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1.
Braz. j. biol ; 82: e241025, 2022. tab, graf
Article in English | MEDLINE, LILACS, VETINDEX | ID: biblio-1285594

ABSTRACT

Abstract The evolution of beauty market and personal care is constant in Brazil as well in the rest of the world. Technological advances have brought up nanotechnology to the cosmetological field, employing active principles at atoms enveloped by vesicles, in order to take the active principle precisely to the target tissue to optimize the results achieved because of the considerable ease to cross skin barriers. Manufacturing of nanotechnology cosmetics is confronted with low absorption capacity. One of the many active principle found in cosmetic industry is caffeine, a pseudoalkaloid from the xanthine group used as a stimulant with the mechanism of the lipolytic action. This active is widely used in ​​a esthetics and cosmetics field in treatments involving dysfunctions such as localized fat and fibroedema geloid. To work out perfectly, the principle active need to interact and create a set of factors that includes lipolysis intensification. The caffeine encapsulation in gel-based nanocosmetics has the purpose of taking this active up to the adipocyte, the target cell, for mentioned dysfunctions treatment. Thus, we aim to present a review of how has been, the use of caffeine in the production of cosmetics.


Resumo A evolução do mercado de beleza e cuidados pessoais é constante no Brasil e no resto do mundo. Os avanços tecnológicos trouxeram a nanotecnologia para o campo cosmetológico, empregando princípios ativos em átomos envolvidos por vesículas, a fim de levar o princípio ativo precisamente ao tecido alvo para otimizar os resultados alcançados devido à considerável facilidade de atravessar barreiras cutâneas. A fabricação de cosméticos nanotecnológicos é confrontada com baixa capacidade de absorção. Um dos muitos princípios ativos encontrados na indústria cosmética é a cafeína, um pseudoalocalóide do grupo xantina usado como estimulante no mecanismo da ação lipolítica. Este ativo é amplamente utilizado no campo da estética e dos cosméticos em tratamentos que envolvem disfunções, como gordura localizada e fibroedema gelóide. Para funcionar perfeitamente, o princípio ativo precisa interagir e criar um conjunto de fatores que inclui a intensificação da lipólise. O encapsulamento de cafeína em nanocosméticos à base de gel tem o objetivo de levar esse ativo até o adipócito, a célula alvo, para o tratamento de disfunções mencionado. Assim, objetivamos apresentar uma revisão de como tem sido o uso de cafeína na produção de cosméticos.


Subject(s)
Skin Absorption , Cosmetics , Brazil , Caffeine , Nanotechnology
2.
Einstein (Säo Paulo) ; 20: eRB5898, 2022. graf
Article in English | LILACS | ID: biblio-1360394

ABSTRACT

ABSTRACT The delivery of nucleic acids to cells is considered a crucial step for the success of genetic modifications aimed at therapeutic purposes or production of genetically modified animals. In this context, nanotechnology is one of the most promising fields of science, with the potential to solve several existing problems. Nanostructures have desirable characteristics to be used as carriers, such as nanometric size, large surface area, cell internalization capacity, prolonged and controlled release, among others. Genetically modified animals can contribute to the production of biopharmaceuticals, through the expression of high-associated-value molecules. The production of these animals, also known as biofactories, further enhances Brazilian agribusiness, since it allows adding value to the final product, and favors the integration between the agricultural market and the pharmaceutical sector. However, there is a growing concern about the safety and possible harmful effects of nanostructures, since data on the safe use of these materials are still insufficient. The objective of this review was to address aspects of the use of nanostructures, mainly carbon nanotubes as nucleic acid carriers, aiming at the production of genetically modified animals, with the certainty that progress in this field of knowledge depends on more information on the mechanisms of interaction between nanostructures, cells and embryos, as well as on its toxicity.


Subject(s)
Animals , Nucleic Acids , Nanotubes, Carbon , Nanostructures/toxicity , Nanostructures/chemistry , Drug Delivery Systems , Nanotechnology
3.
Arq. bras. oftalmol ; 84(3): 282-296, May-June 2021. tab, graf
Article in English | LILACS | ID: biblio-1248965

ABSTRACT

ABSTRACT This review is intended to describe the therapeutic approaches for corneal blindness, detailing the steps and elements involved in corneal wound healing. It also presents the limitations of the actual surgical and pharmacological strategies used to restore and maintain corneal transparency in terms of long-term survival and geographic coverage. In addition, we critically review the perspectives of anabolic agents, including vitamin A, hormones, growth factors, and novel promitotic and anti-inflammatory modulators, to assist corneal wound healing. We discuss the studies involving nanotechnology, gene therapy, and tissue reengineering as potential future strategies to work solely or in combination with corneal surgery to prevent or revert corneal blindness.(AU)


RESUMO O presente trabalho traz uma revisão das abordagens terapêuticas para a cegueira da córnea. O estudo detalha as etapas e os elementos envolvidos na cicatrização da córnea. Ele mostra as limitações das estratégias cirúrgicas e farmacológicas usadas para restaurar e manter a transparência da córnea em termos de sobrevida a longo prazo e alcance geográfico. As perspectivas dos agentes anabólicos, incluindo vitamina A, hormônios, fatores de crescimento e novos moduladores pró-mitóticos e anti-inflamatórios para auxiliar a cicatrização da ferida na córnea, são revisadas criticamente. Aqui, apresentamos estudos envolvendo nanotecnologia, terapia gênica e reengenharia de tecidos como possíveis estratégias futuras para atuar de maneira isolada ou combinada com a cirurgia da córnea para prevenir ou reverter a cegueira corneana.(AU)


