Salt effect on solutions of nonionic surfactants and its influence on the stability of polymerized microemulsions

1988 ◽  
Vol 125 (1) ◽  
pp. 97-110 ◽  
Author(s):  
Christine Holtzscherer ◽  
Francoise Candau
Keyword(s):  
Nonionic Surfactants ◽  
Salt Effect ◽  
The Stability

Effect of Nonionic Surfactants on the Stability of Hydrophobic Sols

1986 ◽  
pp. 1705-1713 ◽  
Author(s):  
G. D. Botsaris ◽  
Yu. M. Glazman ◽  
G. P. Beronja
Keyword(s):  
Nonionic Surfactants ◽  
The Stability

scholarly journals Redox index of soil carbon stability

2010 ◽  
Vol 34 (5) ◽  
pp. 1543-1551 ◽  
Author(s):  
Marihus Altoé Baldotto ◽  
Maria Cristina Canela ◽  
Luciano Pasqualoto Canellas ◽  
Leonardo Barros Dobbs ◽  
Ary Carlos Xavier Velloso
Keyword(s):  
Humic Acid ◽  
Humic Acids ◽  
Salt Effect ◽  
Spectroscopic Methods ◽  
Weathering Index ◽  
Organic C ◽  
Exchangeable Ca ◽  
The Stability ◽  
Redox Index

As an alternative to the relatively complex and expensive spectroscopic methods, the redox properties of humic acids, determined by potentiometric titrations, have been used to evaluate the stability of soil organic C. The objective of the present study was to establish a Redox Index of C Stability (RICS) and to correlate it with some properties of the humic acids extracted from different modal soils in Brazil (distinct weathering stages or management) to facilitate system comparison. The RICS was efficient for soil comparison and variations were comparable to those of the chemical and spectroscopic methods used for humic acid characterization. The values of soil pH, point of zero salt effect, sum of bases, exchangeable Ca content, weathering index, as well as the humic acid O/C ratio, quinone and semiquinone free radical contents, aromatic C and fluorescence intensity were closely related with the RICS. The RICS was higher in less weathered soils, with more active clays and higher fertility. The RICS values of soils under long-term sugarcane management were ranked in decreasing order: unburned, burned with vinasse, burned without vinasse.

scholarly journals A New Generation of Dihydropyridine Calcium Channel Blockers: Photostabilization of Liquid Formulations Using Nonionic Surfactants

Pharmaceutics ◽  
2019 ◽  
Vol 11 (1) ◽  
pp. 28 ◽  
Author(s):  
Giuseppina Ioele ◽  
Miyase Gözde Gündüz ◽  
Claudia Spatari ◽  
Michele De Luca ◽  
Fedora Grande ◽  
...  
Keyword(s):  
Nonionic Surfactants ◽  
Water Solubility ◽  
High Capacity ◽  
Ethanol Solution ◽  
Multivariate Curve Resolution ◽  
Channel Blockers ◽  
Curve Resolution ◽  
Dihydropyridine Derivative ◽  
The Stability ◽  
New Generation

: The stability profile of a new 1,4-dihydropyridine derivative (DHP), representative of a series with a hexahydroquinoline ring, was studied to design light-stable liquid formulations. This molecule, named M3, has been shown among the analogs to have a high capacity to block both L- and T-type calcium channels. The ethanol solution of the drug was subjected to a photodegradation test, in accordance with standard rules. The concentrations of the drug and its byproducts were estimated using multivariate curve resolution, applied to the spectral data collected during the test. The improvement of both the photostability and water solubility of M3 was investigated by adding the surfactant polysorbate 20 in a 1:5 ratio to aqueous solutions of the drug. These formulations were exposed to stressing light in containers of bleu polyethylene terephthalate (PET), amber PET, and covered amber PET. The best results were obtained when using the covered amber PET container, reaching a degradation percentage of the drug less than 5% after 12 h under an irradiance power of 450 W/m2. The stability of the compound was compared to that of nimodipine (NIM) under the same conditions.

scholarly journals Study of the stability of lipid nanoemulsions with oleic acid

2021 ◽  
Vol 12 (2-2021) ◽  
pp. 174-176
Author(s):  
E. V. Mishchenko ◽  
◽  
E. E. Timofeeva ◽  
A. S. Artamonov ◽  
M. Yu. Koroleva ◽  
...  
Keyword(s):  
Oleic Acid ◽  
Phase Inversion ◽  
Nonionic Surfactants ◽  
Inversion Method ◽  
Ionic Surfactant ◽  
Temperature Phase ◽  
The Stability ◽  
Tween 60 ◽  
Span 60 ◽  
Phase Inversion Method

This work presents the results of a study on the effect of ionic surfactant cetriltrimethylammonium chloride (CTAB) on the size and ζ-potential of lipid nanoemulsions composed of oleic acid, prepared by temperature phase inversion method and stabilized by nonionic surfactants — Tween 60, Span 60

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