slightly better with the Sigma-Aldrich source of egg lecithin. In all cases, the sink condition caused the correlation coefficients to be lower at pH 7.4.

The soy lecithin models (Avanti) were tested most thoroughly at pH 7.4. Figure 7.61 shows the plot of r2 versus the amount of soy lecithin dissolved in dodecane, from 10% to 74% wt/vol, with and without acceptor sink condition. In the plot, the maximum r2 was achieved at about 20% wt/vol. The sink condition depressed the (dashed) curve by about 0.15 in r2 at pH 7.4. The 20% soy lecithin formulation was selected for all subsequent testing.

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