Subject(s)
Humans , Blindness/prevention & control , Blindness/therapy , Corneal Injuries/prevention & control , Corneal Injuries/therapy , Stem Cells , Vitamin A/therapeutic use , Genetic Therapy/instrumentation , Nanotechnology/instrumentation , Intercellular Signaling Peptides and Proteins/therapeutic use , Hormones/therapeutic use , Anti-Inflammatory Agents/therapeutic use
4.
Article in English | WPRIM | ID: wpr-921384

ABSTRACT

Framework nucleic acid (FNA) is a set of DNA nanostructures characterized by the framework morphology. It can design rational DNA sequences and follow the principle of complementary base pairing to construct FNA. The recent discovery of FNA constructed by DNA nanotechnology has great application potential in the field of bone regene-ration. It plays a positive role in the osteogenic differentiation of stem cells, bone regeneration, vascular regeneration, neuromodulation, immune regulation, and drug delivery. Here, we reviewed the current study findings on FNA in the field of bone regeneration.


Subject(s)
Bone Regeneration , Nanostructures , Nanotechnology , Nucleic Acids , Osteogenesis , Tissue Engineering
5.
Arq. odontol ; 57: 236-243, jan.-dez. 2021. ilus, tab
Article in Portuguese | LILACS, BBO | ID: biblio-1348373

ABSTRACT

Objetivo:Avaliar in vitro a atividade de Staphylococcus aureus e Candida albicans em bases de próteses convencionais à base de polimetilmetacrilato de metila com nanopartículas de prata incorporadas a sua composição. Métodos: Foi realizado um estudo experimental laboratorial com resinas acrílicas autopolimerizáveis comercialmente disponíveis, Vipi Flash/VIPI e JET/Clássico. Foram confeccionados 80 corpos de prova, divididos em 16 grupos (n = 5), referentes ao tipo de resina, tratamento (incorporação e imersão na solução de nanopartículas de prata) e microrganismo inoculado. As nanopartículas foram sintetizadas com ácido polimetacrílico, nitrato de prata e irradiadas com luz ultravioleta de baixa potência (~8W) por 6 horas, e as suas concentrações idealizadas pelo método de microdiluição em placas para determinação da concentração mínima inibitória frente aos microrganismos selecionados. Verificou-se ação bactericida e fungicida com concentração inicial de 25% e após fator de diluição 12,5%. Resultados: Houve dificuldade de incorporação das nanopartículas na resina acrílica, que pode decorrer da alteração da proporção 3:1 recomendada pelo fabricante ou pela redução ou inativação da ação da nanopartícula de prata pela interação com o polimetilmetacrilato. VIPI com inclusão de nanopartícula obteve menor aderência de biofilme de Candida albicans. Conclusão:A nanopartícula de prata mostrou-se eficaz na sua ação de controle de Candida albicans e Staphylococcus aureus no método de imersão, entretanto, a sua ação antimicrobiana foi comprometida após inclusão nas resinas acrílicas.


Aim:To perform an in vitro evaluation of the activity of Staphylococcus aureus and Candida albicansin conventional prosthesis bases, based on methyl polymethylmethacrylate with silver nanoparticles incorporated into the composition. Methods: An experimental laboratory study was carried out using commercially available self-curing acrylic resins, Vipi Flash/VIPI and JET/Clássico. Eighty specimens were manufactured and divided into 16 groups (n = 5), referent to the resin brand, treatment (incorporation and immersion in the silver nanoparticle solution), and inoculated microorganism. The nanoparticles were synthesized with polymethacrylic acid and silver nitrate, and were irradiated with a low power (~ 8W) ultraviolet light for 6 hours. Their concentrations were idealized by the method of microplate dilution to determine the minimum inhibitory concentration when compared to the selected microorganisms. Bactericidal and fungicidal activities were identified with an initial concentration of 25% and a subsequent dilution factor of 12.5%. Results:It was difficult to incorporate the AgNPs into the acrylic resin, which may well have resulted from the change from the 3:1 proportion recommended by the manufacturer or by reducing or inactivating the action of the silver nanoparticle by interaction with polymethylmethacrylate. VIPI with the inclusion of nanoparticles obtained a lesser Candida albicans biofilm adherence. Conclusion: Silver nanoparticles were effective in controlling Candida albicans and Staphylococcus aureus in the immersion method; however, the antimicrobial activity was compromised after inclusion in acrylic resins.


