An acetonitrile solution of spinach was prepared according to the QuEChERS procedure by shaking spinach with acetonitrile in a 1:1 ratio (10 g spinach with 10 mL acetonitrile). Then 1 mL of the acetonitrile solution was dispensed into 2 test tubes, one that is untreated and the other which is "cleaned up" by aspirating and dispensing the solution in and out of the DPX-Qg tip 3 times. Note the removal of the green pigment by the DPX-Qg tip, which contains "high quality" graphitized carbon black (GCB). This is a very new GCB material that is of the highest quality for removing plant pigment matrices, which may have deleterious effects on the GC inlet system.

Below you can see the removal process in action...