Videos
A protein crashed whole blood sample (0.2 mL with 0.3 mL acetonitrile) is aspirated and mixed inside the DPX-WAX tip. After approximately 30 seconds, a clean solution is dispensed into a vial and is ready for analysis.
DPX Labs is introducing a DPX Extractor that permits the simultaneous extraction of 24 samples. This semi-autosampler uses no electricity and performs the extractions with gas pressure (such as compressed air). There is little to no maintenance required and it is easy to operate.
Using a multi-channel pipettor, you can remove ion suppression effects from 8 acetonitrile protein precipitated blood samples (serum, plasma or whole blood) in just seconds.
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.
This video shows a rapid "cleanup" method using a DPX-WAX (weak anion exchange sorbent) tip. An acetonitrile solution of protein precipitated whole blood is rapidly processed in 60 seconds by aspirating the solution into the DPX-WAX tip, mixing the solution with the sorbent by aspirating air, and then dispensing the "clean" solution back into the tube. Note the comparison of with and without "cleanup" at the end of the video.
Rapid cleanup of milk solution to remove proteins and sugars is shown in this video. A small volume of whole milk (100 uL) is pre-mixed with 400 uL 50% acetonitrile and water, and this solution is aspirated and mixed inside the DPX-WAX tip.
Rapid cleanup of a spinach solution is performed to remove chlorophyll from the extract. A solution of spinach extracted from acetonitrile (10 g spinach to 10 g acetonitrile) is aspirated and mixed inside the DPX-Qg tip.