Interfacial activity of N-8-quinolyl-p-dodecylbenzenesulphonamide and the interfacial mechanism of copper extraction

2007 ◽  
Vol 51 (3) ◽  
pp. 301-313 ◽  
Author(s):  
Jan Szymanowski ◽  
Artur Jakubiak ◽  
Krzysztof Alejski
Keyword(s):  
Copper Extraction ◽  
Interfacial Activity

Interfacial activity and kinetics and mechanism of copper extraction with 2-ethylhexanal oxime

1991 ◽  
Vol 57 (2) ◽  
pp. 283-293 ◽  
Author(s):  
Jan Szymanowski ◽  
Artur Jakubiak ◽  
Krzysztof Alejski
Keyword(s):  
Kinetics And Mechanism ◽  
Copper Extraction ◽  
Interfacial Activity

INTERFACIAL ACTIVITY AND RATE OF COPPER EXTRACTION WITH CHELATE EXTRACTANTS HAVING TWO HYDROXYOXIME MOIETIES

1994 ◽  
Vol 12 (1) ◽  
pp. 87-97 ◽  
Author(s):  
K. Prochaska ◽  
R. Cierpiszewski ◽  
J. Szymanowski ◽  
J. Beger
Keyword(s):  
Copper Extraction ◽  
Interfacial Activity

The Impact of Bioconjugation on the Interfacial Activity of a Protein Biosurfactant

2018 ◽  
Author(s):  
Hossam H Tayeb ◽  
Marina Stienecker ◽  
Anton Middelberg ◽  
Frank Sainsbury
Keyword(s):  
Polyethylene Glycol ◽  
Colloidal Stability ◽  
Point Mutations ◽  
Pharmaceutical Formulations ◽  
Industrial Processes ◽  
Parent Molecule ◽  
Site Specific ◽  
Interfacial Activity ◽  
Surface Active ◽  
The Impact

Biosurfactants, are surface active molecules that can be produced by renewable, industrially scalable biologic processes. DAMP4, a designer biosurfactant, enables the modification of interfaces via genetic or chemical fusion to functional moieties. However, bioconjugation of addressable amines introduces heterogeneity that limits the precision of functionalization as well as the resolution of interfacial characterization. Here we designed DAMP4 variants with cysteine point mutations to allow for site-specific bioconjugation. The DAMP4 variants were shown to retain the structural stability and interfacial activity characteristic of the parent molecule, while permitting efficient and specific conjugation of polyethylene glycol (PEG). PEGylation results in a considerable reduction on the interfacial activity of both single and double mutants. Comparison of conjugates with one or two conjugation sites shows that both the number of conjugates as well as the mass of conjugated material impacts the interfacial activity of DAMP4. As a result, the ability of DAMP4 variants with multiple PEG conjugates to impart colloidal stability on peptide-stabilized emulsions is reduced. We suggest that this is due to constraints on the structure of amphiphilic helices at the interface. Specific and efficient bioconjugation permits the exploration and investigation of the interfacial properties of designer protein biosurfactants with molecular precision. Our findings should therefore inform the design and modification of biosurfactants for their increasing use in industrial processes, and nutritional and pharmaceutical formulations.

Effect of Molecular Structure on Interfacial Activity and Emulsification Property

2012 ◽  
Vol 49 (5) ◽  
pp. 394-397 ◽  
Author(s):  
Lifeng Chen ◽  
Xiutai Zhao ◽  
Zengbao Wang ◽  
Yingrui Bai
Keyword(s):  
Molecular Structure ◽  
Interfacial Activity ◽  
Emulsification Property

Investigating and Optimization of Copper Extraction from Chalcopyrite Concentrate with Hydrogen Peroxide in Presence of Acetic Acid

2017 ◽  
Vol 7 (4) ◽  
Author(s):  
Mehmat Deniz Turan ◽  
Musa Sarikaya ◽  
Z. Abidin Sari ◽  
Ahmet Haxhiaj ◽  
Tolga Depci ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Acetic Acid ◽  
Copper Extraction ◽  
Chalcopyrite Concentrate

Effects of Copper Extraction-Stripping Loops on Entrainment in Aqueous Raffinate

2014 ◽  
Vol 908 ◽  
pp. 18-21
Author(s):  
Yan Jun Liu ◽  
Xiao Rong Liu ◽  
Hui Li ◽  
Yong Sheng Li ◽  
Qing Li ◽  
...  
Keyword(s):  
Surface Tension ◽  
Solvent Extraction ◽  
Early Stage ◽  
Organic Chemical ◽  
Copper Extraction ◽  
Organic Chemicals ◽  
Stabilization Mechanism ◽  
Absolute Value ◽  
Copper Solvent Extraction ◽  
Average Size

Effects of extraction-stripping loops of organic phase on organic chemical entrainment in the aqueous raffinate in copper solvent extraction were studied in this paper. Results demonstrated that the total amount of organic chemicals lost in the aqueous raffinate decreased with the increase of times of extraction-stripping loops but reached largest at third loop. Entrainment was the dominate way of organic chemicals losing in the aqueous raffinate at early stage of the loops. The formation of entrainment and its stabilization mechanism was also studied. The average size of entrained droplet trended to increase with extraction-stripping loops increasing. Meanwhile, the absolute value of zeta potential trended to decrease. The surface tension of the aqueous raffinate increased after reaching the minimum value 41.3 mN/m at the 3rd loop. It showed that the formation of entrained droplets and its stability were mainly affected by the surface tension of aqueous raffinate.

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