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Journal articles on the topic 'Mechanism; Ionic strength; Chromatography'

Author: Grafiati

Published: 4 June 2021

Last updated: 6 February 2022

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1

Nakov, Natalija, Jelena Acevska, Katerina Brezovska, Rumenka Petkovska, and Aneta Dimitrovska. "Optimization of hydrophilic interaction liquid chromatographic method for simultaneous determination of cetylpyridinium chloride and benzocaine in lozenges." Macedonian Journal of Chemistry and Chemical Engineering 31, no. 1 (2012): 47. http://dx.doi.org/10.20450/mjcce.2012.56.

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A new Hydrophilic Interaction Liquid Chromatography (HILIC) method was developed for simultaneous determination of cetylpyridinium chloride and benzocaine as active substances in lozenges. Method development included investigation of the influence of the critical chromatographic conditions such as: type of organic modifier, mobile phase strength, ionic strength and pH value of the buffer used in the mobile phase, as well as experimental determination of dominant mechanism of retention. The optimal chromatographic conditions were obtained using bare silica column and a mobile phase consisting o

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2

Nakov, Natalija, Rumenka Petkovska, Liljana Ugrinova, Suzana Trajkovic-Jolevska, and Aneta Dimitrovska. "Determination of Rocuronium bromide by hydrophilic interaction liquid chromatography (HILIC)." Macedonian Pharmaceutical Bulletin 57 (2001): 17–24. http://dx.doi.org/10.33320/maced.pharm.bull.2011.57.002.

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A new method involving hydrophilic interaction liquid chromatography (HILIC) has been developed for determination of rocuronium bromide in presents of its main impurities (impurity A and impurity C), which are also its main degradation products, in solution for injection. The influence of the critical chromatographic parameters such as content of acetonitrile in the mobile phase, ionic strength and pH value of the buffer used in the mobile phase were investigated using the Design of experiments approach (DoE). The mechanism of retention of rocuronium bromide on bare silica column was also inve

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3

Peris-García, Ester, Raquel Burgos-Gil, María Celia García-Alvarez-Coque, and María José Ruiz-Angel. "Hydrophilic Liquid Chromatography versus Reversed-Phase Liquid Chromatography in the Absence and the Presence of 1-Hexyl-3-methylimidazolium Chloride for the Analysis of Basic Compounds." Separations 7, no. 2 (2020): 30. http://dx.doi.org/10.3390/separations7020030.

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In reversed-phase liquid chromatography (RPLC), positively charged basic compounds yield broad and asymmetric peaks, as a result of ionic interactions with free silanols that remain on conventional silica-based columns. Diverse solutions have been proposed to mask the silanophilic activity, which is translated to an improved peak shape. In this work, the chromatographic performance of hydrophilic interaction liquid chromatography (HILIC) was evaluated as an alternative to the addition of an ionic liquid (IL) to the aqueous-organic mobile phase used with RPLC columns, for the analysis of eight

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4

Yan, Yan-Ying, Qing-An Zhang, Er-Chun Li, and Ya-Feng Zhang. "Ions in Wine and Their Relation to Electrical Conductivity Under Ultrasound Irradiation." Journal of AOAC INTERNATIONAL 100, no. 5 (2017): 1516–23. http://dx.doi.org/10.5740/jaoacint.17-0024.

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Abstract Change in electrical conductivity is considered apotential indicator for the on-line monitoring of wine aging accelerated by ultrasound, as determined inour previous study; however, the exact mechanism of change is currently unclear. In this study, the ion content and the total ionic strength were analyzed by ion-exchange chromatography to investigate the change mechanism of the electrical conductivity of wineunder ultrasound irradiation. The results indicate that the changes in wine electrical conductivity during ultrasound treatment correlate with the changes in the cations (Na+, K+

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5

Arora, Taruna, Pankaj Patel, and K. Muralidhar. "Assessment of Pseudoaffinity Chromatography Using Textile Dyes for Isolation of Buffalo Pituitary Luteinizing Hormone." ISRN Chromatography 2012 (December 16, 2012): 1–8. http://dx.doi.org/10.5402/2012/639514.

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Extensive investigation has been carried out to elucidate the mechanisms involved in pseudoligand affinity chromatography using textile dyes, and, empirically, it has been attributed to the chemical and steric structures of dye and protein. Possibly, a variety of interactions especially ionic and/or hydrophobic influence with a varying share in the binding and differ from protein to protein and from dye to dye. In this study, we have attempted to understand the effect of various biophysical parameters like the nature of the eluant, pH, and ionic strength on the binding of crude luteinizing hor

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6

do Carmo, João P., Ye Zaw Phyo, Andreia Palmeira, et al. "Enantioseparation, recognition mechanisms and binding of xanthones on human serum albumin by liquid chromatography." Bioanalysis 11, no. 13 (2019): 1255–74. http://dx.doi.org/10.4155/bio-2019-0074.

