RESUMO
Co-abietate and Cu-abietate complexes were obtained by a low-cost and eco-friendly route. The synthesis process used Pinus elliottii resin and an aqueous solution of CuSO4/CoSO4 at a mild temperature (80 °C) without organic solvents. The obtained complexes are functional pigments for commercial architectural paints with antipathogenic activity. The pigments were characterized by Fourier-transform infrared spectroscopy (FTIR), mass spectrometry (MS), thermogravimetry (TG), near-edge X-ray absorption fine structure (NEXAFS), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), and colorimetric analysis. In addition, the antibacterial efficiency was evaluated using the minimum inhibitory concentration (MIC) test, and the antiviral tests followed an adaptation of the ISO 21702:2019 guideline. Finally, virus inactivation was measured using the RT-PCR protocol using 10% (w/w) of abietate complex in commercial white paint. The Co-abietate and Cu-abietate showed inactivation of >4 log against SARS-CoV-2 and a MIC value of 4.50 µg·mL-1 against both bacteria Staphylococcus aureus (S. aureus) and Escherichia coli (E. coli). The results suggest that the obtained Co-abietate and Cu-abietate complexes could be applied as pigments in architectural paints for healthcare centers, homes, and public places.
RESUMO
We report on the synthesis of boehmite aluminum oxide hydroxide particles with lamellar structure (γ-AlO(OH)) obtained from the recycling of metallic can seals, with the addition of silver nanoparticles (Ag-NPs) reduced by Aloe Vera extract. X-ray diffractometry (XRD) confirmed the γ-phase, and scanning electron microscopy (SEM) showed the presence of Ag-NPs on the boehmite particle surface, confirming the efficiency of the synthesis to obtain the composite material. The samples were used to treat lake water, according to the Standard Methods for the Examination of Water and Wastewater. The results indicated that the elimination of total coliforms and Escherichia coli occurred, with excellent efficiency for the Ag-boehmite sample. The tests show the possibility of reuse (5×) of the sample, as it maintained the efficiency of disinfection for E. coli. The preparation, use, and reuse of boehmite obtained from metallic waste is a case of a circular economy, focused on sustainability and green chemistry.
RESUMO
This data article is associated with the work "Ecofriendly synthesis of Zn-abietate complex derived from Pinus elliottii resin and its application as an antibacterial pigment against S. aureus and E. coli". The characterization data of the Zn-abietate complex obtained from Pinus elliottii resin and their reactional intermediary (Na-abietate) are reported. The Na-abietate was prepared with purified Pinus resin and sodium hydroxide (≥ 99%) in a stoichiometric ratio of 1:1. For the Zn-abietate synthesis was used ZnSO4 and Na-abietate solutions were at mild temperature and stirring without using organic solvents to ensuring the green character of the synthesis. Spectroscopic and structural characterization was consistent with an octahedral complex involving three carboxylate ligands per metal ion. X-ray photoelectron spectroscopy (XPS) analysis of the Na-abietate salt confirms the presence of carbonyl groups, carbon-oxygen atoms simple bonds (O-C/O=C), and carboxylate groups oxygen atoms (O-C=O). Analysis of the Zn LMM Auger, for the Zn-abietate complex, indicates the presence of zinc atoms with oxidation state Zn2+, this is supported by the distance between Zn 2p3/2 and 1p1/2 in the XPS spectrum. Together, these data will be useful for the structural representation of the samples.
RESUMO
The synthesis of structured MgO is reported using feedstock starch (route I), citrus pectin (route II), and Aloe vera (route III) leaf, which are suitable for use as green fuels due to their abundance, low cost, and non-toxicity. The oxides formed showed high porosity and were evaluated as antimicrobial agents. The samples were characterized by energy-dispersive X-ray fluorescence (EDXRF), X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), and scanning electron microscopy (SEM). The crystalline periclase monophase of the MgO was identified for all samples. The SEM analyses show that the sample morphology depends on the organic fuel used during the synthesis. The antibacterial activity of the MgO-St (starch), MgO-CP (citrus pectin), and MgO-Av (Aloe vera) oxides was evaluated against pathogens Staphylococcus aureus (ATCC 6538P) and Escherichia coli (ATCC 8739). Antifungal activity was also studied against Candida albicans (ATCC 64548). The studies were carried out using the qualitative agar disk diffusion method and quantitative minimum inhibitory concentration (MIC) tests. The MIC of each sample showed the same inhibitory concentration of 400 µg. mL-1 for the studied microorganisms. The formation of inhibition zones and the MIC values in the antimicrobial analysis indicate the effective antimicrobial activity of the samples against the test microorganisms.
Assuntos
Anti-Infecciosos , Nanopartículas Metálicas , Óxido de Magnésio/farmacologia , Antibacterianos/química , Anti-Infecciosos/farmacologia , Microscopia Eletrônica de Varredura , Escherichia coli , Testes de Sensibilidade Microbiana , Amido/farmacologia , Espectroscopia de Infravermelho com Transformada de Fourier , Nanopartículas Metálicas/química , Difração de Raios XRESUMO
Este trabalho teve como objetivo verificar a ocorrência de Listeria monocytogenes em salames artesanais, elaborados por pequenas indústrias do setor de carnes do sul do Brasil. Das cinqüenta amostras de salames de diferentes fabricantes avaliadas, em 8% foi verificada a presença de L. monocytogenes. Os valores de pH dessas amostras variaram entre 4,35 e 5,99 e a atividade de água de 0,89 a 0,91. A implantação das Boas Práticas de Fabricação neste setor é fundamental para obter alimentos prontos para o consumo e seguros à saúde do consumidor.
Assuntos
Contaminação de Alimentos , Microbiologia de Alimentos , Amostras de Alimentos , Produtos da Carne/microbiologia , Brasil , Listeria monocytogenes/isolamento & purificação , Listeria monocytogenes/patogenicidadeRESUMO
Este trabalho teve como objetivo verificar a ocorrência de Listeria monocytogenes em salames artesanais, elaborados por pequenas indústrias do setor de carnes do sul do Brasil. Das cinqüenta amostras de salames de diferentes fabricantes avaliadas, em 8% foi verificada a presença de L. monocytogenes. Os valores de pH dessas amostras variaram entre 4,35 e 5,99 e a atividade de água de 0,89 a 0,91. A implantação das Boas Práticas de Fabricação neste setor é fundamental para obter alimentos prontos para o consumo e seguros à saúde do consumidor.(AU)
The objective of this work was to verify the occurrence of Listeria monocytogenes in artisanal sausages,elaborated in small scale meat industries from south of Brazil. Fifty samples of sausages from differentmanufacturers were evaluated, and the presence of L. monocytogenes was verified in 8% of the samples. Thevalues of pH of these samples varied between 4,35 and 5,99 and the water activity ranged from 0,89 to 0,91. The implantation of Good Manufacture Practices in this sector is basic to obtain foods ready to eat and safe to the consumer's health. (AU)