Viscosity of phospholipid sols

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Abstract
The viscosities of lysolecithin sols in water were found to be Newtonian at the concentrations investigated. A Couette viscometer was used. In the mixed sols containing both lysolecithin and lecithin, thixotropy was absent at all ratios and only the sol with a high lecithin fraction showed some non-Newtonian behaviour. The axial ratio of the mixed micelles calculated by the Simha method varies with the lecithin/lysolecithin ratio, rising to a maximum when the phospholipid mixture is of one mole lecithin to two moles lysolecithin. This phenomenon is probably due to the packing of the various hydrophobic groups in the micelle.

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