Effect of Triton X-100 additive on the synthesis of Beta zeolites and their catalytic application in acylation of anisole with acetic anhydride

2021 ◽  
pp. 125618
Author(s):  
Songsong Miao ◽  
Yue Liu ◽  
Hao Zhang ◽  
Xinyu Chang ◽  
He Sun ◽  
...  
Keyword(s):  
Acetic Anhydride ◽  
Catalytic Application ◽  
Beta Zeolites ◽  
Triton X

scholarly journals High-silica nanocrystalline Beta zeolites: efficient synthesis and catalytic application

2016 ◽  
Vol 7 (1) ◽  
pp. 102-108 ◽  
Author(s):  
Raquel Martínez-Franco ◽  
Cecilia Paris ◽  
Marta E. Martínez-Armero ◽  
Cristina Martínez ◽  
Manuel Moliner ◽  
...  
Keyword(s):  
Efficient Synthesis ◽  
High Solid ◽  
Catalytic Application ◽  
Beta Zeolites ◽  
High Silica ◽  
Synthesis Methodology ◽  
20 Nm

An efficient synthesis methodology to obtain homogeneous nanosized high-silica Beta zeolites (∼10–20 nm) with high solid yields (above 95%) using simple alkyl-substituted flexible dicationic OSDAs is described.

Synthesis of high-Si hierarchical beta zeolites without mesoporogen and their catalytic application in the methanol to propene reaction

2018 ◽  
Vol 8 (11) ◽  
pp. 2966-2974 ◽  
Author(s):  
Xuebin Zhao ◽  
Linying Wang ◽  
Peng Guo ◽  
Nana Yan ◽  
Tantan Sun ◽  
...  
Keyword(s):  
Single Crystalline ◽  
Catalytic Application ◽  
Beta Zeolites ◽  
First Time ◽  
Hierarchical Beta

High-Si single-crystalline beta zeolites with intracrystal mesopores were synthesized for the first time and investigated as catalysts for the methanol to propene (MTP) reaction.

Friedel–Crafts acylation of anisole and toluene with acetic anhydride over nano-sized Beta zeolites

2007 ◽  
Vol 117 (3-4) ◽  
pp. 171-176 ◽  
Author(s):  
Xiangfei Ji ◽  
Zhangfeng Qin ◽  
Mei Dong ◽  
Guofu Wang ◽  
Tao Dou ◽  
...  
Keyword(s):  
Acetic Anhydride ◽  
Beta Zeolites

Triton X-100 stabilized Pd nanoparticles and their catalytic application in one-pot sequential Heck and Hiyama coupling in water

2017 ◽  
Vol 44 (1) ◽  
pp. 265-275 ◽  
Author(s):  
D. S. Gaikwad ◽  
K. A. Undale ◽  
D. B. Patil ◽  
D. M. Pore ◽  
A. A. Kamble
Keyword(s):  
Pd Nanoparticles ◽  
One Pot ◽  
Catalytic Application ◽  
Triton X

Enhanced Activity of Nanocrystalline Beta Zeolite for Acylation of Veratrole with Acetic Anhydride

2016 ◽  
Vol 16 (4) ◽  
pp. 4247-4251
Author(s):  
Aisha Mahmood Abdulkareem Al-Turkustani ◽  
Rosilda Selvin
Keyword(s):  
Acetic Anhydride ◽  
Zeolite Catalyst ◽  
Structural Features ◽  
Systematic Investigation ◽  
Beta Zeolite ◽  
Particle Sizes ◽  
Solid Catalysts ◽  
Beta Zeolites ◽  
Homogeneous Acid ◽  
Heterogeneous Solid

Friedel-Craft acylation of veratrole using homogeneous acid catalysts such as AlCl3, FeCl3, ZnCl2, and HF etc. produces acetoveratrone, (3’,4’-dimethoxyacetophenone), which is the intermediate for synthesis of papavarine alkaloids. The problems associated with these homogeneous catalysts can be overcome by using heterogeneous solid catalysts. Since acetoveratrone is a larger molecule, large pore Beta zeolites with smaller particle sizes are beneficial for the liquid-phase acylation of veratrole, for easy diffusion of reactants and products. The present study aims in the acylation of veratrole with acetic anhydride using nanocrystalline Beta Zeolite catalyst. A systematic investigation of the effects of various reaction parameters was done. The catalysts were characterized for their structural features by using XRD, TEM and DLS analyses. The catalytic activity of nanocrystalline Beta zeolite was compared with commercial Beta zeolite for the acylation and was found that nanocrystalline Beta zeolite possessed superior activity.

