Choosing the right syringe sets a ceiling on how accurate a measurement can be. Whether a given measurement reaches that ceiling is decided by handling. Below 10 µL a bubble or a film of liquid left in the barrel is a large fraction of the volume being measured, so the steps below are not refinements — they are the difference between the rated tolerance and the result you actually get.
Pre-wet the barrel before the first reading
To minimize systematic error, pre-wet the syringe by aspirating and dispensing the solvent several times before taking a measurement. This reduces surface tension effects and eliminates air bubbles that can skew the readout. Before each use, expel any trapped air and pre-wet the barrel with the same solvent to minimize adsorption and volume shifts.
Hold the temperature steady
Perform all measurements at a stable room temperature, as temperature shifts can alter both liquid density and syringe dimensions. This matters most with plastic barrels, which may expand slightly as the room warms.
Clean and store the syringe between uses
Store syringes in a clean, dry environment away from direct sunlight and extreme temperatures. If you reuse a syringe, clean it according to the solvent compatibility chart and verify that the plunger moves smoothly before the next measurement. Store the syringe vertically in a dust-free container.
Inspect and re-calibrate on a schedule
Regular maintenance is essential for continued precision. Inspect the plunger and barrel for scratches or wear, as these can affect accuracy over time, and clean the tip with an appropriate solvent. Periodically re-calibrate against a gravimetric standard to confirm that the syringe remains within specification.
For research use only. This guide covers bench handling of laboratory research materials. It does not describe an application, benefit, dose, route or outcome, and nothing in it is guidance for use in a person or an animal. Nothing sold by PepXtide has been evaluated by the FDA.