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Research paper thumbnail of Evaluation of polypropylene degradation with commercial additives in different media of exposure

Revista Eletrônica em Gestão, Educação e Tecnologia Ambiental, 2020

Polypropylene (PP) is one of the most widely used polymers in the world, mainly due to its versat... more Polypropylene (PP) is one of the most widely used polymers in the world, mainly due to its versatility, good properties, and low cost. However, since it is not easily degraded in the natural environment, several research projects have been developed to increase its biodegradability. The use of pro-degrading additives has been explored, as they promote the process of polymer degradation. Nevertheless, few studies have evaluated the degradation of these materials in natural aqueous environments such as rivers and lakes, which contain large amounts of PP waste. The goal of this study was to evaluate the degradation of polypropylene, as well as the biodegradation of PP through the incorporation of two additives of different natures, organic and enzymatic. For this purpose, PP blends were produced with 4% additive, which has the purpose of conferring biodegradability to the material, since polypropylene has high resistance to degradation. In order to verify the behavior of the materials ...

Research paper thumbnail of Efeito De Um Aditivo Enzimático Comercial Na Degradação De Pebd Em Meio Salino

Impactos das Tecnologias na Engenharia de Materiais e Metalúrgica, 2019

Elaborado por Maurício Amormino Júnior-CRB6/2422 O conteúdo dos artigos e seus dados em sua forma... more Elaborado por Maurício Amormino Júnior-CRB6/2422 O conteúdo dos artigos e seus dados em sua forma, correção e confiabilidade são de responsabilidade exclusiva dos autores. 2019 Permitido o download da obra e o compartilhamento desde que sejam atribuídos créditos aos autores, mas sem a possibilidade de alterá-la de nenhuma forma ou utilizá-la para fins comerciais.

Research paper thumbnail of New quercetin-coated titanate nanotubes and their radiosensitization effect on human bladder cancer

Materials Science and Engineering: C, 2020

Interest in nanostructures such as titanate nanotubes (TNT) has grown notably in recent years due... more Interest in nanostructures such as titanate nanotubes (TNT) has grown notably in recent years due to their biocompatibility and economic viability, making them promising for application in the biomedical field. Quercetin (Qc) has shown great potential as a chemopreventive agent and has been widely studied for the treatment of diseases such as bladder cancer. Motivated by the possibilities of developing a new hybrid nanostructure with potential in biomedical applications, this study aimed to investigate the incorporation of quercetin in sodium (NaTNT) and zinc (ZnTNT) titanate nanotubes, and characterize the nanostructures formed. Qc release testing was also performed and cytotoxicity in Vero and T24 cell lines evaluated by the MTT assay. The effect of TNTs on T24 bladder cancer cell radiosensitivity was also assessed, using cell proliferation and a clonogenic assay. The TNT nanostructures were synthesized and characterized by FESEM, EDS, TEM, FTIR, XRD and TGA. The results showed that the nanostructures have a tubular structure and that the exchange of Na + ions for Zn 2+ and incorporation of quercetin did not alter this morphology. In addition, interaction between Zn and Qc increased the thermal stability of the nanostructures. The release test showed that maximum Qc delivery occurred after 24 h and the presence of Zn controlled its release. Biological assays indicated that the NaTNTQc and ZnTNTQc nanostructures decreased the viability of T24 cells after 48 h at high concentrations. Furthermore, the clonogenic assay showed that NaTNT, NaTNTQc, ZnTNT and ZnTNTQc combined with 5 Gy reduced the formation of polyclonal colonies of T24 cells after 48 h. The results suggest that the nanostructures synthesized in this study interfere in cell proliferation and can therefore be a powerful tool in the treatment of bladder cancer.

Research paper thumbnail of Investigation of degradation of polypropylene in soil using an enzymatic additive

Iranian Polymer Journal, 2019

Polypropylene (PP) has been widely used industrially in several sectors, mainly in the use of pac... more Polypropylene (PP) has been widely used industrially in several sectors, mainly in the use of packaging of different products. Thus, this has been accumulated in our environment due to the incorrect disposal and its high resistance toward degradation, causing an array of environmental impacts. With this, one alternative that has been explored to minimize the problems intensified by these residues is the use of pro-degrading additives. Therefore, the aim of this work is to evaluate the degradation process of PP blends in soil using enzymatic additive. The soil degradation experiment was done for 6 months; monthly collected samples were checked for alterations on the material properties during that time. The extent of PP degradation with enzymatic additive was compared to an organic additive by techniques of FTIR, TGA, DSC, carbonyl index (CI), and crystallinity. From the obtained results it was observed that the additives influenced the degradation of PP. In addition, the enzymatic additive caused more significant changes in the CI (increase of 3693%), crystallinity (variation of 18.7%), and structural characteristics, indicating a greater influence on the degradation process in relation to the organic additive. In this way, this work has had an important role in the research and development of biodegradable materials with the aim of minimizing the effects induced by plastic waste in the environment.

