Magdassi S, Toledano O, Zakay-Rhones Z
. Formation of novel colloidal immunoclusters by surface active antibodies.
J. Colloid Interface Sci.Journal of Colloid and Interface Science. 1995;175 (2) :435 - 9.Abstract
Surface active antibodies were formed by covalent attachment of hydrophobic groups to IgG mols. The modification was carried out at various degrees of attachment and various chain lengths. These modified antibodies spontaneously formed new colloidal micelle-like particles, immunoclusters, which were viewed with a transmission electron microscope and evaluated by light scattering. The size of the immunoclusters increased while either degree of attachment or chain-length were increased, and the biol. activity decreased with an increase of degree of modification. [on SciFinder(R)]
Magdassi S, Vinetsky Y
. Microencapsulation of O/W emulsions by formation of a protein-surfactant insoluble complex.
J. MicroencapsulationJournal of Microencapsulation. 1995;12 (5) :537 - 45.Abstract
A method for obtaining microcapsules of oil droplets by the formation of an insol. complex of protein-surfactant is described. The gelatin type A studied, which is pos. charged at the pH range studied, may form insol. and sol. complexes with sodium dodecyl sulfate (SDS), an anionic surfactant. The binding isotherms were studied and the specific molar ratios of SDS to gelatin, in which the insol. complex is formed, was detd. These specific ratios also led to the formation of microcapsules, in which the wall encapsulating the oil droplets, is composed of the insol. gelatin SDS complex. [on SciFinder(R)]
Levy N, Garti N, Magdassi S
. Flocculation of bentonite suspensions with cationic guar.
Colloids Surf., AColloids and Surfaces, A: Physicochemical and Engineering Aspects. 1995;97 (2) :91 - 9.Abstract
Cationic guar gums of varying molar mass and charge d. were synthesized and tested as flocculants for bentonite suspensions. The gums were fragmented using ammonium persulfate as a degrading agent, followed by pptn. of the products with ethanol. Cationic charge was added to the guar mol. by reacting it with 2,3-epoxypropyltrimethylammonium chloride. Flocculant performance was assessed by detg. the extent of polymer adsorption, by measuring both residual turbidities of the resulting supernatants and the changes in the particles' electrophoretic mobility (EM). Increasing the flocculant charge d. causes the optimal flocculation concn. (OFC), as well as the efficient flocculant concn. range, to be reduced. Above this range restabilization occurs. The OFC (for highly modified guar) is also the concn. at which the particles' EM is zero. It was found that decreasing the mol. wt. of the guar (at the same charge d.) increases the OFC and decreases the electrophoretic mobility of the clay particles in the overdose range. [on SciFinder(R)]