Subject(s)
Silver Nitrate/pharmacology , Dental Prosthesis/microbiology , Polymethyl Methacrylate/pharmacology , Nanotechnology/methods , Nanoparticles/chemistry , Biological Control Agents/pharmacology , Staphylococcus aureus/drug effects , Candida albicans/drug effects , Anti-Infective Agents/pharmacology , Antifungal Agents/pharmacology
6.
Article in English, Portuguese | LILACS | ID: biblio-1358277

ABSTRACT

Introdução: A nanotecnologia consiste no controle e manipulação da matéria em nível atômico e molecular, permitindo o desenvolvimento de dispositivos, materiais e sistemas com propriedades diferentes daquelas observadas na escala micro ou macroscópica. Objetivo: Verificar evidências científicas sobre a efetividade dos medicamentos em pacientes com câncer pelo uso da nanotecnologia. Método: Trata-se de uma revisão integrativa da literatura. A busca de artigos foi realizada nas bases de dados MEDLINE (PubMed), LILACS, SciELO, Scopus, Web of Science e BVS. Não houve restrição de localização, período e idioma. Para a seleção dos estudos, foi utilizada a combinação baseada no Medical Subject Heading Terms (MeSH). Incluíram-se na pesquisa estudos que obtiveram pontuação ≥ a 6 pontos, segundo o protocolo para pontuação qualitativa. Resultados: Foram localizados 216 artigos, sendo totalizados 208 após verificação por duplicação. Em seguida, os títulos e resumos foram analisados, sendo excluídos 205 trabalhos fora do escopo da proposta da pesquisa. Admitiram- -se, para a análise final, três artigos do tipo estudo clínico. Os nanocomplexos apresentaram eficiência nas amostras apresentadas, sendo eficazes quando o objetivo consistia em retardar a progressão de determinados tipos de cânceres. Conclusão: Os medicamentos com nanopartículas utilizados nos estudos demonstraram boa adesão pelos pacientes, assim como se apresentaram eficazes no tratamento de cânceres específicos. Contudo, estudos adicionais são necessários para explorar a atividade desses medicamentos


Introduction: Nanotechnology consists of the control and manipulation of matter at atomic and molecular level, allowing the development of devices, materials, and systems with properties different from those observed in the micro or macroscopic scale. Objective: Verify scientific evidence about the effectiveness of drugs in patients with cancer utilizing nanotechnology. Method: Integrative review of the literature. The search for articles was carried out in the databases MEDLINE (PubMed), LILACS, SciELO, Scopus, Web of Science e BVS. There was no restriction of location, period, and language. For the selection of the studies, the combination based on the Medical Subject Heading Terms (MeSH) was used. Studies that scored ≥ 6 points according to the qualitative scoring protocol were included in the study. Results: 216 articles were found, and after the elimination of duplicates, 208 remained. The titles and abstracts were analyzed, and 205 papers were excluded because they were not within the scope of the proposed study. Three articles of the type clinical trial were admitted for the final analysis. The nano complexes showed efficiency in the samples presented, being effective when the objective was to delay the progression of certain types of cancers. Conclusion: Medications with nanoparticles used in the studies showed good adherence by the patients, in addition to effectiveness in the treatment of specific cancers. However, additional studies are needed to explore the activity of these drugs


Introducción: La nanotecnología consiste en el control y manipulación de la materia a nivel atómico y molecular, permitiendo el desarrollo de dispositivos, materiales y sistemas con propiedades diferentes a las observadas a escala micro o macroscópica. Objetivo: Verificar la evidencia científica sobre la efectividad de los medicamentos en pacientes con cáncer mediante el uso de nanotecnología. Método: Se trata de una revisión integrativa de la literatura. La búsqueda de artículos se realizó en las bases de datos MEDLINE (PubMed), LILACS, SciELO, Scopus, Web of Science e BVS. No hubo restricción de ubicación, período e idioma. Para la selección de estúdios, se utilizó la combinación basada en los Términos de Encabezamiento de Materia Médica (MeSH). Los estudios que puntuaron ≥ 6 puntos según el protocolo de puntuación cualitativa. Resultados: Se encontraron 216 artículos, con un total de 208 luego de la verificación por duplicación. Luego, se analizaron los títulos y resúmenes, y se excluyeron 205 artículos por no estar en el alcance de la propuesta de investigación. Se admitieron tres artículos del tipo estudio clínico para el análisis final. Los nano complejos mostraron eficiencia en las muestras presentadas, siendo efectivas cuando el objetivo era retrasar la progresión de ciertos tipos de cánceres. Conclusión: Los fármacos de nanopartículas utilizados en los estudios mostraron una buena adherencia por parte de los pacientes, además de ser eficaces en el tratamiento de cánceres específicos. Sin embargo, se necesitan estudios adicionales para explorar la actividad de estos fármacos


Subject(s)
Humans , Female , Nanotechnology , Nanotechnology/methods , Drug Utilization , Access to Essential Medicines and Health Technologies , Neoplasms
7.
Braz. arch. biol. technol ; 64: e21190387, 2021. tab, graf
Article in English | LILACS | ID: biblio-1153290

ABSTRACT

HIGHLIGHTS Production of lipid nanoemulsions (<100 nm) of industrial interest with low energy demand. The antioxidant properties of babassu oil have been improved and the nanoemulsions are not cytotoxic. Babassu oil is a food and medicinal product. The nanoemulsion is strategic for the developed of new antioxidants phytotherapeutics.


