Silicone-based enteric CT contrast material
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example 1
[0186](Method 1) One percent of surfactant Tween 20 (Sigma-Aldrich) aqueous solution was prepared by dissolving 50 mg of Tween-20 in 4.95 g of distilled water. To this clear solution (in a 50-ml centrifuge tube) was added dropwise 15.0 g of silicon-based polymer (50 cSt@ 25° C., Fisher Scientific) during moderate vortexing, through a 20-ml syringe attached with a 23G needle. After completion of the addition, the mixture was vigorously vortexed at room temperature for 3 minutes, giving a 75 wt % oil-in-water (o / w) type emulsion with 0.25wt % of Tween 20 surfactant (Note: tiny air bubbles are not avoidable in non-vacuum preparation conditions). This emulsion was measured to give the average particle size as 60 microns on a Malvern 3000 ZetaSizer. The emulsion can be stably stored at room temperature without phase separation for at least 3 months. CT scan proved its homogeneity (except the existence of tiny air bubbles).
[0187](Method 2) One percent of surfactant Tween-20 (Sigma-Aldrich...
example 2
[0190]The procedure of Example 1 was followed using Triton X-100.
example 3
[0191]The procedure of Example 1 was followed using Triton X-100 and a fluorinated silicon-based polymer FS-1265 (viscosity 350 cSt, Dow Corning).
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