC for posaconazole ranged from 0.25 μg/ml to ≥32 μg/ml, and hospital 2 ranged from 0.5 to 1.0 μg/ml. The monitoring and evaluation of air quality and surfaces are essential measures for prevention and control of hospital infections, as these microorganisms are becoming increasingly resistant to antimicrobial agents, thus making treatment difficult, especially in immunocompromised individuals.
Mayk Teles de Oliveira; Nathany Kelly Ribeiro Batista; Eric De Souza Gil; Maria Do Rosário Rodrigues Silva; Carolina Rodrigues Costa; Maria Teresa Freitas Bara; Ieda Maria Sapateiro Torres. Risks associated with pathogenic fungi isolated from surgical centers, intensive care units, and materials sterilization center in hospitals. Risks associated with pathogenic fungi isolated from critical hospital areas. Medical Mycology 2020, 58, 881 -886.
AMA StyleMayk Teles de Oliveira, Nathany Kelly Ribeiro Batista, Eric De Souza Gil, Maria Do Rosário Rodrigues Silva, Carolina Rodrigues Costa, Maria Teresa Freitas Bara, Ieda Maria Sapateiro Torres. Risks associated with pathogenic fungi isolated from surgical centers, intensive care units, and materials sterilization center in hospitals. Risks associated with pathogenic fungi isolated from critical hospital areas. Medical Mycology. 2020; 58 (7):881-886.
Chicago/Turabian StyleMayk Teles de Oliveira; Nathany Kelly Ribeiro Batista; Eric De Souza Gil; Maria Do Rosário Rodrigues Silva; Carolina Rodrigues Costa; Maria Teresa Freitas Bara; Ieda Maria Sapateiro Torres. 2020. "Risks associated with pathogenic fungi isolated from surgical centers, intensive care units, and materials sterilization center in hospitals. Risks associated with pathogenic fungi isolated from critical hospital areas." Medical Mycology 58, no. 7: 881-886.
Indigo carmine (IC) is a dye that is widely used in textile industries. Since the dyes lixiviation reaches about 30%, these compounds are largely discharged in effluents, thus contaminating rivers and lakes. The IC presents high toxicity, causing topic irritation and carcinogenic effects. Electrocoagulation (EC) is based on the electrical dissolution of iron and aluminum ions used to promote the formation of metal hydroxide coagulants capable of destabilizing and aggregating pollutant compounds. In this context, this work aimed to investigate the use of electrodes obtained from the direct compression of metallurgical filing wastes on the EC remediation of IC. Electrodes of bronze, aluminum, steel and metal waste were produced and their performances were evaluated in NaCl 0.05 mol L−1 and tap water solutions at 2.5 and 5 V. The IC dye discoloration reached 84% for the aluminum commercial electrode, 90% for the steel commercial electrode and 96% for the bronze commercial electrode, respectively, in 80 min of treatment. For electrodes produced from chips (swarf), there was a discoloration of 72% for the aluminum electrode, 92% for the steel electrode and 90% for the bronze electrode, respectively, in the same time of treatment. These results showed that electrodes obtained from chips and commercial electrodes had similar electrochemical efficiency in the removal of IC dye from wastewater. Also, the use of metallic debris as electrodes makes its application an economically viable option on a large scale, since they have high effectiveness and lower cost and their replacement can solve the electrode passivation.
Mayk Teles de Oliveira; L. F. Garcia; A. C. R. Siqueira; Vernon S. Somerset; E. S. Gil. Electrocoagulation of the indigo carmine dye using electrodes produced from the compression of metallurgical filing wastes. International Journal of Environmental Science and Technology 2019, 17, 1657 -1662.
AMA StyleMayk Teles de Oliveira, L. F. Garcia, A. C. R. Siqueira, Vernon S. Somerset, E. S. Gil. Electrocoagulation of the indigo carmine dye using electrodes produced from the compression of metallurgical filing wastes. International Journal of Environmental Science and Technology. 2019; 17 (3):1657-1662.
Chicago/Turabian StyleMayk Teles de Oliveira; L. F. Garcia; A. C. R. Siqueira; Vernon S. Somerset; E. S. Gil. 2019. "Electrocoagulation of the indigo carmine dye using electrodes produced from the compression of metallurgical filing wastes." International Journal of Environmental Science and Technology 17, no. 3: 1657-1662.
