Loading Syringes to Inject into Microfluidics Device

freeman.lan

Published: 2023-12-30 DOI: 10.17504/protocols.io.e6nvwkxy2vmk/v1

Abstract

Protocol for loading syringes with small amounts of liquid sample for injection into droplet microfluidic devices.

Steps

Preparing Syringes

1.

Take out a syringe

Equipment

ValueLabel
Luer Lok Syringe (1mL)NAME
BD BiosciencesBRAND
309628SKU
https://www.bd.com/en-usLINK

Add 27g needle to the syringe

Equipment

ValueLabel
Precisionglide NeedleNAME
BDBRAND
301629SKU
https://www.bd.com/en-usLINK
2.

Use the needle and syringe to draw out approximately 200µL of

3.

Cut approximately 20 centimeters of with a razor and attach it to the needle tip.

Note
Cutting the tubing at an angle makes for easier insertion into microfluidic device downstream

Loading the Syringe

4.

Push the syringe so that the HFE7500 oil starts dripping at end of the tubing.

Note
Make sure to keep the syringe pointed up so that the air leaves the syringe first. There must be no air bubbles in the syringe or needle.

5.

Put the tube into the solution that you would like to load, and slowly draw the syringe to pull the solution into the tubing and syringe.

Note
Keep the syringe upright the whole time so that the oil remains on the bottom of the syringe.Ensure there are no air bubbles in the tubing - if there are, push syringe to clear the air bubbles then pull to draw again.

Interfacing with the Device

6.

Attach the loaded syringes to the syringe pumps

Note
You may have to keep the syringe pump and syringe upright to keep the oil on the bottom and the solution on top. This is only necessary for large volumes of sample solution

Equipment

ValueLabel
NE-300 Just Infusion™ Syringe PumpNAME
Automatic syringe pumpTYPE
New Era Pump Systems, Inc.BRAND
NE-300SKU
7.

Insert the other end of the tubing into the appropriate hole in the microfluidic device, using a tweezer or by hand.

8.

Set the appropriate syringe diameter and pump rates into the syringe pump and press start. You may want to begin the pumps with a higher pump rate in order to get the syringes to pressurize more quickly.

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