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Evaluation of the Antibacterial and Antifungal Capacity of Nanoemulsions Loaded with Synthetic Chalcone derivatives Di-Benzyl Cinnamaldehyde and Benzyl 4-Aminochalcone

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Journal of Renewable Materials 2024年第2期12卷 285-304页

作者： flavia Oliveira Monteiro da Silva Abreu Taysse Holanda Joice farias do Nascimento Henety Nascimento Pinheiro Rachel Menezes Castelo Hélcio Silva dos Santos Thais Benincá Patrícia da Silva Malheiros Júlio César Sousa Prado Raquel de Oliveira fontenelle maria madalena de camargo f.rte Natural Polymers Laboratory PPGCNState University of CearáFortaleza60.714.903Brazil Polymeric Materials Laboratory PPGE3MFederal University of Rio Grande do SulPorto Alegre91501-970Brazil Natural Product Chemistry Laboratory PPGCNState University of CearáFortaleza60.714.903Brazil food Hygiene and Microbiology Laboratory PPGCTAFederal University of Rio Grande do SulPorto Alegre91501-970Brazil Microbiology Laboratory Medicine SchoolFederal University of CearáSobral62010-560Brazil

With the increase in antimicrobial resistance,it has become necessary to explore alternative approaches for combating and preventing ***-cinnamaldehyde(CNM)and Benzyl4-amino(B4AM)are bioactive compounds derived from chalcones but with restricted solubility in aqueous *** can enhance the solubility of compounds and can be a promising alternative in the development of novel antimicrobials,with reduced side effects and prolonged *** objective of this study was to evaluate the stability of oil-in-water nanoemulsions loaded with two distinct types of chalcones at two different dosages,to propose a stable formulation with antimicrobial *** showed that nanoemulsions presented high encapsulation efficiency,low polydispersity index(PDI)and particle size below 200 nm,indicating that emulsification was a suitable method for nanoemulsion *** with higher dosages exhibited significant antimicrobial effects when compared to free chalcones and positive ***,B4AM nanoemulsions at higher dosages showed expressive activity against Salmonella minnesota,with a 420%greater inhibitory response compared to the free form and showing equivalence to the positive *** nanoemulsions showed excellent inhibitory activity at the highest dosage,equivalent to the positive control against *** and Staphylococcus *** greater number of conjugated bonds in CNM increased the antimicrobial activity in comparison with B4AM,and the formation of nanometric domains enhanced the bioavailability,being a promising alternative for antimicrobial applications.

关键词： Polysaccharide nanoemulsions S.aureus S.minnesota chalcones alginate

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Induced degradation of Polypropylene with an Organic Pro-degradant Additive

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材料科学与工程（中英文A版） 2013年第2期3卷 122-130页

作者： Larissa Stieven Montagna maria madalena de camargo f.rte Ruth Marlene Campomanes Santana Laboratory of Polymeric Materials Lapol of Federal University of Rio Grande do Sul 91.501-970 Porto Alegre Brazil

The aim of this study was to evaluate the effect of an organic pro-degradant additive on the degradation rate of polypropylene (PP) under biotic and abiotic conditions. The PP samples were processed by thermal compression molding (TCM). PP specimens in plate form were evaluated after being submitted to natural ageing and to simulated composting during 120 days. The PP samples were analyzed by viscosimetry, differential scanning colorimetry (DSC) and scanning electron microscopy (SEM). The organic additive was effective in the PP degradation as monitored through the decrease in the polymer molecular weight and variation in the crystallinity and morphology of the PP samples submitted to both conditions. The samples exposed to natural ageing showed a higher degree of crystallinity and lower molecular weight than the samples submitted to the simulated soil composting. The SEM analysis revealed a deterioration of the surface of the PP-modified samples after exposure to different environments.

关键词：有机添加剂降解物聚丙烯扫描电子显微镜薄膜样品诱导扫描电镜分析自然老化

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根据ISO/IEC 17025标准开展的美洲实验室认可现状

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中国认证认可 2022年第2期 35-38页

作者：伊内斯·赫克塞尔·格罗肖卡拉·施文博·坦卡滕玛丽亚·马达莱纳·德卡马戈·福特赵伟伟(译) 不详中国合格评定国家认可中心

在过去20年中,一些国家的政治和社会变化对国家监管提出了要求,特别是在健康和环境领域,这些变化也促进了国际贸易。拥有国际承认的认可实验室的国家由于其工艺和产品的资质以及贸易技术壁垒的消除而具有显著优势,其制定了国际协议,例... 详细信息

在过去20年中,一些国家的政治和社会变化对国家监管提出了要求,特别是在健康和环境领域,这些变化也促进了国际贸易。拥有国际承认的认可实验室的国家由于其工艺和产品的资质以及贸易技术壁垒的消除而具有显著优势,其制定了国际协议,例如由国际实验室认可合作组织发起的相互承认协议,以在全球范围内建立可接受的可比参数。

关键词：贸易技术壁垒 ISO/IEC 认可实验室实验室认可国际贸易全球范围显著优势国际实验室认可合作组织

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Use of fractals Channels to Improve a Proton Exchange Membrane fuel Cell Performance

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Journal of Energy and Power Engineering 2015年第8期9卷 727-730页

作者： Pablo Martin Belchor Paloma Barbieri Gabriel Benetti Evandro Mathias Mayra Klein Joao Bottin deyse Suman Carpenter maria madalena camargo f.rte department of Materials School of Engineering UFRGS (Federal University of Rio Grande doSul)/PPG3M (Postgraduate Program in Mining Metallurgy and Materials) Porto Alegre 91501-970 Brazil Exact and Technological Sciences UNOESC (University of Oeste de Santa Catarina) Campus II Joagaba 89600-000 Brazil department of Materials the FURB (Foundation Regional University of Blumenau) Campus 11 Blumenau 89030-000 Brazil

One of the most important and effective hardware elements for improvement of efficiency and power density of proton exchange membrane fuel cells is the flow field plate. The design and the pattern of the flow field plate have a considerable effect on the effectiveness of mass transport as well as on the electrochemical reactions inside the cell. The configuration of the flow field plate aims at ensuring a low pressure-drop over all channels in the stack. In this work, a fPffP (fractal parallel flow field plate), with bio-inspired configuration by insertion of fractals in a classic PffP (parallel flow field plate), is proposed, increasing the flow area of the hydrogen at anode side without increasing the section"s area of the flow field plate. By simulating was observed that, the use of channels in fractal shape can increase the hydrogen flow area without occuring pressure loss in the cell. The fluid dynamic behavior in the fPffP at smaller scales was replicated in the same plate, with better advantage of the active area of the electrode. Increasing the hydrogen flow area without causing pressure loss could be a good tactic to increase the power density of fuel cells, and consequently improving the cell performance.

关键词：质子交换膜燃料电池性能分形功率密度压力损失氢气流量流场板电化学反应

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