Registro fonte: Obtenção e caracterização de embalagens antimicrobianas contendo nanopartículas de prata obtidas por síntese verde empregando extrato aquoso de macela (Achyrocline satureioides)

Obtenção e caracterização de embalagens antimicrobianas contendo nanopartículas de prata obtidas por síntese verde empregando extrato aquoso de macela (Achyrocline satureioides)

Nanostructured materials have stood out in the market today and have different applicability. Among them are silver nanoparticles (AgNPs) that stand out in the food industry, in dental materials and packaging as they have excellent antimicrobial activity, good conductivity and have a high catalytic...

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Autor principal:	Vanin, Letícia Papaes
Formato:	Trabalho de Conclusão de Curso (Graduação)
Idioma:	Português
Publicado em:	Universidade Tecnológica Federal do Paraná 2022
Assuntos:	Nanopartículas Amido Agentes antiinfecciosos Camomila Embalagens Nanoparticles Starch Anti-infective agents German chamomile Packaging CNPQ::CIENCIAS AGRARIAS::CIENCIA E TECNOLOGIA DE ALIMENTOS
Acesso em linha:	http://repositorio.utfpr.edu.br/jspui/handle/1/27237
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spelling	riut-1-272372022-02-23T06:10:12Z Obtenção e caracterização de embalagens antimicrobianas contendo nanopartículas de prata obtidas por síntese verde empregando extrato aquoso de macela (Achyrocline satureioides) Obtaining and characterization of antimicrobial packages containing silver nanoparticles obtained by greens synthesis using aqueous macela extract (Achyrocline satureioides) Vanin, Letícia Papaes Gonçalves, Odinei Hess Gonçalves, Odinei Hess Bona, Evandro Perdoncini, Márcia Regina Ferreira Geraldo Nanopartículas Amido Agentes antiinfecciosos Camomila Embalagens Nanoparticles Starch Anti-infective agents German chamomile Packaging CNPQ::CIENCIAS AGRARIAS::CIENCIA E TECNOLOGIA DE ALIMENTOS Nanostructured materials have stood out in the market today and have different applicability. Among them are silver nanoparticles (AgNPs) that stand out in the food industry, in dental materials and packaging as they have excellent antimicrobial activity, good conductivity and have a high catalytic effect. As a result, green synthesis is currently being used as a sustainable alternative to replace chemical reagents and their environmental impact on the environment and health. Thus, the objective of this work was to synthesize and characterize AgNPs using the green synthesis process, using an aqueous macela extract, and to prepare cassava starch films by the casting technique with the suspension of AgNPs, as well as to analyze the characteristics of the polymeric materials obtained. Therefore, the AgNPs were obtained using 25mL of aqueous solution containing 7.5% of the plant extract (macela), 2% or 5% (v/v) of a 1% (m/v) capping agent solution (PVA or PVP or sodium citrate) (with and without pH adjustment to 8.5), then 250mL of silver nitrate solution (0.02 mmol) was dropped into the extract solution. Suspensions containing AgNPs were characterized by UV-vis, DLS, Zeta Potential, TGA, DSC and antimicrobial activity by the diffuse disk technique. Then 3 experiments were selected from the analysis of the results of nanoparticles size, suspension stability, and antimicrobial activity, then the suspension of these AgNPs was used to obtain cassava starch films. The casting method was used, where cassava starch was dispersed in the suspension of AgNPs, then the system was heated under stirring to the starch gelatinization temperature, kept for 10 minutes, then citric acid was added and after cooling the system to 60º Glycerol was added, the gel obtained was poured into silicone molds and dried in a study with air circulation at 50°C for 24 hours. The films were characterized by DSC, tensile test, thickness, moisture, weight, solubility, and antimicrobial activity by the diffuse disc technique. Through the analysis of UV-Vis, DSC and TGA it was observed that the macela played a role of reducing agent. With the DLS analysis we observed the particle size and through the Zeta Potential the stability of the suspension that were influenced by the change in pH, type and concentration of the capping agent used, and it was also possible to verify that the AgNPs suspensions obtained presented good antimicrobial ability. The casting technique to obtain starch films containing AgNPs proved to be simple and adequate, and after analyzing the results of the characterization of the films, it was verified that the films obtained presented satisfactory antimicrobial activity, and that the AgNPs with capping agents acted in such a way as to leaving the films more flexible, but less resistant, suggesting that AgNPs with capping acted as a plasticizer. Thus, it can be concluded that green synthesis is a promising process for obtaining AgNPs, and