Polymers at Interfaces

Fleer, G. J.; Stuart, M.A. Cohen; Scheutjens, J.M.H.M.; Cosgrove, T.; Vincent, B.

doi:10.1007/978-94-011-2130-9

Cited by 461 publications

(745 citation statements)

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“…All data follow a single curve that is fairly independent of the rate of acidification. The finding that the adsorption takes place at pH 5.0, which is very close to the point of zero charge of the casein micelles, corroborates with the concept of electrosorption 15 being the driving force for pectin adsorption onto casein micelles.…”

Section: In Situ Dls Layer Thickness Measurementssupporting

confidence: 78%

“…One would expect a concentration of about 0.003 wt % to be sufficient when one assumes all pectin adsorbs and that the required adsorption is 1 mg/m 2 . 15 Assuming the value of 1 mg/m 2 , an accepted number that follows from polymer adsorption literature, 15 also applies to the pectin-casein micelle system, it seems that multilayers are required for stabilization. Probably, at 0.0075 wt % (partial) casein micelle aggregation takes place.…”

Section: In Situ Dls Layer Thickness Measurementsmentioning

confidence: 99%

“…The adsorbed amount does not seem to attain a certain plateau value. In general one finds for polymers a typical high affinity adsorption isotherm; 15 adding only a small amount of polymers leads to a maximum adsorption. Further, for the measured adsorption in model experiments most polymers reach a maximum adsorbed amount of about 1 mg/ m 2 .…”

Section: In Situ Dls Layer Thickness Measurementsmentioning

confidence: 99%

“…Further, for the measured adsorption in model experiments most polymers reach a maximum adsorbed amount of about 1 mg/ m 2 . 15 Usually, in such experiments multilayered adsorption does not take place, so there is "only" a "monolayer" that adsorbs. We estimate the amount of pectin, in m ads /m CM , for monolayer adsorption as follows: the total volume of casein micelles, V tot,CM , can be related to the total surface area of casein micelles, A tot,CM , in skim milk as where a is the average radius of a casein micelle.…”

Section: In Situ Dls Layer Thickness Measurementsmentioning

confidence: 99%

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Electrosorption of Pectin onto Casein Micelles

Tuinier¹,

Rolin²,

Kruif³

2002

Biomacromolecules

157

111

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Pectin, a polysaccharide derived from plant cells of fruit, is commonly used as stabilizer in acidified milk drinks. To gain a better understanding of the way that pectin stabilizes these drinks, we studied the adsorption and layer thickness of pectin on casein micelles in skim milk dispersions. Dynamic light scattering was used to measure the layer thickness of adsorbed pectin onto casein micelles in situ during acidification. The results indicate that the adsorption of pectin onto casein micelles is multilayered and takes place at and below pH 5.0. Renneting, i.e., cleaving-off κ-casein from the casein micelles, did not alter the adsorption pH. It did, however, show that pectin arrests the rennet-induced flocculation of casein micelles below pH 5.0. From the findings we concluded the attachment of pectin onto casein micelles is driven by electrosorption. Adsorption measurements confirmed the multilayered nature of the adsorption of pectin onto casein micelles. Both the adsorbed amount and the layer thickness increased with decreasing pH in the relevant range 3.5-5.0. The phase behavior of a casein micelles/pectin mixture was determined and could be explained in terms of thermodynamic incompatibility being relevant above pH 5.0 and adsorption, leading to either stabilization and bridging, being relevant below pH 5.0. The results confirm that electrosorption is the driving force for the adsorption of pectin onto casein micelles.

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Section: In Situ Dls Layer Thickness Measurementssupporting

confidence: 78%

Section: In Situ Dls Layer Thickness Measurementsmentioning

confidence: 99%

Section: In Situ Dls Layer Thickness Measurementsmentioning

confidence: 99%

Section: In Situ Dls Layer Thickness Measurementsmentioning

confidence: 99%

See 2 more Smart Citations

Electrosorption of Pectin onto Casein Micelles

Tuinier¹,

Rolin²,

Kruif³

2002

Biomacromolecules

157

111

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“…The performance of a polymer depends not only upon its adsorption density but also on its conformation and orientation at the interface. For an adsorbing polymer system, the balance of interaction energies between the polymer and solvent, the polymer and surface, and the polymer with itself will determine the final conformation adopted at the interface [6]. It is essential to have an adsorbed layer thickness that is sufficiently large to screen the Van der Waals attractive forces [7].…”

Section: Introductionmentioning

confidence: 99%

Interaction forces between particles stabilized by a hydrophobically modified inulin surfactant

Nestor

Esquena

Solans

et al. 2007

Journal of Colloid and Interface Science

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The adsorption isotherm of a hydrophobically modified inulin (INUTEC SP1) on Polystyrene (PS) and Poly(methyl methacrylate) (PMMA) particles was determined. The results show a high affinity isotherm for both particles as expected for a polymeric surfactant adsorption. The interactions forces between two layers of the hydrophobically modified inulin surfactant adsorbed onto a glass sphere and plate was determined using a modified atomic force microscope (AFM) apparatus. In the absence of any polymer, the interaction was attractive although the energy of interaction was lower than predicted by the van der Waals forces. The results between two layers of the adsorbed polymer confirms the adsorption isotherms results and provides an explanation to the high stability of the particles covered by INUTEC SP1 at high electrolyte concentration. Stability of dispersions against strong flocculation could be attributed to the conformation of the polymeric surfactant at the solid/liquid interface (multipoint attachment with several loops) which remains efficient at Na 2 SO 4 concentration reaching 1.5 mol.dm -3 . The thickness of the adsorbed polymer layer in water determined both by AFM and rheology measurements, was found to be about 9 nm.3

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Effect of polymer architecture on the miscibility of polymer/clay mixtures

Singh

Balazs

2000

Polym. Int.

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Polymers at Interfaces

Cited by 461 publications

References 0 publications

Electrosorption of Pectin onto Casein Micelles

Electrosorption of Pectin onto Casein Micelles

Interaction forces between particles stabilized by a hydrophobically modified inulin surfactant

Effect of polymer architecture on the miscibility of polymer/clay mixtures

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