Adsorption of proteins at the solution/air interface influenced by added nonionic surfactants at very low concentrations for both components. 3. dilational surface rheology

Fainerman, V. B ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.1021/acs.jpcb.5b00136
  3. Abstract:
  4. The influence of the addition of the nonionic surfactants C12DMPO, C14DMPO, C10OH, and C10EO5 at concentrations between 10-5 and 10-1 mmol/L to solutions of β-casein (BCS) and β-lactoglobulin (BLG) at a fixed concentration of 10-5 mmol/L on the dilational surface rheology is studied. A maximum in the viscoelasticity modulus |E| occurs at very low surfactant concentrations (10-4 to 10-3 mmol/L) for mixtures of BCS with C12DMPO and C14DMPO and for mixtures of BLG with C10EO5, while for mixture of BCS with C10EO5 the value of |E| only slightly increased. The |E| values calculated with a recently developed model, which assumes changes in the interfacial molar area of the protein molecules due to the interaction with the surfactants, are in satisfactory agreement with experimental data. A linear dependence exists between the ratio of the maximum modulus for the mixture to the modulus of the single protein solution and the coefficient reflecting the influence of the surfactants on the adsorption activity of the protein
  5. Keywords:
  6. Elasticity ; Mixtures ; Proteins ; Surface active agents ; Adsorption activity ; Adsorption of proteins ; Beta-lactoglobulin ; Dilational surface rheologies ; Linear dependence ; Low concentrations ; Protein molecules ; Surfactant concentrations ; Nonionic surfactants ; Surfactant ; Chemistry ; Flow kinetics ; Solution and solubility ; Adsorption ; Air ; Caseins ; Lactoglobulins ; Rheology ; Solutions ; Surface tension ; Surface-active agents
  7. Source: Journal of Physical Chemistry B ; Volume 119, Issue 9 , January , 2015 , Pages 3768-3775 ; 15206106 (ISSN)
  8. URL: http://pubs.acs.org/doi/abs/10.1021/acs.jpcb.5b00136