Effect of gelatin and salts on the dynamic surface tension of manoxol OT

Kragh, A.M.

doi:10.1039/tf9646000225

Cited by 40 publications

(12 citation statements)

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“…Gelatin which is denatured collagen is a cheap and readily available polypeptide. Some of the earlier studies on gelatin-surfactant are those by Pankhurst, Knox and Wright, Kragh, and Shone . Kragh and Knox used surface-tension technique to study interactions above the IEP (iso electric point), whereas Knox and Wright studied precipitation phenomena in a gelatin−SDS system below the IEP using the turbidity method.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Light Scattering Study of Gelatin−Surfactant Interactions

1998

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Binding of anionic (sodium dodecyl sulfate, SDS), cationic (cetyl trimethyl ammonium bromide, CTAB), and nonionic (TX-100) surfactants to gelatin chains in aqueous buffer (pH = 7.0) medium has been studied by dynamic light-scattering technique performed at T = 30 °C. In the surfactant concentration range varying from 0 to 100 mM, SDS exhibited electrostatic binding to the charged groups of the polypeptide chain resulting in considerable reduction in the hydrodynamic radius (R h) of gelatin up to the critical association concentration (CAC), and at higher concentrations both the SDS micelles and gelatin−SDS complexes were found to be coexisting in equilibrium. In the case of CTAB, almost the opposite was observed: the gelatin chains showed small increase in size up to the CAC. Beyond this, the gelatin−CTAB complexes were observed to grow significantly, and these were found to be in equilibrium with CTAB micelles. TX-100 exhibited little hydrophobic binding to gelatin, and no observable change in gelatin size was observed. The micellar shapes were found to be near-spherical for SDS and oblate ellipsoidal for CTAB micelles. Results have been explained through the necklace-bead model of polymer−surfactant interactions.

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Section: Introductionmentioning

confidence: 99%

Dynamic Light Scattering Study of Gelatin−Surfactant Interactions

1998

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“…The formation of gelatin−surfactant complexes is particularly relevant in the latter application since surfactants are commonly incorporated into gelatin containing solutions to promote emulsification and to control surface tension during coating operations. The formation of complexes of gelatin and anionic surfactants has been studied by precipitate formation below the isoelectric point, , rheology, , surface tension, − equilibrium dialysis, , ion-selective electrode studies, film thickness, and 13 C NMR spectroscopy …”

Section: Introductionmentioning

confidence: 99%

Interaction between Gelatin and Anionic Surfactants

et al. 1996

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The effects of alkyl chain length of homologous alkyl sulfate surfactants ranging from C8 to C14 on the diffusion behavior of both the surfactant and gelatin have been investigated by pulsed-gradient spin-echo NMR spectroscopy. Changes in the diffusivity of the surfactant can be rationalized in terms of a two-state model consisting of gelatin-bound micelles in equilibrium with freely diffusing unimeric surfactant. A minimum in the diffusivity of gelatin is observed when the binding of surfactant amounts to about 1 micelle/strand. The depth of this minimum increases with the chain length of the surfactant. These effects are explained in terms of micelle-mediated transient cross-links as proposed by Greener et al. (Macromolecules 1987, 20, 2490). The effective strength of the cross-links is a decreasing function of the number of micelles/strand because of the electrostatic repulsion between the micelles; the strength increases with an increase in the size of the micelles.

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“…This study is also limited to effects above the IEP. Some of the earliest studies on gelatin-surfactant interactions are those by Pankhurst,11 Kragh,12 and Knox and co-workers. 13,14 In the studies of Kragh and Knox and Parshall, interactions above the IEP were investigated with surface tension techniques, whereas Knox and Wright studied precipitation phenomena in a gelatin-sodium dodecyl sulfate (S12S) system below the IEP using turbidimetric methods.…”

Section: Introductionmentioning

confidence: 99%