scholarly journals Adsorption of Sodium Cholate on Cationic Dextran Gels: Comparison of Isotherm Binding Models

2021 ◽  
Vol 57 (4) ◽  
pp. 181-192
Author(s):  
Magdalena Cristina Stanciu ◽  
Marieta Nichifor ◽  
Prisacaru Anca-Irina
Keyword(s):  
Bile Acid ◽  
Entire Range ◽  
Sodium Cholate ◽  
Equilibrium Analysis ◽  
Acid Salt ◽  
Nacl Solution ◽  
Experimental Adsorption ◽  
Binding Models ◽  
Adsorption Data ◽  
Dimethylammonium Chloride

Cationic dextran hydrogels having pendent 51-59 mol% N-alkyl-N,N-dimethylammonium chloride groups were synthesized and tested as adsorbents for sodium cholate. The bile acid salt sorption by these gels was evaluated by equilibrium analysis in water and 10 mM NaCl solution. The best adsorption results were obtained with amphiphilic dextran-based gels having two types of pendant ammonium chloride groups with different polarities. Experimental adsorption data for all polymers fitted good with Langmuir, Dubinin-Raduskevich and Temkin models over the entire range of ligand concentrations. The maximum experimental adsorption capacity of dextran sorbents for sodium cholate was in the range 850-1075 mg/g.

scholarly journals A high-throughput LC-MS/MS method for the measurement of the bile acid/salt content in microbiome-derived sample sets

MethodsX ◽  
2020 ◽  
Vol 7 ◽  
pp. 100951 ◽  
Author(s):  
Thomas D. Horvath ◽  
Sigmund J. Haidacher ◽  
Kathleen M. Hoch ◽  
Jennifer M. Auchtung ◽  
Anthony M. Haag
Keyword(s):  
Bile Acid ◽  
High Throughput ◽  
Salt Content ◽  
Acid Salt

Adsorption of chromium (VI) from aqueous solutions on activated carbon

1994 ◽  
Vol 30 (9) ◽  
pp. 191-197 ◽  
Author(s):  
R. Leyva Ramos ◽  
A. Juarez Martinez ◽  
R. M. Guerrero Coronado
Keyword(s):  
Activated Carbon ◽  
Adsorption Isotherm ◽  
Adsorption Capacity ◽  
Ph Effect ◽  
Freundlich Isotherm ◽  
Maximum Adsorption Capacity ◽  
Experimental Adsorption ◽  
Ph Values ◽  
Chromium Vi ◽  
Adsorption Data

The adsorption isotherm of chromium (VI) on activated carbon was obtained in a batch adsorber. The experimental adsorption data were fitted reasonably well to the Freundlich isotherm. The effect of pH on the adsorption isotherm was investigated at pH values of 4, 6, 7, 8, 10 and 12. It was found that at pH < 6, Cr(VI) was adsorbed and reduced to Cr(III) by the catalytic action of the carbon and that at pH ≥ 12, Cr(VI) was not adsorbed on activated carbon. Maximum adsorption capacity was observed at pH 6 and the adsorption capacity was diminished about 17 times by increasing the pH from 6 to 10. The pH effect was attributed to the different complexes that Cr(VI) can form in aqueous solution. The adsorption isotherm was also affected by the temperature since the adsorption capacity was increased by raising the temperature from 25 to 40°C. It was concluded that Cr(VI) was adsorbed significantly on activated carbon at pH 6 and that the adsorption capacity was greatly dependent upon pH.

Lithocholyltaurine interacts with cholinergic receptors on dispersed chief cells from guinea pig stomach

1998 ◽  
Vol 274 (6) ◽  
pp. G997-G1004 ◽  
Author(s):  
Jean-Pierre Raufman ◽  
Piotr Zimniak ◽  
Anita Bartoszko-Malik
Keyword(s):  
Bile Acid ◽  
Bile Acids ◽  
Tissue Injury ◽  
Partial Agonist ◽  
Sodium Cholate ◽  
Cholinergic Receptors ◽  
Homogeneous Population ◽  
Chief Cells ◽  
Threefold Increase ◽  
Pepsinogen Secretion