that these can be used to obtain antimicrobial polymeric films intended, for example, for packaging. Materiais nanoestruturados tem se destacado no mercado atualmente por possuírem diferentes aplicabilidades. Entre eles se encontra as nanopartículas de prata (AgNPs) que se destacam na indústria alimentícia, em materiais odontológicos e embalagens visto que apresentam ótima atividade antimicrobiana, boa condutividade e possuem alto efeito catalítico. Em decorrência disso, a síntese verde atualmente vem sendo utilizada como uma alternativa sustentável visando substituir reagentes químicos e seu impacto ambiental para o meio ambiente e para a saúde. Assim, o objetivo deste trabalho foi sintetizar e caracterizar AgNPs utilizando o processo de síntese verde, empregando extrato aquoso da macela, e preparar filmes de amido de mandioca pela técnica casting com a suspensão de AgNPs, bem como analisar as características dos materiais poliméricos obtidos. Para tanto, as AgNPs foram obtidas utilizando-se 25mL de solução aquosa contendo 7,5% do extrato vegetal (macela), 2% ou 5% (v/v) de solução a 1% (m/v) do agente capeante (PVA ou PVP ou citrato de sódio) (com e sem ajuste de pH para 8,5), então 250mL de solução de nitrato de prata (0,02 mmol) foi gotejada na solução do extrato. As suspensões contendo as AgNPs foram caracterizadas por Uv-Vis, DLS, Potencial Zeta, TGA, DSC e atividade antimicrobiana pela técnica do disco difuso. Então três experimentos foram selecionados a partir da análise dos resultados do tamanho das nanopartículas, estabilidade da suspensão, e atividade antimicrobiana, portanto a suspensão destas AgNPs foi empregada para a obtenção dos filmes de amido de mandioca. O método casting foi utilizado, amido de mandioca foi dispersado na suspensão de AgNPs, aquecido sob agitação até a temperatura de gelatinização do amido, mantido por 10 minutos, ácido cítrico adicionado e após resfriamento do sistema para 60º C glicerol foi adicionado, o gel obtido foi vertido em formas de silicone e foram secos em estufa com circulação de ar à 50º C por 24 horas. Os filmes foram caracterizados por DSC, teste de tração, espessura, umidade, gramatura, solubilidade, e atividade antimicrobiana pela técnica do disco difuso. Através das análises de UV-Vis, DSC e TGA observou-se que a macela desempenhou um papel de agente redutor. Com a análise do DLS observamos o tamanho das partículas e através do Potencial Zeta a estabilidade da suspensão que sofreram influência da mudança de pH, do tipo e da concentração do agente capeante empregado, e foi possível verificar ainda que as suspensões de AgNPs obtidas apresentaram boa capacidade antimicrobiana. A técnica casting para obtenção dos filmes de amido contendo AgNPs se mostrou simples e adequada, e após a análise dos resultados de caracterização dos filmes verificou-se que os filmes obtidos apresentaram satisfatória atividade antimicrobiana, e que as AgNPs com os capeantes agiram de forma a deixar os filmes mais flexíveis, porém menos resistentes, podendo se sugerir que as AgNPs com capeantes funcionaram como plastificante. Assim, pode-se concluir que a síntese verde é um processo promissor para a obtenção de AgNPs, e que estas podem ser empregadas para a obtenção de filmes poliméricos antimicrobianos destinados por exemplo, para embalagens. 2022-02-22T15:19:11Z 2022-02-22T15:19:11Z 2021-12-01 bachelorThesis VANIN, Letícia Papaes. Obtenção e caracterização de embalagens antimicrobianas contendo nanopartículas de prata obtidas por síntese verde empregando extrato aquoso de macela (Achyrocline satureioides). 2021. Trabalho de Conclusão de Curso (Bacharelado em Engenharia de Alimentos) - Universidade Tecnológica Federal do Paraná, Campo Mourão, 2021. http://repositorio.utfpr.edu.br/jspui/handle/1/27237 por openAccess http://creativecommons.org/licenses/by-nc-nd/4.0/ application/pdf Universidade Tecnológica Federal do Paraná Campo Mourao Brasil Departamento Acadêmico de Alimentos e Engenharia Química Engenharia de Alimentos UTFPR
institution	Universidade Tecnológica Federal do Paraná
collection	RIUT
language	Português
topic	Nanopartículas Amido Agentes antiinfecciosos Camomila Embalagens Nanoparticles Starch Anti-infective agents German chamomile Packaging CNPQ::CIENCIAS AGRARIAS::CIENCIA E TECNOLOGIA DE ALIMENTOS
spellingShingle	Nanopartículas Amido Agentes antiinfecciosos Camomila Embalagens Nanoparticles Starch Anti-infective agents German chamomile Packaging CNPQ::CIENCIAS AGRARIAS::CIENCIA E TECNOLOGIA DE ALIMENTOS Vanin, Letícia Papaes Obtenção e caracterização de embalagens antimicrobianas contendo nanopartículas de prata obtidas por síntese verde empregando extrato aquoso de macela (Achyrocline satureioides)