Research paper thumbnail of Engenharia no Século XXI - Volume 4

Modo de acesso: World Wide Web Inclui bibliografia 1. Engenharia 2. Educação.I. Título CDD-620 O ... more Modo de acesso: World Wide Web Inclui bibliografia 1. Engenharia 2. Educação.I. Título CDD-620 O conteúdo dos artigos e seus dados em sua forma, correção e confiabilidade são de responsabilidade exclusiva dos seus respectivos autores.

Research paper thumbnail of Hábitos e perspectivas do consumo de café entre as classes sociais “A” e “B” da cidade de Machado/MG

Revista Agrogeoambiental, 2010

Com a globalização, a segmentação de mercado ganhou muita importância e trouxe consigo a produção... more Com a globalização, a segmentação de mercado ganhou muita importância e trouxe consigo a produção de produtos e serviços na medida e em conformidade com as particularidades e expectativas de cada um dos diferentes públicos. Produtos iguais não conseguem mais atender, em sua plenitude, todos os públicos pois esses possuem demandas e necessidades diferentes. O objetivo desse trabalho foi diagnosticar os hábitos e preferências do consumo de café entre as classes sociais "A" e "B" da cidade de Machado-MG, verificando se há predisposição desses em comprar um café diferencia. Para tal foi realizado uma pesquisa descritiva, nos principais supermercados de Machado/MG, onde se realizou uma entrevista, para determinar as particularidades desse publico alvo e posteriormente um teste cego com 3 marcas comerciais (apontadas como mais vendidas pelos supermercadistas) e uma de um café especial, preparados no Instituto Federal Sul de Minas. Os resultados demonstraram que os consumidores das classes A e B conseguiram diagnosticar, em sua maioria, o café especial e que comprariam tal por um preço acima dos praticados pelo mercado. Palavras-chave: Consumo de café; Marketing do café; Marcas; Desenvolvimento de produto.

Research paper thumbnail of Glucose and Fructose Fermentation by Wine Yeasts in Media Containing Structurally Complex Nitrogen Sources

Journal of the Institute of Brewing, 2008

Glucose and fructose fermentations by industrial yeasts strains are strongly affected by both the... more Glucose and fructose fermentations by industrial yeasts strains are strongly affected by both the structural complexity of the nitrogen source and the availability of oxygen. In this study two Saccharomyces cerevisiae industrial wine strains were grown, under shaken and static conditions, in a media containing either a) 20% (w/v) glucose, or b) 10% (w/v) fructose and 10% (w/v) glucose or c) 20% (w/v) fructose, all supplemented with nitrogen sources varying from a single ammonium salt (ammonium sulfate) to free amino acids (casamino acids) and peptides (peptone). Data suggest that a complex structured nitrogen source is not submitted to the same control mechanisms as those involved in the utilization of simpler structured nitrogen sources, and mutual interaction between carbon and nitrogen sources, including the mechanisms involved in the regulation of aerobic/anaerobic metabolism, may play an important role in defining yeast fermentation performance and the differing response to the structural complexity of the nitrogen source, with a strong impact on fermentation performance.

Research paper thumbnail of Efficient very-high-gravity fermentation of sugarcane molasses by industrial yeast strains

Journal of the Institute of Brewing, 2016

In this study industrial strains were inoculated, in successive cycles, at high cell density into... more In this study industrial strains were inoculated, in successive cycles, at high cell density into a sugarcane-based juice containing normal (22%, w/v) and very high sucrose (30%, w/v) levels and supplemented with peptone as a nitrogen source. At 30°C, in shaken cultures, in the normal gravity situation, efficient sucrose utilization occurred in both the supplemented and unsupplemented medium. At higher sugar concentrations, supplementation with peptone induced a more efficient fermentation compared with the unsupplemented medium, with higher biomass accumulation and maintenance of cell viability, and ethanol levels as high as 16% (v/v). Trehalose was also high during the cycles, probably as a necessary response of the yeast to the high stress fermentation conditions. This suggests that it is possible to increase ethanol production by using very-high-fermentation technology and that nutritional supplementation would have a positive effect on the fermentation, allowing for efficient sugar consumption and cell viability maintenance.

