microdialysis

https://doi.org/10.1351/goldbook.10283

Dialysis by a short length of hollow-fibre membrane used for sampling.

Note: Microdialysis is performed mostly in a living biological system.
Source:
PAC, 2016, 88, 517. (Glossary of terms used in extraction (IUPAC Recommendations 2016)) on page 550 [Terms] [Paper]