grapeseed oil?? not sure why you would need that to filter..
basically you just transfer your aas to another vial, the whatman filter filters out any unwanted particles...
#1) get a 10ml Syringe
#2) a 18g or 20g needle for drawing
#3) the whatman (.45u size i believe)
#4) get a 10ml *presealed vial*
#5) 20 or 22g needle for transferring.
#6) the same size needle for venting.
steps:
1) draw the the aas you want to transfer into the 10ml syringe.
2) remove needle when done drawing
3) screw whatman into the syringe
4) next, screw the 20-22g needle into the whatman.
5) inject "vent" needle of same size into the vial.
6) inject your 10ml syringe into the vial, then start pressing on the whatman and it will drip out your aas into the new vial
*u need vent needle to equalize pressure, as you put in liquid air will escape from the vent needle
*make sure the vent needle never touches the liquid or else the liquid will spray out of the vent needle.
* when you are finished injecting whatever amount, in the end there will be some left over solution on the whatman filter. you just have to draw some air and then start injecting the air and the solution will leave the whatman filter.