scholarly journals The Structural Effect of Polyoxyethylene Type Nonionic Surfactants on the Stability of W/O Emulsion

1977 ◽  
Vol 26 (4) ◽  
pp. 240-242 ◽  
Author(s):  
Hiromichi SAGITANI ◽  
Shoji YUASA
1986 ◽  
pp. 1705-1713 ◽  
Author(s):  
G. D. Botsaris ◽  
Yu. M. Glazman ◽  
G. P. Beronja

Pharmaceutics ◽  
2019 ◽  
Vol 11 (1) ◽  
pp. 28 ◽  
Author(s):  
Giuseppina Ioele ◽  
Miyase Gözde Gündüz ◽  
Claudia Spatari ◽  
Michele De Luca ◽  
Fedora Grande ◽  
...  

: 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.


2014 ◽  
Vol 38 (1) ◽  
pp. 25-55 ◽  
Author(s):  
Sorina Soare

Populist parties’ dazzling success has been registered in numerous new and old Member states for a while; populism has occupied a crucial position in Romanian politics since the onset of post-communism, with constant emphasis on the iconic role of the people in the democracy, the role of the leader in public statements and in the party’s organisation, the promotion of Manichean and simplistic solutions to the political/economic agenda, as well as the constant use of direct and emotional appeals, etc. Within this framework, the research question is: can Romanian populism be understood as a “temporary” problem of adjustment and adaptation, or is it a deeper structural effect, which requires further attention, considering its potential threats to the stability of the post-communist regime? Considering populism as a multi-faceted phenomenon that cannot be traced to a unique structure or a single/specific agency, the conclusions suggest the existence of an osmotic relationship between deep-rooted populism and democracy in Romania, in the sense that it is difficult to clearly identify which is the cause of the other. As such, the Romanian specificity stems from the constancy of this phenomenon and, above all, from its potential for contamination: populist cries become national mainstream catchwords.


1994 ◽  
Vol 10 (3) ◽  
pp. 375-378 ◽  
Author(s):  
Yoshihiro KUDO ◽  
Takeshi MIYAKAWA ◽  
Yasuyuki TAKEDA ◽  
Hiroaki MATSUDA ◽  
Kazuhisa HIRATANI

2021 ◽  
Vol 12 (2-2021) ◽  
pp. 174-176
Author(s):  
E. V. Mishchenko ◽  
◽  
E. E. Timofeeva ◽  
A. S. Artamonov ◽  
M. Yu. Koroleva ◽  
...  

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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