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Aim: To develop a method for enantioseparation of several chiral derivatives of xanthones (CDXs) by LC using a human serum albumin-chiral stationary phase (HSA-CSP) and screening CDX-HSA affinity. Additionally, recognition mechanisms were investigated. Materials & methods: The influence of organic modifier, buffer type, pH and ionic strength of mobile phase, and temperature were explored. The affinity was determined by measuring the retention times and further calculation of bound percentage. Chiral recognition mechanisms were investigated by docking. Results: Enantioselectivity and resolu

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FORGET, Marie-Annick, Richard R. DESROSIERS, Denis GINGRAS, and Richard BÉLIVEAU. "Phosphorylation states of Cdc42 and RhoA regulate their interactions with Rho GDP dissociation inhibitor and their extraction from biological membranes." Biochemical Journal 361, no. 2 (2002): 243–54. http://dx.doi.org/10.1042/bj3610243.

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The Rho GDP dissociation inhibitor (RhoGDI) regulates the activation—inactivation cycle of Rho small GTPases, such as Cdc42 and RhoA, by extracting them from the membrane. To study the roles of Mg2+, phosphatidylinositol 4,5-bisphosphate (PIP2), ionic strength and phosphorylation on the interactions of RhoGDI with Cdc42 and RhoA, we developed a new, efficient and reliable method to produce prenylated Rho proteins using the yeast Saccharomyces cerevisiae. It has been previously reported that protein kinase A (PKA)-treatment of isolated membranes increased RhoA extraction from membranes by RhoGD

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8

Tsvetkova, E. V., G. M. Aleshina, L. E. Leonovа, O. V. Shamova, E. V. Romanovskaya та V. N. Kokryakov. "FUNCTIONAL EFFECTS OF θ-DEFENSINS FROM BLOOD LEUKOCYTES OF BABOON PAPIO HAMADRYAS". Journal of microbiology epidemiology immunobiology, № 5 (28 жовтня 2018): 66–73. http://dx.doi.org/10.36233/0372-9311-2018-5-66-73.

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Aim. Study the functional properties of cationic antimicrobial peptides 0-defensins isolated from baboon Papio hamadryas blood leukocytes. Materials and methods. Baboon 0-defensins were extracted from leukocyte mass using ultrafiltration, preparative electrophoresis and reverse phase high performance liquid chromatography. The test microorganisms used were Gram-negative bacteria Escherichia coli, Gram-positive bacteria Listeria monocytogenes and Staphylococcus aureus, and fungi Candida albicans. Minimal inhibitory concentrations (MICs) were determined by testing serial dilutions of the test pe

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9

Pham, Tien Duc, Thi Ngan Vu, Hai Long Nguyen, Pham Hai Phong Le, and Thi Sim Hoang. "Adsorptive Removal of Antibiotic Ciprofloxacin from Aqueous Solution Using Protein-Modified Nanosilica." Polymers 12, no. 1 (2020): 57. http://dx.doi.org/10.3390/polym12010057.

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The present study aims to investigate adsorptive removal of molecular ciprofloxacin using protein-modified nanosilica (ProMNS). Protein was successfully extracted from Moringa seeds while nanosilica was synthesized from rice husk. Fourier-transform infrared (FTIR), ultraviolet visible (UV-Vis) and high-performance liquid chromatography (HPLC) were used to evaluate the characterization of protein. Adsorption of protein onto nanosilica at different pH and ionic strength was thoroughly studied to modify nanosilica surface. The removal efficiency of antibiotic ciprofloxacin (CFX) increased from 56

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10

Braginets, O. G., V. V. Ivasyk, B. O. Kondratskyi, D. L. Kachmaryk, and V. L. Novak. "The possibility of using silochrome sorbents for proteinase inhibitor aprotinin." Infusion & Chemotherapy, no. 3.1 (October 11, 2020): 13–14. http://dx.doi.org/10.32902/2663-0338-2020-3.1-09.

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Background. Aprotinin is a polypeptide, a proteinase inhibitor of natural origin. It inhibits kallikrein, kininogenase, plasmin, trypsin, chymotrypsin; blocks the activator of profibrinolysin, which helps to stop bleeding. Aprotinin is obtained from the lungs of cattle. Objective. To study the sorption of aprotinin on silochromic sorbents. Materials and methods. Affinity sorbents based on silochrome were used in the work: p-chlorobenzyl-silochrome, active bright blue K-silochrome, aminopropyl silochrome, phenyl-diol-silochrome, phenyl-glutaryl-silochrome. The optical density was me

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11

Lindahl, T. L., P. I. Ohlsson, and B. Wiman. "The mechanism of the reaction between human plasminogen-activator inhibitor 1 and tissue plasminogen activator." Biochemical Journal 265, no. 1 (1990): 109–13. http://dx.doi.org/10.1042/bj2650109.

