scholarly journals Type II porous ionic liquid based on metal-organic cage that enables L-tryptophan identification

2021 ◽  
Author(s):  
Zhuxiu Zhang ◽  
Baolin Yang ◽  
Bingjie Zhang ◽  
Mifen Cui ◽  
Jihai Tang ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Room Temperature ◽  
Aromatic Amino Acids ◽  
Chemical Separation ◽  
Amino Acid Uptake ◽  
Acid Uptake ◽  
Type Ii ◽  
Dynamic Simulations ◽  
Coordination Cages ◽  
Metal Organic

Abstract Porous liquids with chemical separation properties are quite well-studied in general, but there is only a handful of reports in the context of identification and separation of non-gaseous molecules. Herein, we report the first example of Type-II porous ionic liquid that exhibits exceptional selectivity towards L-tryptophan (L-Trp) over other aromatic amino acids and the first in which coordination cages promote this selectivity. A previously known class of anionic organic-inorganic hybrid doughnut-like cage (HD) has been readily dissolved in trihexyltetradecylphosphonium chloride (THTP_Cl). The resulting liquid, HD/THTP_Cl, is thereby composed of common components, facile to prepare, and exhibit room temperature fluidity. The permanent porosity are manifested by the high-pressure isotherm for CH4 and modeling studies. With evidence from time-dependent amino acid uptake, competitive extraction studies and molecular dynamic simulations, HD/THTP_Cl exhibit better selectivity towards L-Trp than existing solid state sorbents, and we attribute it to not only the intrinsic porosity of HD but also the host-guest interactions between HD and L-Trp. Specifically, each HD unit is binded with nearly 5 L-Trp molecules, which is higher than the L-Trp occupation in the structure unit of other benchmark metal-organic frameworks.

Gas promotes the crystallization of nano-sized metal–organic frameworks in ionic liquid

2015 ◽  
Vol 51 (57) ◽  
pp. 11445-11448 ◽  
Author(s):  
Chengcheng Liu ◽  
Bingxing Zhang ◽  
Jianling Zhang ◽  
Li Peng ◽  
Xinchen Kang ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Room Temperature ◽  
Metal Organic Framework ◽  
Metal Organic Frameworks ◽  
Metal Organic ◽  
Organic Framework

Gas can promote metal–organic framework (MOF) crystallization and MOF nanoparticles were obtained at room temperature.

scholarly journals Synthesis of Zn-based metal–organic frameworks in ionic liquid microemulsions at room temperature

RSC Advances ◽  
2018 ◽  
Vol 8 (46) ◽  
pp. 26237-26242 ◽  
Author(s):  
Ranfeng Ye ◽  
Min Ni ◽  
Yuanyuan Xu ◽  
Hao Chen ◽  
Shengqing Li
Keyword(s):  
Ionic Liquid ◽  
Room Temperature ◽  
Metal Organic Frameworks ◽  
Aromatic Ligand ◽  
Metal Organic ◽  
Benzenetricarboxylic Acid ◽  
First Time

For the first time, Zn-metal–organic frameworks (Zn-MOFs) were prepared using Zn2+ and the aromatic ligand 1,3,5-benzenetricarboxylic acid (BTC) in ionic liquid microemulsions stabilized by the surfactant TX-100.

Membrane transport of aromatic amino acids by Hymenolepis diminuta (Cestoda)

Parasitology ◽  
1980 ◽  
Vol 81 (2) ◽  
pp. 395-403 ◽  
Author(s):  
P. W. Pappas ◽  
H. R. Gamble
Keyword(s):  
Amino Acids ◽  
Amino Acid ◽  
Amino Acid Transport ◽  
Aromatic Amino Acid ◽  
Aromatic Amino Acids ◽  
Amino Acid Uptake ◽  
Hymenolepis Diminuta ◽  
Acid Uptake ◽  
Acid Transport ◽  
Concentration Difference

SUMMARYAromatic amino acids (phenylalanine, tryptophan and tyrosine) are absorbed by Hymenolepis diminuta through a combination of mediated (non-Na+-sensitive) transport and diffusion. All 3 amino acids are accumulated against an apparent concentration difference during a 30-min incubation of tapeworms in 0·1 mM 3H-labelled amino acid. Inhibitor studies demonstrate that phenylalanine, tryptophan and tyrosine are mutually competitive inhibitors of the uptake of each other, and the uptake of these amino acids is inhibited by aliphatic amino acids but not by basic or dicarboxylic amino acids. The D- and L-isomers of aromatic amino acids are equally effective in inhibiting aromatic amino acid uptake. The data indicate that at least 3 amino acid transport loci are involved in aromatic amino acid transport by H. diminuta.

Sodium-amino acid cotransport by type II alveolar epithelial cells

1985 ◽  
Vol 59 (5) ◽  
pp. 1616-1622 ◽  
Author(s):  
S. E. Brown ◽  
K. J. Kim ◽  
B. E. Goodman ◽  
J. R. Wells ◽  
E. D. Crandall
Keyword(s):  
Amino Acid ◽  
Epithelial Cells ◽  
Alveolar Epithelial Cell ◽  
Amino Acid Uptake ◽  
Alveolar Epithelial Cells ◽  
Hill Coefficient ◽  
Acid Uptake ◽  
Type Ii ◽  
Simple Diffusion ◽  
Alveolar Epithelial

