Papers by Author: J.M.M. Mello

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Authors: Josiane R. Silvano, J.M.M. Mello, Lucinao Luiz Silva, Humberto Gracher Riella, Márcio Antônio Fiori
Abstract: A major challenge in the manufacture of films for polymeric packaging is the definition and setting of the friction coefficient (FCO) for the film surfaces. The FCO values are established with the incorporation of additives during the processing of the polymeric films. But, the homogenization of these additives in the polymeric matrix is very difficult. The additives have different polarity that the matrix polymeric and not are mixable. So, these additives migrate for the surface of the polymeric films easily. Several molecules are used as sliding additives, but among the most efficient are the amides molecules, highlighting the erucamide. This molecule promotes the decrease of the FOC but due its quick migration for the polymeric film surface provides numerous problems for the manufacture of the polymeric packaging and during its application as the product. In this work a nanocomposite (MMT-ERU) was obtained by an intercalation process to improve the compatibility between the polymeric materials and the erucamide molecules. The results shown in this work refers to the studies about the intercalation processes of the erucamide molecules into nanoclays (montmorillonite) to obtain the nanocomposite MMT-ERU. The effect of the temperature and the percentage of the nanoclay in the intercalation processes were studied. The results of x-ray diffraction and differential scanning calorimetry shown that erucamide molecules were intercalated in the nanoclay structures and that intercalation efficiency depends positively of the temperature and percentage amount of the nanoclay in the reaction medium.
Authors: R.L. Roman, J.P.Z. Gonçalves, S.C. Fernandes, Lucinao Luiz Silva, J. Dal Magro, J.M.M. Mello, Márcio Antônio Fiori
Abstract: Nanowires of carbon coated ferric oxide (Fe2O3/C) have been studied to be applied at an electrochemical glucose biosensor as a new type of carbon paste electrode (CPE) modifier. The Fe2O3/C was synthesized by adapting co-precipitation hydrothermal route. Firstly, amperometric sensor based on a modified CPE doped with Fe2O3 has been developed and compared with CPE doped with Fe2O3/C for hydrogen peroxide (H2O2) determination. The performance evaluations for the modified materials and sensors were studied in detail through cyclic voltammetry (CV) method. After, the electrochemical sensor performance was also evaluated for glucose oxidase (GOx) response biosensor due to considerable interest in the blood sugar control. The results demonstrate that the GOx retains its biocatalytic activity toward the oxidation of glucose and that the bioelectrode modified by the Fe2O3/C matrix has potential for use in biosensors and other bioelectronics devices.
Authors: Raquel Piletti, A.M. Bugiereck, A. Pereira, J.M.M. Mello, F. Dalcanton, R. Ternus, J. Dal Magro, Humberto Gracher Riella, Márcio Antônio Fiori
Abstract: Essential oils, their antimicrobial properties due to arouse interest in the food industry for use as antimicrobial additives. However, due to their low thermal and oxidative stability its application is limited. Among the essential oils, eugenol is a compound already used studied due to their numerous properties. To minimize the degradative effects resulting from environmental factors or thermal processing, one possibility is the formation of inclusion complexes with β-CD in order to increase their thermal stability and provide controlled release. The objective of this study was to obtain and characterize β-CD-eugenol microcapsules obtained in solutions containing low concentrations of Eugenol compound. The result showed the formation of the microcapsules but with low antibacterial actions due the low concentration of Eugenol in the complexes. The encapsulations constant (Kc) determined is 27.62 M-1 and the FTIR spectra indicated the microencapsulation.
Authors: Jair J. Fiori, Lucinao Luiz Silva, K.C. Picolli, R. Ternus, J. Ilha, F. Decalton, J.M.M. Mello, Humberto Gracher Riella, Márcio Antônio Fiori
Abstract: Currently the use of nanotechnology has been seeking to develop additives that have antimicrobial and low toxicity, enabling applications in various industrial sectors, in particular the paint industry. Inks with antimicrobial properties enable greater security to the user, eliminating pathogens that can cause disease when in contact with humans and animals. Thus, the zinc oxide nanoparticles have attracted a great scientific and technological interest as inorganic antimicrobial agent due to its oligodynamic effect. This work aims to study the effect oligodynamic zinc oxide nanoparticles in antimicrobial properties of acrylic paints. The acrylic paints were developed with various concentrations of zinc oxide nanoparticles, and were subsequently conducted microbiological characterization of death curve and agar diffusion. To evaluation the physico-chemical properties were used the techniques differential scanning calorimetry (DSC); Scanning electron microscopy (SEM), X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR). The results demonstrate that there was a reduction in the high antimicrobial activity of paints containing zinc oxide nanoparticles as compared to standard paint. Even with the addition of zinc oxide nanoparticles did not change the microstructure and chemical properties of acrylic coatings.
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