Abstract Background: Babassu oil is an extract from a Brazilian native coconut (Orbignya phalerata Martius) and is used both as a food and a medicinal product. Methods: we produced two babassu oil nanoemulsions and evaluated them regarding their nanoscopic stability, antioxidant activity and cytotoxicity.The nanoemulsions were characterized by Dynamic Light Scattering, and their stability was investigated for 120 days. The antioxidant activity was assessed by Spectroscopy Electron Paramagnetic Resonance, and the cytotoxicity was assessed by a colorimetric method (MTT) with the NIH/3T3 cell lineage. Results: the results showed nanoemulsions with average hydrodynamic diameter lower than 100 nm (p(0.001).and a polydispersity index of less than 0.3 (p(0.001), indicating monodisperse systems and good stability at room temperature. The exposure of nanoemulsions at varying pH revealed that the isoelectric point was at 3.0, and the images obtained by Transmission Electron Microscopy showed spherical droplets with a size 27 nm. The antioxidant activity showed that the babassu nanoemulsions exposed to free radicals had a better response when compared to the oil free samples. The cell viability assays showed low toxicity of the formulation with viability over 92% (p(0.05). Conclusion: babassu oil nanoformulations showed low polydispersity and kinetic stability with effective antioxidant action. Therefore, they can be promising for application in the food industry or as antioxidant phytotherapeutics.


Subject(s)
Palm Oil/chemistry , Nanotechnology , Antioxidants , Plant Extracts/chemistry , Food Industry , Cytotoxins , Microscopy, Electron, Transmission , Emulsions , Nanocomposites
8.
Article in Chinese | WPRIM | ID: wpr-880404

ABSTRACT

Breast cancer is one of the most serious diseases threatening women's life and health in the world, and the mortality rate is the second in the world. With the progress of nanotechnology and the advantages of nanomaterials in the field of electrochemistry and biosensor, various nanomaterials have been applied in electrochemical biosensors. This makes the electrochemical nano-biosensor in the field of rapid detection of breast cancer has been widely concerned and studied. This paper introduces the important components of electrochemical nano-biosensor for breast cancer detection and the research progress of each component in breast cancer detection, as well as the performance of electrochemical nano biosensor in breast cancer detection and the prospect of its application.


Subject(s)
Biosensing Techniques , Breast Neoplasms/diagnosis , Electrochemical Techniques , Female , Humans , Nanostructures , Nanotechnology
9.
Rev. Nutr. (Online) ; 33: e190165, 2020. tab, graf
Article in English | SES-SP, LILACS, SES-SP | ID: biblio-1136682

ABSTRACT

ABSTRACT Polyunsaturated fatty acids oxidize easily due to their chemical structure, causing a reduction of their nutritional properties. Nanostructured systems may be an alternative to protect fatty acids against oxidation, improving solubility and stability. Consequently, nutritional value of food is maintained as well as the sensory characteristics (color, flavor, texture, and aroma) when fatty acids are added to food products. The present study is a narrative review to introduce the potential benefits of omega-3 unsaturated fatty acids nanoparticles incorporated in food products. The literature review includes publications in English and Portuguese issued between March 1985 and March 2019, in PubMed, ScienceDirect and Web of Science databases. Manual searches were conducted in the articles references lists of the articles included to identify other relevant studies. There were studies that evaluated the stability of fatty acids in food products such as bread, fruit juice, milk, yogurt, and meat. In this study, the most used nanostructured systems for the incorporation of fatty acids were the nanocapsules and the nanoliposomes. Currently, the nanostructured system demonstrates a potential to improve protection of polyunsaturated fatty acids against oxidization and thermal degradation. In this way, they maintain their functional properties and their bioavailability increases and therapeutic efficacy and sensory properties are improved. There are several methodologies being tested, which makes it difficult to identify the most efficient formulation to protect fatty acids. Nanostructured systems seem to be the best alternative to protect polyunsatured fatty acids from oxidization. The encapsulation efficiency, particle's size and type are relevant factors to be considered to evaluate oxidization. In conclusion, the review showed that currently it is impossible to determine the most efficient methodology. Besides, nanoformulations should follow international guidelines to present more standardized and therefore more efficient particles.


RESUMO Os ácidos graxos poli-insaturados são facilmente oxidados devido à sua estrutura química, o que acarreta a diminuição de suas propriedades nutricionais. Nesse contexto, o sistema nanoestruturado pode ser uma alternativa para protegê-los contra a oxidação, melhorando a solubilidade e estabilidade. Consequentemente, quando são adicionados a produtos alimentares, o valor nutricional é mantido, bem como as características sensoriais (cor, sabor, textura e aroma). O presente estudo é uma revisão narrativa para apresentar os potenciais benefícios das nanopartículas com ácidos graxos insaturados da classe ômega-3 incorporados a produtos alimentícios. A literatura consultada incluiu publicações em inglês e em português, considerando o período entre março de 1985 e março de 2019, utilizando as bases de dados PubMed, ScienceDirect e Web of Science. Foram realizadas buscas manuais nas referências dos artigos incluídos, a fim de identificar outros estudos relevantes. Foram encontradas pesquisas que avaliaram a estabilidade dos ácidos graxos em produtos alimentícios, como pães, suco de fruta, leite, iogurte e carne. Neste estudo, as nanoestruturas mais utilizadas para a incorporação dos ácidos graxos foram as nanocápsulas e os nanolipossomas. Atualmente, o sistema nanoestruturado demonstra um potencial para melhorar a proteção desses ácidos poli-insaturados contra a oxidação e degradação térmica. Dessa forma, eles mantêm suas propriedades funcionais, aumenta-se sua biodisponibilidade e há melhora da eficácia terapêutica e das propriedades sensoriais. Existem diversas metodologias sendo testadas, o que dificulta a identificação de qual seria a formulação mais eficiente nessa proteção, mas os sistemas nanoestruturados parecem ser a melhor alternativa para proteger os ácidos graxos insaturados da oxidação. A eficiência de encapsulação bem como o tamanho e o tipo de partícula são fatores importantes a considerar na avaliação da oxidação. Em conclusão, a revisão demonstrou que atualmente a metodologia mais eficiente não é possível de ser identificada. Ademais, as nanoformulações devem seguir diretrizes do protocolo internacional para apresentar partículas mais padronizadas e, assim, eficientes.