Research paper thumbnail of Evaluation of polypropylene degradation with commercial additives in different media of exposure

Revista Eletrônica em Gestão, Educação e Tecnologia Ambiental, 2020

Polypropylene (PP) is one of the most widely used polymers in the world, mainly due to its versat... more Polypropylene (PP) is one of the most widely used polymers in the world, mainly due to its versatility, good properties, and low cost. However, since it is not easily degraded in the natural environment, several research projects have been developed to increase its biodegradability. The use of pro-degrading additives has been explored, as they promote the process of polymer degradation. Nevertheless, few studies have evaluated the degradation of these materials in natural aqueous environments such as rivers and lakes, which contain large amounts of PP waste. The goal of this study was to evaluate the degradation of polypropylene, as well as the biodegradation of PP through the incorporation of two additives of different natures, organic and enzymatic. For this purpose, PP blends were produced with 4% additive, which has the purpose of conferring biodegradability to the material, since polypropylene has high resistance to degradation. In order to verify the behavior of the materials ...

Research paper thumbnail of Efeito De Um Aditivo Enzimático Comercial Na Degradação De Pebd Em Meio Salino

Impactos das Tecnologias na Engenharia de Materiais e Metalúrgica, 2019

Elaborado por Maurício Amormino Júnior-CRB6/2422 O conteúdo dos artigos e seus dados em sua forma... more Elaborado por Maurício Amormino Júnior-CRB6/2422 O conteúdo dos artigos e seus dados em sua forma, correção e confiabilidade são de responsabilidade exclusiva dos autores. 2019 Permitido o download da obra e o compartilhamento desde que sejam atribuídos créditos aos autores, mas sem a possibilidade de alterá-la de nenhuma forma ou utilizá-la para fins comerciais.

Research paper thumbnail of New quercetin-coated titanate nanotubes and their radiosensitization effect on human bladder cancer

Materials Science and Engineering: C, 2020

Interest in nanostructures such as titanate nanotubes (TNT) has grown notably in recent years due... more Interest in nanostructures such as titanate nanotubes (TNT) has grown notably in recent years due to their biocompatibility and economic viability, making them promising for application in the biomedical field. Quercetin (Qc) has shown great potential as a chemopreventive agent and has been widely studied for the treatment of diseases such as bladder cancer. Motivated by the possibilities of developing a new hybrid nanostructure with potential in biomedical applications, this study aimed to investigate the incorporation of quercetin in sodium (NaTNT) and zinc (ZnTNT) titanate nanotubes, and characterize the nanostructures formed. Qc release testing was also performed and cytotoxicity in Vero and T24 cell lines evaluated by the MTT assay. The effect of TNTs on T24 bladder cancer cell radiosensitivity was also assessed, using cell proliferation and a clonogenic assay. The TNT nanostructures were synthesized and characterized by FESEM, EDS, TEM, FTIR, XRD and TGA. The results showed that the nanostructures have a tubular structure and that the exchange of Na + ions for Zn 2+ and incorporation of quercetin did not alter this morphology. In addition, interaction between Zn and Qc increased the thermal stability of the nanostructures. The release test showed that maximum Qc delivery occurred after 24 h and the presence of Zn controlled its release. Biological assays indicated that the NaTNTQc and ZnTNTQc nanostructures decreased the viability of T24 cells after 48 h at high concentrations. Furthermore, the clonogenic assay showed that NaTNT, NaTNTQc, ZnTNT and ZnTNTQc combined with 5 Gy reduced the formation of polyclonal colonies of T24 cells after 48 h. The results suggest that the nanostructures synthesized in this study interfere in cell proliferation and can therefore be a powerful tool in the treatment of bladder cancer.

Research paper thumbnail of Investigation of degradation of polypropylene in soil using an enzymatic additive

Iranian Polymer Journal, 2019

Polypropylene (PP) has been widely used industrially in several sectors, mainly in the use of pac... more Polypropylene (PP) has been widely used industrially in several sectors, mainly in the use of packaging of different products. Thus, this has been accumulated in our environment due to the incorrect disposal and its high resistance toward degradation, causing an array of environmental impacts. With this, one alternative that has been explored to minimize the problems intensified by these residues is the use of pro-degrading additives. Therefore, the aim of this work is to evaluate the degradation process of PP blends in soil using enzymatic additive. The soil degradation experiment was done for 6 months; monthly collected samples were checked for alterations on the material properties during that time. The extent of PP degradation with enzymatic additive was compared to an organic additive by techniques of FTIR, TGA, DSC, carbonyl index (CI), and crystallinity. From the obtained results it was observed that the additives influenced the degradation of PP. In addition, the enzymatic additive caused more significant changes in the CI (increase of 3693%), crystallinity (variation of 18.7%), and structural characteristics, indicating a greater influence on the degradation process in relation to the organic additive. In this way, this work has had an important role in the research and development of biodegradable materials with the aim of minimizing the effects induced by plastic waste in the environment.