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The structural events taking place during the reaction between PAI-1 (plasminogen-activator inhibitor 1) and the plasminogen activators sc-tPA (single-chain tissue plasminogen activator) and tc-tPA (two-chain tissue plasminogen activator) were studied. Complexes were formed by mixing sc-tPA or tc-tPA with PAI-1 in slight excess (on an activity basis). The complexes were purified from excess PAI-1 by affinity chromatography on fibrin-Sepharose. Examination of the purified complexes by SDS/polyacrylamide-gel electrophoresis (SDS/PAGE) and N-terminal amino acid sequence analysis demonstrated that

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12

SAWANT, J. D., K. K. PATIL, and G. S. GOKAVI. "Kinetics and Mechanism of Oxidation of Metformin Hydrochloride by Hexamolybdocobaltate(III) in Acidic Medium." Asian Journal of Chemistry 33, no. 1 (2020): 15–20. http://dx.doi.org/10.14233/ajchem.2021.22904.

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The oxidation of metformin hydrochloride by Anderson-Evans type hexamolybdocobaltate(III) anion was investigated under pseudofirst- order condition in acidic medium at 298 K. The rate of reaction is accelerated by increase in the concentration of H+ ion. The decrease in the reaction rate with increase in the concentration of the oxidant [H6CoMo6O24]3- anion and added molybdate ion kinetically indicate existence of the prior equilibria between various forms of the oxidant. In present study, the oxidant exists in monomers [H6CoMo6O24]3- anion, [H5CoMo5O20]2- anion and dimer [H4Co2Mo10O38]6- form

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13

Romanenko, Victor G., George H. Rothblat, and Irena Levitan. "Sensitivity of Volume-regulated Anion Current to Cholesterol Structural Analogues." Journal of General Physiology 123, no. 1 (2003): 77–88. http://dx.doi.org/10.1085/jgp.200308882.

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Depletion of membrane cholesterol and substitution of endogenous cholesterol with its structural analogues was used to analyze the mechanism by which cholesterol regulates volume-regulated anion current (VRAC) in endothelial cells. Depletion of membrane cholesterol enhanced the development of VRAC activated in a swelling-independent way by dialyzing the cells either with GTPγS or with low ionic strength solution. Using MβCD–sterol complexes, 50–80% of endogenous cholesterol was substituted with a specific analogue, as verified by gas-liquid chromatography. The effects of cholesterol depletion

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14

Ooi, Linda S. M., Elaine Y. L. Wong, Lawrence C. M. Chiu, Samuel S. M. Sun, and Vincent E. C. Ooi. "Antiviral and Anti-proliferative Glycoproteins from the Rhizome of Smilax glabra Roxb (Liliaceae)." American Journal of Chinese Medicine 36, no. 01 (2008): 185–95. http://dx.doi.org/10.1142/s0192415x08005692.

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The glycoproteins possessing antiviral and anti-proliferative activities were isolated from the Chinese medicinal herb Smilax glabra (known as tufuling), by extraction with 0.2 M NaCl , ammonium sulfate precipitation, fetuin-agarose affinity chromatography and gel filtration. The molecular mass of the fetuin-binding glycoprotein (designated SGPF2) was estimated to be about 58 kDa, with a major protein subunit of 26 kDa. The non-fetuin binding glycoproteins (in the unadsorbed fraction) were further separated into 5 different subfractions (SGPF1a–SGPF1e) with anion-exchange chromatography, all o

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15

Shaw, Matthew J., Pavel N. Nesterenko, Greg W. Dicinoski, and Paul R. Haddad. "Retention Characteristics of Lanthanide Ions on a Mixed Phosphonic Acid - Carboxylic Acid Cation Exchanger." Australian Journal of Chemistry 56, no. 3 (2003): 201. http://dx.doi.org/10.1071/ch02247.

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The chromatographic behaviour of lanthanide ions on a dual phosphonate- and carboxylate-functionalized ion-exchange resin (Dionex IonPac CS12A and CG12A) was studied using various mobile phase compositions. By suppressing ion-exchange interactions through increasing the ionic strength of the eluent, the column selectivity changed to that of a chelation mechanism via the phosphonate functional groups. Retention was based on the varying conditional stability constants of the lanthanide ions with the phosphonate groups. Eluent pH was additionally found to exert a strong influence on analyte reten

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16

Paleologou, Michael, Song Li та William C. Purdy. "Liquid chromatographic retention behaviour and separation of chlorophenols on a β-cyclodextrin bonded-phase column. Part III. Diaromatic chlorophenols". Canadian Journal of Chemistry 68, № 7 (1990): 1208–14. http://dx.doi.org/10.1139/v90-187.

