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Topotecan was loaded into large unilamellar vesicles using nigericin-generated pH gradient or with triethylammonium (TA) ion gradient. Despite that in both loading methods, the encapsulated counter ion was 5-sulfosalicylate (5ssa), the resultant formulations exhibited distinct properties. In NaCl-containing release buffer, vesicles prepared with nigericin/Na + system could release topotecan...
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