Spectroscopic Techniques
Mostrando 13-24 de 274 artigos, teses e dissertações.
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13. SYNTHESIS, CHARACTERIZATION AND ANTIMICROBIAL ACTIVITY OF NEW Cu (II), Co (II) AND Sn (II) COMPLEXES WITH THE SODIUM HYDROTRIS(2-MERCAPTOTHIAZOLYL)BORATE LIGAND
The emergence of antibiotic resistance among microbial pathogens is a serious public health problem, resulting in a constant need of discovering new antibiotics. For this purpose, we synthetized and determined the antimicrobial activity of copper (Cu), cobalt (Co), and tin (Sn) complexes coordinated with scorpionate ligand in a tridentate mode against microo
Quím. Nova. Publicado em: 2020-05
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14. Iridoides, triterpenos e outros constituintes das cascas do caule e flores de Tabebuia caraiba Bignoniaceae
The trunk bark of Tabebuia caraiba Bignoniaceae was found to contain four novel iridoids, 6-O-E-p-coumaroyljioglutin D (2), 6-O-E-p-coumaroyl-3-demethyl-3-O-ethyljioglutin D (3), 6-O-E-p-coumaroyl-1-demethyl-1-O-ethyljioglutin D (4), 7-O-E-p-coumaroyljiofuranaldehyde (5), three known iridoids, including one iridoid glucoside, jioglutin D (1), rehmaglutin D (
Quím. Nova. Publicado em: 2020-04
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15. Estimation of soil phosphorus availability via visible and near-infrared spectroscopy
ABSTRACT: Spectroscopic techniques have great potential to evaluate soil properties. However, there are still questions regarding the applicability of spectroscopy to analyze soil phosphorous (P) availability, especially in tropical soils with low nutrient contents. Therefore, this study evaluated the possibility to estimate P availability in soil and its po
Sci. agric. (Piracicaba, Braz.). Publicado em: 20/12/2019
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16. Chemical constituents from the fruits of Schisandra sphenanthera and their cytotoxicity activity
Abstract Schisandra sphenanthera Rehder & E.H. Wilson, Schisandraceae, is well known as a type of traditional medicine for the treatment of hepatitis, diarrhea and insomnia in Asia. It was also reported to have antiviral and anti-HIV activities. Using various chromatographic resins and isolation techniques, a new lignan (1), erythro-4-(3,4-dimethoxyphenyl)-4
Rev. bras. farmacogn.. Publicado em: 09/12/2019
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17. Morphological, phytochemical and anti-hyperglycemic evaluation of Brachychiton populneus
Abstract Brachychiton populneus (Schott & Endl.) R.Br., Malvaceae, is one of five Brachychiton species cultivated in Egypt. Little information was found concerning the morphological, phytochemical and biological investigations of B. populneus. Morphological investigations of B. populneus were performed on fresh and dried leaves. Air-dried, ground leafy branc
Rev. bras. farmacogn.. Publicado em: 09/12/2019
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18. ESQUARAÍNAS CIS E TRANS SUBSTITUÍDAS: APLICAÇÃO EXPERIMENTAL DA TEORIA DE GRUPO EM ESPECTROSCOPIA VIBRACIONAL
This work shows a practical application of the group theory to a relatively simple molecular system, as well its impact in the results obtained through vibrational spectroscopic techniques. Squaraines substituted by dicyanemethylene groups have been extensively studied, and after minor approaches in the sense to facilitate the point group determination, they
Quím. Nova. Publicado em: 05/12/2019
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19. AlradSpectra: a Quantification Tool for Soil Properties Using Spectroscopic Data in R
ABSTRACT Soil reflectance spectroscopy has become an innovative method for soil property quantification supplying data for studies in soil fertility, soil classification, digital soil mapping, while reducing laboratory time and applying a clean technology. This paper describes the implementation of a Graphical User Interface (GUI) using R named AlradSpectra.
Rev. Bras. Ciênc. Solo. Publicado em: 29/07/2019
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20. INFLUENCE OF PRETREATMENTS ON CRYSTALLINITY AND ENZYMATIC HYDROLYSIS IN SUGAR CANE RESIDUES
ABSTRACT This research evaluated the effect of different delignification pretreatments (enzymatic and organosolv), on the crystallinity and enzymatic hydrolysis of harvested sugar cane residues. The Crystallinity Index (CrI), the Relative Number of Intensity (Ir), the degree of cellulose mercerization (IIC-%), and the Global Index of Saccharification (GIS) w
Braz. J. Chem. Eng.. Publicado em: 15/07/2019
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21. Design, Synthesis, Trypanocidal Activity, and Studies on Human Album in Interaction of Novel S-Alkyl-1,2,4-triazoles
Chagas disease is a neglected tropical disease caused by the hemoflagellated parasite Trypanosoma cruzi (Kinetoplastida). The only available drug to treat chagasic patients in Brazil, the nitroheterocycle benznidazole, is effective solely during the acute phase of the infection. There is accordingly a need to develop new therapeutic tools for the treatment o
J. Braz. Chem. Soc.. Publicado em: 04/07/2019
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22. Chronic hypoglycemic effect and phytochemical composition of Smilax moranensis roots
ABSTRACT Smilax moranensis M.Martens & Galeotti, Smilacaceae, root is a medicinal plant used among the Chatinos in Oaxaca, Mexico, to control type 2 diabetes. The objectives of the study were to isolate the bioactive compounds from the roots of Smilax and evaluate the chronic hypoglycemic effect of the ethanol–water extract. The main compounds were isolate
Rev. bras. farmacogn.. Publicado em: 27/05/2019
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23. Flavonol Tri-O-glycoside and Other Chemical Constituents from Flowers of Aristolochia trulliformis
A new flavonol triglycoside, named kaempferol-3-O-β-D-glucopyranosyl-(1→4)-α-L-rhamnopyranosyl-(1→6)-β-D-glucopyranoside, was isolated from flowers of Aristolochia trulliformis (Aristolochiaceae) together with 15 known compounds, including six flavonoids and four lignans. The structures of the compounds were determined by spectroscopic analyses, inclu
J. Braz. Chem. Soc.. Publicado em: 08/04/2019
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24. Phenolic compounds from the rhizome of Renealmia nicolaioides Loes.: a new diarylheptanoid
Abstract: This study aims to identify phenolic compounds in dichloromethane and methanolic extracts of the rhizome of Renealmia nicolaioides collected in the North Region of Brazil. Two known diarylheptanoids, 1,7-bis(4-hydroxyphenyl)-(1E)-1-hepten-3-one (1), and 5R-1,7-bis(4-hydroxyphenyl)-1E-hepten-5-ol (2), and a new one (1R,2S,5S)-2-hydroxy-1,7(p-hydroxy
An. Acad. Bras. Ciênc.. Publicado em: 08/04/2019