一种以压力差为推动力，按粒径选择分离溶液中所含的微粒和大分子的膜分离操作。超过滤将液体混合物分成滤液和浓缩液两部分：滤液为溶液或在其中含有粒径较小的微粒的悬浮液；浓缩液中保留原料液中所有较大的微粒。
随后，用丹宁酶处理过的茶叶提取物要经过超过滤处理。
The tea extract which has been treated with tannase is subsequently subjected to an ultra-filtration treatment.
超过滤和葡聚糖凝胶g 200实验，显示了其分子量的范围和分布。
The ultrafiltration and chromatographic experiments on Sephadex G-200 showed the range and the distribution of molecular weight.
试验结果还表明，超过滤分离后水解液的感官指标明显优于未分离的水解原液。
These results suggest that sense index of fractionated hydrolysates is superior to that of the original hydrolysates.
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