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The liquid chromatographic retention behaviour of 16 diaromatic phenols and chlorophenols (PCB metabolic analogues) on a β-cyclodextrin bonded-phase column was investigated with respect to mobile-phase composition, pH, temperature, and ionic strength. The mechanistic aspects of retention of these compounds on the β-cyclodextrin column were studied and compared to other reversed-phase columns. Comparison is also made to the liquid chromatographic retention behaviour and separation of monoaromatic chlorophenols on the same column. The size, shape, and spatial geometry of each substrate appears t

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17

Zlotnick, Adam, Pablo Ceres, Sushmita Singh, and Jennifer M. Johnson. "A Small Molecule Inhibits and Misdirects Assembly of Hepatitis B Virus Capsids." Journal of Virology 76, no. 10 (2002): 4848–54. http://dx.doi.org/10.1128/jvi.76.10.4848-4854.2002.

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ABSTRACT Hepatitis B virus (HBV) capsids play an important role in viral nucleic acid metabolism and other elements of the virus life cycle. Misdirection of capsid assembly (leading to formation of aberrant particles) may be a powerful approach to interfere with virus production. HBV capsids can be assembled in vitro from the dimeric capsid protein. We show that a small molecule, bis-ANS, binds to capsid protein, inhibiting assembly of normal capsids and promoting assembly of noncapsid polymers. Using equilibrium dialysis to investigate binding of bis-ANS to free capsid protein, we found that

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18

Lolli, Graziano, Denise Naressi, Stefania Sarno та Roberto Battistutta. "Characterization of the oligomeric states of the CK2 α2β2 holoenzyme in solution". Biochemical Journal 474, № 14 (2017): 2405–16. http://dx.doi.org/10.1042/bcj20170189.

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The regulatory mechanism of protein kinase CK2 has still to be fully clarified. The prevailing hypothesis is that CK2 is controlled by a self-polymerisation mechanism leading to inactive supramolecular assemblies that, when needed, can be disassembled into the α2β2 monomer, the active form of the holoenzyme. In vitro, monomeric α2β2 seems present only at high ionic strengths, typically 0.35–0.50 M NaCl, while at lower salt concentrations oligomers are formed. In the present study, size-exclusion chromatography (SEC), dynamic light scattering (DLS), small-angle X-ray scattering (SAXS) and mutag

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19

Lebrazi, Jamal, Gérard Helft, Mustapha Abdelouahed, et al. "Human Anti-Streptokinase Antibodies Induce Platelet Aggregation in an Fc Receptor (CD32) Dependent Manner." Thrombosis and Haemostasis 74, no. 03 (1995): 938–42. http://dx.doi.org/10.1055/s-0038-1649851.

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SummaryExposure to streptokinase (SK) elicits anti-SK antibodies (Abs), which inhibit fibrinolysis and induce platelet aggregation. The mechanism of the latter is not fully understood, although it seems to involve platelet binding by a plasminogen streptokinase and anti-SK ternary complex. Anti-SK Abs were purified by affinity chromatography from serum of patients having received SK for acute myocardial infarction (AMI), and were shown to be of the IgG type. Their effects were studied with (i) human platelets in citrated plasma in the presence of SK or acetylated plasminogen-SK activator compl

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20

Little, D., R. Weselake, K. Pomeroy, T. Furukawa-Stoffer, and J. Bagu. "Solubilization and characterization of diacylglycerol acyltransferase from microspore-derived cultures of oilseed rape." Biochemical Journal 304, no. 3 (1994): 951–58. http://dx.doi.org/10.1042/bj3040951.

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Particulate fractions prepared from microspore-derived (MD) embryos of oilseed rape (Brassica napus L. cv. Reston) and an embryogenic MD cell suspension culture of oilseed rape (B. napus L. cv. Jet Neuf) were used as a source of diacylglycerol acyltransferase (DGAT, EC 2.3.1.20) for enzyme characterization and development of a solubilization procedure. DGAT activity in the 1500-100,000 g fraction from MD embryos was stimulated 4-5-fold by 3 to 4 mg of BSA/ml of reaction mixture. DGAT activity from MD embryos was stimulated 2-3-fold by fluoride salts and 1.4-fold by NaCl, whereas iodide salts c

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21

Mambula, Salamatu S., Elizabeth R. Simons, Ryan Hastey, Michael E. Selsted, and Stuart M. Levitz. "Human Neutrophil-Mediated Nonoxidative Antifungal Activity against Cryptococcus neoformans." Infection and Immunity 68, no. 11 (2000): 6257–64. http://dx.doi.org/10.1128/iai.68.11.6257-6264.2000.

