Direct aqueous synthesis of cyanomethyl thioglycosides from reducing sugars; ready access to reagents for protein glycosylation

2016 ◽  
Vol 14 (28) ◽  
pp. 6679-6682 ◽  
Author(s):  
Stewart R. Alexander ◽  
Antony J. Fairbanks
Keyword(s):  
Aqueous Solution ◽  
Reducing Sugars ◽  
Protein Glycosylation ◽  
Aqueous Synthesis ◽  
Ready Access

Unprotected carbohydrates can be directly converted into cyanooethyl thioglycosides, which in turn may be used for protein glycosylation, in a completely stereoselective manner by reaction with 2-chloro-1,3-dimethylimidazolinium chloride (DMC) and mercaptoacetonitrile in aqueous solution.

scholarly journals Nopalea cochenillifera Biomass as Bioadsorbent in Water Purification

Water ◽  
2021 ◽  
Vol 13 (15) ◽  
pp. 2012
Author(s):  
Vitória Régia do Nascimento Lima ◽  
Álvaro Gustavo Ferreira da Silva ◽  
Renata Ranielly Pedroza Cruz ◽  
Luana da Silva Barbosa ◽  
Neilier Rodrigues da Silva Junior ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Water Purification ◽  
Reducing Sugars ◽  
Northeastern Brazil ◽  
Human Consumption ◽  
Contaminated Water ◽  
Water Safety ◽  
Total Coliforms ◽  
Exchange Matrix ◽  
Nopalea Cochenillifera

Contaminated water consumption is one of the greatest risks to human health, especially in underdeveloped and developing countries. Water is a universal right, but millions of people worldwide consume untreated surface water. The objective in this study is to evaluate water purification with Nopalea cochenillifera var. Miúda biomass. Fragments (1, 2, and 3 g) of N. cochenillifera were added to the aqueous solution containing red-yellow Chromic and Podzolic Luvisol simulating turbid water sources in Northeastern Brazil. The total, non-structural (i.e., reducing and non-reducing sugars, alcohol insoluble solids), and structural (i.e., pectin) carbohydrates, adsorption kinetics, turbidity, electrical conductivity, pH, zeta potential, and total coliforms presence were evaluated. Findings show that the Nopalea cochenillifera biomass adsorbed the suspended particles in the aqueous solution, making it more translucent due to the complex and heterogeneous adsorbents’ ion exchange matrix, but the biomass addition did not eliminate total coliforms from the aqueous solution. We concluded that the Nopalea cochenillifera biomass water treatment reduces suspended dissolved particles and turbidity, but it needs to be associated with other treatments to eliminate total coliforms and ensure water safety for human consumption.

Ultra-facile aqueous synthesis of nanoporous zeolitic imidazolate framework membranes for hydrogen purification and olefin/paraffin separation

2019 ◽  
Vol 7 (18) ◽  
pp. 10898-10904 ◽  
Author(s):  
Xu Jiang ◽  
Songwei Li ◽  
Yongping Bai ◽  
Lu Shao
Keyword(s):  
Aqueous Solution ◽  
Gas Separation ◽  
Molecular Sieve ◽  
Room Temperature ◽  
Hydrogen Purification ◽  
Step Method ◽  
Zeolitic Imidazolate Framework ◽  
Aqueous Synthesis ◽  
One Step

An ultra-facile one-step method is discovered to synthesize defect-free ZIF-8 molecular sieve membranes in aqueous solution at room temperature for exceptional gas separation.

Microwave-assisted aqueous synthesis of Mn-doped ZnS quantum dots and their room-temperature phosphorescence detection of indapamide

2014 ◽  
Vol 6 (18) ◽  
pp. 7489-7495 ◽  
Author(s):  
Dong Zhu ◽  
Wei Li ◽  
Hong-Mei Wen ◽  
Qian Chen ◽  
Li Ma ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Quantum Dots ◽  
Room Temperature ◽  
Synthetic Approach ◽  
Room Temperature Phosphorescence ◽  
High Quality ◽  
Aqueous Synthesis ◽  
Microwave Assisted ◽  
Mn Doped

High-quality Mn-doped ZnS QDs were prepared using a green and rapid microwave-assisted synthetic approach in an aqueous solution, which were used for room-temperature phosphorescence (RTP) detection of indapamide.

scholarly journals The kinetics of mutarotation in solution

1940 ◽  
Vol 176 (966) ◽  
pp. 352-367 ◽  
Keyword(s):  
Aqueous Solution ◽  
Room Temperature ◽  
Reducing Sugars ◽  
Arrhenius Equation ◽  
Energy Of Activation ◽  
A Value ◽  
Temperature Ranges ◽  
Velocity Coefficient ◽  
Kinetics Of ◽  
True Energy

The kinetics of the mutarotation of representative reducing sugars from the pentose, hexose and disaccharide series have been investigated polarimetrically over wide temperature ranges in aqueous solution. The dependence of the velocity coefficient, k , upon temperature is fairly well reproduced by an equation of the form ln k = C + ( J/R ) ln T - E/RT . The true energy of activation, E , is found to be some 6000 calories greater than the apparent value afforded by the Arrhenius equation at room temperature. J/R has a value of — 10, which is identified as the number of oscillators contributing to the activation. The constants C, J and E of this equation are discussed, with reference to many reactions, in terms of a theory of unimolecular reactions in solution.

