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制备供双重造影用的硫酸钡混悬剂所使用的表面活性剂应具有下述特点:性质稳定,遇酸、碱及在胃液中不产生凝聚或很少产生,防干扰性强,能降低硫酸钡粘度,分散性好或有助悬作用,和其它辅助剂配合可产生协同作用。通过筛选发现褐藻淀粉硫酸酯钠具有显著降低硫酸钡的粘度的特性,如用量为0.3%,即可降低粘度到18厘泊,用量一直增至0.7%,几乎无回升现象。用其配制复方硫酸钡混悬剂可配成60～
Surfactants used in the preparation of barium sulphate suspensions for dual contrast should have the following characteristics: stable in nature, in case of acid, alkali and in the gastric juice does not produce agglomeration or seldom produce strong anti-interference, can reduce sulfuric acid Barium viscosity, good dispersion or suspension, and other auxiliary agents can produce synergies. The result showed that the sodium sulfate of sodium alginate could significantly reduce the viscosity of barium sulphate. If the amount of sodium alginate was 0.3%, the viscosity could be reduced to 18 cps and the dosage increased to 0.7% with almost no recovery. With its preparation of compound barium sulfate suspension can be dubbed 60 ~