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ABSTRACT It has long been appreciated that polymorphonuclear leukocytes (PMN) kill Cryptococcus neoformans, at least in part via generation of fungicidal oxidants. The aim of this study was to examine the contribution of nonoxidative mechanisms to the inhibition and killing of C. neoformans. Treatment of human PMN with inhibitors and scavengers of respiratory burst oxidants only partially reversed anticryptococcal activity, suggesting that both oxidative and nonoxidative mechanisms were operative. To define the mediators of nonoxidative anticryptococcal activity, PMN were fractionated into cyt

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22

Bryan, J., and L. M. Coluccio. "Kinetic analysis of F-actin depolymerization in the presence of platelet gelsolin and gelsolin-actin complexes." Journal of Cell Biology 101, no. 4 (1985): 1236–44. http://dx.doi.org/10.1083/jcb.101.4.1236.

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Platelet gelsolin (G), a 90,000-mol-wt protein, binds tightly to actin (A) and calcium at low ionic strength to form a 1:2:2 complex, GA2Ca2 (Bryan, J., and M. Kurth, 1984, J. Biol. Chem. 259:7480-7487). Chromatography of actin and gelsolin mixtures in EGTA-containing solutions isolates a stable binary complex, GA1Ca1 (Kurth, M., and J. Bryan, 1984, J. Biol. Chem. 259:7473-7479). The effects of platelet gelsolin and the binary gelsolin-actin complex on the depolymerization kinetics of rabbit skeletal muscle actin were studied by diluting pyrenyl F-actin into gelsolin or complex-containing buff

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23

Kreusser, Jannette, Fabian Jirasek, and Hans Hasse. "Influence of Salts on the Adsorption of Lysozyme on a Mixed-Mode Resin." Adsorption Science & Technology 2021 (January 23, 2021): 1–11. http://dx.doi.org/10.1155/2021/6681348.

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Mixed-mode chromatography (MMC), which combines features of ion exchange chromatography (IEC) and hydrophobic interaction chromatography (HIC), is an interesting method for protein separation and purification. The design of MMC processes is challenging as adsorption equilibria are influenced by many parameters, including ionic strength and the presence of different salts in solution. Systematic studies on the influence of those parameters in MMC are rare. Therefore, in the present work, the influence of four salts, namely, sodium chloride, sodium sulfate, ammonium chloride, and ammonium sulfat

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24

Flückiger, R., and T. Woodtli. "Effect of temperature on quantifying glycated (glycosylated) hemoglobin by cation-exchange chromatography." Clinical Chemistry 31, no. 1 (1985): 114–17. http://dx.doi.org/10.1093/clinchem/31.1.114.

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Abstract As a consequence of nonideal chromatographic conditions, values for stable glycated hemoglobin (HbA1c) determined by cation-exchange chromatography in a commercial minicolumn system (y) or by "high-performance" liquid chromatography (x) differ markedly, yielding the regression line y = 0.82x + 0.6. With use of the protocol specified by the manufacturer, 20% of the HbA1c peak is not collected in the HbA1c fraction. Increasing the ionic strength of the eluting buffer by increasing the operating temperature to 28 degrees C increases the rate of elution from the minicolumn, making results

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25

Guo, Mi Mi, Hao Guo Tang, Hong Juan Yao, and Jie Zhi Guo. "Study on the Isolation of Polysaccharide from Purple Sweet Potato by DEAE-Cellulose 52." Advanced Materials Research 690-693 (May 2013): 1286–91. http://dx.doi.org/10.4028/www.scientific.net/amr.690-693.1286.

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In this thesis the chromatography on DEAE-Cellulose 52 was used to isolate the crude polysaccharide from purple sweet potato (PPSP) . To get the purest polysaccharide from the purple sweet potato for the purpose, the influence of different pH environments and whether the fractions eluted with the high and low ionic strength eluents in corresponding pH environment during the elution process had the hybrid phenomenon were studied. Finally, results suggested that the purest polysaccharide of purple sweet potato would be got in the neutral and low ionic strength solution of NaCl when the crude pol

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26

Frey, D. D. "Local-Equilibrium Behavior of Retained pH and Ionic Strength Gradients in Preparative Chromatography." Biotechnology Progress 12, no. 1 (1996): 65–72. http://dx.doi.org/10.1021/bp950061e.

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27

Šlais, K. "Sample-induced internal gradient and ionic strength in ion-exclusion microcolum liquid chromatography." Journal of Chromatography A 469 (January 1989): 223–29. http://dx.doi.org/10.1016/s0021-9673(01)96457-x.