Subject(s)
Fatty Acids, Omega-3 , Nanotechnology , Functional Food , Fatty Acids, Unsaturated
10.
Braz. dent. sci ; 23(2): 1-10, 2020.
Article in English | LILACS, BBO | ID: biblio-1095370

ABSTRACT

Objectives: Reviewing information available about platelet-rich plasma (PRP) applied to dental treatments, introducing the general concept of PRP, as well as analyzing actual data about, and challenges faced by, the dental field. Data & sources: The current study analyzed the most informative publications about PRP application available in this field and gathered the maximum information about it as possible. Conclusions: PRP use, either alone or in association with other biomaterials, can significantly favor different fields such as tissue engineering, since it is an innovative technique that attracts the interest of clinicians and basic scientists. However, it is necessary conducting better designed and controlled experiments to enable successful tissue healing based on PRP use. Clinical significance: The current review can be used by clinicians as source of information about the actual rules and protocols adopted in the herein addressed field, besides providing specific examples of such applications. (AU)


Objetivos: Revisar as informações disponíveis sobre o plasma-rico em plaquetas (PRP) aplicado a tratamentos odontológicos, introduzir o conceito geral de PRP e analisar dados reais sobre os desafios enfrentados pelo campo odontológico. Dados e fontes: O presente estudo analisou as publicações mais informativas sobre a aplicação do PRP disponíveis neste campo e reuniu o máximo de informações possível. Conclusões: O uso do PRP, isoladamente ou em associação com outros biomateriais, pode favorecer significativamente diferentes campos, como a engenharia de tecidos, uma vez que é uma técnica inovadora que atrai o interesse de clínicos e cientistas básicos. No entanto, é necessário realizar experimentos mais bem projetados e controlados para permitir a cura bem-sucedida dos tecidos com base no uso do PRP. Significado clínico: A revisão atual pode ser usada pelos médicos como fonte de informações sobre as regras e protocolos atuais adotados no campo aqui tratado, além de fornecer exemplos específicos de tais aplicações.(AU)


Subject(s)
Surgery, Oral , Platelet-Derived Growth Factor , Guided Tissue Regeneration, Periodontal , Nanotechnology , Platelet-Rich Plasma , Dental Atraumatic Restorative Treatment
11.
Braz. arch. biol. technol ; 63: e20190184, 2020. tab, graf
Article in English | LILACS | ID: biblio-1132268

ABSTRACT

Abstract Nanoparticles demonstrate an important role in the protection of bioactive compounds from external factors such as temperature, oxygen and light. In this study, poly-ε-caprolactone (PCL) nanoparticles entrapped β-carotene was produced using the nanoprecipitation method. Firstly, was evaluated the lipophilic surfactant effect and carrier agent of the active compound in the nanocapsules formulation. After choosing the most stable formulation, the nanocapsules production was optimized using β-carotene, caprylic/capric triglycerides (CCT) and soybean lecithin. Response surface methodology (RSM) was adopted to evaluate the influence of soy lecithin concentration, volume of CCT and β-carotene concentration in the particle size, zeta potential, polydispersity index (PDI), encapsulation efficiency and recovery. Formulations containing soy lecithin and CCT demonstrated better stability comparing to the other formulations tested. The nanoparticle formulations presented an optimized particle size below 200 nm, PDI lower than 0.1 and encapsulation efficiency above 95%. Based on the results obtained, the optimum conditions to prepare PCL nanocapsules were 0.2160 mg/mL of β-carotene, 232.42 μL of CCT and 2.59 mg/mL of soy lecithin, suggesting an applicability to promote controlled released of β-carotene in food system.


Subject(s)
Caproates , beta Carotene , Nanotechnology/methods , Nanocapsules , Lactones , Chemical Precipitation , Bioreactors , Process Optimization
12.
Braz. arch. biol. technol ; 63: e20200234, 2020. tab, graf
Article in English | LILACS | ID: biblio-1132219

