2007
DOI: 10.1021/jp073813j
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Dynamic Surface Elasticity of β-Casein Solutions during Adsorption

Abstract: The nonmonotonic kinetic dependencies of the dynamic elasticity of adsorbed and spread β-casein layers at the liquid-gas interface have been determined by the oscillating barrier method. While two local maxima in the surface elasticity versus concentration dependence are well documented in literature, these features have not been reported for kinetic curve. The surface elasticity in the time range of the second maximum depended on the β-casein bulk concentration and deviated from the elasticity of spread β-cas… Show more

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Cited by 61 publications
(48 citation statements)
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“…For the exible protein, the authors proposed that the maximum at about 40 mN m À1 occurred through the protein conformation transition from mostly train to mostly loops and tails also in agreement with the observation of Noskov et al for b-casein. 56 Beyond a pressure of 29 mN m À1 , the monolayer collapsed and protein molecules were squeezed into the sub-phase. In the case of lysozyme, the protein was initially adsorbed in a compact globular state, resembling the native bulk conformation, the elasticity increased with surface concentration and reached a maximum value close to 78 mN m À1 .…”
Section: Discussionmentioning
confidence: 99%
“…For the exible protein, the authors proposed that the maximum at about 40 mN m À1 occurred through the protein conformation transition from mostly train to mostly loops and tails also in agreement with the observation of Noskov et al for b-casein. 56 Beyond a pressure of 29 mN m À1 , the monolayer collapsed and protein molecules were squeezed into the sub-phase. In the case of lysozyme, the protein was initially adsorbed in a compact globular state, resembling the native bulk conformation, the elasticity increased with surface concentration and reached a maximum value close to 78 mN m À1 .…”
Section: Discussionmentioning
confidence: 99%
“…The average hydrodynamic radius (R h ) of the free CM is about 13 nm, which is approximately equal to literature values. [18][19][20][21][22] Upon the addition of [C 12 mim]Br with concentration below c 1 , a small increase in R h has been observed (curve b in Fig. 3), which is caused by the binding of IL to b-CM.…”
Section: Microstructural Transition Of B-cm Induced By [C 12 Mim]brmentioning
confidence: 97%
“…It has been shown to exhibit properties benecial to food, cosmetic, bioengineering, and medical science. [17][18][19][20][21] b-Casein has been classied as an "intrinsically unstructured/disordered" protein (IUP). 22 The intrinsically unstructured/disordered regions are linked to a distinctive amino acid composition, characterized by a high content of proline.…”
Section: Introductionmentioning
confidence: 99%
“…Therefore, its adsorption dynamics, thermodynamics, and rheological behaviors are wellknown. [23][24][25] These molecules can be thought of as block copolymers consisting of blocks with high levels of hydrophobic or hydrophilic amino acid residues. Therefore, they exhibit a strong tendency of self-assembling into micellar structures.…”
Section: Introductionmentioning
confidence: 99%