SEM of non-coated hepatocellular cytoskeleton of perfused livers

1984 ◽  
Vol 42 ◽  
pp. 306-307
Author(s):  
S.W. French ◽  
N.C. Benson ◽  
C. Davis-Scibienski
Keyword(s):  
Ambient Temperature ◽  
Critical Point ◽  
Protease Inhibitors ◽  
Metal Deposition ◽  
Heat Damage ◽  
Detergent Extraction ◽  
Cytoskeletal Elements ◽  
Triton X ◽  
Excised Tissue

Previous SEM studies of liver cytoskeletal elements have encountered technical difficulties such as variable metal coating and heat damage which occurs during metal deposition. The majority of studies involving evaluation of the cell cytoskeleton have been limited to cells which could be isolated, maintained in culture as a monolayer and thus easily extracted. Detergent extraction of excised tissue by immersion has often been unsatisfactory beyond the depth of several cells. These disadvantages have been avoided in the present study. Whole C3H mouse livers were perfused in situ with 0.5% Triton X-100 in a modified Jahn's buffer including protease inhibitors. Perfusion was continued for 1 to 2 hours at ambient temperature. The liver was then perfused with a 2% buffered gluteraldehyde solution. Liver samples including spontaneous tumors were then maintained in buffered gluteraldehyde for 2 hours. Samples were processed for SEM and TEM using the modified thicarbohydrazide procedure of Malich and Wilson, cryofractured, and critical point dried (CPD). Some samples were mechanically fractured after CPD.

Immunoelectrophoretic Analysis of Membrane Glycoproteins in Cultured Human Endothelial Cells

1990 ◽  
Vol 63 (02) ◽  
pp. 303-311
Author(s):  
Tone Børsum
Keyword(s):  
Endothelial Cells ◽  
Endothelial Cell ◽  
Rabbit Antiserum ◽  
Platelet Glycoprotein ◽  
Membrane Glycoproteins ◽  
Human Endothelial Cells ◽  
Immunoelectrophoretic Analysis ◽  
Glycoprotein Complex ◽  
Crossed Immunoelectrophoresis ◽  
Triton X

SummaryHuman endothelial cells isolated from umbilical cordswere solubilized in Triton X-100 and examined by crossedimmunoelec-trophoresis using rabbit antiserum against endothelial cells. Endogenous labelling of the endothelialcell proteins with 14Cmannose followed by crossed immunoelectrophoresis and autoradiography revealed about 10 immunoprecipitates. Four of these endothelial cell glycoproteins were labelled by lactoperoxidase catalyzed iodination and thus were surface located. Three of the surface located glycoproteins showed reduced electrophoretic mobility after incubation of the endothelial cells with neuraminidase and were therefore sialoglycoproteins. Amphiphilicity of endothelial cell glycoproteins was studied by crossed hydrophobic interaction immunoelectrophoresis with phenyl-Sepharose in the intermediate gel. Amphiphilic proteins also show increasing electrophoretic migration velocity with decreasing concentration of Triton X-100 in the first dimension gels. Five of the endothelial cell glycoproteins were shown to be amphiphilic using these two techniques.Two monoclonal antibodies against the platelet glycoprotein complex Ilb-IIIa and glycoprotein IlIa, respectively, reacted with the same precipitate of endothelial cells. When a polyclonal antibody against the platelet glycoprotein complex Ilb-IIIa was incorporated into the intermediate gel the position of two endothelial cell precipitates were lowered. One of these was a sialoglycoprotein.

The Uptake of Adenine by Isolated Human Platelet Membranes

1974 ◽  
Vol 32 (02/03) ◽  
pp. 457-464
Author(s):  
Paul C. French ◽  
Jan J. Sixma ◽  
Holm Holmsen
Keyword(s):  
Human Platelet ◽  
Facilitated Diffusion ◽  
Adenine Phosphoribosyltransferase ◽  
Ph Optimum ◽  
Intact Cells ◽  
Platelet Membranes ◽  
Group Translocation ◽  
Triton X

SummaryAdenine uptake into isolated platelet membranes had about the same Km (151 ± 21 • 9 nM) as uptake into intact cells (159 ± 21 nM) and was also competitively inhibited by papaverine and hypoxanthine. No uptake occurred at 0° and accumulated adenine was converted to AMP. AMP was not firmly bound to protein as judged by chromatography of triton X-100 solubilized membranes on Sephadex G25. The pH optimum for adenine uptake was at pH 5-5. Exogenous 5-phosphoribosyl-l-pyrophos- phate strongly stimulated uptake. These data may be explained by uptake of adenine by facilitated diffusion followed by conversion to AMP by adenine phosphoribosyltransferase but group translocation cannot be entirely excluded.

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