ABSTRACT

Abstract Curcumin (CUR) shows potential use for treating cancer. However, CUR has low solubility and reduced bioavailability, which limit its clinical effect. Therefore, the development of nanocarriers can overcome these problems and can ensure the desired pharmacological effect. In addition, it is mandatory to prove the quality, the efficacy, and the safety for a novel nanomedicine to be approved. In that sense, this paper aimed (a) to prepare CUR-loaded polyethylene glycol-poly(ε-caprolactone) nanocapsules; (b) to validate an analytical method by high performance liquid chromatography (HPLC) for quantifying CUR in these nanoformulations; (c) to evaluate the physicochemical stability of these formulations; and to investigate their cytotoxicity on NIH-3T3 mouse fibroblast cells. The HPLC method was specific to CUR in the loaded nanocapsules, linear (r = 0.9994) in a range of 10.0 to 90.0 µg.mL-1 with limits of detection and quantification of 0.160 and 0.480 µg.mL-1, respectively. Precision was demonstrated by a relative standard deviation lower than 5%. Suitable accuracy (102.37 ± 0.92%) was obtained. Values of pH, particle size, polydispersity index, and zeta potential presented no statistical difference (p > 0.05) for CUR-loaded nanoparticles. No cytotoxicity was observed against NIH-3T3 mouse embryo fibroblast cell line using both the tetrazolium salt and sulforhodamine B assays. In conclusion, a simple and inexpensive HPLC method was validated for the CUR quantification in the suspensions of nanocapsules. The obtained polymeric nanocapsules containing CUR showed suitable results for all the performed assays and can be further investigated as a feasible novel approach for cancer treatment.


Subject(s)
Animals , Mice , Curcumin/pharmacology , Embryonic Stem Cells/drug effects , Fibroblasts/drug effects , Chromatography, High Pressure Liquid , Toxicity Tests , Nanotechnology , NIH 3T3 Cells , Embryo, Mammalian/cytology , Nanocapsules
13.
Int. j. morphol ; 37(4): 1564-1571, Dec. 2019. tab
Article in Spanish | LILACS | ID: biblio-1040170

ABSTRACT

Las glándulas salivales humanas pueden ser gravemente lesionadas por la radioterapia utilizada contra neoplasias de cabeza y cuello, produciendo hiposialia y xerostomía, las cuales afectan la salud oral y sistémica, mermando la calidad de vida de la persona. Los tratamientos convencionales actuales están diseñados para disminuir los síntomas, sin actuar sobre los cambios fisiopatológicos que se dan a nivel glandular. Esta revisión intenta analizar aquellas terapias preventivas y/o curativas que están desarrollándose en el campo biomolecular y que tienen un futuro prometedor por sus características innovadoras: terapia génica, terapia con células madre y terapia con factores de crecimiento. Se evidencia un aporte adicional de la nanotecnología, la cual está mejorando las vías de aplicación de los tratamientos.


Human salivary glands can be seriously injured by the radiotherapy used against head and neck neoplasms, producing hyposialia and xerostomy, which affect oral and systemic health, diminishing the person's quality of life. Current conventional treatments are designed to reduce symptoms, without acting on the pathophysiological changes that occur at the glandular level. This review attempts to analyze those preventive and /or curative therapies that are developing in the biomolecular field and that have a promising future due to their innovative features: Gene therapy, stem cell therapy and growth factor therapy. An additional contribution of nanotechnology is evident, which is improving the routes of treatment application.


Subject(s)
Humans , Radiotherapy/adverse effects , Salivary Gland Diseases/prevention & control , Stem Cells/physiology , Genetic Therapy/methods , Intercellular Signaling Peptides and Proteins/therapeutic use , Radiation Injuries/prevention & control , Radiation-Protective Agents/therapeutic use , Salivary Gland Diseases/therapy , Salivary Glands/radiation effects , Xerostomia/prevention & control , Nanotechnology
14.
E-Cienc. inf ; 9(2): 121-140, jul.-dic. 2019.
Article in Spanish | LILACS, SaludCR | ID: biblio-1089870

ABSTRACT

RESUMEN La designación tecnologías convergentes hace referencia a la confluencia de la iencia computacional con campos tecnocientíficos como la Nanotecnología, la Biotecnología y las Ciencias Cognitivas. El objetivo de este trabajo es señalar y analizar los vínculos que guardan estas tecnologías convergentes con la Bibliotecología -que también recurre al uso de las tecnologías de la información y la comunicación-, ya sea en términos metodológicos, conceptuales o de aplicación. Como principal conclusión se deduce que la Nanotecnología, la Biotecnología y las Ciencias Cognitivas han reconfigurado, en los últimos años, sus propios conceptos de información. Esto ha hecho que profesionales de otras disciplinas, que tienen por objeto de estudio a la información, se detengan a re-pensar su naturaleza, dinámica y utilización.


ABSTRACT The denomination convergent technologies refers to the confluence of computational science with techno-scientific fields such as nanotechnology, biotechnology and cognitive sciences. The objective of this work is to point out and analyze the links that these convergent technologies keep with Library Science (which also uses the information and communication technologies), either in methodological, conceptual or application terms. The main conclusion is that both nanotechnology, biotechnology and cognitive sciences have reconfigured their own conceptuation of information in recent years. This has caused professionals from other disciplines, who study information, to stop to rethink its nature, dynamics and use.


