Edxrf
Mostrando 1-12 de 60 artigos, teses e dissertações.
-
1. Characterization of Commercially Available Turmeric for Use in Pharmaceutical Products and Food Supplements
We addressed some physicochemical and biological differences in commercial turmeric, acquired from both handling pharmacies and stores selling natural products for quality assessment. For this, it was determined the melting point, antioxidant activity by 2,2-diphenyl-1-picryl-hydrazyl-hydrate (DPPH), antimicrobial activity via the agar disk-diffusion assay,
Journal of the Brazilian Chemical Society. Publicado em: 2022
-
2. CLOROFILA EXTRAÍDA DE RESÍDUO INDUSTRIAL DA ERVA-MATE (Ilex paraguaiensis) UMA POSSIBILIDADE DE ECONOMIA CIRCULAR
Chlorophyll is the most abundant green pigment on the planet, it is unstable and decomposes naturally. Mate-herb is a traditional native plant in the southern region of South America, and its tea is part of the local culture and extractive agriculture. The mate-herb industry generates as a by-product a resinous material rich in chlorophyll whose use is propo
Química Nova. Publicado em: 2022
-
3. Direct Solid Sample Analysis of Medicinal Herbs for Determination of Ba, Cu, Ni, V and Zn by EDXRF
In this work, an analytical method for determination of Ba, Cu, Ni, V, and Zn, in medicinal herbs, through direct solid sample analysis by energy dispersive X-ray fluorescence spectrometry (EDXRF), was applied. Accuracy and precision (intra and inter day) of the analytical method were confirmed through analysis of certified reference material, tomato leaves
J. Braz. Chem. Soc.. Publicado em: 2021-01
-
4. What to Expect for the New Year?
In this work, an analytical method for determination of Ba, Cu, Ni, V, and Zn, in medicinal herbs, through direct solid sample analysis by energy dispersive X-ray fluorescence spectrometry (EDXRF), was applied. Accuracy and precision (intra and inter day) of the analytical method were confirmed through analysis of certified reference material, tomato leaves
J. Braz. Chem. Soc.. Publicado em: 2021-01
-
5. Aplicações da arqueometria no mobiliário de São Paulo do século XVIII: análises indiciárias e contextualização histórica
RESUMO Neste artigo, são apresentados os resultados dos exames arqueométricos de Física aplicada sobre duas peças de mobiliário do acervo do Museu Paulista, uma arca-cofre e uma cadeira de couro de sola feitas por volta do século XVIII. As técnicas de análise utilizadas foram o ED-XRF e o imageamento com fluorescência de luz ultravioleta. As anális
An. mus. paul.. Publicado em: 05/12/2019
-
6. CHARACTERIZATION OF SILICON-ALUMINUM-ZIRCONIUM OXIDE OBTAINED BY THE SOL-GEL PROCESS
A new silicon-aluminum-zirconium ternary oxide (SiO2/Al2O3/ZrO2) was prepared by the sol-gel method followed by one-step washing with absolute ethanol or two-step washing with absolute ethanol followed by ultra-pure water. Both ternary oxides presented high surface area (over 340 m2 g-1). The binding energy values for Zr3d and Al2p levels showed the insertio
Quím. Nova. Publicado em: 18/07/2019
-
7. Effects of experimental bleaching agents on the mineral content of sound and demineralized enamels
Abstract High concentrations of hydrogen peroxide can cause adverse effects on composition and structure of teeth. However, the addition of calcium and fluoride in bleaching agents may reduce enamel demineralization. Objective: To evaluate chemical changes of sound and demineralized enamels submitted to high concentrations of hydrogen peroxide containing fl
J. Appl. Oral Sci.. Publicado em: 04/10/2018
-
8. COMPOSIÇÃO QUÍMICA DA MADEIRA DE Cordia trichotoma (Vell.) Arráb. ex Steud.
RESUMO Há variações nas composições químicas, físicas e na anatomia da madeira, entre espécies e também dentro da mesma espécie, as quais variam significativamente com a altura do tronco e na direção da medula até a casca. O objetivo do presente trabalho foi analisar a composição química da madeira de Cordia trichotoma. Foram analisadas três
Ciênc. Florest.. Publicado em: 2017-12
-
9. Molecular and morphological surface analysis: effect of filling pastes and cleaning agents on root dentin
Abstract The quality of the dentin root is the most important factor for restoration resin sealing and drives the outcome of endodontic treatment. Objective This study evaluated the effect of different filling pastes and cleaning agents on the root dentin of primary teeth using Fourier-transformed Raman spectroscopy (FT-Raman), micro energy-dispersive X-ra
J. Appl. Oral Sci.. Publicado em: 2017-02
-
10. Energy Dispersive X-Ray Fluorescence Profile of Some Brazilian Postage Stamps
An energy dispersive X-ray fluorescence (EDXRF) analysis has been performed on Brazilian postage stamps to understand the elementary profile present in the paper, colored and postmarked areas, of stamps printed between 1850 and 1922. The EDXRF technique offered a fast, simple and nondestructive chemical analysis providing a profile of each postage stamp that
J. Braz. Chem. Soc.. Publicado em: 2016-06
-
11. Caracterização do material particulado suspenso no ar de Cuiabá-MT no período de queimadas
A caracterização química e morfológica do material particulado suspenso no ar da cidade de Cuiabá - MT, no período de queimadas do ano de 2012, foi realizada utilizando-se as técnicas de Microscopia Eletrônica de Varredura acoplada a um sistema de Microanálise de Raios X (SEM/EDS) e Fluorescência de Raios X por Dispersão em Energia(EDXRF). Deve se
Matéria (Rio J.). Publicado em: 2015-03
-
12. Analytical performance of new mixed oxide (SiO2/TiO2/ZnO)-based sorbent for development of a reliable mechanized enrichment system for copper determination in water and food samples
No presente estudo, um novo material compósito (SiO2/TiO2/ZnO) foi avaliado para pré-concentração de cobre em amostras de água e alimentos. O sorvente foi caracterizado por microscopia eletrônica de varredura (SEM), infravermelho com transformada de Fourier (FT-IR), análise de dados texturais, fluorescência de raios X por energia dispersiva (EDXRF) e
J. Braz. Chem. Soc.. Publicado em: 2014-11