This work details the study of the redox behavior of the drugs cyclobenzaprine (CBP), amitriptyline (AMP) and nortriptyline (NOR) through voltammetric methods and computational chemistry. Results obtained in this study show that the amine moiety of each compound is more likely to undergo oxidation at 1a at Ep1a ≈ 0.69, 0.79, 0.93 V (vs. Ag/AgCl/KClsat) for CBP, AMP and NOR, respectively. Moreover, CBP presented a second peak, 2a at Ep2a ≈ 0.98 V (vs. Ag/AgCl/KClsat) at pH 7.0. Furthermore, the electronic structure calculation results corroborate the electrochemical assays regarding the HOMO energies of the lowest energy conformers of each molecule. The mechanism for each anodic process is proposed according to electroanalytical and computational chemistry findings, which show evidence that the methods herein employed may be a valuable alternative to study the redox behavior of structurally similar drugs.
Edson Silvio Batista Rodrigues; Isaac Yves Lopes De Macêdo; Larissa Lesley Da Silva Lima; Douglas Vieira Thomaz; Carlos Eduardo Peixoto Da Cunha; Mayk Teles De Oliveira; Nara Ballaminut; Morgana Fernandes Alecrim; Murilo Ferreira De Carvalho; Bruna Guimarães Isecke; Karla Carneiro De Siqueira Leite; Fabio Bahls Machado; Freddy Fernandes Guimarães; Ricardo Menegatti; Vernon Somerset; Eric De Souza Gil. Electrochemical Characterization of Central Action Tricyclic Drugs by Voltammetric Techniques and Density Functional Theory Calculations. Pharmaceuticals 2019, 12, 116 .
AMA StyleEdson Silvio Batista Rodrigues, Isaac Yves Lopes De Macêdo, Larissa Lesley Da Silva Lima, Douglas Vieira Thomaz, Carlos Eduardo Peixoto Da Cunha, Mayk Teles De Oliveira, Nara Ballaminut, Morgana Fernandes Alecrim, Murilo Ferreira De Carvalho, Bruna Guimarães Isecke, Karla Carneiro De Siqueira Leite, Fabio Bahls Machado, Freddy Fernandes Guimarães, Ricardo Menegatti, Vernon Somerset, Eric De Souza Gil. Electrochemical Characterization of Central Action Tricyclic Drugs by Voltammetric Techniques and Density Functional Theory Calculations. Pharmaceuticals. 2019; 12 (3):116.
Chicago/Turabian StyleEdson Silvio Batista Rodrigues; Isaac Yves Lopes De Macêdo; Larissa Lesley Da Silva Lima; Douglas Vieira Thomaz; Carlos Eduardo Peixoto Da Cunha; Mayk Teles De Oliveira; Nara Ballaminut; Morgana Fernandes Alecrim; Murilo Ferreira De Carvalho; Bruna Guimarães Isecke; Karla Carneiro De Siqueira Leite; Fabio Bahls Machado; Freddy Fernandes Guimarães; Ricardo Menegatti; Vernon Somerset; Eric De Souza Gil. 2019. "Electrochemical Characterization of Central Action Tricyclic Drugs by Voltammetric Techniques and Density Functional Theory Calculations." Pharmaceuticals 12, no. 3: 116.
Lara Barroso Brito; Luane Ferreira Garcia; Marcos Pereira Caetano; Germán Sanz Lobón; Mayk Teles De Oliveira; Rhaul De Oliveira; Ieda Maria Sapateiro Torres; Alfonso Yepez; Boniek Gontijo Vaz; Rafael Luque; Cesar Koppe Grisolia; Marize Campos Valadares; Eric De Souza Gil; Gisele Augusto Rodrigues De Oliveira. Electrochemical remediation of amoxicillin: detoxification and reduction of antimicrobial activity. Chemico-Biological Interactions 2018, 291, 162 -170.
AMA StyleLara Barroso Brito, Luane Ferreira Garcia, Marcos Pereira Caetano, Germán Sanz Lobón, Mayk Teles De Oliveira, Rhaul De Oliveira, Ieda Maria Sapateiro Torres, Alfonso Yepez, Boniek Gontijo Vaz, Rafael Luque, Cesar Koppe Grisolia, Marize Campos Valadares, Eric De Souza Gil, Gisele Augusto Rodrigues De Oliveira. Electrochemical remediation of amoxicillin: detoxification and reduction of antimicrobial activity. Chemico-Biological Interactions. 2018; 291 ():162-170.
Chicago/Turabian StyleLara Barroso Brito; Luane Ferreira Garcia; Marcos Pereira Caetano; Germán Sanz Lobón; Mayk Teles De Oliveira; Rhaul De Oliveira; Ieda Maria Sapateiro Torres; Alfonso Yepez; Boniek Gontijo Vaz; Rafael Luque; Cesar Koppe Grisolia; Marize Campos Valadares; Eric De Souza Gil; Gisele Augusto Rodrigues De Oliveira. 2018. "Electrochemical remediation of amoxicillin: detoxification and reduction of antimicrobial activity." Chemico-Biological Interactions 291, no. : 162-170.