Subject(s)
Biotechnology , Cognitive Science , Nanotechnology , Scientific and Technical Activities , Information Technology Management , Library Science , Communication , Biological Evolution
15.
Rev. bioét. (Impr.) ; 27(4): 587-594, out.-dez. 2019.
Article in Portuguese | LILACS | ID: biblio-1057429

ABSTRACT

Resumo Este artigo trata das interfaces entre bioética e saúde coletiva, que têm como principal denominador comum a conflituosidade que afeta a garantia da saúde como direito em meio cultural plural. Como campos interdisciplinares, tanto bioética quanto saúde coletiva são aqui entendidas como empreendimentos científicos e práticos situados em seu tempo. Representam esforço científico de compreender - para transformar - um mundo complexo e dinâmico e são reflexo desta mesma complexidade. Para demonstrar como esses campos se entrecruzam em suas formas de análise e articulações teóricas, toma-se o exemplo da nanotecnologia, abordada aqui como objeto-modelo que ilustra a maneira pelas quais as novas biotecnologias interceptam e transformam iniquidades já existentes, determinando novas representações que o ser humano tem de si, de sua saúde e de sua doença.


Abstract This article deals with the interfaces between bioethics and collective health, which has as the main common denominator the conflicts that affects the right to health in a plural cultural environment. Being interdisciplinary fields, both bioethics and collective health are here understood as practical and scientific endeavours within their times. They represent a scientific effort to comprehend - in order to transform - a complex and dynamic world, and are a reflex of that same complexity. In order to show how these fields interconnect regarding their forms of analysis and theoretic articulations, we will use the example of nanotechnology, approached here as an object-model that illustrates the ways in which new biotechnologies cut through and transform already existing iniquities, thus determining novel representations human beings have of themselves, their health and their diseases.


Resumen El artículo aborda los cruces entre bioética y salud colectiva, que tienen como denominador común principal la conflictividad que afecta la garantía de la salud como un derecho en un medio cultural plural. Como campos interdisciplinarios, tanto la bioética como la salud colectiva son aquí entendidas como iniciativas científicas y prácticas situadas en su tiempo. Representan el esfuerzo científico de comprender - para transformar - un mundo complejo y dinámico, y son reflejo de esta misma complejidad. Para demostrar cómo estos campos se entrecruzan en sus formas de análisis y de articulación teórica, se toma el ejemplo de la nanotecnología, abordada aquí como un objeto-modelo que ilustra la manera en que las nuevas biotecnologías interceptan y transforman inequidades ya existentes, determinando nuevas representaciones que el hombre tiene de sí mismo, de su salud y de su enfermedad.


Subject(s)
Bioethics , Public Health , Nanotechnology
16.
Acta amaz ; 49(3): 246-255, jul. - set. 2019.
Article in English | LILACS | ID: biblio-1119059

ABSTRACT

Advances in nanotechnology, combined with the use of natural products, represent a promissing research field. Brazil is a country of a rich biodiversity, especially in the Amazon forest. Fruits commonly used by local communities, such as bacaba (Oenocarpus bacaba), are potentially important for prospection of industrial applications of natural products. In nanotechnology, microemulsions stand out for providing a modified release to conveyed substances. This work aimed to develop microemulsionated formulations of bacaba oil, characterize them and evaluate their stability. We determined the HLB (hydrophile-lipophilic balance) of bacaba oil for formulation development. Six formulations were selected from pseudoternary diagrams, which indicated the proportions of surfactants, aqueous phase and bacaba oil. The viability of these formulations was evaluated through stability tests. We provided the rheological characterization of the formulations, evaluated their potential antioxidant activity through the DPPH (2,2-diphenyl-1-picrylhydrazyl) radical scavenging method, and determined the hydrodynamic diameter of the droplets. The microemulsions were stable throughout the test period. Droplet diameter was below 200 nm, and the microemulsions were characterized as newtonian fluids, presenting an increase in antioxidant activity when compared with the diluted oil. Our results confirm the potential of bacaba oil in microemulsionated formulation as a suitable carrier for active compounds. (AU)


Subject(s)
Amazonian Ecosystem , Nanotechnology , Emulsifying Agents/analysis , Fruit
17.
E-Cienc. inf ; 9(1): 152-182, ene.-jun. 2019. tab, graf
Article in English | LILACS, SaludCR | ID: biblio-1089861

ABSTRACT

ABSTRACT Over the years, technological advancements have led to rapid growth of smart environments (offices, homes, cities, etc.). The increase of intelligent environments suggests the interconnectivity of applications and the use of the Internet. For this reason, arise what is known as the Internet of Things (IoT). The expansion of the IoT concept gives access to the Internet of Nano Things (IoNT). A new communication networks paradigm based on nanotechnology and IoT, in other words, a paradigm with the capacity to interconnect nano-scale devices through existing networks. This new paradigm so-called IoNT is presented to the world as an option for various fields of application. Therefore, new challenges and research opportunities have arisen. Consequently, this work aims to investigate state of the art and analyze trends for the use of IoNT, its application and future challenges in different fields of social interest, because IoNT is presented as an option for research with the capacities needed to get involved in many fields of social welfare. It is concluded that technologies prevail current IoNT literature, applications are focused on health care, and there is no international standardization regarding privacy, security or architecture of nano-networks.


