<abstract xmlns="http://www.w3.org/1999/xhtml"> The evolutions of thinning of films from individual solutions of BSA, C12G2 and from their mixed solutions with molar ratios 1:1, 1:7.5, 1:50 and 1:100 with pH = 4.9 were recorded by modified (with video camera) interferometric method. Based on them the stages through which the film goes from its formation to the equilibrium state were distinguished. It was shown that: (i) the difference between the kinetic of drainage of films stabilized by high and low molecular surfactants is drastic; (ii) only the change of the pH solution under or above isoelectric point strongly retards the film drainage; (iii) the transition of the kinetic of thinning of films from mixed solutions from a kinetic typical for high molecular substances towards a kinetic for low substances depends on the molar ratio between the components in the solution. From the picture of film corresponding to its equilibrium state the type of film was determined. From the analysis of this picture the equilibrium thickness and contact angle were calculated. It was found that the criterion for Newtonium black films (based on the values of film thickness and contact angle) is not directly applicable for films from protein solutions or mixed solutions with the participation of proteins.</abstract>

The evolutions of thinning of films from individual solutions of BSA, C12G2 and from their mixed solutions with molar ratios 1:1, 1:7.5, 1:50 and 1:100 with pH = 4.9 were recorded by modified (with video camera) interferometric method. Based on them the stages through which the film goes from its formation to the equilibrium state were distinguished. It was shown that: (i) the difference between the kinetic of drainage of films stabilized by high and low molecular surfactants is drastic; (ii) only the change of the pH solution under or above isoelectric point strongly retards the film drainage; (iii) the transition of the kinetic of thinning of films from mixed solutions from a kinetic typical for high molecular substances towards a kinetic for low substances depends on the molar ratio between the components in the solution. From the picture of film corresponding to its equilibrium state the type of film was determined. From the analysis of this picture the equilibrium thickness and contact angle were calculated. It was found that the criterion for Newtonium black films (based on the values of film thickness and contact angle) is not directly applicable for films from protein solutions or mixed solutions with the participation of proteins.

Evolutions and equilibrium parameters of foam films from individual solutions of Bovine serum albumin, n-dodecyl-β-D-maltoside and from their mixed solutions

Faculty of Medicine, Medical University“Prof. Dr. P. Stoyanov” 84, Tzar Osvoboditel str., 9000, Varna,

Faculty of Natural Sciences, “K. Preslavsky” University of Shumen 115, Universitetska Str., 9712 Shumen,

Acta Scientifica Naturalis

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

The evolutions of thinning of films from individual solutions of BSA, C12G2 and from their mixed solutions with molar ratios 1:1, 1:7.5, 1:50 and 1:100 with pH...

Evolutions and equilibrium parameters of foam films from individual solutions of Bovine serum albumin, n-dodecyl-β-D-maltoside and from their mixed solutions

Published Online: Feb 09, 2017

Page range: 19 - 28

Received: Oct 30, 2016

Accepted: Jan 11, 2017

DOI: https://doi.org/10.1515/asn-2017-0004

Keywords
Bovine Serum Albumin (BSA), n-dodecyl - β -D maltoside (C12G2), mixed BSA/ C12G2 solutions, film evolution, equilibrium thickness, contact angle.

© 2017

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Evolutions and equilibrium parameters of foam films from individual solutions of Bovine serum albumin, n-dodecyl-β-D-maltoside and from their mixed solutions

Published Online: Feb 09, 2017

Page range: 19 - 28

Received: Oct 30, 2016

Accepted: Jan 11, 2017

DOI: https://doi.org/10.1515/asn-2017-0004

KeywordsBovine Serum Albumin (BSA), n-dodecyl - β -D maltoside (C12G2), mixed BSA/ C12G2 solutions, film evolution, equilibrium thickness, contact angle.

© 2017

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Keywords
Bovine Serum Albumin (BSA), n-dodecyl - β -D maltoside (C12G2), mixed BSA/ C12G2 solutions, film evolution, equilibrium thickness, contact angle.