description	Nanostructured materials have stood out in the market today and have different applicability. Among them are silver nanoparticles (AgNPs) that stand out in the food industry, in dental materials and packaging as they have excellent antimicrobial activity, good conductivity and have a high catalytic effect. As a result, green synthesis is currently being used as a sustainable alternative to replace chemical reagents and their environmental impact on the environment and health. Thus, the objective of this work was to synthesize and characterize AgNPs using the green synthesis process, using an aqueous macela extract, and to prepare cassava starch films by the casting technique with the suspension of AgNPs, as well as to analyze the characteristics of the polymeric materials obtained. Therefore, the AgNPs were obtained using 25mL of aqueous solution containing 7.5% of the plant extract (macela), 2% or 5% (v/v) of a 1% (m/v) capping agent solution (PVA or PVP or sodium citrate) (with and without pH adjustment to 8.5), then 250mL of silver nitrate solution (0.02 mmol) was dropped into the extract solution. Suspensions containing AgNPs were characterized by UV-vis, DLS, Zeta Potential, TGA, DSC and antimicrobial activity by the diffuse disk technique. Then 3 experiments were selected from the analysis of the results of nanoparticles size, suspension stability, and antimicrobial activity, then the suspension of these AgNPs was used to obtain cassava starch films. The casting method was used, where cassava starch was dispersed in the suspension of AgNPs, then the system was heated under stirring to the starch gelatinization temperature, kept for 10 minutes, then citric acid was added and after cooling the system to 60º Glycerol was added, the gel obtained was poured into silicone molds and dried in a study with air circulation at 50°C for 24 hours. The films were characterized by DSC, tensile test, thickness, moisture, weight, solubility, and antimicrobial activity by the diffuse disc technique. Through the analysis of UV-Vis, DSC and TGA it was observed that the macela played a role of reducing agent. With the DLS analysis we observed the particle size and through the Zeta Potential the stability of the suspension that were influenced by the change in pH, type and concentration of the capping agent used, and it was also possible to verify that the AgNPs suspensions obtained presented good antimicrobial ability. The casting technique to obtain starch films containing AgNPs proved to be simple and adequate, and after analyzing the results of the characterization of the films, it was verified that the films obtained presented satisfactory antimicrobial activity, and that the AgNPs with capping agents acted in such a way as to leaving the films more flexible, but less resistant, suggesting that AgNPs with capping acted as a plasticizer. Thus, it can be concluded that green synthesis is a promising process for obtaining AgNPs, and that these can be used to obtain antimicrobial polymeric films intended, for example, for packaging.
format	Trabalho de Conclusão de Curso (Graduação)
author	Vanin, Letícia Papaes
author_sort	Vanin, Letícia Papaes
title	Obtenção e caracterização de embalagens antimicrobianas contendo nanopartículas de prata obtidas por síntese verde empregando extrato aquoso de macela (Achyrocline satureioides)
title_short	Obtenção e caracterização de embalagens antimicrobianas contendo nanopartículas de prata obtidas por síntese verde empregando extrato aquoso de macela (Achyrocline satureioides)
title_full	Obtenção e caracterização de embalagens antimicrobianas contendo nanopartículas de prata obtidas por síntese verde empregando extrato aquoso de macela (Achyrocline satureioides)
title_fullStr	Obtenção e caracterização de embalagens antimicrobianas contendo nanopartículas de prata obtidas por síntese verde empregando extrato aquoso de macela (Achyrocline satureioides)
title_full_unstemmed	Obtenção e caracterização de embalagens antimicrobianas contendo nanopartículas de prata obtidas por síntese verde empregando extrato aquoso de macela (Achyrocline satureioides)
title_sort	obtenção e caracterização de embalagens antimicrobianas contendo nanopartículas de prata obtidas por síntese verde empregando extrato aquoso de macela (achyrocline satureioides)
publisher	Universidade Tecnológica Federal do Paraná
publishDate	2022
citation	VANIN, Letícia Papaes. Obtenção e caracterização de embalagens antimicrobianas contendo nanopartículas de prata obtidas por síntese verde empregando extrato aquoso de macela (Achyrocline satureioides). 2021. Trabalho de Conclusão de Curso (Bacharelado em Engenharia de Alimentos) - Universidade Tecnológica Federal do Paraná, Campo Mourão, 2021.
url	http://repositorio.utfpr.edu.br/jspui/handle/1/27237
_version_	1805311799642292224
score	10,814766

Obtenção e caracterização de embalagens antimicrobianas contendo nanopartículas de prata obtidas por síntese verde empregando extrato aquoso de macela (Achyrocline satureioides)

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