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28

Zhang, Liangyi, Thomas Patapoff, Dell Farnan, and Boyan Zhang. "Improving pH gradient cation-exchange chromatography of monoclonal antibodies by controlling ionic strength." Journal of Chromatography A 1272 (January 2013): 56–64. http://dx.doi.org/10.1016/j.chroma.2012.11.060.

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29

McNay, Jennifer L. M., John P. O'Connell, and Erik J. Fernandez. "Protein unfolding during reversed-phase chromatography: II. Role of salt type and ionic strength." Biotechnology and Bioengineering 76, no. 3 (2001): 233–40. http://dx.doi.org/10.1002/bit.10016.

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Baños, F. Guillermo Díaz, Ana I. Díez Peña, J. Ginés Hernánez Cifre, M. Carmen López Martínez, Alvaro Ortega, and José García de la Torre. "Influence of ionic strength on the flexibility of alginate studied by size exclusion chromatography." Carbohydrate Polymers 102 (February 2014): 223–30. http://dx.doi.org/10.1016/j.carbpol.2013.11.023.

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Yuan, X., B. E. Richter, K. Jiang, et al. "Carbonated water for the separation of carboxylic compounds: a chromatography approach." Green Chemistry 20, no. 2 (2018): 440–48. http://dx.doi.org/10.1039/c7gc02812a.

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Малахова, И. И., В. Д. Красиков, Н. И. Горшков, А. Н. Беляев, and С. М. Староверов. "Planar complexation chromatography of transition metal ions." Сорбционные и хроматографические процессы 17, no. 4 (2018): 682–88. http://dx.doi.org/10.17308/sorpchrom.2017.17/428.

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The method for analysis of transition metal ions (Zn(II), Cu(II), Со(II), Ni(II), Fe(III)) by high-performance planar (thin layer) chromatography with the use of sorbents modified by chelating fragments of iminodiacetic acid was developed. The correlation between retention factor (Rf) and physico-chemical parameters of the separated systems was studied. It was demonstrated that unlike the pH value, ionic strength of a solution does not exert significant influence on resolution and mobility of transition metal cations

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33

Travis Gallagher, D., Qianwen Pan, and Gary L. Gilliland. "Mechanism of ionic strength dependence of crystal growth rates in a subtilisin variant." Journal of Crystal Growth 193, no. 4 (1998): 665–73. http://dx.doi.org/10.1016/s0022-0248(98)00536-3.

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34

Ghandchi, Majid, and Reza Hadjiaghaie Vafaie. "AC electrothermal actuation mechanism for on-chip mixing of high ionic strength fluids." Microsystem Technologies 23, no. 5 (2016): 1495–507. http://dx.doi.org/10.1007/s00542-016-3188-5.

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35

Everett, Steven A., Medeleine F. Dennis, Kantilal B. Patel, Peter Wardman, and Michael R. L. Stratford. "High-performance ion chromatography applied to free-radical mechanisms in drug design the problem of ion analysis at high ionic strengths." Journal of Chromatography A 770, no. 1-2 (1997): 273–79. http://dx.doi.org/10.1016/s0021-9673(96)01029-1.

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Hiremath, M. I., R. S. Shettar, and S. T. Nandibewoor. "Kinetics and Mechanism of Oxidation of L-proline by Trivalent Copper: A free radical intervention and decarboxylation." E-Journal of Chemistry 1, no. 5 (2004): 216–27. http://dx.doi.org/10.1155/2004/984054.

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The kinetics of oxidation of L-proline by diperiodatocuprate(III) (DPC) in aqueous alkaline medium at a constant ionic strength of 0.10 mol dm-3was studied spectrophotometrically. The reaction between DPC and L-proline in alkaline medium exhibits 2:1 stoichiometry (DPC: L-Proline). The reaction is of first order in [DPC], less than unit order in [L-proline] and [alkali]. Periodate has no effect on the rate of reaction. The reaction rate increases with increase in ionic strength and decrease in solvent polarity of the medium. Effect of added products and ionic strength of the reaction medium ha

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Vadillo-Rodríguez, Virginia, Henk J. Busscher, Willem Norde, Joop de Vries, and Henny C. van der Mei. "Dynamic Cell Surface Hydrophobicity of Lactobacillus Strains with and without Surface Layer Proteins." Journal of Bacteriology 186, no. 19 (2004): 6647–50. http://dx.doi.org/10.1128/jb.186.19.6647-6650.2004.