RESUMEN A través de los años, los avances tecnológicos han llevado a un rápido crecimiento de entornos inteligentes (oficinas, hogares, ciudades, etc.). El aumento de entornos inteligentes sugiere la interconectividad de las aplicaciones y el uso de la Internet. Por esta razón, surge lo que se conoce como Internet de las cosas (IoT, por sus siglas en inglés). La ampliación del concepto IoT brinda acceso a la Internet de las nano cosas (IoNT, por sus siglas en inglés), un nuevo paradigma de redes de comunicación basado en nanotecnología y IoT, en otras palabras, un paradigma con la capacidad de interconectar dispositivos a nano escala a través de redes existentes. Este nuevo paradigma denominado IoNT se presenta al mundo como una opción para diversos campos de aplicación. Por lo tanto, surgen nuevos desafíos y oportunidades de investigación. En consecuencia, este trabajo tiene como objetivo investigar el estado del arte y analizar las tendencias para el uso de IoNT, su aplicación y los desafíos futuros en diferentes campos de interés social, debido a que IoNT se presenta como una opción para la investigación con las capacidades necesarias para involucrarse en muchos campos del bienestar social. Se concluye que la literatura actual de IoNT está prevalecida por las tecnologías, las aplicaciones se enfocan en el cuidado de la salud y no se dispone de una estandarización internacional en cuanto a la privacidad, seguridad o la arquitectura de las nano redes.


Subject(s)
Computer Communication Networks , Enacted Statutes , Nanotechnology , Internet of Things/trends , Health , Nanostructures , Internet Access , Internet Use
18.
Electron. j. biotechnol ; 38: 49-57, Mar. 2019. tab, graf, ilus
Article in English | LILACS | ID: biblio-1051388

ABSTRACT

BACKGROUND: This paper presents micro- and nano-fabrication techniques for leachable realgar using the extremophilic bacterium Acidithiobacillus ferrooxidans (A. ferrooxidans) DLC-5. RESULTS: Realgar nanoparticles of size ranging from 120 nm to 200 nm were successfully prepared using the highenergy ball mill instrument. A. ferrooxidans DLC-5 was then used to bioleach the particles. The arsenic concentration in the bioleaching system was found to be increased significantly when compared with that in the sterile control. Furthermore, in the comparison with the bioleaching of raw realgar, nanoparticles could achieve the same effect with only one fifth of the consumption. CONCLUSION: Emphasis was placed on improving the dissolvability of arsenic because of the great potential of leachable realgar drug delivery in both laboratory and industrial settings


Subject(s)
Arsenic/metabolism , Sulfides/metabolism , Acidithiobacillus/metabolism , Mining/methods , Arsenic/chemistry , Solubility , Sulfides/chemistry , Temperature , Nanotechnology , Nanoparticles/chemistry , Extremophiles
19.
Pesqui. bras. odontopediatria clín. integr ; 19(1): 4002, 01 Fevereiro 2019. tab, ilus, graf
Article in English | LILACS, BBO | ID: biblio-998179

ABSTRACT

Objective: To evaluate the use of nanosilver fluoride in the enamel remineralization process through optical coherence tomography. Material and Methods: All samples were submitted to demineralization process by pH cycling during 14 days and randomly distributed into three groups (n = 11): Nanosilver Fluoride (NSF), Sodium fluoride (NaF), and negative control. Optical coherence tomography images were acquired at three different moments: initial stage (T0), post caries formation (T1), and post pH cycling (T2). The integrity of the enamel surface and the measurement of the volume loss for the tissue after pH cycling in comparison to initial images were obtained from optical coherence tomography images. Results: After analyzing the exponential decay of A-scans from each group, it was possible to identify differences in light propagation among samples. In T1 it is not possible to visualize the dentin-enamel junction, probably due to the higher back scattering of the demineralized enamel, which does not allow light to reach the dentin. The decay curves obtained from NaF and nanosilver fluoride groups showed similar behavior, while the negative group showed lower extinction coefficient. Conclusion: Nanosilver fluoride showed the best effect against caries compared to conventional fluoride treatments.


Subject(s)
Tooth Demineralization/diagnosis , Nanotechnology/methods , Dental Enamel , Tomography, Optical Coherence/methods , Fluorides , In Vitro Techniques/methods , Brazil
20.
Article in Chinese | WPRIM | ID: wpr-774131

ABSTRACT

Despite the continuous improvement in perioperative use of antibiotics and aseptic techniques, the incidence of infection continues to rise as the need for surgery increasing and brings great challenges to orthopedic surgery. The rough or porous structure of the prosthesis provides an excellent place for bacterial adhesion, proliferation and biofilm formation, which is the main cause of infection. Traditional antibiotic therapy and surgical debridement are difficult to determine whether the infected focus have been removed completely and whether the infection will recur. In recent years, nanotechnology has shown obvious advantages in biomaterials and drug delivery. Nano drug carriers can effectively achieve local antimicrobial therapy, prevent surgical infection by local sustained drug release or intelligent controlled drug release under specific stimuli, and reduce the toxic side effects of drugs. The unique advantages of nanotechnology provide new ideas and options for the prevention and treatment of periprosthetic infection. At present, the application of nano-technology in the prevention and treatment of infection can be divided into the addition of nano-drug-loaded materials to prosthesis materials, the construction of drug-loaded nano-coatings on the surface of prosthesis, the perfusable nano-antimicrobial drug carriers, and the stimulation-responsive drug controlled release system. This article reviews the methods of infection prevention and treatment in orthopaedic surgery, especially the research status of nanotechnology in the prevention and treatment of periprosthetic infection.


Subject(s)
Anti-Infective Agents , Bacterial Adhesion , Drug Carriers , Humans , Nanotechnology , Orthopedics , Prosthesis-Related Infections
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