Although bile acids damage gastric mucosa, the mechanisms underlying tissue injury induced by these agents are not well understood. To determine whether bile acids alter gastric secretory function, we investigated the actions of sodium cholate, deoxycholate, lithocholate, and their taurine and glycine conjugates on a highly homogeneous population of gastric chief cells. Lithocholyltaurine (LCT), a particularly injurious bile acid, caused a threefold increase in pepsinogen secretion (detectable with 100 nM and maximal with 10 μM LCT). When combined with other secretagogues, increasing concentrations of LCT caused progressive inhibition of carbamylcholine (carbachol)-induced pepsinogen secretion but did not alter CCK- or 8-bromo-cAMP-induced secretion. Taurine and unconjugated lithocholate did not alter basal or carbachol-induced secretion. These observations suggested that LCT is a partial cholinergic agonist. To test this hypothesis, we examined the actions of the cholinergic antagonist atropine on LCT-induced pepsinogen secretion. Atropine (10 μM) abolished carbachol- and LCT-induced pepsinogen secretion. Likewise, carbachol (0.1 mM) and LCT (1 mM) induced an atropine-sensitive, two- to threefold increase in cellular levels of inositol 1,4,5-trisphosphate. We examined the actions of LCT on binding of the cholinergic radioligand [ N-methyl-3H]scopolamine ([3H]NMS) to chief cells. Half-maximal inhibition of [3H]NMS binding was observed with ∼0.5 mM carbachol and 1 mM LCT. These results indicate that the bile acid LCT is a partial agonist for muscarinic cholinergic receptors on gastric chief cells.

MD simulations of hydrogen diffusion in ZIF-11 with a force field fitted to experimental adsorption data

2015 ◽  
Vol 203 ◽  
pp. 132-138 ◽  
Author(s):  
P. Schierz ◽  
S. Fritzsche ◽  
W. Janke ◽  
S. Hannongbua ◽  
O. Saengsawang ◽  
...  
Keyword(s):  
Force Field ◽  
Hydrogen Diffusion ◽  
Md Simulations ◽  
Experimental Adsorption ◽  
Adsorption Data

scholarly journals Nonlinear regression for analysis of the uptake of KMnO4 from aqueous solutions onto natural marl

2021 ◽  
Vol 1204 (1) ◽  
pp. 012003
Author(s):  
E A Bouzeghaia ◽  
S Hafsi ◽  
N Gherraf
Keyword(s):  
Aqueous Solution ◽  
Adsorption Process ◽  
Low Ph ◽  
Suitable Model ◽  
Surface Functional Groups ◽  
Experimental Adsorption ◽  
Adsorption Capacities ◽  
Adsorption Data ◽  
Batch Technique ◽  
Formation Of Complexes

Abstract The present work aims to evaluate the performance of raw marl collected from the region of Oum El Bouaghi on the elimination of KMnO4 from aqueous solution. The adsorption capacities were studied using the batch technique as a function of pH, initial concentration and temperature. The maximum adsorption for KMnO4 was found to be 83.517% at pH 3.0. When the pH is low (pH<3.0), the uptake of KMnO4 occurs with an electrostatic attraction between the MnO4-ions and the surface proton groups, while at pH ≥3.0-8.0, the formation of complexes with the surface functional groups during the adsorption process and/or cation exchange are responsible for retention of Mn(II) ions onto marl. Experimental adsorption data were modeled with different nonlinear isotherms and kinetic models. Furthermore, statistical errors (SSE, SD, ARE, χ 2, R2 and R2 adj) were calculated to choose the suitable model. Langmuir isotherm was found to be best for fitting the experimental data. The calculated thermodynamic parameters indicated that adsorption process was physical, spontaneous and endothermic in nature. From this work, it was concluded that the natural marl can be used for effective elimination of KMnO4 from aqueous solution and wastewater.

Interrelationship of Plasma Cholate and Phospholipid Concentrations and Their Resultant Effect on Plasma Cholesterol in Biliary Obstruction

1957 ◽  
Vol 188 (2) ◽  
pp. 337-341 ◽  
Author(s):  
Meyer Friedman ◽  
Sanford Byers
Keyword(s):  
Bile Acid ◽  
Intravenous Injection ◽  
Biliary Obstruction ◽  
Plasma Cholesterol ◽  
Plasma Phospholipid ◽  
Sodium Cholate ◽  
Phospholipid Ratio ◽  
Resultant Effect ◽  
Normal Rat

Elevation of plasma cholate (by intravenous injection of sodium cholate) in both the normal rat and the rat with biliary obstruction was found to lead to an elevation of plasma phospholipid and cholesterol. Experimental elevation of plasma phospholipid (also by injection), however, while leading to an elevation of plasma cholesterol did not elevate the plasma cholate in either the normal or obstructed rat. Furthermore, comparison of the cholesterol-phospholipid ratio obtained in rats by infusion of phosphatide with those observed in rats with biliary obstruction suggests that the plasma phospholipid elevation occurring spontaneously in these latter rats induced the hypercholesteremia observed. In view of these observations, it is suggested the elevation of plasma bile acid occurring in biliary obstruction effects its hypercholesteremic effect by first leading to the elevation of plasma phospholipid. The latter in turn leads to the hypercholesteremia observed.

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