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ABSTRACT Variations in surface hydrophobicity of six Lactobacillus strains with and without an S-layer upon changes in ionic strength are derived from contact angle measurements with low- and high-ionic-strength aqueous solutions. Cell surface hydrophobicity changed in response to changes in ionic strength in three out of the six strains, offering these strains a versatile mechanism to adhere to different surfaces. The dynamic behavior of the cell surface hydrophobicity could be confirmed for two selected strains by measuring the interaction force between hydrophobic and hydrophilic tips with

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Sun, Nan, and Shui Li Yu. "Adsorption Mechanism of Humic Acid on Attapulgite Based on Stumm-Schindle Surface Complexation Model." Advanced Materials Research 630 (December 2012): 99–105. http://dx.doi.org/10.4028/www.scientific.net/amr.630.99.

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Attapulgite from Xuyi in Jiangsu was characterized by X-ray spectrometer and FT-IR spectrophotometer, the coordination reaction degree of attapulgite/water interface and adsorption mechanism of humic acid(HA) on attapulgite was analyzed by Stumm-Schindle(SS) surface complexation model. The results showed that the main component of attapulgite is magnesia-alumina acid salt, the surface charge on attapulgite adapted from hydrolysates of Si-O and Al-O broken bond. After adsorption, zeta potential decreased firstly and then increased with ionic strength increasing, reduced with a pH value increasi

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Giroux, Louis, and Dwight J. Barkley. "Separation of metal-cyanide complexes by reversed-phase ion-interaction high-performance liquid chromatography." Canadian Journal of Chemistry 72, no. 2 (1994): 269–73. http://dx.doi.org/10.1139/v94-041.

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Reversed-phase ion-interaction chromatography has been used to study the separation of Cu(I), Ag(I), Ni(II), Au(I), Co(III), Fe(III), and Fe(II) cyano complexes on silica and carbon-based reversed-phases with UV detection at 215 nm. Separation of the metal-cyanide complexes was affected by a number of experimental factors including the nature and concentration of the organic modifier, nature and concentration of the ion-pairing reagent, pH, and ionic strength of the mobile phase. Differences between the elution order of metallo-cyanides observed in the present work and in other investigations

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Perkins, Tracy W., Derek S. Mak, Thatcher W. Root, and Edwin N. Lightfoot. "Protein retention in hydrophobic interaction chromatography: modeling variation with buffer ionic strength and column hydrophobicity." Journal of Chromatography A 766, no. 1-2 (1997): 1–14. http://dx.doi.org/10.1016/s0021-9673(96)00978-8.

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Chuang, Jau-Yi. "Size exclusion chromatography of starch with dimethyl sulfoxide as the mobile phase: Ionic-strength effect." Journal of Applied Polymer Science 45 (1990): 227–42. http://dx.doi.org/10.1002/app.1990.070450014.

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Cai, Chun-hua, Vincent A. Romano, and Paul L. Dubin. "Ionic strength dependence of protein retention on Superose 12 in SEC-IEC mixed mode chromatography." Journal of Chromatography A 693, no. 2 (1995): 251–61. http://dx.doi.org/10.1016/0021-9673(94)01064-l.

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Araujo, Anderson Mendes, Josimar Henrique de Lima Lessa, Liniker André Ferreira, Luiz Roberto Guimarães Guilherme, and Guilherme Lopes. "Soil management and ionic strength on selenite retention in oxidic soils." Ciência e Agrotecnologia 42, no. 4 (2018): 395–407. http://dx.doi.org/10.1590/1413-70542018424007318.

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ABSTRACT Sorption of selenium (Se) on soils may be influenced by factors that are changed though agricultural practices usually performed for crop production, such as soil pH, competing anion and organic matter contents, among others. This study aimed to evaluate the influence of soil management and ionic strength (IS) on Se retention in Brazilian soils, which is important to predict Se availability in both systems, native and cultivated soils. For that, adsorption and desorption reactions of Se were evaluated in 16 soil samples (eight from cultivated soils and eight from native soils), using

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Konno, Hirofumi, and Jun Takeda. "Synthesis, Acid-Base Properties, Kinetics and Mechanism of Cu2+ Incorporation into Water-Soluble Highly Substituted Porphyrins." Journal of Porphyrins and Phthalocyanines 21, no. 09 (2017): 611–21. http://dx.doi.org/10.1142/s1088424617500572.

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The synthesis, acid-base properties, and kinetics of Cu[Formula: see text] incorporation into water-soluble highly substituted porphyrins were studied. The basicity increased and the stepwise acid-base equilibrium was clarified by increasing the number of phenyl groups at the [Formula: see text] position, and the basicity of a dodeca-substituted porphyrin increased with the ionic strength. The metalation reaction of the dodeca-substituted porphyrin with Cu[Formula: see text] in aqueous solution revealed a biphasic absorbance change at 453 nm. Plots of [Formula: see text] or[Formula: see text]

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VAN DEN HAZEL, H. Bart, Anne Mette WOLFF, Morten C. KIELLAND-BRANDT, and Jakob R. WINTHER. "Mechanism and ion-dependence of in vitro autoactivation of yeast proteinase A: possible implications for compartmentalized activation in vivo." Biochemical Journal 326, no. 2 (1997): 339–44. http://dx.doi.org/10.1042/bj3260339.

