scholarly journals Molecularly imprinted polymeric coatings for sensitive and selective gravimetric detection of artemether

RSC Advances ◽  
2020 ◽  
Vol 10 (57) ◽  
pp. 34355-34363
Author(s):  
Usman Arshad ◽  
Adnan Mujahid ◽  
Peter Lieberzeit ◽  
Adeel Afzal ◽  
Sadia Zafar Bajwa ◽  
...  
Keyword(s):  
Methyl Ether ◽  
Antimalarial Drugs ◽  
Polymeric Coatings ◽  
Molecularly Imprinted ◽  
Chemical Structures ◽  
Ether Derivative

Chemical structures of the antimalarial drugs: artemisinin, artemether (a methyl ether derivative of artemisinin), and lumefantrine.

Bioactivity of Flavonoids Isolated from Lychnophora markgravii against Leishmania amazonensis Amastigotes

2009 ◽  
Vol 64 (7-8) ◽  
pp. 509-512 ◽  
Author(s):  
Marcos José Salvador ◽  
Fabiana Terezinha Sartori ◽  
Ana Claudia B. C. Sacilotto ◽  
Elizabeth M. F. Pral ◽  
Silvia Celina Alfieri ◽  
...  
Keyword(s):  
Methyl Ether ◽  
Spectroscopic Data ◽  
Leishmania Amazonensis ◽  
Active Compounds ◽  
Esi Ms ◽  
Chemical Structures ◽  
Chromatographic Techniques ◽  
Aerial Parts ◽  
Leishmania Amastigotes

The bioactivity of the flavonoids pinostrobin (1), pinocembrin (2), tectochrysin (3), galangin 3-methyl ether (4), and tiliroside (5) isolated from Lychnophora markgravii aerial parts was investigated in vitro against amastigote stages of Leishmania amazonensis. The compounds were isolated by several chromatographic techniques and their chemical structures were established by ESI-MS and NMR spectroscopic data. The flavonoids 1 and 3 were the most active compounds; they markedly reduced the viability of Leishmania amastigotes.

A revision of the structures proposed for the melicope extractives, melicopol and methylmelicopol

1973 ◽  
Vol 26 (11) ◽  
pp. 2459 ◽  
Author(s):  
BS Balgir ◽  
LN Mander ◽  
STK Mander
Keyword(s):  
Methyl Ether ◽  
Partial Methylation ◽  
Ether Derivative

2,4,6-Trihydroxybenzoic acid was converted by partial methylation, formylation, and then reduction into methyl 2-hydroxy-3-hydroxymethyl- 4,6-dimethoxybenzoate (5) which proved different from dimethyldegeranylmelicopol. Methyl 6-geranyloxy-2-hydroxy-3- hydroxymethyl-4-methoxybenzoate (4), its neryl analogue (7), and methyl 4-geranyloxy-2-hydroxy-3-hydroxymethyl-6-methoxybenzoate (21) were prepared similarly but all were different from methylmelicopol. From a re-investigation of earlier work, melicopol and methylmelicopol were assigned new structures, 6?-geranyloxy-2,2?,4?-tri-hydroxy-3?- methoxyacetophenone (31) and its 4?-methyl ether derivative (24), respectively. Dimethyldegeranylmelicopol, 2,6?-dihydroxy-2?,3?,4?- trimethoxyacetophenone (25), was prepared from antiarol (28) and acetoxyacetonitrile.

LIGNANS OF WESTERN RED CEDAR (THUJA PLICATA DONN): IV. THUJAPLICATIN AND THUJAPLICATIN METHYL ETHER

1966 ◽  
Vol 44 (13) ◽  
pp. 1541-1545 ◽  
Author(s):  
Harold MacLean ◽  
Koji Murakami
Keyword(s):  
Thin Layer ◽  
Methyl Ether ◽  
Hot Water ◽  
The Other ◽  
Thuja Plicata ◽  
Chemical Structures ◽  
Red Cedar ◽  
Degradation Analysis ◽  
Western Red Cedar ◽  
Thuja Plicata Donn

In addition to the already known plicatic acid and plicatin, five new lignans have been separated by thin-layer and column chromatography from the hot-water extractive of western red cedar (Thujaplicata Donn) heartwood, and two chemical structures have been identified. These are 2-(4″-hydroxy-3″,5″-dimethoxybenzyl)-3-(4′-hydroxy-3′-methoxybenzyl)-butyrolactone (thujaplicatin methyl ether) (I) and 2-(3″,4″-dihydroxy-5″-methoxybenzyl)-3-(4′-hydroxy-3′-methoxybenzyl)-butyrolactone (thujaplicatin) (II). The former is the first known example of a lignan containing a guaiacyl and a syringyl nucleus and the first example of a syringyl-group lignan isolated from a conifer. Proof of structure by synthesis, degradation, analysis, and various spectra is presented. The other components which apparently belong to this lignan series are still being investigated.

