scholarly journals The effect of surfactant structure on ribonuclease A–surfactant interactions

1973 ◽  
Vol 135 (3) ◽  
pp. 547-549 ◽  
Author(s):  
Cecilia Blinkhorn ◽  
Malcolm N. Jones
Keyword(s):  
Anionic Surfactant ◽  
Cationic Surfactants ◽  
Ribonuclease A ◽  
Enzymic Activity ◽  
Head Groups ◽  
Surfactant Interactions ◽  
Dodecylamine Hydrochloride

The enzymic activity of ribonuclease A was measured in the presence of several surfactants at pH7.2. Cationic surfactants with trimethylammonium and pyridinium head groups do not deactivate or denature the enzyme, whereas n-dodecylamine hydrochloride, like the anionic surfactant sodium n-dodecyl sulphate, deactivates and denatures ribonuclease A.

scholarly journals The interaction between ribonuclease A and surfactants

1973 ◽  
Vol 135 (1) ◽  
pp. 231-236 ◽  
Author(s):  
Malcolm N. Jones ◽  
Henry A. Skinner ◽  
Edward Tipping ◽  
Alan Wilkinson
Keyword(s):  
Cationic Surfactant ◽  
Anionic Surfactant ◽  
Equilibrium Dialysis ◽  
Ribonuclease A ◽  
Enzymic Activity ◽  
Enthalpy Change ◽  
Dodecyltrimethylammonium Bromide ◽  
Difference Spectra

1. U.v. difference spectra show that the anionic surfactant sodium n-dodecyl sulphate unfolds ribonuclease A at pH7.3 and 10.3, but that the cationic surfactant n-dodecyltrimethylammonium bromide does not affect the conformation of the enzyme. 2. Equilibrium-dialysis experiments show that sodium n-dodecyl sulphate binds to ribonuclease A, but no binding of n-dodecyltrimethylammonium bromide could be detected at pH7.3. 3. The enzymic activity of ribonuclease A is unaffected by n-dodecyltrimethylammonium bromide up to a concentration of 0.03m at 25°C. 4. Ultracentrifuge studies support the conclusion that n-dodecyltrimethylammonium bromide does not interact significantly with ribonuclease A. 5. The enthalpy change as measured by microcalorimetry on binding of sodium n-dodecyl sulphate to ribonuclease A is consistent with an exothermic enthalpy of binding occurring simultaneously with an endothermic enthalpy of chain unfolding.

Aggregation behavior of tetraphenylporphyrin in aqueous surfactant solutions: Chiral premicellar J-aggregate formation

2015 ◽  
Vol 19 (07) ◽  
pp. 845-851 ◽  
Author(s):  
Margaret A. Gradova ◽  
Vladimir V. Artemov ◽  
Anton V. Lobanov
Keyword(s):  
Anionic Surfactant ◽  
Self Assembly ◽  
Photophysical Properties ◽  
Direct Synthesis ◽  
Aggregate Formation ◽  
Experimental Conditions ◽  
Aggregation State ◽  
Supramolecular Chirality ◽  
Surfactant Solutions ◽  
Surfactant Interactions

Porphyrin-surfactant interactions in aqueous solutions are known to result in the selfassembly of various supramolecular structures, including pigment-surfactant complexes, J- and H-aggregates, and solubilized dye species. Detailed studies on the mechanisms of the intermolecular interactions governing the above self-assembly processes allow to predict the aggregation state and hence, the photophysical properties of the dye-surfactant assemblies in order to perform a direct synthesis of the desired porphyrin-based nanostructures at the appropriate experimental conditions. This paper describes a novel example of the surfactant-induced J-aggregate formation from the diprotonated hydrophobic tetraphenylporphyrin species in submicellar aqueous anionic surfactant solutions. The above assemblies are characterized by a rod-like morphology and possess supramolecular chirality according to the CD measurements.

Mixtures of anionic and cationic surfactants with single and twin head groups: Solubilization and adsolubilization of styrene and ethylcyclohexane

2006 ◽  
Vol 9 (1) ◽  
pp. 29-37 ◽  
Author(s):  
A. Fuangswasdi ◽  
A. Charoensaeng ◽  
D. A. Sabatini ◽  
J. F. Scamehorn ◽  
E. J. Acosta ◽  
...  
Keyword(s):  
Cationic Surfactants ◽  
Head Groups ◽  
Anionic And Cationic Surfactants
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