Research paper thumbnail of Engenharia no Século XXI - Volume 4

Modo de acesso: World Wide Web Inclui bibliografia 1. Engenharia 2. Educação.I. Título CDD-620 O ... more Modo de acesso: World Wide Web Inclui bibliografia 1. Engenharia 2. Educação.I. Título CDD-620 O conteúdo dos artigos e seus dados em sua forma, correção e confiabilidade são de responsabilidade exclusiva dos seus respectivos autores.

Research paper thumbnail of Hábitos e perspectivas do consumo de café entre as classes sociais “A” e “B” da cidade de Machado/MG

Revista Agrogeoambiental, 2010

Com a globalização, a segmentação de mercado ganhou muita importância e trouxe consigo a produção... more Com a globalização, a segmentação de mercado ganhou muita importância e trouxe consigo a produção de produtos e serviços na medida e em conformidade com as particularidades e expectativas de cada um dos diferentes públicos. Produtos iguais não conseguem mais atender, em sua plenitude, todos os públicos pois esses possuem demandas e necessidades diferentes. O objetivo desse trabalho foi diagnosticar os hábitos e preferências do consumo de café entre as classes sociais "A" e "B" da cidade de Machado-MG, verificando se há predisposição desses em comprar um café diferencia. Para tal foi realizado uma pesquisa descritiva, nos principais supermercados de Machado/MG, onde se realizou uma entrevista, para determinar as particularidades desse publico alvo e posteriormente um teste cego com 3 marcas comerciais (apontadas como mais vendidas pelos supermercadistas) e uma de um café especial, preparados no Instituto Federal Sul de Minas. Os resultados demonstraram que os consumidores das classes A e B conseguiram diagnosticar, em sua maioria, o café especial e que comprariam tal por um preço acima dos praticados pelo mercado. Palavras-chave: Consumo de café; Marketing do café; Marcas; Desenvolvimento de produto.

Research paper thumbnail of Glucose and Fructose Fermentation by Wine Yeasts in Media Containing Structurally Complex Nitrogen Sources

Journal of the Institute of Brewing, 2008

Glucose and fructose fermentations by industrial yeasts strains are strongly affected by both the... more Glucose and fructose fermentations by industrial yeasts strains are strongly affected by both the structural complexity of the nitrogen source and the availability of oxygen. In this study two Saccharomyces cerevisiae industrial wine strains were grown, under shaken and static conditions, in a media containing either a) 20% (w/v) glucose, or b) 10% (w/v) fructose and 10% (w/v) glucose or c) 20% (w/v) fructose, all supplemented with nitrogen sources varying from a single ammonium salt (ammonium sulfate) to free amino acids (casamino acids) and peptides (peptone). Data suggest that a complex structured nitrogen source is not submitted to the same control mechanisms as those involved in the utilization of simpler structured nitrogen sources, and mutual interaction between carbon and nitrogen sources, including the mechanisms involved in the regulation of aerobic/anaerobic metabolism, may play an important role in defining yeast fermentation performance and the differing response to the structural complexity of the nitrogen source, with a strong impact on fermentation performance.

Research paper thumbnail of Efficient very-high-gravity fermentation of sugarcane molasses by industrial yeast strains

Journal of the Institute of Brewing, 2016

In this study industrial strains were inoculated, in successive cycles, at high cell density into... more In this study industrial strains were inoculated, in successive cycles, at high cell density into a sugarcane-based juice containing normal (22%, w/v) and very high sucrose (30%, w/v) levels and supplemented with peptone as a nitrogen source. At 30°C, in shaken cultures, in the normal gravity situation, efficient sucrose utilization occurred in both the supplemented and unsupplemented medium. At higher sugar concentrations, supplementation with peptone induced a more efficient fermentation compared with the unsupplemented medium, with higher biomass accumulation and maintenance of cell viability, and ethanol levels as high as 16% (v/v). Trehalose was also high during the cycles, probably as a necessary response of the yeast to the high stress fermentation conditions. This suggests that it is possible to increase ethanol production by using very-high-fermentation technology and that nutritional supplementation would have a positive effect on the fermentation, allowing for efficient sugar consumption and cell viability maintenance.