scholarly journals FLAVONOIDS ISOLATED FROM THE FLOWERS OF CAMELLIA CHRYSANTHA

2019 ◽  
Vol 57 (3) ◽  
pp. 287
Author(s):  
Hong Van Thi Nguyen ◽  
Bach Cao Pham ◽  
Inh Thi Cam ◽  
Phuong Lan Doan ◽  
Thanh Tat Le ◽  
...  
Keyword(s):  
Data Analysis ◽  
Methyl Ether ◽  
Spectroscopic Data ◽  
Chemical Constituents ◽  
Health Benefits ◽  
Small Tree ◽  
Evergreen Shrub ◽  
Chemical Structures ◽  
The Family ◽  
First Time

Camellia chrysantha (the golden camellia, golden tea) is a species of evergreen shrub or small tree belonging to the family Theaceae. The flowers and the leaves of this plant are used as tea and drank for its health benefits. The aim of this study was to investigate the chemical constituents of the flowers of Camellia chrysantha. Five flavonoids were isolated from the flowers of Camellia chrysantha (Theaceae), including (+)-catechin (1), (-)-epicatechin (2), quercetin (3), quercetin-3-O-methyl ether (4) and kaempferol (5). Their chemical structures were elucidated by spectroscopic data analysis and by comparison with those reported in the literature. Among five compounds, compounds 4 was isolated for the first time from this species.

An Alternative Route to 2-Bromo-Estradiols and 2-Iodo-Estradiols From Estradiol

1987 ◽  
Vol 40 (2) ◽  
pp. 303 ◽  
Author(s):  
DJ Pert ◽  
DD Ridley
Keyword(s):  
Methyl Ether ◽  
Alternative Route ◽  
Reaction Conditions ◽  
Careful Choice ◽  
Ether Derivative ◽  
Trimethylsilyl Derivatives

Through careful choice of reaction conditions, alkylation of estradiol with chloromethyl methyl ether may yield either the 3,17β-bis(methoxymethy1) ether or the 3-methoxymethyl ether derivative. Treatment of either of these protected estradiols with s- butyllithium, then with trimethylsilyl chloride affords, regioselectively, the 2-trimethylsilyl derivatives which can conveniently be converted into 2-bromo-or 2-iodo-estradiol.

THE PHARMACOLOGICAL ACTIONS OF CAPAURINE

1944 ◽  
Vol 22e (3) ◽  
pp. 64-66 ◽  
Author(s):  
A. K. Reynolds ◽  
R. A. Waud
Keyword(s):  
Smooth Muscle ◽  
Methyl Ether ◽  
Plant Family ◽  
Ether Derivative ◽  
Central Origin ◽  
Convulsant Drug

The pharmacological actions of a new alkaloid, capaurine, and its O-methyl ether derivative have been studied. Capaurine was isolated from Corydalis aurea, a member of the plant family Fumariaceae, which is indigenous to Canada.The base produces paralysis in frogs and convulsions in mice and rabbits, both effects being of central origin. The heart is depressed as is the smooth muscle of the intestine and uterus. Capaurine O-methyl ether is a convulsant drug exhibiting actions on the heart and smooth muscle quite similar to those of the alkaloid itself.

Chemical structure of diamond-like carbon thin films

1990 ◽  
Vol 48 (4) ◽  
pp. 710-711
Author(s):  
N.-H. Cho ◽  
K.M. Krishnan ◽  
D.B. Bogy
Keyword(s):  
Electrical Resistivity ◽  
Chemical Structure ◽  
Diamond Like Carbon ◽  
Chemical Structures ◽  
Sputtering Power ◽  
Data Aquisition ◽  
Equilibrium Phases ◽  
Electron Energy Loss ◽  
Power Densities ◽  
Preparation Techniques

Diamond-like carbon (DLC) films have attracted much attention due to their useful properties and applications. These properties are quite variable depending on film preparation techniques and conditions, DLC is a metastable state formed from highly non-equilibrium phases during the condensation of ionized particles. The nature of the films is therefore strongly dependent on their particular chemical structures. In this study, electron energy loss spectroscopy (EELS) was used to investigate how the chemical bonding configurations of DLC films vary as a function of sputtering power densities. The electrical resistivity of the films was determined, and related to their chemical structure.DLC films with a thickness of about 300Å were prepared at 0.1, 1.1, 2.1, and 10.0 watts/cm2, respectively, on NaCl substrates by d.c. magnetron sputtering. EEL spectra were obtained from diamond, graphite, and the films using a JEOL 200 CX electron microscope operating at 200 kV. A Gatan parallel EEL spectrometer and a Kevex data aquisition system were used to analyze the energy distribution of transmitted electrons. The electrical resistivity of the films was measured by the four point probe method.

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