The Percent Un-Ionized Ammonia in Aqueous Ammonia Solutions at Different pH Levels and Temperatures

1972 ◽  
Vol 29 (10) ◽  
pp. 1505-1507 ◽  
Author(s):  
R. P. Trussell
Keyword(s):  
Aqueous Solution ◽  
Aqueous Ammonia ◽  
Ammonia Molecule ◽  
Ammonium Ion ◽  
Ready Access ◽  
Freshwater Environments

Previous studies have shown that the un-ionized ammonia molecule and not the ammonium ion is the form of the toxicant harmful to fish. Prior attempts to quantify the amount of un-ionized ammonia in an aqueous solution have been confusing. Data given here provide ready access to the amount of un-ionized ammonia over a range of temperature and pH that is common in temperate freshwater environments.

Fine tunable aqueous solution synthesis of textured flexible SnS2 thin films and nanosheets

2015 ◽  
Vol 17 (14) ◽  
pp. 9282-9287 ◽  
Author(s):  
Peter Nørby ◽  
Simon Johnsen ◽  
Bo Brummerstedt Iversen
Keyword(s):  
Thin Films ◽  
Aqueous Solution ◽  
Synthesis Method ◽  
Environmentally Benign ◽  
Flexible Substrates ◽  
Solution Synthesis ◽  
Aqueous Synthesis

We present an environmentally benign aqueous synthesis method to obtain fine tunable layered SnS2 thin films as well as methods to obtain freestanding nanosheets or transfer to flexible substrates.

An aqueous synthesis of porous PtPd nanoparticles with reversed bimetallic structures for highly efficient hydrogen generation from ammonia borane hydrolysis

Nanoscale ◽  
2020 ◽  
Vol 12 (2) ◽  
pp. 638-647 ◽  
Author(s):  
Kaisheng Yao ◽  
Chenchen Zhao ◽  
Nan Wang ◽  
Tianji Li ◽  
Weiwei Lu ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Hydrogen Generation ◽  
Ammonia Borane ◽  
One Pot ◽  
Aqueous Synthesis ◽  
Catalytic Activities ◽  
Highly Efficient ◽  
Bimetallic Structures

Porous PtPd NPs with reversed bimetallic structures from Pd-on-Pt to Pt-on-Pd can be one-pot prepared in aqueous solution under the modulation of [C16mim]Cl and glycine and show superior catalytic activities for AB hydrolysis to produce hydrogen.

Aqueous Synthesis of Highly Luminescent CdTe/CdS/ZnS Core-Shell-Shell Quantum Dots with Biocompatibility

2011 ◽  
Vol 287-290 ◽  
pp. 348-351
Author(s):  
Huai Qing Huang ◽  
Jin Ling Liu ◽  
Bao Fu Han ◽  
Shu Kun Xu
Keyword(s):  
Aqueous Solution ◽  
Quantum Dots ◽  
Cell Imaging ◽  
The Other ◽  
Core Shell ◽  
Aqueous Synthesis ◽  
Fluorescent Intensity ◽  
Synthesis Time ◽  
Cds Qds ◽  
Hydrothermal Methods

CdTe/CdS/ZnS core-shell-shell (CSS) quantum dots (QDs) were synthesized in aqueous solution via water-bathing combined hydrothermal method using L-cysteine (L-Cys) as a stabilizer. This method possesses both the advantages of water-bathing and hydrothermal methods, and thus can prepare CSS QDs with markedly reduced synthesis time than previously reported methods. The as-prepared QDs display a higher fluorescent intensity than bare CdTe or CdTe/CdS. After co-cultured with yeast at different growth phase, the as-prepared L-Cys capped CdTe/CdS/ZnS QDs showed much less toxicity than the other CdTe or CdTe/CdS QDs. Our results demonstrate that the CSS QD would have a promising potential in fields of bio-labeling and cell imaging.

scholarly journals The photosynthesis of naturally occurring compounds. I.—The action of ultra-violet light on carbonic acid

1927 ◽  
Vol 116 (773) ◽  
pp. 197-211 ◽  
Keyword(s):  
Aqueous Solution ◽  
Aqueous Solutions ◽  
Reducing Sugars ◽  
Carbonic Acid ◽  
Ultra Violet ◽  
Ultra Violet Light ◽  
Violet Light ◽  
Naturally Occurring ◽  
Two Stages

In a preliminary paper one of us, in conjunction with Prof. Heilbron and Prof. Barker, described some observations on the action of ultra-violet light on pure aqueous solutions of carbonic acid. It was found that traces of formaldehyde were present in these solutions after insolation, provided that a stream of the gas were passed through the water during the exposure to the light. These results differed from those which had previously been recorded by Moore and Webster, who had stated that the presence of a catalyst such as colloidal ferric or uranium hydroxide was necessary. The observation by Moore and Webster that formaldehyde in aqueous solution is converted by ultra-violet light into reducing sugars was fully confirmed, and the view was put forward that the mechanism of the photosynthesis of carbohydrates from carbonic acid consisted of two stages, first, the formation of formaldehyde, and, second, the conversion of this substance into hexoses.

Scope of the DMC mediated glycosylation of unprotected sugars with phenols in aqueous solution

2020 ◽  
Vol 18 (37) ◽  
pp. 7355-7365 ◽  
Author(s):  
Xin Qiu ◽  
Antony J. Fairbanks
Keyword(s):  
Aqueous Solution ◽  
Reducing Sugars ◽  
Protecting Groups ◽  
Aryl Glycosides

Activation of reducing sugars in aqueous solution using DMC and triethylamine in the presence of phenols allows direct stereoselective conversion to the corresponding 1,2-trans aryl glycosides without the need for any protecting groups.

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