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Yeast proteinase A is synthesized as a zymogen which transits through the endoplasmic reticulum, the Golgi complex and the endosome to the vacuole. On arrival in the vacuole, activation takes place. It has previously been found that proteinase A can activate autocatalytically; however, the propeptide of proteinase A shows essentially no similarity to other known aspartic proteinase propeptides. To understand why proteinase A activation occurs rapidly in the vacuole but not at all in earlier compartments, we have purified the zymogen and investigated the conditions that trigger autoactivation a

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Zhang, K., Z. F. Song, Y. Yan, and Q. M. Chen. "Colloidal Silica Particles with Bimodal Final Size Distribution: Ion-Induced Nucleation Mechanism." Solid State Phenomena 121-123 (March 2007): 105–8. http://dx.doi.org/10.4028/www.scientific.net/ssp.121-123.105.

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Colloidal silica particles, Bimodal size distribution, Nucleation Abstract. Colloidal silica particles with bimodal size distribution have been prepared by the hydrolysis of tetraethylorthosilicate in alcoholic solutions of water and ammonia as catalyst. Experimental conditions such as concentration of NaCl, amount of water and reaction temperature were investigated to reveal the formation mechanism of the colloidal silica particles. The nucleation process of colloidal silica particles with bimodal size distribution depends on the hydrolysis rate of TEOS and the ionic strength of reaction medi

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Lim, Young-Il, Sten Bay Jørgensen, and In-Ho Kim. "Computer-aided model analysis for ionic strength-dependent effective charge of protein in ion-exchange chromatography." Biochemical Engineering Journal 25, no. 2 (2005): 125–40. http://dx.doi.org/10.1016/j.bej.2005.04.021.

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Dickhout, Janneke, Rob Lammertink, and Wiebe de Vos. "Membrane Filtration of Anionic Surfactant Stabilized Emulsions: Effect of Ionic Strength on Fouling and Droplet Adhesion." Colloids and Interfaces 3, no. 1 (2019): 9. http://dx.doi.org/10.3390/colloids3010009.

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Membranes hold great potential to be used for the successful treatment of oily waste water, but membrane fouling leads to substantial decreases in performance. Here we study the impact of ionic strength on membrane fouling from an emulsion stabilized by the anionic surfactant sodium dodecyl sulfonate (SDS). For this we use a unique combinatorial approach where droplet adhesion to a cellulose surface in a flow cell is compared to membrane fouling (flux decline) on a cellulose membrane. In the initial membrane fouling stages droplet adhesion dominates. While the flow cell demonstrates a high num

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Jose, Timy P., Sharanappa T. Nandibewoor, and Suresh M. Tuwar. "Mechanism of Oxidation of L-Histidine by Heptavalent Manganese in Alkaline Medium." E-Journal of Chemistry 2, no. 1 (2005): 75–85. http://dx.doi.org/10.1155/2005/206147.

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The kinetics of oxidation of L-histidine by manganese(VII) in aqueous alkaline medium at a constant ionic strength of 0.05 mol dm-3was studied spectrophotometrically. The reaction between permanganate and L-histidine in alkaline medium exhibits 2:1 stoichiometry (KMnO4: L-histidine). The reaction is of first order in [KMnO4], less than unit order in [L-histidine] and [alkali]. Decrease in the dielectric constant of the medium decreases the rate of reaction. Effect of added products and ionic strength of the reaction medium have been investigated. The main products were identified by spot test

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Sun, Pinghe, Junyi Zhu, Binkui Zhao, et al. "Study on the Mechanism of Ionic Stabilizers on Shale Gas Reservoir Mechanics in Northwestern Hunan." Energies 12, no. 12 (2019): 2453. http://dx.doi.org/10.3390/en12122453.

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The shale of the lower Cambrian Niutitang formation in northwestern Hunan is an ideal reservoir for shale gas. There is a close connection between borehole stability and drilling fluid in shale gas drilling. Ionic stabilizer is a new type of stratum consolidation agent that inhibits the hydration expansion of clay minerals and improves mechanical strength of the borehole. The traditional idea of pore wall protection is to use drilling fluid additives to prevent shale from interacting with water. However, ionic stabilizer can change the hydrophilic of clay minerals in shale, making the particle

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