超滤（ｕｌｔｒａｆｉｌｔｒａｔｉｏｎ）是以多孔性半透膜为过滤介质，常温下依靠施压和流速，使提取液流经膜面而使高分子杂质被截留，达到除去杂质，提高药液澄明度的一种膜分离技术。与通常分离方法相比，超滤技术具有明显的特点和优点：不需加热，热敏性物质不易被破坏； Ultrafiltration (ultrafiltration) uses a porous semipermeable membrane as a filter medium, and the pressure and flow rate depend on the pressure and flow rate at room temperature, so that the extract fluid flows through the membrane surface and the polymer impurities are trapped to remove impurities and improve the clarity of the liquid medicine. Membrane separation technology. Compared with the usual separation method, ultrafiltration technology has obvious characteristics and advantages: without heating, heat-sensitive substances are not easily destroyed;