Ionic strength effect on liquid chromatographic retention of benzenesulfonates on nonpolar adsorbents

1981 ◽  
Vol 59 (14) ◽  
pp. 2179-2183 ◽  
Author(s):  
Terry D. Rotsch ◽  
W. R. Cahill Jr ◽  
Donald J. Pietrzyk ◽  
Frederick F. Cantwell
Keyword(s):  
Ionic Strength ◽  
Electrical Double Layer ◽  
Mobile Phase ◽  
Chromatographic Retention ◽  
Square Root ◽  
Ionic Strength Effect ◽  
Styrene Divinylbenzene ◽  
Chromatographic Resolution ◽  
Liquid Chromatographic ◽  
Strength Effect

Chromatographic retention of substituted benzenesulfonate ions is studied on two nonpolar styrene–divinylbenzene adsorbents as a function of mobile phase ionic strength. On both Amberlite XAD-2 and Hamilton PRP-1, a plot of reciprocal of the capacity factor for each benzenesulfonate versus reciprocal of the square root of ionic strength is linear as predicted by Stern–Gouy–Chapman electrical double layer theory. Chromatographic resolution is improved by using an electrolyte-containing mobile phase.

scholarly journals The role of bivalent ions in the inactivation of bacteriophage ϕ X174 by lipopolysaccharide from Escherichia coli C

1984 ◽  
Vol 223 (1) ◽  
pp. 23-29 ◽  
Author(s):  
E Rowatt
Keyword(s):  
Escherichia Coli ◽  
Ionic Strength ◽  
Electrostatic Repulsion ◽  
Square Root ◽  
Low Concentration ◽  
Ionic Strength Effect ◽  
Bivalent Ions ◽  
Order Of Magnitude ◽  
Strength Effect

The need for Ca2+ in the inactivation of bacteriophage phi X174 by lipopolysaccharide from Escherichia coli C was confirmed. Ca2+ could be replaced almost completely by Na+, but the concentration of Na+ needed was greater by more than an order of magnitude. Other bivalent ions caused inactivation in the same way as Ca2+, and the degree of inactivation varied according to the ion. At 50% inactivation of bacteriophage, the relation between the concentrations of NaCl and of bivalent or tervalent ions (Mx+) fitted the conception that NaCl was neutralizing electrostatic repulsion between virus and lipopolysaccharide by an ionic-strength effect: that is, log[Mx+] varies inversely with square root[NaCl]. The variation in effect of bi- and ter-valent ions and the low concentration needed show that this is not an ionic-strength effect but likely to involve binding to more than one site.

Biosorption-mediated reduction of Cr(VI) using heterotrophically-grown Chlorella vulgaris: Active sites and ionic strength effect

2013 ◽  
Vol 231 ◽  
pp. 94-102 ◽  
Author(s):  
Francesca Pagnanelli ◽  
Nohman Jbari ◽  
Franco Trabucco ◽  
Ma Eugenia Martínez ◽  
Sebastián Sánchez ◽  
...  
Keyword(s):  
Ionic Strength ◽  
Chlorella Vulgaris ◽  
Active Sites ◽  
Ionic Strength Effect ◽  
Mediated Reduction ◽  
Strength Effect

Improved liquid-chromatographic assay of labetalol in plasma.

1987 ◽  
Vol 33 (8) ◽  
pp. 1450-1452 ◽  
Author(s):  
D R Luke ◽  
G R Matzke ◽  
J T Clarkson ◽  
W M Awni
Keyword(s):  
High Performance Liquid Chromatography ◽  
Mobile Phase ◽  
High Performance ◽  
Internal Standard ◽  
Excitation Wavelength ◽  
Plasma Samples ◽  
Standard Curve ◽  
Low Concentrations ◽  
Styrene Divinylbenzene ◽  
Liquid Chromatographic

Abstract This is an assay for labetalol in plasma by "high-performance" liquid chromatography, with 5-(2-[4-(4-chlorophenyl)ethyl]) salicylamide hemihydrate as the internal standard. Plasma samples (500 microL) are extracted with acetonitrile, evaporated under nitrogen, reconstituted in the mobile phase, and injected onto a PRP-1 (Hamilton) column packed with particles of poly(styrene-divinylbenzene) copolymer. Fluorescence, enhanced by post-column introduction of NH4OH, was measured in the effluent (excitation wavelength 340 nm, emission wavelength 418 nm). Retention times for labetalol and the internal standard were 1.99 and 3.32 min, respectively. Inter- and intraday CVs for high and low concentrations of the drug were less than 7.5%. The assay standard curve is linear from 1 to 250 micrograms/L. Some commonly co-administered drugs were tested and did not interfere.

Ionic Strength Effect Alters the Heterogeneous Ozone Oxidation of Methoxyphenols in Going from Cloud Droplets to Aerosol Deliquescent Particles

2020 ◽  
Vol 54 (20) ◽  
pp. 12898-12907 ◽  
Author(s):  
Majda Mekic ◽  
Yiqun Wang ◽  
Gwendal Loisel ◽  
Davide Vione ◽  
Sasho Gligorovski
Keyword(s):  
Ionic Strength ◽  
Cloud Droplets ◽  
Ozone Oxidation ◽  
Ionic Strength Effect ◽  
Strength Effect
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