Type II alveolar epithelial cell monolayers have been shown to actively transport sodium (Na+). Coupling to amino acid uptake could be an important mechanism for Na+ entry into these cells. This study demonstrates the presence of such a coupled cotransport mechanism in the plasma membrane of isolated type II cells by use of the nonmetabolizable amino acid analogue alpha-methylaminoisobutyric acid (MeAIB). Transport of MeAIB in 137 mM Na+ is saturable, with the uptake constant (Vmax) equaling 13.9 pmol X mg prot-1 X s-1 and the Michaelis-Menten constant (Km) equaling 0.13 mM. In the presence of Na+, MeAIB is accumulated against a concentration gradient. MeAIB uptake in the absence of Na+ is linear with MeAIB concentration, as expected for simple diffusion. The Hill coefficient for Na+-MeAIB cotransport is 1.11, suggesting a 1:1 stoichiometry. Proline inhibits Na+-MeAIB cotransport, with Ki equaling 0.5 mM. These findings suggest that Na+-amino acid cotransport may be an important pathway for Na+ (and/or amino acid) uptake into type II alveolar epithelial cells.

Investigation of the V4+-Centre in 6H- and 4H-SIC by the Method of Spectral-Hole Burning

1998 ◽  
Vol 512 ◽  
Author(s):  
C. Hecht ◽  
R. Kummer ◽  
A. Winnacker
Keyword(s):  
Electronic Properties ◽  
Room Temperature ◽  
Hole Burning ◽  
Band Offset ◽  
Spectral Hole Burning ◽  
Type Ii ◽  
Thermally Stable ◽  
Spectral Hole

ABSTRACTIn the context of spectral-hole burning experiments in 4H- and 6H-SiC doped with vanadium the energy positions of the V4+/5+ level in both polytypes were determined in order to resolve discrepancies in literature. From these numbers the band offset of 6H/4H-SiC is calculated by using the Langer-Heinrich rule, and found to be of staggered type II. Furthermore the experiments show that thermally stable electronic traps exist in both polytypes at room temperature and considerably above, which may result in longtime transient shifts of electronic properties.

A Series of Metal-Organic Frameworks for Selective CO2 Capture and Catalytic Oxidative Carboxylation of Olefins

2018 ◽  
Author(s):  
Huong T. D. Nguyen ◽  
Y B. N. Tran ◽  
Hung N. Nguyen ◽  
Tranh C. Nguyen ◽  
Felipe Gándara ◽  
...  
Keyword(s):  
Room Temperature ◽  
Gas Adsorption ◽  
New Materials ◽  
One Pot ◽  
Acid Gas ◽  
Naphthalene Diimide ◽  
Styrene Carbonate ◽  
Metal Organic ◽  
Adsorption Of Co ◽  
The One

<p>Three novel lanthanide metal˗organic frameworks (Ln-MOFs), namely MOF-590, -591, and -592 were constructed from a naphthalene diimide tetracarboxylic acid. Gas adsorption measurements of MOF-591 and -592 revealed good adsorption of CO<sub>2</sub> (low pressure, at room temperature) and moderate CO<sub>2</sub> selectivity over N<sub>2</sub> and CH<sub>4</sub>. Accordingly, breakthrough measurements were performed on a representative MOF-592, in which the separation of CO<sub>2</sub> from binary mixture containing N<sub>2</sub> and CO<sub>2</sub> was demonstrated without any loss in performance over three consecutive cycles. Moreover, MOF-590, MOF-591, and MOF-592 exhibited catalytic activity in the one-pot synthesis of styrene carbonate from styrene and CO<sub>2</sub> under mild conditions (1 atm CO<sub>2</sub>, 80 °C, and solvent-free). Among the new materials, MOF-590 revealed a remarkable efficiency with exceptional conversion (96%), selectivity (95%), and yield (91%). </p><br>

Preparation and Characterization of a Novel Room Temperature Dicationic Ionic Liquid and its Application in the Synthesis of Xanthenediones Under Solvent-Free Conditions

2018 ◽  
Vol 21 (8) ◽  
pp. 602-608 ◽  
Author(s):  
Zainab Ehsani-Nasab ◽  
Ali Ezabadi
Keyword(s):  
Ionic Liquid ◽  
Room Temperature ◽  
Reaction Times ◽  
Significant Loss ◽  
Solvent Free ◽  
Acidity Function ◽  
Efficient Catalyst ◽  
Solvent Free Conditions ◽  
Hammett Acidity Function ◽  
Dicationic Ionic Liquid

Aim and Objective: In the present work, 1, 1’-sulfinyldiethylammonium bis (hydrogen sulfate) as a novel room temperature dicationic ionic liquid was synthesized and used as a catalyst for xanthenediones synthesis. Material and Method: The dicationic ionic liquid has been synthesized using ethylamine and thionyl chloride as precursors. Then, by the reaction of [(EtNH2)2SO]Cl2 with H2SO4, [(EtNH2)2SO][HSO4]2 was prepared and after that, it was characterized by FT-IR, 1H NMR, 13C NMR as well as Hammett acidity function. This dicationic ionic liquid was used as a catalyst for the synthesis of xanthenediones via condensation of structurally diverse aldehydes and dimedone under solvent-free conditions. The progress of the reaction was monitored by thin layer chromatography (ethyl acetate/n-hexane = 3/7). Results: An efficient solvent-free method for the synthesis of xanthenediones has been developed in the presence of [(EtNH2)2SO][HSO4]2 as a powerful catalyst with high to excellent yields, and short reaction times. Additionally, recycling studies have demonstrated that the dicationic ionic liquid can be readily recovered and reused at least four times without significant loss of its catalytic activity. Conclusion: This new dicationic ionic liquid can act as a highly efficient catalyst for xanthenediones synthesis under solvent-free conditions.

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