Revision as of 16:24, 17 December 2021

Adhesion test

The goal of today is to retry the make cells (HeLa) adhere in the chip. For that we will use fibronectin again to coat the surfaces of a newly made chip, with a careful plasma treatment.

What we did

First try

We try to use the chip that we molded last week but the channel collapsed upon bonding with the glass (Adam). So we will remake one (making some PDMS) and cure it over lunch time.

Second try

We poured PDMS into a new master, then put it in the oven at 70 degrees C over lunch to cure. However, the PDMS was not fully cured when we returned from our lunch-break. Miraculously, someone had previously made a fully cured PDMS-channel of 25 microns that we cut out and bonded onto the microscope slide to make a new microfluidic chip. This time the bonding was successful (Adam again). We filled the channel with a single drop of water in an effort to make the later injected fibronectin layer uniform. We then went to the bio-lab where we filled the channel with fibronectin (of unknown concentration; target concentration 2-10 mg cm^-2).

We detached the cells in a container using trypsin before incubating them. After taking the container out of the incubator, we used the usual passaging protocol to remove all the cells, without putting any back into the flask.

Moving on to the 420-lab, we injected the cells into the chip