The high purity Bromelain with the activity of 50-140 × 104u / g were extracted from the pineapple fruit by means of ultra-fine filter in this paper .

本文用超滤法从菠萝果实中提取高纯度菠萝蛋白酶，其活力达50-140× 10~4u／g。

Conclusion On the basis of same test conditions the purge capability of complex electret ultra-fine fiber filter ( sample A ) was higher than the rest .

结论3种 过滤 网在相同测试条件下，复合驻机体 超细纤维 过滤 网（试样A）净化效果的优势较为明显。