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Anhydrous

About: Anhydrous is a(n) research topic. Over the lifetime, 17632 publication(s) have been published within this topic receiving 163495 citation(s).

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Journal ArticleDOI
TL;DR: A simple, fast, and inexpensive method for the determination of pesticide residues in fruits and vegetables is introduced and effectively removes many polar matrix components, such as organic acids, certain polar pigments, and sugars, to some extent from the food extracts.

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Abstract: A simple, fast, and inexpensive method for the determination of pesticide residues in fruits and vegetables is introduced. The procedure involves initial single-phase extraction of 10 g sample with 10 mL acetonitrile, followed by liquid-liquid partitioning formed by addition of 4 g anhydrous MgSO4 plus 1 g NaCl. Removal of residual water and cleanup are performed simultaneously by using a rapid procedure called dispersive solid-phase extraction (dispersive-SPE), in which 150 mg anhydrous MgSO4 and 25 mg primary secondary amine (PSA) sorbent are simply mixed with 1 mL acetonitrile extract. The dispersive-SPE with PSA effectively removes many polar matrix components, such as organic acids, certain polar pigments, and sugars, to some extent from the food extracts. Gas chromatography/mass spectrometry (GC/MS) is then used for quantitative and confirmatory analysis of GC-amenable pesticides. Recoveries between 85 and 101% (mostly > 95%) and repeatabilities typically < 5% have been achieved for a wide range of fortified pesticides, including very polar and basic compounds such as methamidophos, acephate, omethoate, imazalil, and thiabendazole. Using this method, a single chemist can prepare a batch of 6 previously chopped samples in < 30 min with approximately 1 dollar (U.S.) of materials per sample.

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3,767 citations


Journal ArticleDOI
T. J. Kealy1, P. L. Pauson1Institutions (1)
01 Dec 1951-Nature
Abstract: NUMEROUS investigators have studied the reaction of Grignard reagents with anhydrous ferric chloride, but have failed to isolate any organo-iron compounds or to produce any definite evidence for their formation in such reactions.

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1,288 citations


Journal ArticleDOI
Alexander M. Klibanov1Institutions (1)
TL;DR: Not only do enzymes work vigorously in anhydrous organic media, but in this unnatural milieu they acquire remarkable properties such as greatly enhanced stability, radically altered substrate and enantiomeric specificities, molecular memory, and the ability to catalyse unusual reactions.

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Abstract: Not only do enzymes work vigorously in anhydrous organic media, but in this unnatural milieu they acquire remarkable properties such as greatly enhanced stability, radically altered substrate and enantiomeric specificities, molecular memory, and the ability to catalyse unusual reactions.

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728 citations


Journal ArticleDOI
06 Sep 2009-Nature Materials
TL;DR: This work suggests that the combination of guest molecules and a variety of microporous frameworks would afford highly mobile proton carriers in solids and gives an idea for designing a new type of proton conductor, particularly for high-temperature and anhydrous conditions.

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Abstract: The development of anhydrous proton-conductive materials operating at temperatures above 80 degrees C is a challenge that needs to be met for practical applications. Herein, we propose the new idea of encapsulation of a proton-carrier molecule--imidazole in this work--in aluminium porous coordination polymers for the creation of a hybridized proton conductor under anhydrous conditions. Tuning of the host-guest interaction can generate a good proton-conducting path at temperatures above 100 degrees C. The dynamics of the adsorbed imidazole strongly affect the conductivity determined by (2)H solid-state NMR. Isotope measurements of conductivity using imidazole-d4 showed that the proton-hopping mechanism was dominant for the conducting path. This work suggests that the combination of guest molecules and a variety of microporous frameworks would afford highly mobile proton carriers in solids and gives an idea for designing a new type of proton conductor, particularly for high-temperature and anhydrous conditions.

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605 citations


Journal ArticleDOI
M.D. Taylor1, C.P. Carter1Institutions (1)
Abstract: A general method is described which can be used to synthesize nearly all the lanthanide halides in high purity and good yield. It involves heating in vacuo, a molecularly dispersed mixture of hydrated lanthanide halide with the proper ammonium halide until the water and ammonium halide are expelled to leave pure, anhydrous lanthanide halide. All tri-halides except the iodides of samarium and europium are obtained. These are obtained as di-halides. Optimum condition for synthesis are discussed. The procedure is the only one which has been reported for preparing pure anhydrous iodides with relatively simple apparatus and technique.

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512 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20226
2021142
2020314
2019533
2018734
2017665

Top Attributes

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Topic's top 5 most impactful authors

Robert Glaum

18 papers, 7 citations

Toshio Miyake

11 papers, 126 citations

Ayhan Bozkurt

10 papers, 218 citations

Alexander M. Klibanov

9 papers, 1.4K citations

W. Brzyska

9 papers, 54 citations