scholarly journals Temperature Effect on the Adsorption and Volumetric Properties of Aqueous Solutions of Kolliphor®ELP

Molecules ◽  
2020 ◽  
Vol 25 (3) ◽  
pp. 743
Author(s):  
Katarzyna Szymczyk ◽  
Magdalena Szaniawska ◽  
Joanna Krawczyk
Keyword(s):  
Surface Tension ◽  
Steady State ◽  
Critical Micelle Concentration ◽  
Aqueous Solutions ◽  
Water Structure ◽  
Volumetric Properties ◽  
Structural Effects ◽  
Solvent Interactions ◽  
Steady State Fluorescence ◽  
Fluorescence Measurements

Density, viscosity and surface tension of Kolliphor® ELP, the nonionic surfactant aqueous solutions were measured at temperature T = 293–318 K and at 5K interval. Steady-state fluorescence measurements have been also made using pyrene as a probe. On the basis of the obtained results, a number of thermodynamic, thermo-acoustic and anharmonic parameters of the studied surfactant have been evaluated and interpreted in terms of structural effects and solute–solvent interactions. The results suggest that the molecules of studied surfactant at concentrations higher than the critical micelle concentration act as structure makers of the water structure.

Preparation and Properties of Amide Surfactants

2012 ◽  
Vol 550-553 ◽  
pp. 99-102
Author(s):  
Bao Cai Xu ◽  
Gui Ju Zhang ◽  
Yun Xia Li ◽  
Lu Cui
Keyword(s):  
Surface Tension ◽  
Critical Micelle Concentration ◽  
Aqueous Solutions ◽  
Surface Activity ◽  
Surface Tensions ◽  
Equilibrium Surface ◽  
Minimum Surface Tension ◽  
Dilute Aqueous Solutions ◽  
Lipophilic Groups ◽  
Long Chain

Amide surfactants have modified structures with lipophilic groups connecting hydrophilic groups through amido bond. The preparation of three families of amide surfactants including long chain N-acyl sarcosinates, amidopropyl dimethyl hydroxypropyl sulfobetaines and lauryl amidopropyl trimethyl ammoniums were discussed. The study of the surface activity of these compounds by measuring the equilibrium surface tensions of their dilute aqueous solutions were described. The minimum surface tension and the critical micelle concentration values of these compounds are given.

Exploration of interactions between decyl-β-d-glucopyranoside and bovine serum albumin in aqueous solution

RSC Advances ◽  
2016 ◽  
Vol 6 (24) ◽  
pp. 19700-19706 ◽  
Author(s):  
Gongke Wang ◽  
Huimin Hou ◽  
Ye Chen ◽  
Changling Yan ◽  
Guangyue Bai ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Surface Tension ◽  
Steady State ◽  
Bovine Serum Albumin ◽  
Serum Albumin ◽  
Absorption Spectroscopy ◽  
Bovine Serum ◽  
Aqueous Media ◽  
Steady State Fluorescence

The interactions between decyl-β-d-glucopyranoside (DG) and bovine serum albumin (BSA), in aqueous media, were investigated through the use of surface tension, steady-state fluorescence, and UV-vis absorption spectroscopy measurements.

Ultrafast transient-absorption and steady-state fluorescence measurements on 2-aminopurine substituted dinucleotides and 2-aminopurine substituted DNA duplexes

2004 ◽  
Vol 6 (1) ◽  
pp. 154 ◽  
Author(s):  
Olaf F. A. Larsen ◽  
Ivo H. M. van Stokkum ◽  
Frank L. de Weerd ◽  
Mikas Vengris ◽  
Charuvila T. Aravindakumar ◽  
...  
Keyword(s):  
Steady State ◽  
Transient Absorption ◽  
Dna Duplexes ◽  
Steady State Fluorescence ◽  
Fluorescence Measurements ◽  
Ultrafast Transient Absorption

Chloroplast Cytochrome b6/f and ATP Synthase Complexes in Tobacco: Transformation With Antisense RNA Against Nuclear-Encoded Transcripts for the Rieske FeS and ATPδ Polypeptides

1995 ◽  
Vol 22 (2) ◽  
pp. 285 ◽  
Author(s):  
GD Price ◽  
JW Yu ◽  
SV Caemmerer ◽  
JR Evans ◽  
WS Chow ◽  
...  
Keyword(s):  
Steady State ◽  
Atp Synthase ◽  
Antisense Rna ◽  
Photochemical Quenching ◽  
Cdna Clones ◽  
Wild Type ◽  
Cytochrome B6 ◽  
Steady State Fluorescence ◽  
Fluorescence Measurements ◽  
Non Photochemical Quenching

Tobacco plants with reduced amounts and activities of both the chloroplast cytochrome b6/f and ATP synthase complexes have been produced using antisense RNA techniques. Antisense constructs were generated from tobacco cDNA clones coding for the Rieske FeS protein and the δ subunit of the b6/f and ATP synthase complexes respectively. Transformants with altered activities were selected using pulse-modulated fluorescence measurements. The b6/ftransformants showed high levels of steady-state fluorescence and reduced levels of both photochemical and non-photochemical quenching. In striking contrast, the ATP synthase transformants showed low levels of steady-state fluorescence and greatly increased levels of non-photochemical quenching. Transformants with a range of suppression were isolated for both constructs, in some cases with photosynthesis reduced to less than 10% of wild-type values. The most severely affected transformants showed extremely slow growth and in some cases they were unable to grow and produce seed. Progeny from the R1 seed from several cytochrome b6/f transformants have been analysed and show segregation of phenotypes ranging from intermediate to severe in repression. Intermediate and severe phenotype plants showed a reduction in Rieske FeS mRNA of more than 90% while FeS polypeptide was reduced to 60 and 86% of wild type. There was a strong correlation between photosynthesis at air and Rieske FeS polypeptide content in the antisense plants suggesting that the cytochrome b6/f complex was a major determinant of photosynthetic rate under these conditions. Photoinhibition studies of FeS antisense plants showed that there was a reduced activity of the xanthophyll cycle in the most severe plants, consistent with a reduction in the transthylakoid pH gradient and a lowered non-photochemical quenching. Preliminary studies of the ATPδ antisense plants showed that they also had reduced levels of mRNA and ATPδ polypeptide.

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